Publications by authors named "Xiufa Sun"

37 Publications

Self-reported health problems related to traditional dietary practices in postpartum women from urban, suburban and rural areas of Hubei province, China: the 'zuò yuèzi'.

Asia Pac J Clin Nutr 2016 ;25(1):158-64

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science &Technology, Wuhan, PR China.

Background And Objectives: We aimed to investigate the prevalence of maternal health problems in the postpartum period and their association with traditional Chinese postpartum diets and behaviours in three selected regions in Hubei province, China.

Methods And Study Design: A cross-sectional study was conducted in urban, suburban and rural areas. A total of 2100 women who had given birth to full-term single infants in the past two years were enrolled. Their postpartum diet, personal behaviours, and health problems were surveyed by trained interviewers.

Results: During the puerperium women consumed plentiful eggs, fish, poultry and meats; however, fruit, vegetable and milk consumption were limited. A high prevalence of health problems potentially related to pregnancy and the puerperium were found. At least one such problem was reported by 59.3% of women. The putative postpartum problems were backaches (29.6%), arthralgia or leg clonus (12.7%), breast problems (19.6%), constipation (18.7%), haemorrhoids (11.7%), dizziness or headaches (14.8%), anaemia (10.0%). Multiple logistic regression analysis showed that leafy vegetable intake and frequent recipe change in the puerperium were positively associated with less anal diseases. Bathing or hair washing did not increase the risk of maternal infection as belief would have suggested. However, bathing was a risk factor for backache or arthralgia, and tooth brushing was a risk factor for bleeding gums. Excessive housework was a risk factor for anal diseases and disordered uterine involution.

Conclusion: Postpartum maternal health problems were prevalent in Hubei province. These were in part associated with postpartum traditional Chinese diets and behaviours.
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http://dx.doi.org/10.6133/apjcn.2016.25.2.03DOI Listing
May 2016

Lutein prevents high fat diet-induced atherosclerosis in ApoE-deficient mice by inhibiting NADPH oxidase and increasing PPAR expression.

Lipids 2015 Mar 7;50(3):261-73. Epub 2015 Feb 7.

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong Road, Wuhan, 430030, People's Republic of China.

Epidemiological and experimental studies provide supportive evidence that lutein, a major carotenoid, may act as a chemopreventive agent against atherosclerosis, although the underlying molecular mechanisms are not well understood. The main aim of this study was to investigate the effects of lutein on the alleviation of atherosclerosis and its molecular mechanisms involved in oxidative stress and lipid metabolism. Male apolipoprotein E knockout mice (n = 55) were fed either a normal chow diet or a high fat diet (HFD) supplemented with or without lutein for 24 weeks. The results showed that a HFD induced atherosclerosis formation, lipid metabolism disorders and oxidative stress, but noticeable improvements were observed in the lutein treated group. Additionally, lutein supplementation reversed the decreased protein expression of aortic heme oxygenase-1 and increased the mRNA and protein expressions of aortic nicotinamide-adenine dinucleotide phosphate oxidase stimulated by a HFD. Furthermore, the decreased mRNA and protein expression levels of hepatic peroxisome proliferator-activated receptor-α, carnitine palmitoyltransferase 1A, acyl CoA oxidase 1, low density lipoprotein receptors and scavenger receptor class B type I observed in mice with atherosclerosis were markedly enhanced after treatment with lutein. Taken together, these data add new evidence supporting the anti-atherogenic properties of lutein and describing its mechanisms of action in atherosclerosis prevention, including oxidative stress and lipid metabolism improvements.
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http://dx.doi.org/10.1007/s11745-015-3992-1DOI Listing
March 2015

[Exploratory study on the association between different iodine nutrition and the prevalence of dyslipidemia in Shenzhen City].

Wei Sheng Yan Jiu 2013 Jan;42(1):14-7

Shenzhen Centre for Chronic Disease Control, Shenzhen 518020, China.

Objective: To investigate the association between different iodine nutrition and the prevalence of dyslipidemia in a representative sample of subjects in Shenzhen.

Method: A total of 326 adults from 2 different communities in Shenzhen were included in the study. A questionnaire, physical examination and laboratory test were given to all subjects. 317 questionnaires and blood samples were effective.

