Publications by authors named "Song Mi Lee"

30 Publications

  • Page 1 of 1

The Effect of Oxygen Content in Binderless Cokes for High-Density Carbon Blocks from Coal Tar Pitch.

Materials (Basel) 2021 Apr 7;14(8). Epub 2021 Apr 7.

Fuel Cell Laboratory, Korea Institute of Energy Research (KIER), Daejeon 34129, Korea.

High-density carbon blocks are much lighter than metals and have excellent mechanical properties and are one of the materials garnering attention to replace existing metal parts. In this study, a binderless coke was produced by changing the flow rates of nitrogen and air as a carrier gas during heat treatment of coal tar pitch and using this, a green body was formed at 150 MPa and carbonized to produce a high-density carbon block. We express the binderless coke produced in this way by N10A0, N7A3, N5A5, N3A7, N0A10 according to the ratio of nitrogen and air, and in the case of carbon block, we have added CB in front of it. We then considered the effect of oxygen content in the binderless cokes on the optical, chemical, and mechanical properties. It was observed that the produced binderless cokes develop into a dense mosaic structure with a small particle size as the air flow rate increased. To survey the change in oxygen content of the produced binderless coke, O1s and C1s regions were measured using X-ray photoelectric spectroscopy (XPS), and O1s/C1s was calculated. The O1s/C1s ratio steadily increased as the air flow rate increased, and in the case of N0A10, it increased about twice as much as that of N10A0 to 11.20%. β-resin has a very large effect on the mechanical strength of the carbon block in addition to air in the pitch. And in the case of CB-N0A10, it shows the best mechanical strength with a density of 1.72 g/cm, bending strength of 87 MPa, and shore hardness of 93 HSD.
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http://dx.doi.org/10.3390/ma14081832DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8067829PMC
April 2021

Surface oxidation of petroleum pitch to improve mesopore ratio and specific surface area of activated carbon.

Sci Rep 2021 Jan 14;11(1):1460. Epub 2021 Jan 14.

Fuel Cell Laboratory, Korea Institute of Energy Research (KIER), Daejeon, 34129, Republic of Korea.

In this study, surface oxidation of petroleum pitch was performed to enhance the thermal stability, specific surface area, and mesopore ratio of activated carbon. The oxygen uptake of the pitch by surface oxidation has a strong influence on the formation of the specific surface area and pore size of activated carbon. It was confirmed that the oxygen uptake from the surface to the inner side of the surface oxidized pitch was the highest at the temperature of 330 °C (IP330-AC), with a mesopore ratio of 63.35% and specific surface area of 1811 m g. The oxygen content of the surface oxidized pitch increased proportionately with the mesopore ratio in activated carbon. The specific surface area and mesopore ratio of IP330-AC were respectively 163% and 487% higher than those of petroleum-based commercial activated carbon (A-BAC), and 102% and 491% higher than those of coconut-based commercial activated carbon (P60).
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http://dx.doi.org/10.1038/s41598-020-80784-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7809199PMC
January 2021

Effects of Intensive Individualized Nutrition Counseling on Nutritional Status and Kidney Function in Patients With Stage 3 and 4 Chronic Kidney Disease.

J Ren Nutr 2020 Dec 12. Epub 2020 Dec 12.

Department of Nutrition Care, Severance Hospital, Yonsei University Health System, Seoul, Korea. Electronic address:

Objective: Although dietary modification is a critical component of chronic kidney disease (CKD) management, compliance with dietary recommendations is often suboptimal. This prospective intervention study was conducted to evaluate the effects and adherence of intensive, individualized nutrition counseling in CKD patients from a single nation Asian ethnic group.

Methods: Patients with Stages 3 and 4 CKD were recruited from a tertiary hospital outpatient clinic in Korea. The intensive group received 3 monthly sessions of individualized intensive nutrition counseling. The control group received a one-time group program. The intensive group was compared with the control group at 3 months.

Results: A total of 59 patients were enrolled, and 42 (71.2%) completed the study (23/32 of the intensive group; 19/27 of the control group). The mean age of the patients was 64.7 ± 12.5 years, and 81% were male. The most common nutritional diagnosis was an excessive intake of sodium (Na, 97.6%), followed by potassium (K, 78.6%), protein (52.4%), and phosphorus (P, 31.0%). After 3 months of nutrition counseling, K and P intakes decreased significantly in both the intensive group (K, 2,760.9 ± 677.4 vs. 1,500.7 ± 398.5 mg/d, P < .001; P, 1,010.5 ± 247.4 vs. 631.3 ± 178.1 mg/d, P < .001) and the control group (K, 2,090.8 ± 765.3 vs. 1,703.9 ± 490.0 mg/d, P = .036; P, 807.2 ± 163.8 vs. 679.1 ± 175.9 mg/d, P = .044). Meanwhile, protein (68.3 ± 21.8 vs. 45.4 ± 10.1 g/d, P = .001), Na (4,009.8 ± 1,418.2 vs. 2,224.6 ± 759.8 mg/d, P < .001), and energy intakes (1,857.1 ± 411.5 vs. 1,273.7 ± 231.5 kcal, P < .001) decreased in the intensive group, but were comparable in the control group. Notably, BMI decreased (BMI, 25.4 ± 2.5 vs. 24.9 ± 2.9 kg/m2, P = .014) while eGFR (43.1 ± 11.8 vs. 48.9 ± 13.7 mL/min/1.73m2, P = .002) improved significantly in the intensive group only.

Conclusion: Intensive individualized nutrition counseling results in better adherence to dietary recommendations and improvement in kidney function in CKD patients.
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http://dx.doi.org/10.1053/j.jrn.2020.10.001DOI Listing
December 2020

Comparison of Hematological and Biochemical Results Derived from Arterial and Venous Blood Samples in Post-Anesthetic Dogs.

Animals (Basel) 2020 Nov 9;10(11). Epub 2020 Nov 9.

Department of Veterinary Clinical Sciences, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea.