Results: When the urine iodine concentration was less than 200 microg/L, there is a reverse relationship between iodine nutrition and prevalence of HDL-c (r(s) = - 0.164, P = 0.031). When the urine iodine concentration was higher than 300 microg/L, there is a positive relationship between iodine nutrition and prevalence of HDL-c (r(s) = 0.246, P = 0.013). There was no significant correlation between other lipid parameters and urinary iodine concentration. Multivariate Logistic regression analysis showed that high blood glucose and abdominal obesity were significantly related to the prevalence of dyslipidemia, urine iodine concentration was no significant correlation with the prevalence of dyslipidemia.

Conclusion: The prevalence of dyslipidemia in Shenzhen is high, there may be a U shaped relationship between iodine nutrition and the prevalence of abnormal HDL-c level.
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January 2013

Chronic leucine supplementation increases body weight and insulin sensitivity in rats on high-fat diet likely by promoting insulin signaling in insulin-target tissues.

Mol Nutr Food Res 2013 Jun 13;57(6):1067-79. Epub 2013 Feb 13.

Department of Nutrition and Food Hygiene and MOE Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, P R China.

Scope: This study investigated the effect of chronic leucine supplementation on insulin sensitivity and the associated mechanisms in rats on high-fat diet (HFD).

Methods And Results: Male Sprague-Dawley rats were fed either normal chow diet or HFD supplemented with 0, 1.5, 3.0, and 4.5% leucine for 24 weeks. We found that chronic leucine supplementation increased insulin sensitivity together with increased body weight in rats on HFD, but had no effect on insulin sensitivity in rats on normal chow diet. The increased insulin sensitivity by leucine supplementation was not associated with altered ectopic fat accumulation in liver and muscle, plasma levels of lipids and cytokines, but is associated with reduced oxidative stress and improved insulin signaling. Chronic leucine supplementation did not enhance insulin receptor substract-1 (IRS-1) phosphorylation on serine 302, but elevated basal IRS-1 phosphorylation on tyrosine 632 and improved insulin-stimulated protein kinase B (Akt) and mammalian target of rapamycin (mTOR) phosphorylation in liver, skeletal muscle, and adipose tissue of rats on HFD rats, indicating leucine supplementation prevented HFD-induced insulin resistance in insulin-target tissues.

Conclusion: Chronic leucine supplementation can increase insulin sensitivity and body weight likely by reducing oxidative stress and improving insulin signaling pathway in rats on HFD.
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http://dx.doi.org/10.1002/mnfr.201200311DOI Listing
June 2013

Leucine facilitates insulin signaling through a Gαi protein-dependent signaling pathway in hepatocytes.

J Biol Chem 2013 Mar 12;288(13):9313-20. Epub 2013 Feb 12.

Department of Nutrition and Food Hygiene and MOE Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, China.

In this study, we addressed the direct effect of leucine on insulin signaling. In investigating the associated mechanisms, we found that leucine itself does not activate the classical Akt- or ERK1/2 MAP kinase-dependent signaling pathways but can facilitate the insulin-induced phosphorylations of Akt(473) and ERK1/2 in a time- and dose-dependent manner in cultured hepatocytes. The leucine-facilitated insulin-induced phosphorylation of Akt at residue 473 was not affected by knocking down the key component of mTORC1 or -2 complexes but was blocked by inhibition of c-Src (PP2), PI3K (LY294002), Gαi protein (pertussis toxin or siRNA against Gαi1 gene, or β-arrestin 2 (siRNA)). Similarly, the leucine-facilitated insulin activation of ERK1/2 was also blunted by pertussis toxin. We further show that leucine facilitated the insulin-mediated suppression of glucose production and expression of key gluconeogenic genes in a Gαi1 protein-dependent manner in cultured primary hepatocytes. Together, these results show that leucine can directly facilitate insulin signaling through a Gαi protein-dependent intracellular signaling pathway. This is the first evidence showing that macronutrients like amino acid leucine can facilitate insulin signaling through G proteins directly.
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http://dx.doi.org/10.1074/jbc.M112.409409DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3611002PMC
March 2013

Alleviative effects of resveratrol on nonalcoholic fatty liver disease are associated with up regulation of hepatic low density lipoprotein receptor and scavenger receptor class B type I gene expressions in rats.