Collecting blood from an indwelling arterial catheter may reduce stress from repeated venipuncture in patients requiring serial monitoring, but the use of arterial blood for hematological and biochemical testing remains understudied. Here, we compared hematological and biochemical results of arterial and venous blood and evaluated their clinical interchangeability. Blood samples from dogs who had recovered from anesthesia, collected by both arterial catheterization and venipuncture, were analyzed. To assess clinical acceptance between paired samples, the limit of agreement between the values derived from the arterial and venous blood samples was compared with the allowable total error (TEa) recommended for each parameter. We found no significant differences between the arterial and venous sample results for red/white blood cell and platelet counts and hematocrit, blood urea nitrogen, phosphate, total protein, albumin, alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, gamma-glutamyl transpeptidase, total bilirubin, sodium, potassium, and chloride levels, whereas hemoglobin, glucose, creatinine, and calcium levels differed significantly ( < 0.05). Moreover, only gamma-glutamyl transpeptidase and potassium exceeded the recommended TEa. Hematological and biochemical results derived from venous and arterial blood samples are clinically interchangeable in post-anesthetic dogs, with the exception of gamma-glutamyl transpeptidase and potassium; thus, these values should be used with caution.
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http://dx.doi.org/10.3390/ani10112069DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7695303PMC
November 2020

Comparison of the Effects of Liraglutide on Islet Graft Survival Between Local and Systemic Delivery.

Cell Transplant 2020 Jan-Dec;29:963689720971245

College of Pharmacy and Gachon Institute Pharmaceutical Science, Gachon University, Yeonsu-gu, Incheon, Korea.

Islet transplantation has emerged as a promising treatment for type 1 diabetes mellitus. Liraglutide, a glucagon-like peptide-1 (GLP-1) receptor agonist, protects beta cells after islet transplantation by improving glycemic control through several mechanisms. In this study, we compared the effects of local pretreatment and systemic treatment with liraglutide on islet transplantation in a diabetic mouse model. Streptozotocin (STZ)-induced diabetic C57BL/6 mice were transplanted with syngeneic islets under the kidney capsule. Isolated islets were either locally treated with liraglutide before transplantation or mice were treated systemically by intraperitoneal injection after islet transplantation. Local pretreatment of islets with liraglutide was more effective in increasing body weight, decreasing hemoglobin A1c levels, and lowering blood glucose levels in STZ-diabetic mice transplanted with islets. Local pretreatment was also more effective in increasing insulin secretion and islet survival in STZ-diabetic mice. Histological analysis of the transplantation site revealed fewer apoptotic cells following local pretreatment compared with systemic injection of liraglutide. These findings indicate that liraglutide administered once locally before transplantation might have superior effects on islet preservation than systemic administration.
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http://dx.doi.org/10.1177/0963689720971245DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7784585PMC
July 2021

Postoperative serum metabolites of patients on a low carbohydrate ketogenic diet after pancreatectomy for pancreatobiliary cancer: a nontargeted metabolomics pilot study.

Sci Rep 2019 11 14;9(1):16820. Epub 2019 Nov 14.

Department of Food and Nutrition, BK21 PLUS Project, College of Human Ecology, Yonsei University, Seoul, 03722, Korea.

A ketogenic diet is a potential adjuvant cancer therapy that limits glucose availability to tumours while fuelling normal tissues with ketone bodies. We examined the effect of a low carbohydrate ketogenic diet (LCKD) (80% kcal from fat, ketogenic ratio 1.75:1, w/w) compared to a general hospital diet (GD) on serum metabolic profiles in patients (n = 18, ≥ 19 years old) who underwent pancreatectomy for pancreatobiliary cancer. Serum samples collected preoperatively (week 0) and after the dietary intervention (week 2) were analysed with a nontargeted metabolomics approach using liquid chromatography-tandem mass spectrometry. Serum β-hydroxybutyrate and total ketone levels significantly increased after 2 weeks of LCKD compared to GD (p < 0.05). Principal component analysis score plots and orthogonal partial least squares discriminant analysis also showed significant differences between groups at week 2, with strong validation. In all, 240 metabolites differed between LCKD and GD. Pathways including glycerophospholipid and sphingolipid metabolisms were significantly enriched in the LCKD samples. LCKD decreased C22:1-ceramide levels, which are reported to be high in pancreatic cancer, while increasing lysophosphatidylcholine (18:2), uric acid, citrulline, and inosine levels, which are generally low in pancreatic cancer. Postoperative LCKD might beneficially modulate pancreatic cancer-related metabolites in patients with pancreatobiliary cancer.
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http://dx.doi.org/10.1038/s41598-019-53287-yDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6856065PMC
November 2019

Nutritional Intervention of a Pediatric Patient with Congenital Bronchomalacia and Gastroesophageal Reflux Disease: a Case Report.

Clin Nutr Res 2019 Oct 28;8(4):329-335. Epub 2019 Oct 28.

Department of Nutrition Care, Severance Hospital, Yonsei University Health System, Seoul 03772, Korea.

Gastroesophageal reflux disease (GERD) is closely related to respiratory issues. We reported the case about the nutrition intervention given to a male infant with congenital bronchomalacia, GERD, and recurrent pneumonia. During the first and second pediatric intensive care unit (PICU) stays, his nutrition status and nutrient intake were good. However, during the 18 days of the third PICU admission, his nutrient intake decreased to 75%-80% of his estimated calorie requirement and his Z-score for weight-for-age dropped to -1.4. We conducted nutritional interventions to improve GERD symptoms and nutritional status include avoiding overfeeding by feeding small amounts frequently, using a pre-thickened formula mixed with a high-calorie formula, and feeding through transpyloric tube. As a result, his daily nutrient intakes gradually increased and his Z-score for weight-for-age was normal. In conclusion, it is important to implement individualized intensive nutritional management to ensure adequate nutrition and growth status in infants with lung disease and GERD.
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http://dx.doi.org/10.7762/cnr.2019.8.4.329DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6826054PMC
October 2019

The Effect of Nutrition Intervention with Oral Nutritional Supplements on Pancreatic and Bile Duct Cancer Patients Undergoing Chemotherapy.

Nutrients 2019 May 22;11(5). Epub 2019 May 22.

Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul 03722, Korea.

Chemotherapy may negatively affect nutritional status and quality of life (QOL) in pancreatic cancer patients. Our aim was to investigate the beneficial effects of oral nutrition supplements (ONS) on pancreatic and bile duct cancer patients undergoing chemotherapy. Among patients with progressive pancreatic and bile duct cancer receiving chemotherapy, the ONS group ( = 15) received two packs of ONS daily for 8 weeks while the non-ONS group ( = 19) did not. Anthropometric measures, dietary intake, nutritional status, and quality of life were assessed. ONS significantly increased daily intakes of energy, carbohydrates, proteins, and lipids at 8 weeks compared to the baseline. After 8 weeks, fat mass significantly increased in the ONS group. For patients in their first cycle of chemotherapy, body weight, fat-free mass, skeletal muscle mass, body cell mass, and fat mass increased in the ONS group but decreased in the non-ONS group. Fat mass increased in second or higher cycle only in the ONS group. Patient-generated subjective global assessments (PG-SGA) and fatigue scores in the Quality of Life Questionnaire Core 30 (QLQ-C30) improved in the ONS group. ONS might improve nutritional status by increasing fat mass and/or maintaining the body composition of pancreatic and bile duct cancer patients with chemotherapy, especially those in the first cycle, and alleviate fatigue symptoms.
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http://dx.doi.org/10.3390/nu11051145DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6566877PMC
May 2019

Potential Nutritional and Metabolomic Advantages of High Fat Oral Supplementation in Pancreatectomized Pancreaticobiliary Cancer Patients.