Food Chem Toxicol 2013 Feb 2;52:12-8. Epub 2012 Nov 2.

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science & Technology, Wuhan 430030, PR China.

Lipid metabolic disorders are widely considered to be one of the most critical and basic link in the pathogenesis of nonalcoholic fatty liver disease (NAFLD). The aim of this study was to illustrate the alleviation function of resveratrol (Res) on NAFLD and the roles of hepatic fatty acid synthase (FAS), low density lipoprotein receptor (LDLr), scavenger receptor class B type I (SR-BI), and thyroid hormone receptor β1 (TRβ1), which are the key molecules involved in lipid metabolism. Adult male Wistar rats were fed a normal diet or high fat/sucrose diet (HFS) with or without resveratrol for 13 weeks. HFS induced NAFLD formation and increased the lipids concentrations in serum and livers of rats, while noticeable improvement has been reached by Res intervention. Moreover, Res protected against HFS-induced decrease in hepatic LDLr and SR-BI mRNA and protein expressions, whereas TRβ1 expressions were impervious with/without Res. Unexpectedly, hepatic FAS gene expressions were markedly diminished in NAFLD rats and were gradually increased by treatment with Res. These data indicate that the alleviative effects of Res on NAFLD are associated with up regulation of hepatic LDLr and SR-BI gene expressions, which provide new insights into the pharmacological targets of Res in the prevention of NAFLD.
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http://dx.doi.org/10.1016/j.fct.2012.10.026DOI Listing
February 2013

Resveratrol ameliorates high-glucose-induced hyperpermeability mediated by caveolae via VEGF/KDR pathway.

Genes Nutr 2013 Mar 16;8(2):231-9. Epub 2012 Sep 16.

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China.

Endothelial hyperpermeability induced by hyperglycemia is the initial step in the development of atherosclerosis, one of the most serious cardiovascular complications in diabetes. In the present study, we investigated the effects of resveratrol (RSV), a bioactive ingredient extracted from Chinese herb rhizoma polygonum cuspidatum, on permeability in vitro and the molecular mechanisms involved. Permeability was assessed by the efflux of fluorescein isothiocyanate (FITC)-dextran permeated through the monolayer endothelial cells (ECs). The mRNA levels, protein expressions, and secretions were measured by quantitative real-time PCR, western blot, and ELISA, respectively. Increased permeability and caveolin-1 (cav-1) expression were observed in monolayer ECs exposed to high glucose. Resveratrol treatment alleviated the hyperpermeability and the overexpression of cav-1 induced by high glucose in a dose-dependent manner. β-Cyclodextrin, a structural inhibitor of caveolae, reduced the hyperpermeability caused by high glucose. Resveratrol also down-regulated the increased expressions of vascular endothelial growth factor (VEGF) and kinase insert domain receptor (KDR, or VEGF receptor-2) induced by high glucose. Inhibition of VEGF/KDR pathway by using SU5416, a selective inhibitor of KDR, alleviated the hyperpermeability and the cav-1 overexpression induced by high glucose. The above results demonstrate that RSV ameliorates caveolae-mediated hyperpermeability induced by high glucose via VEGF/KDR pathway.
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http://dx.doi.org/10.1007/s12263-012-0319-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3575886PMC
March 2013

Resveratrol reduces vascular cell senescence through attenuation of oxidative stress by SIRT1/NADPH oxidase-dependent mechanisms.

J Nutr Biochem 2012 Nov 27;23(11):1410-6. Epub 2012 Jan 27.

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China.

Objective: Senescence of vascular cells contributes to the development of cardiovascular diseases and the overall aging. This study was undertaken to investigate the effects of resveratrol (Res) on amelioration of vascular cell aging and the role of SIRT1/nicotinamide adenine dinucleotide phosphate (NADPH) oxidase pathway.