Nutrients 2019 Apr 20;11(4). Epub 2019 Apr 20.

Department of Food and Nutrition, Brain Korea 21 Plus Project, College of Human Ecology, Yonsei University, 03722 Seoul, South Korea.

We examined the effect of high fat oral nutritional supplement (HFS) on the nutritional status, oral intake, and serum metabolites of postoperative pancreaticobiliary cancer patients. Pancreaticobiliary cancer patients were voluntarily recruited. The HFS group received postoperative oral high fat supplementation (80% of total calories from fat; = 12) until discharge; the control group (non-HFS; = 9) received none. Dietary intake, anthropometry, blood chemistry, nutritional risk index (NRI), and serum metabolites analyzed by liquid chromatography tandem mass spectrometry were evaluated. Overall, cumulative caloric supply via parental and oral/enteral routes were not different between groups. However, oral fat intake, caloric intake, and NRI scores of the HFS group were higher than those of the non-HFS group with increased oral meal consumption. Oral caloric, fat, and meal intakes correlated with NRI scores. Metabolomics analysis identified 195 serum metabolites pre-discharge. Oral fat intake was correlated with 42 metabolites relevant to the glycerophospholipid pathway. Oral high fat-specific upregulation of sphingomyelin (d18:1/24:1), a previously reported pancreatic cancer-downregulated metabolite, and lysophosphatidylcholine (16:0) were associated with NRI scores. Provision of HFS in postoperative pancreatic cancer patients may facilitate the recovery of postoperative health status by increasing oral meal intake, improving nutritional status, and modulating serum metabolites.
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http://dx.doi.org/10.3390/nu11040893DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6521063PMC
April 2019

The Potential Use of a Ketogenic Diet in Pancreatobiliary Cancer Patients After Pancreatectomy.

Anticancer Res 2018 Nov;38(11):6519-6527

Department of Nutrition Care, Severance Hospital, Yonsei University Health System, Seoul, Republic of Korea

Background/aim: High-carbohydrate diets are generally provided to post-pancreatectomy cancer patients. Low energy density of this diet may obstruct proper energy intake and recovery. This study aimed to assess the effects of high-fat, high-energy ketogenic diet (KD) in these patients.

Patients And Methods: After pancreatectomy, 9 patients were provided with general diet (GD) while 10 were served KD. Meal compliance, energy intake rate, meal satisfaction and presence of complications were monitored throughout hospital stay. Data on nutritional status, serum lipids and body composition were collected and compared between groups.

Results: Meal compliance, energy intake rate and meal satisfaction score were higher in KD. There were no differences in complications, nutritional status and serum lipids. The decrease in body cell mass (BCM) was greater in GD.

Conclusion: Post-pancreatectomy cancer patients who consumed KD had a higher energy intake and BCM. These results suggest the potential use of KD as an adjuvant anti-cancer therapy.
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http://dx.doi.org/10.21873/anticanres.13017DOI Listing
November 2018

International hospital accreditation and clinical nutrition service in acute care hospitals in South Korea: results of a nationwide cross-sectional survey.

Asia Pac J Clin Nutr 2018;27(1):158-166

Deptartment of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University, Yongin, Republic of Korea.

Background And Objectives: Beginning in 2007, 29 hospitals in South Korea have received accreditation from Joint Commission International (JCI). The present study aimed to identify differences in clinical nutrition service provisions between JCI accredited acute care hospitals and non-accredited acute care hospitals. A survey questionnaire was sent to all 43 acute care hospitals in South Korea.

Methods: A total of 35 sets of clinical nutrition service surveys, 234 sets of clinical dietitian job satisfaction surveys, and five-day daily work logs from 129 clinical dietitians were received. We used Fisher's exact test and independent t-test to analyze differences between acute care hospitals based on JCI accreditation.

Study Design: Nationwide cross-sectional survey.

Results: JCI accredited acute care hospitals (N=8) showed a higher, but not significantly higher, nutritional intervention rate of 12.7% among malnourished patients, compared with 7.0% in non-JCI accredited acute care hospitals (N=27). Analysis of work hours of clinical dietitians indicated time spent on direct care was higher (p<0.05), while time spent on outpatient care was lower (p<0.05) among JCI accredited acute care hospitals relative to non-JCI accredited acute care hospitals.

Conclusions: Accreditation from JCI has a positive influence in the advancement of not only the hospital services, but also clinical nutrition services.
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http://dx.doi.org/10.6133/apjcn.032017.25DOI Listing
September 2019

Effect of Personalized Nutritional Counseling on the Nutritional Status of Hemodialysis Patients.

Clin Nutr Res 2017 Oct 30;6(4):285-295. Epub 2017 Oct 30.

Department of Nutrition Care, Severance Hospital, Yonsei University College of Medicine, Seoul 03722, Korea.

This study set out to evaluate the impact of personalized nutritional counseling (PNC) on the nutritional status of hemodialysis (HD) patients. This was an intervention study for 10 months at 2 hospitals. Anthropometric, biochemical, dietary, and body composition parameters were measured at baseline and after 3 and 6 months of PNC. A total of 42 patients (23 men and 19 women) were included. Intake of dietary protein, serum albumin, and cholesterol levels had increased significantly from baseline to month 6 (p < 0.05). Among the bioelectrical impedance analysis (BIA) parameters, both the body cell mass (BCM) and the fat free mass (FFM) had significantly reduced at month 3 compared to baseline (p < 0.05). However, there was no difference between baseline and month 6. We assessed the nutritional status of the subjects using the malnutrition inflammation score (MIS), and divided them into an adequately nourished (AN) and a malnourished (MN) group at baseline. In the subgroup analysis, serum levels of albumin and cholesterol had increased significantly, particularly from baseline to month 6 in the MN group (p < 0.05). This study suggests that consecutive PNC contributed to the improvement of the protein intake, serum levels of albumin, cholesterol and to the delay of muscle wasting, which could also have a positive impact on the nutritional status, particularly in malnourished patients receiving HD treatment.
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http://dx.doi.org/10.7762/cnr.2017.6.4.285DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5665750PMC
October 2017

Induced dipole in vanadium-doped zinc oxide nanosheets and its effects on photoelectrochemical water splitting.

Nanotechnology 2017 Sep 19;28(39):395403. Epub 2017 Jul 19.

Department of Applied Chemistry, Kyung Hee University, Yongin, Gyeonggi, 17104, Republic of Korea.

Appropriate control of energy band bending at the interface between semiconductors and electrolytes are closely related to performance of photoelectrochemical (PEC) water splitting. Dipoles formed near the surface of semiconductors induces energy band bending at the interface. Energy band bending control has been demonstrated by employing charged molecules and piezoelectric materials. However, chemical and piezoelectric approaches have demerit of chemical instability and inducement of instantaneous dipole, respectively. To overcome these problems, we adopted the ferroelectric material for PEC water splitting, where spontaneous dipoles in the material can be oriented by applying external electric field. In this work, we hydrothermally synthesized vanadium (V)-doped ferroelectric ZnO nanosheets and employed to systematically investigate the dipole effect on performance of V-doped ZnO PEC for water oxidation. Consequently, positively polarized V-doped ZnO photoanode exhibits 125% enhanced water splitting efficiency compared to negatively polarized ones due to favorable band bending for carrier transport from semiconductor to water.
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http://dx.doi.org/10.1088/1361-6528/aa80aeDOI Listing
September 2017

A Case Report of the Nutrition Support for a Patient with HELLP Syndrome.

Clin Nutr Res 2017 Apr 18;6(2):136-144. Epub 2017 Apr 18.

Department of Nutrition Care, Severance Hospital, Yonsei University College of Medicine, Seoul 03722, Korea.

A 30-year-old female patient, 18 weeks gestational age, with no prior medical history was admitted to hospital complaining severe right upper quadrant pain. The patient was admitted to intensive care unit (ICU) after emergency surgery to treat intraperitoneal hemorrhage caused by rupture of liver hematoma. Despite the absence of high blood pressure, the patient was diagnosed with hemolysis, elevated liver enzymes, and low platelet count (HELLP) syndrome on the basis of abnormal levels of blood aspartate aminotransferase/alanine aminotransferase, lactate dehydrogenase, total bilirubin, direct bilirubin, C-reactive protein (CRP) and platelet along with liver damage and proteinuria. While in ICU, the patient was given total parenteral nutrition (TPN) and enteral nutrition (EN) for -20 days because oral feeding was impractical. In the early stage, TPN supply was not sufficient to meet the elevated nutritional demand induced by disease and surgery. Nevertheless, continuous care of nutrition support team enabled satisfactory EN and, subsequently, oral feeding which led to improvement in patient outcome.
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http://dx.doi.org/10.7762/cnr.2017.6.2.136DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5426206PMC
April 2017

Inhibition of lysophosphatidic acid receptor ameliorates Sjögren's syndrome in NOD mice.

Oncotarget 2017 Apr;8(16):27240-27251

Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon, Republic of Korea.

Lysophosphatidic acid (LPA), a bioactive lysophospholipid, is involved in the pathogenesis of chronic inflammatory and autoimmune diseases. In this study, we investigated the role of LPA/LPA receptor (LPAR) signaling in the pathogenesis of Sjögren's syndrome (SS). We found that autotaxin, an LPA producing enzyme, and LPAR1 and LPAR3 mRNA, and IL-17 mRNA were highly expressed in the exocrine glands of 20-week-old nonobese diabetic (NOD) mice, which show SS symptoms at this age, as compared with non-symptomatic 8-week-old NOD mice. In an adoptive transfer model using NOD lymphocytes, treatment with Ki16425, an LPAR1/3 antagonist, restored tear and saliva secretion and decreased symptoms of SS compared with the vehicle-treated group. IL-17 levels in serum and lacrimal glands were also significantly reduced by Ki16425 in recipient mice. In addition, Ki16425 treatment of 20-week-old NOD mice, which spontaneously developed SS, restored saliva volume. Treatment of NOD splenocytes with LPA induced the expression of IL-17 in a dose-dependent manner, and Ki16425 inhibited this increase. LPA stimulated the activation of ROCK2 and p38 MAPK; and inhibition of ROCK2 or p38 MAPK suppressed LPA-induced IL-17 expression. Our data suggest that LPAR signaling stimulates SS development by induction of IL-17 production via ROCK and p38 MAPK pathways. Thus, LPAR inhibition could be a possible therapeutic strategy for SS.
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http://dx.doi.org/10.18632/oncotarget.15916DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5432331PMC
April 2017

A Study on the Dietary Intake and the Nutritional Status among the Pancreatic Cancer Surgical Patients.

Clin Nutr Res 2016 Oct 31;5(4):279-289. Epub 2016 Oct 31.

Department of Nutritional Science and Food Management, Ewha Womans University, Seoul 03760, Korea .

The adequate dietary intake is important to maintain the nutritional status of the patients after pancreatic cancer surgery. This prospective study was designed to investigate the dietary intake and the nutritional status of the patients who had pancreatic cancer surgery. Thirty-one patients (15 men, 16 women) were enrolled and measured body weight, body mass index (BMI), nutritional risk index (NRI), and Malnutrition Universal Screening Tool (MUST). Actual oral intake with nutritional impact symptoms recorded on the clinical research foam at every meal and medical information were collected from electronic medical charts. The rates of malnutrition at admission were 45.1% (14/31) and 28.9% (9/31) by NRI and MUST method, respectively, but those were increased to 87% (27/31) and 86.6% (26/31) after operation on discharge. The median values of daily intake of energy, carbohydrates, fat, and protein were 588.1 kcal, 96.0 g, 11.8 g, and 27.0 g, respectively. Most patients (n = 20, 64.5%) experienced two or more symptoms such as anorexia, abdominal bloating and early satiety. There were negative correlations between C-reactive protein (CRP) levels and the intake of total energy, protein, fat, and zinc. The rates of malnutrition were increased sharply after surgery and the dietary intake also influenced the inflammatory indicators. The results suggested that need of considering special therapeutic diets for the patients who received pancreatic surgery.
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http://dx.doi.org/10.7762/cnr.2016.5.4.279DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5093225PMC
October 2016

Impact of T-cell-specific Smad4 deficiency on the development of autoimmune diabetes in NOD mice.