Methods And Results: Adult male Wistar rats were treated with a high-fat/sucrose diet (HFS) in the presence or absence of Res for 3 months. HFS and in vitro treatment with high glucose increased the senescence cells and reactive oxygen species production in rat aorta and cultured bovine aortic endothelial cells (BAECs), respectively, which was attenuated by Res treatment. Res protected against HFS- or high-glucose-induced increase in NADPH oxidase p47phox expression and decrease in SIRT1 level. Apocynin, a NADPH oxidase inhibitor, down-regulated p47phox protein expression, but had no influence on SIRT1 protein; sirtinol, a SIRT1 inhibitor, aggravated the decrease in SIRT1 protein level and the increase in p47phox protein expression induced by high glucose.

Conclusion: Our studies suggested that Res was able to reverse the senescence process in aorta induced by HFS in rats or induced by the exposure to high glucose in cultured BAECs. The underlying mechanism is at least SIRT1/NADPH oxidase pathway dependent.
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http://dx.doi.org/10.1016/j.jnutbio.2011.08.008DOI Listing
November 2012

Excess iodine and high-fat diet combination modulates lipid profile, thyroid hormone, and hepatic LDLr expression values in mice.

Biol Trace Elem Res 2012 Jun 6;147(1-3):233-9. Epub 2012 Jan 6.

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China.

The aim of this study was to illustrate the combined effect of excess iodine and high-fat diet on lipid metabolism and its potential molecular mechanism. Sixty Balb/c mice were randomly allocated to three control groups or three excess iodine groups and fed with a high-fat diet in the absence or presence of 1,200 μg/L iodine for 1, 3, or 6 months, respectively. Serum lipid parameters and serum thyroid hormones were measured. Expressions of scavenger receptor class B type-I (SR-BI) and low density lipoproteins receptor (LDLr) mRNA and protein in liver were detected. Thyroid histology and liver type 1 iodothyronine deiodinase activity were analyzed. At the end of 3 and 6 months, compared with control, serum TC, TG, and LDL-C in excess iodine group were significantly lower (p < 0.05). LDLr expression in liver was increased significantly (p < 0.05) and parallel to the change of serum TC and TG. TT3 and TT4 levels in serum were elevated and TSH decreased significantly (p < 0.05). Liver type I iodothyronine deiodinase activity was significantly higher (p < 0.05) than control at the end of 6 months. Moreover, a time course damage effect of excess iodine combined with high-fat diet on thyroid glands was observed. The present findings demonstrated that excess iodine combined with high-fat diet could cause damage to thyroid glands and lead to thyroid hormone disorder. Those in turn caused the upregulation of hepatic LDLr gene, which resulted in the disorder in serum lipids.
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http://dx.doi.org/10.1007/s12011-011-9300-xDOI Listing
June 2012

Biphasic effects of chronic ethanol exposure on insulin-stimulated glucose uptake in primary cultured rat skeletal muscle cells: role of the Akt pathway and GLUT4.

Diabetes Metab Res Rev 2011 Jan 11;27(1):47-53. Epub 2010 Nov 11.

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China.

Background: mild or moderate chronic alcohol intake has been shown to be associated with increased insulin sensitivity, while chronic alcohol abuse demonstrates a contrary effect. The mechanism underlying this biphasic effect has not yet been clarified. We investigated whether chronic ethanol exposure mediates biphasic changes on insulin sensitivity and whether the phosphatidylinositol 3-kinase/Akt pathway is involved in vitro.

Methods: primary cultured rat skeletal muscle cells were exposed to ethanol (0-400 mM) for 24 h. Insulin sensitivity was assessed by the (3) H-labelled 2-deoxyglucose uptake assay. Phosphatidylinositol 3-kinase, cytosol and cell membrane glucose transporter-4 (GLUT4), as well as the Akt phosphorylated form, were analyzed by Western blots.

Results: biphasic effects of ethanol on insulin sensitivity were observed in primary cultured skeletal muscle cells in a dose-dependent manner. Compared with the untreated group, 50 and 100 mM concentrations of ethanol resulted in a significant increase in 2-deoxyglucose uptake by 29 and 28%, respectively, while higher concentrations of ethanol (200, 400 mM) showed a significant decrease in 2-deoxyglucose uptake by 28 and 47%, respectively. The changes in glucose transport activity were in line with the changes in Akt Ser473 phosphorylation and GLUT4 expression in an ethanol dose-dependent biphasic manner. The phosphorylation of Akt and GLUT4 protein contents were up-regulated after treatment with low concentrations of ethanol (50, 100 mM) and down-regulated with high concentrations of ethanol (200, 400 mM) for 24 h.

Conclusion: ethanol mediates biphasic changes on insulin sensitivity at least in part via the Akt pathway and GLUT4 expression.
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http://dx.doi.org/10.1002/dmrr.1152DOI Listing
January 2011

Green tea polyphenols inhibit plasminogen activator inhibitor-1 expression and secretion in endothelial cells.

Blood Coagul Fibrinolysis 2009 Oct;20(7):552-7

Department of Nutrition and Food Hygiene, School of Public Health, PR China.

Compelling epidemiological evidence suggests that the consumption of green tea is associated with beneficial effects in prevention of cardiovascular diseases. Plasminogen activator inhibitor-1 (PAI-1) is known to play a pivotal role in cardiovascular diseases including arteriosclerosis and hypertension. Increased PAI-1 was found in atherosclerotic lesions, and high PAI-1 plasma levels were associated with coronary heart disease. To determine the effect and molecular mechanism of green tea polyphenols (GTPs) on the regulation of PAI-1 expression in endothelial cells, bovine aortic endothelial cells were incubated with GTPs, and PAI-1 expressions were measured by western blot and enzyme-linked immunosorbent assay, respectively. GTPs significantly reduced PAI-1 expression and secretion in a time-dependent and dose-dependent manner. Inhibition of phosphatidylinositol 3-kinase (PI3K) with wortmannin markedly reversed GTPs repression of PAI-1 expression. In addition, the GTP-induced inhibitory effect was associated with an increased of activation of the protein kinase Akt. These results suggest that GTPs inhibit PAI-1 expression and its release from endothelial cells through the PI3K/Akt pathway, which may contribute to cardiovascular protection.
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http://dx.doi.org/10.1097/MBC.0b013e32832e05f0DOI Listing
October 2009

Association between heme oxygenase-1 gene promoter polymorphisms and type 2 diabetes in a Chinese population.

Am J Epidemiol 2009 Sep 20;170(6):747-56. Epub 2009 Aug 20.

Department of Nutrition and Food Hygiene and MOE Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China.

The authors aimed to determine whether 2 functional polymorphisms in the heme oxygenase-1 (HO-1) gene promoter are associated with type 2 diabetes mellitus (T2DM). A Chinese case-control study involving 1,103 newly diagnosed T2DM patients, 371 patients with impaired glucose regulation (IGR), and 1,615 controls was performed (December 2004-December 2007). A (GT)(n) microsatellite polymorphism and a single nucleotide polymorphism, T(-413)A, were genotyped, and their functional relevance was evaluated by examining the level of HO-1 protein expression. For the (GT)(n) microsatellite polymorphism, genotypes with the L (GT)(n) allele (>or=25 GT repeats) were associated with increased odds of IGR or T2DM compared with the S/S genotype (<25 GT repeats) (S/L genotype: odds ratio (OR) = 1.35, P = 0.048; L/L genotype: OR = 1.65, P = 0.006). Subsequent haplotype analysis showed that haplotype TL contributed to increased odds of IGR or T2DM compared with haplotype TS (OR = 1.56, P = 0.003). In functional analyses, HO-1 expression level was significantly reduced in persons with IGR and T2DM carrying the L/L (GT)(n) genotype compared with persons with the S/S genotype. Further haplotype combination assay confirmed the functional dominance of the (GT)(n) microsatellite polymorphism over the T(-413)A single nucleotide polymorphism. These results support an association between the HO-1 (GT)(n) microsatellite polymorphism, HO-1 expression levels, and the odds of T2DM.
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http://dx.doi.org/10.1093/aje/kwp196DOI Listing
September 2009

Impaired ghrelin response after high-fat meals is associated with decreased satiety in obese and lean Chinese young adults.

J Nutr 2009 Jul 20;139(7):1286-91. Epub 2009 May 20.