Immunol Cell Biol 2017 03 30;95(3):287-296. Epub 2016 Sep 30.

The Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon, Korea.

Type 1 diabetes results from autoimmune-mediated pancreatic beta-cell destruction and transforming growth factor-beta (TGF-β) is known to play a preventive role in type 1 diabetes in non-obese diabetic (NOD) mice. In this study, we investigated the role of Smad4, a key molecule for Smad-dependent TGF-β signaling, in T cells of NOD mice in the pathogenesis of autoimmune diabetes. We generated T-cell-specific Smad4 knockout (Smad4 tKO) NOD mice and assessed the pathological and immunological changes. Smad4 tKO showed earlier onset and increased incidence of diabetes than wild type (WT) NOD mice. Pathological features such as insulitis, anti-glutamic acid decarboxylase auto-antibody levels and serum IFN-γ levels were significantly increased in Smad4 tKO compared with WT NOD mice. Proportion and number of activated/memory CD4 T cell were significantly increased in pancreatic lymph nodes of Smad4 tKO compared with WT NOD mice. However, the proportion and function of regulatory T cells was not different. Effector CD4 T cells from Smad4 tKO were more resistant to suppression by regulatory T cells than effector cells from WT NOD mice. The proliferative potential of effector T cells from Smad4 tKO was significantly elevated compared with WT NOD mice, and activation of sterol regulatory element binding protein-1c (SREBP-1c) in T cells of Smad4 tKO NOD mice was correlated with this proliferative activity. We conclude that Smad4 deletion in T cells of NOD mice accelerated the development of autoimmune diabetes and increased the incidence of the disease by dysregulation of T cell activation at least in part via SREBP-1c activation.
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http://dx.doi.org/10.1038/icb.2016.98DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5364321PMC
March 2017

Nutritional Status and Body Composition in Korean Myopathy Patients.

Clin Nutr Res 2016 Jan 29;5(1):43-54. Epub 2016 Jan 29.

Department of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University, Yongin, Kyunggi-do 17104, Korea.

In myopathy patients, fat mass increases as the disease progresses, while lean body mass decreases. The present study aimed to investigate the overall nutritional status of Korean myopathy patients through surveys of diet and dietary habits, bioelectrical impedance analysis (BIA), and biochemistry tests, as well as the examination of related factors, for the purpose of using such findings as a basis for improving the nutritional status in myopathy patients. The energy intake of all participants was found to be insufficient at only 44.5% of Dietary Reference Intakes for Koreans 2010 (KDRIs 2010), whereas protein intake was sufficient at 89.8% of KDRIs 2010. Dietary fiber intake was found to be 58.4% of sufficient dietary fiber intake for adults according to KDRIs 2010. Calcium intake was found to be 55.0% and magnesium was 14.9% of the recommended calcium and magnesium intake for adults according to KDRIs 2010. With respect to quality of life (QOL), overall increase in QOL domain score showed significant positive correlations with vegetable fat intake (p < 0.05), vegetable protein intake (p < 0.05), and dietary fiber intake (p < 0.05). With respect to BIA, the mean phage angle of all participants was found to be 2.49 ± 0.93°, which was below the cutoff value. As a study that examined nutrient analysis and dietary habits of myopathy patients in Korea, the present study is meaningful in providing the basic data for future studies that aim to present dietary guidelines for patients suffering from myopathy.
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http://dx.doi.org/10.7762/cnr.2016.5.1.43DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4731861PMC
January 2016

Comparison of hydration and nutritional status between young and elderly hemodialysis patients through bioimpedance analysis.

Clin Interv Aging 2015 13;10:1327-34. Epub 2015 Aug 13.

Severance Institute for Vascular and Metabolic Research, Yonsei University College of Medicine, Seoul, Korea ; Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.

Background: The number of elderly people on dialysis is increasing rapidly. Fluid overload and malnutrition status are serious problems in elderly dialysis patients. We aimed to compare the hydration and nutritional status through bioimpedance analysis (BIA) between young and elderly hemodialysis (HD) patients and to analyze risk factors related to fluid overload and malnutrition status in these patients.

Method: We conducted a cross-sectional study, in which 82 HD (males 42, mean age 58.7±12.9 years) patients were enrolled. We collected different types of data: laboratory data, such as serum creatinine, albumin, total iron-binding capacity, hemoglobin, total cholesterol; anthropometric data, such as hand grip strength (HGS); BIA data, such as intracellular water, skeletal muscle mass, body cell mass, bone mineral content, phase angle (PhA), extra cellular water (ECW)/total body water (TBW) ratio; and malnutrition-inflammation score (MIS), which is a traditional nutritional parameter for dialysis patients. All patients were stratified into two groups according to their age: young (<65 years [n=54]) and elderly (≥65 years [n=28]).

Results: Total iron-binding capacity and HGS were significantly lower in elderly HD patients than in young HD patients (198.9±35.6 vs 221.4±52.1 mcg/dL; and 22.4±10.3 vs 36.4±23.2 kg, respectively) (P<0.05). Also, intracellular water and PhA measured by BIA were significantly lower (18.3±4.0 vs 20.3±4.2 L [P=0.043]; and 4.0±1.0 vs 4.9±1.2° [P=0.002], respectively), and ECW/TBW were higher in elderly HD patients (0.40±0.01 vs 0.39±0.01 [P=0.001]). ECW/TBW was positively associated with age (P<0.001) and the presence of diabetes (P<0.001) and was negatively associated with sex (P=0.001), albumin (P<0.001), urine volume (P=0.042), HGS (P<0.001), and PhA by BIA (P<0.001). MIS was negatively related to sex (P=0.001), albumin (P<0.001), HGS (P=0.001), and PhA (P<0.001) in HD patients. On multivariate analysis, older age (P=0.031), the presence of diabetes (P=0.035), and decreased PhA (P<0.001) were independent risk factors for increased ECW/TBW, representative of fluid overload status, whereas only decreased PhA (P=0.008) was a significant factor for MIS, representative of malnutrition status in these HD patients.

Conclusion: We found that fluid overload and malnutrition status were more common in elderly HD patients compared with young HD patients. PhA was a significant independent factor in fluid overload status and malnutrition in these HD patients. Thus, our results indicated that PhA assessed by BIA might be a clinically useful method for assessing nutritional and hydration status in elderly HD patients.
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http://dx.doi.org/10.2147/CIA.S86229DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4541557PMC
April 2016

Betacellulin ameliorates hyperglycemia in obese diabetic db/db mice.

J Mol Med (Berl) 2015 Nov 14;93(11):1235-45. Epub 2015 Jun 14.