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China.

Ghrelin and peptide tyrosine tyrosine (PYY) are known to affect appetite and body weight, but the acute effects of fat-rich and carbohydrate-rich meals on plasma ghrelin, PYY response, and appetite remain unclear. We hypothesized that obese individuals had impaired postprandial ghrelin and PYY response based on macronutrient content of meals, affecting appetite and energy intake. We conducted a randomized crossover trail comparing fasting ghrelin and PYY concentrations, postprandial ghrelin and PYY responses, and subjective appetite in 15 obese and 12 lean Chinese young adults after they consumed isocaloric high-carbohydrate [HC; 88% energy carbohydrate, 4% energy fat, 8% energy protein] and high-fat (HF; 25% energy carbohydrate, 71% energy fat, 4% energy protein) meals. Ghrelin concentrations over time differed between HC and HF meals (P < 0.01) via repeated measures of ANOVA, with lower postprandial ghrelin suppression after HF meals, especially among obese participants. PYY response differed between meals among lean participants, with a delayed and higher postprandial PYY peak after the HF meal (P < 0.01); however, PYY response did not differ among obese participants. The incremental area under the curve of PYY was higher in lean than in obese participants after the HF meal (P < 0.01). These results suggest that impaired ghrelin response after HF meals may contribute to reduced satiety and overeating, especially among obese individuals. Whether an attenuated response of PYY in obese participants after a HF meal bears any physiological consequences warrants further study.
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http://dx.doi.org/10.3945/jn.109.104406DOI Listing
July 2009

Green tea polyphenols down-regulate caveolin-1 expression via ERK1/2 and p38MAPK in endothelial cells.

J Nutr Biochem 2009 Dec 5;20(12):1021-7. Epub 2009 Feb 5.

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China.

Caveolin-1 (Cav-1), a negative regulator of endothelial nitric oxide synthase (eNOS), influences various aspects of the cardiovascular functions. We had reported that a high-fat diet up-regulated aortic Cav-1 expressions in rats. In this study, we investigated the effects of green tea polyphenols (GTPs) on endothelial Cav-1 expression and phosphorylation in vitro. Bovine aortic endothelial cells (BAECs) were treated with 4 microg/ml GTPs for 0, 4, 8, 12, 16 and 24 h, and with 0, 0.04, 0.4, 4 and 40 microg/ml GTPs for 16 h, respectively. Cav-1 protein and mRNA were detected using Western blot and reverse transcriptase polymerase chain reaction. Cav-1 protein expression was down-regulated after treatment of BAECs with 4 microg/ml GTPs for 12, 16 and 24 h. And decrease in the level of Cav-1 mRNA was observed after GTP treatment for 4 and 8 h. GTPs (0.04-4 microg/ml) down-regulate Cav-1 protein expressions and mRNA levels dose dependently. PD98059, an inhibitor of extracellular signal-regulated kinase 1/2 (ERK1/2), up-regulated Cav-1 expression in BAECs alone and abolished the down-regulation effects of GTPs in BAECs while pretreatment with it. Inhibition of p38 mitogen-activated protein kinase (p38MAPK) with SB203580, which down-regulates Cav-1 expression in BAECs alone, deteriorated the Cav-1 down-regulating effects by GTPs. In addition to the effects on expression of Cav-1, GTP treatment inhibited phosphorylation of Cav-1 [tyrosine 14 (Tyr14)]. These data indicate that GTPs down-regulate gene expression of Cav-1 time- and dose- dependently via activating ERK1/2 and inhibiting p38MAPK signaling.
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http://dx.doi.org/10.1016/j.jnutbio.2008.12.001DOI Listing
December 2009

The effect of health and nutrition education intervention on women's postpartum beliefs and practices: a randomized controlled trial.

BMC Public Health 2009 Feb 1;9:45. Epub 2009 Feb 1.

Department of Nutrition and Food Hygiene, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou 510515, PR China.

Background: 'Sitting month' is the Chinese tradition for postpartum customs. Available studies indicate that some of the traditional postpartum practices are potentially harmful for women's health. However, no intervention study aiming at postpartum practices has been performed. In this paper we evaluated the effect of a health and nutrition education intervention, which focused on improving postpartum dietary quality and optimal health behaviors.