Lee Gil Ya Cancer and Diabetes Institute, Gachon University, 7-45 Songdo-dong, Yeonsu-ku, Incheon, Korea.

Unlabelled: We found that administration of a recombinant adenovirus (rAd) expressing betacellulin (BTC) into obese diabetic db/db mice ameliorated hyperglycemia. Exogenous glucose clearance was significantly improved, and serum insulin levels were significantly higher in rAd-BTC-treated mice than rAd-β-gal-treated control mice. rAd-BTC treatment increased insulin/bromodeoxyuridine double-positive cells in the islets, and islets from rAd-BTC-treated mice exhibited a significant increase in the level of G1-S phase-related cyclins as compared with control mice. In addition, BTC treatment increased messenger RNA (mRNA) and protein levels of these cyclins and cyclin-dependent kinases in MIN-6 cells. BTC treatment induced intracellular Ca(2+) levels through phospholipase C-γ1 activation, and upregulated calcineurin B (CnB1) levels as well as calcineurin activity. Upregulation of CnB1 by BTC treatment was observed in isolated islet cells from db/db mice. When treated with CnB1 small interfering RNA (siRNA) in MIN-6 cells and isolated islets, induction of cell cycle regulators by BTC treatment was blocked and consequently reduced BTC-induced cell viability. As well as BTC's effects on cell survival and insulin secretion, our findings demonstrate a novel pathway by which BTC controls beta-cell regeneration in the obese diabetic condition by regulating G1-S phase cell cycle expression through Ca(2+) signaling pathways.

Key Messages: Administration of BTC to db/db mice results in amelioration of hyperglycemia. BTC stimulates beta-cell proliferation in db/db mice. Ca(2+) signaling was involved in BTC-induced beta-cell proliferation. BTC has an anti-apoptotic effect and potentiates glucose-stimulated insulin secretion.
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http://dx.doi.org/10.1007/s00109-015-1303-1DOI Listing
November 2015

Associations of colorectal cancer incidence with nutrient and food group intakes in korean adults: a case-control study.

Clin Nutr Res 2015 Apr 30;4(2):110-23. Epub 2015 Apr 30.

Department of Gastroenterology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul 135-720, Korea.

This study aimed to examine the associations between intakes of various nutrients and food groups and colorectal cancer risk in a case-control study among Koreans aged 20 to 80 years. A total of 150 new cases and 116 controls were recruited with subjects' informed consent. Dietary data were collected using the food frequency questionnaire developed and validated by the Korea Centers for Disease Control and Prevention. Multivariate logistic regression models were used to estimate odds ratios (ORs) and corresponding 95% confidence intervals (CIs) for colorectal cancer incidence. High intakes of total lipid (ORT3 vs T1 = 4.15, 95% CI: 1.33-12.96, p for trend = 0.034), saturated fatty acid (ORT3 vs T1 = 2.96, 95% CI: 1.24-7.04, p for trend = 0.016) and monounsaturated fatty acid (ORT3 vs T1 = 3.04, 95% CI: 1.23-7.54, p for trend = 0.018) were significantly associated with increased incidence of colorectal cancer. High dietary fiber (ORT3 vs T1 = 0.22, 95% CI: 0.08-0.56, p for trend = 0.002) and vitamin C (ORT3 vs T1 = 0.38, 95% CI: 0.14-1.05, p for trend = 0.021) intakes were significantly associated with reduced colorectal cancer incidence. From the food group analysis, bread (ORT3 vs T1 = 2.26, 95% CI: 0.96-5.33, p for trend = 0.031), red meat (ORT3 vs T1 = 7.33, 95% CI: 2.98-18.06, p for trend < 0.001), milk·dairy product (ORT3 vs T1 = 2.42, 95% CI: 1.10-5.31, p for trend = 0.071) and beverage (ORT3 vs T1 = 3.17, 95% CI: 1.35-7.48, p for trend = 0.002) intakes were positively associated with colorectal cancer risk. On the other hand, high intake of traditional rice cake (ORT3 vs T1 = 0.35, 95% CI: 0.14-0.86, p for trend = 0.024) was linked with lower colorectal cancer incidence. In conclusion, eating a diet high in total lipid, saturated fatty acids and monounsaturated fatty acids is associated with higher incidence of colorectal cancer, whereas a diet high in dietary fiber and vitamin C was found to lower the incidence in Korean adults. Interestingly high traditional rice cake consumption is associated inversely with colorectal cancer incidence, warranting a future study.
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http://dx.doi.org/10.7762/cnr.2015.4.2.110DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4418415PMC
April 2015

Development of job standards for clinical nutrition therapy for dyslipidemia patients.

Clin Nutr Res 2015 Apr 27;4(2):76-89. Epub 2015 Apr 27.

Department of Food and Nutrition, Wonkwang University, Iksan 570-749, Korea.

Dyslipidemia has significantly contributed to the increase of death and morbidity rates related to cardiovascular diseases. Clinical nutrition service provided by dietitians has been reported to have a positive effect on relief of medical symptoms or reducing the further medical costs. However, there is a lack of researches to identify key competencies and job standard for clinical dietitians to care patients with dyslipidemia. Therefore, the purpose of this study was to analyze the job components of clinical dietitian and develop the standard for professional practice to provide effective nutrition management for dyslipidemia patients. The current status of clinical nutrition therapy for dyslipidemia patients in hospitals with 300 or more beds was studied. After duty tasks and task elements of nutrition care process for dyslipidemia clinical dietitians were developed by developing a curriculum (DACUM) analysis method. The developed job standards were pretested in order to evaluate job performance, difficulty, and job standards. As a result, the job standard included four jobs, 18 tasks, and 53 task elements, and specific job description includes 73 basic services and 26 recommended services. When clinical dietitians managing dyslipidemia patients performed their practice according to this job standard for 30 patients the job performance rate was 68.3%. Therefore, the job standards of clinical dietitians for clinical nutrition service for dyslipidemia patients proposed in this study can be effectively used by hospitals.
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http://dx.doi.org/10.7762/cnr.2015.4.2.76DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4418419PMC
April 2015

Use of bioelectrical impedance analysis for the assessment of nutritional status in critically ill patients.

Clin Nutr Res 2015 Jan 23;4(1):32-40. Epub 2015 Jan 23.

Department of Nutrition Services, Gangnam Severance Hospital, Seoul 135-720, Korea.

Malnutrition is common in the critically ill patients and known to cause a variety of negative clinical outcomes. However, various conventional methods for nutrition assessment have several limitations. We hypothesized that body composition data, as measured using bioelectrical impedance analysis (BIA), may have a significant role in evaluating nutritional status and predicting clinical outcomes in critically ill patients. We gathered clinical, biochemical, and BIA data from 66 critically ill patients admitted to an intensive care unit. Patients were divided into three nutritional status groups according to their serum albumin level and total lymphocyte counts. The BIA results, conventional indicators of nutrition status, and clinical outcomes were compared and analyzed retrospectively. Results showed that the BIA indices including phase angle (PhA), extracellular water (ECW), and ECW/total body water (TBW) were significantly associated with the severity of nutritional status. Particularly, PhA, an indicator of the health of the cell membrane, was higher in the well-nourished patient group, whereas the edema index (ECW/TBW) was higher in the severely malnourished patient group. PhA was positively associated with albumin and ECW/TBW was negatively associated with serum albumin, hemoglobin, and duration of mechanical ventilation. In non-survivors, PhA was significantly lower and both ECW/TBW and %TBW/fat free mass were higher than in survivors. In conclusion, several BIA indexes including PhA and ECW/TBW may be useful for nutritional assessment and represent significant prognostic factors in the care of critically ill patients.
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http://dx.doi.org/10.7762/cnr.2015.4.1.32DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4337921PMC
January 2015

Intensive nutritional counseling improves PG-SGA scores and nutritional symptoms during and after radiotherapy in Korean cancer patients.

Support Care Cancer 2014 Nov 7;22(11):2997-3005. Epub 2014 Jun 7.

Department of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University, Yongin, 446-791, South Korea,

Purpose: This study was conducted for the nutritional assessment of cancer patients undergoing radiotherapy (RT) and to investigate the changes in nutrition status, oral intake, morbidity and quality of life (QOL) in cancer patients after intensive nutrition counseling.

Methods: Eighty-seven cancer patients were randomized to either a nutrition counseling group (n = 44, age 58.0 ± 2.2 years) or a control group (n = 43, 62.0 ± 1.8 years). Nutrition counseling accompanied RT, and the subjects received at least three sessions of individualized dietary counseling over the duration of RT. Assessment parameters were nutritional intake (24-h recall method), nutritional status Patient-Generated Subjective Global Assessment (PG-SGA), QOL and blood parameters including albumin. All parameters were measured at baseline, at the end of RT, and 1 month after the termination of RT.

Results: Body weight, body mass index (BMI), and energy and protein intake for the intervention and control groups did not differ significantly between baseline and the end of RT. However, at 1 month follow-up, protein intake was significantly decreased in the control group (p < 0.05). Blood albumin, total protein (TP), total lymphocyte count (TLC) were not different between the two groups. According to PG-SGA stage, at 1 month follow-up, patients in the intervention group showed increased number of patients with stage A status (well nourished). In addition, insomnia and nausea was significantly improved in the intervention group assessed by QOL.

Conclusion: We suggest that repetitive and intensive nutritional counseling is necessary to improve QOL and to prevent deterioration of nutritional status in cancer patients receiving RT.
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http://dx.doi.org/10.1007/s00520-014-2304-2DOI Listing
November 2014

Effect of 8-week nutrition counseling to increase phytochemical rich fruit and vegetable consumption in korean breast cancer patients: a randomized controlled trial.

Clin Nutr Res 2014 Jan 27;3(1):39-47. Epub 2014 Jan 27.

Department of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University, Yongin 446-701, Korea. ; Research Institute of Medical Nutrition, Kyung Hee University, Seoul 130-701, Korea.

High fruit and vegetable consumption is associated with a lower risk of breast cancer. The incidence of breast cancer is continuously increasing in Korea, but only a few studies on nutrition intervention in breast cancer patients has been reported. The aim of this study was to investigate whether an 8-week nutrition intervention based on dietary counseling can promote fruit and vegetable consumption, increase serum antioxidant nutrient levels, and improve quality of life in Korean breast cancer patients. Sixty-one breast cancer patients received either standard care (n = 31) or nutrition counseling (n = 30). The standard care group was given brochures recommending phytochemical rich diet. The intervention group was provided with two nutrition counseling sessions and one cooking class session, thereby encouraged subjects to eat at least 10 or more servings of fruits and vegetables per day. After 8-week intervention, waist circumference in the intervention group was significantly decreased (p < 0.001) even though no difference was reported for body mass index. Energy intake (p = 0.007), fiber (p < 0.001), and antioxidant nutrient (vitamin A, C, E, and β-carotene, p < 0.001, respectively) intakes were significantly increased. Serum antioxidant level was also increased significantly, i.e., vitamin A (p = 0.048); vitamin E (p = 0.004). Total vegetable intake (excluding kimchi intake) in the intervention group was increased from 425 g to 761 g (p < 0.001), fruit consumption was also increased from 232 g to 334 g (p < 0.001), while standard care group did not show any significant change. Our study showed that nutrition counseling and providing cooking tips helped to encourage the patient to consume and maintain more fruit and vegetable intakes.
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http://dx.doi.org/10.7762/cnr.2014.3.1.39DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3921294PMC
January 2014

Nutritional support process for a patient with short bowel syndrome in conjunction with panperitonitis: a case report.

Clin Nutr Res 2013 Jul 23;2(2):149-53. Epub 2013 Jul 23.

Department of Nutrition Services, Yonsei University College of Medicine, Gangnam Severance Hospital, Seoul 135-720, Korea.

Short Bowel Syndrome (SBS) is a condition that causes malabsorption and nutrient deficiency because a large section of the small intestine is missing or has been surgically removed. SBS may develop congenitally or from gastroenterectomy, which often change the motility, digestive, and/or absorptive functions of the small bowel. The surgical procedure for SBS and the condition itself have high mortality rates and often lead to a range of complications associated with long-term parenteral nutrition (PN). Therefore, careful management and appropriate nutrition intervention are needed to prevent complications and to help maintain the physiologic integrity of the remaining intestinal functions. Initial postoperative care should provide adequate hydration, electrolyte support and total parenteral nutrition (TPN) to prevent fatal dehydration. Simultaneously, enteral nutrition should be gradually introduced, with the final goal of using only enteral nutrition support and/or oral intake and eliminating TPN from the diet. A patient should be considered for discharge when macro and micronutrients can be adequately supplied through enteral nutrition support or oral diet. Currently, there is more research on pediatric patients with SBS than on adult patient population. A 35-year-old man with no notable medical history was hospitalized and underwent a surgery for acute appendicitis at a local hospital. He was re-operated on the 8th day after the initial surgery due to complications and was under observation when he suddenly complained of severe abdominal pain and high fever. He was immediately transferred to a tertiary hospital where the medical team discovered free air in the abdomen. He was subsequently diagnosed with panperitonitis and underwent an emergency reoperation to explore the abdomen. Although the patient was expected to be at a high risk of malnutrition due to short bowel syndrome resulting from multiple surgeries, through intensive care under close cooperation between the medical and nutrition support team, his nutritional status improved significantly through continuous central and peripheral parenteral nutrition, enteral nutrition, and oral intake. The purpose of this paper is to report the process of the patient's recovery.
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http://dx.doi.org/10.7762/cnr.2013.2.2.149DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3728465PMC
July 2013

Knowledge, Self-Efficacy, and Perceived Barriers on the Low-Iodine Diet among Thyroid Cancer Patients Preparing for Radioactive Iodine Therapy.

Clin Nutr Res 2012 Jul 26;1(1):13-22. Epub 2012 Jul 26.

Department of Food & Nutrition, Seoul Women's University, Seoul 139-774, Korea.

The purposes of the study were to assess knowledge, self-efficacy, and perceived barriers on a low-iodine diet among thyroid cancer patients and to identify strategies for nutrition education. A self-administered questionnaire was developed based on a review of literature and pilot-tested. A total of 121 female thyroid cancer patients participated in a survey and 117 responses were used for data analysis. An average knowledge score of the thyroid cancer patients was 4.5 point (available score: 0-10 point). Majority of the respondents knew that seaweeds such as lavers, brown seaweeds, and sea tangles contain large amount of iodine. However they mistook the low iodine diet as a low salt diet and were not aware of foods and seasonings that are allowed on the low iodine diet. While self-efficacy related to consuming various fruits and vegetables, to choosing potatoes and sweet potatoes for snacks, and restricting consumption of eggs, milk and milk products, and processed foods was rated highly, self-efficacy for preparing foods without using sea salts was rated low. The self-efficacy score increased as their interest on the dietary life and perceived cooking skills were greater. Most perceived barriers toward practicing the low iodine diet were related to preparation of the low iodine menus. As their interest in the dietary life and cooking and perceived cooking skills were greater, the patients perceived barriers on practicing the low iodine diet less. While the patients showed higher self-efficacy and lower barrier perception on selecting foods low in iodine and restricting food high in iodine, they showed lower self-efficacy and higher barrier perceptions on preparing low iodine meals. Clinical dietitians should recognize the gap between what the patients should know and what they really know and identify strategies on how to improve self-efficacy and reduce perceived barriers on the low iodine diet. Recent literature and the findings of the study reveal that incorporating cooking classes into nutrition education for thyroid patients is effective to enhance self-efficacy and to reduce perceived barriers on the low iodine diet.
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http://dx.doi.org/10.7762/cnr.2012.1.1.13DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3572801PMC
July 2012

Potent anti-inflammatory effects of two quinolinedione compounds, OQ1 and OQ21, mediated by dual inhibition of inducible NO synthase and cyclooxygenase-2.

Br J Pharmacol 2009 Jan 19;156(2):328-37. Epub 2009 Jan 19.

College of Pharmacy, Seoul National University, Shinrim-dong San 56-1, Seoul 151-742, Korea.

Background And Purpose: Inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) have been suggested as key components in various inflammatory diseases. Here we examined the effects of new quinolinedione derivatives, 6-(4-fluorophenyl)-amino-5,8-quinolinedione (OQ1) and 6-(2,3,4-trifluorophenyl)-amino-5,8-quinolinedione (OQ21) on activity and expression of iNOS and COX-2 to explore their anti-inflammatory properties.

Experimental Approach: The effects of OQ1 and OQ21 were assessed on lipopolysaccharide (LPS)-induced iNOS and COX-2 in murine macrophage cell line (RAW264.7), along with isolated enzyme assays to measure enzyme inhibition. Nuclear factor-kappaB (NFkappaB) activation pathways were investigated to elucidate mechanisms underlying OQ-mediated suppression of the expression of iNOS and COX-2. In vivo anti-inflammatory activities of OQ compounds were evaluated in mouse ear oedema, induced by topical 12-O-tetradecanoylphorbol-13-acetate (TPA).

Key Results: LPS-induced NO production in RAW264.7 cells was inhibited by OQ1 and OQ21 through the attenuation of iNOS expression as well as iNOS activity. Down-regulation of iNOS followed blocking of NFkappaB activation, as assessed by inhibitory kappaB degradation and electrophoretic mobility shift assay for NFkappaB. Synthesis and accumulation of prostaglandin E(2) were also suppressed by OQ1 and OQ21. LPS-induced COX-2 expression and cellular COX-2 activities were attenuated by OQ1 and OQ21. Consistent with these results, OQ1 showed potent anti-inflammatory effects in mouse ear oedema induced by TPA.

Conclusions And Implications: The novel quinolinedione derivatives, OQ1 and OQ21, showed potent anti-inflammatory activity through dual inhibitory effects on iNOS and COX-2, suggesting that OQ derivatives might provide a new therapeutic modality for chronic inflammatory diseases, refractory to conventional drug therapies.
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http://dx.doi.org/10.1111/j.1476-5381.2008.00028.xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2697840PMC
January 2009

Hepatitis C virus E2 links soluble human CD81 and SR-B1 protein.

Virus Res 2006 Oct 24;121(1):58-64. Epub 2006 May 24.

Laboratory of Immunology and the Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Shillim-Dong, Kwanak-Gu, 151-742, Korea.

Limited information is available regarding hepatitis C virus (HCV) entry events. Viral attachment and infection studies have been performed using HCV envelope glycoprotein (E2) and HCV pseudo-particle (HCVpp) models to obtain general information about the early entry events. However, the details involved in each step of viral entry into human cells are still obscure. This study provides molecular clue for the formation of a heteromultimeric complex as a possible post-attachment step. Among several putative receptors, human CD81 and scavenger receptor class B type 1 (SR-B1) have been demonstrated as considerable determinants in infectious outcome as well as attachment. In this study, we provide molecular evidence demonstrating that HCV E2 links soluble CD81 and SR-B1 protein together. This physical neighboring might explain why both CD81 and SR-B1 are indispensable factors for HCVpp infection. These data further elucidate our understanding of HCV entry and provide new insight into directing future studies identifying novel liver-specific fusion receptor(s).
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http://dx.doi.org/10.1016/j.virusres.2006.04.002DOI Listing
October 2006
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