Methods: The study design was a randomized controlled trial conducted in both urban and rural area of Hubei between August 2003 and June 2004. A total of 302 women who attended the antenatal clinic during the third trimester with an uncomplicated pregnancy were recruited. Women randomized to the education intervention group in both urban and rural area received two two-hour prenatal education sessions and four postpartum counseling visits. Control group women received usual health care during pregnancy and postpartum period. Women were followed up until 42 days postpartum. Outcome measures were nutrition and health knowledge, dietary behavior, health behavior and health problems during the postpartum period.

Results: Women in the intervention groups exhibited significantly greater improvement in overall dietary behaviors such as consumption of fruits, vegetables, soybean and soybean products as well as nutrition and health knowledge than those in the control groups. Significantly more women in the intervention groups give up the traditional behavior taboos. The incidence of constipation, leg cramp or joint pain and prolonged lochia rubra was significantly lower in the intervention groups as compared with the control groups.

Conclusion: The study shows that health and nutrition education intervention enable the women take away some of the unhealthy traditional postpartum practices and decrease the prevalence of postpartum health problems. The intervention has potential for adaptation and development to large-scale implementation.

Trial Registration Number: klACTRN12607000549426.
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http://dx.doi.org/10.1186/1471-2458-9-45DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2640472PMC
February 2009

Effect of excessive iodine on immune function of lymphocytes and intervention with selenium.

J Huazhong Univ Sci Technolog Med Sci 2007 Aug;27(4):422-5

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.

In order to study the effect of excessive iodine on immune function of lymphocytes and the role of selenium supplementation with excessive iodine intake, the changes of T lymphocyte number, ratio of subsets, activity of natural killer (NK) cells and lymphocytes proliferation response were investigated. 150 female BALB/C mice were randomly divided into 5 groups in terms of their body weight (n=30 in each group), and 10 of each group were taken as one batch for test. Mice in the 5 groups were orally administrated with iodine 0 (group I), 1500 (group II), 3000 (group III), 6000 microg/L (group IV), iodine 6000 microg/L plus selenium 0.3 mg/L (group V) respectively for 30 days Lymphocyte proliferation response, CD4(+)/CD8(+), Th1/Th2 and the activity of NK cells were measured. CD4(+)/CD8(+) was significantly lower, while lymphocyte proliferation response stronger, and Th1/Th2 and the activity of NK cells significantly higher in group IV than in group I (P<0.01). There was no significant difference in all indexes between group V and group I (P>0.05). It was suggested that excessive iodine as exogenous chemical materials can induce disorders of T lymphocyte immune function in mice. 0.3 mg/L selenium supplementation can protect mice against toxicity induced by 6000 microg/L iodine.
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http://dx.doi.org/10.1007/s11596-007-0418-1DOI Listing
August 2007

Ginkgo biloba extract prevents ethanol induced dyslipidemia.

Am J Chin Med 2007 ;35(4):643-52

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong Road, Wuhan, 430030, China.

Ginkgo biloba extract (EGB) functions as a natural substantial antioxidant and hypolipidemic. Chronic alcohol abuse leads to sustained dyslipidemia characterized by hyperlipidemia and lipid peroxidation. Thus, the present study investigates the effect of EGB on lipid disorders induced by ethanol in rats. Male Sprague-Dawley rats were fed with ethanol (2.4 g/kg), and pretreated with a daily dose of low or high EGB (48 or 96 mg/kg, respectively). During the experiment, serum was collected on day 30, 60, and 90. Serum lipid profile, including lipid peroxidation, was determined by colorimetric methods. Our data showed that ethanol intake resulted in a time-dependent increase in serum levels of triglyceride (TG), total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C) and malondialdehyde (MDA), and a decrease of the ratio of high-density lipoprotein cholesterol (HDL-C) against TC. EGB prophylactic medication (48 and 96 mg/kg), especially at the high dose, significantly increased HDL-C content, and normalized the abnormal lipid profile and peroxidation in comparison to ethanol-fed only rats. These results suggest that ethanol results in time-dependent hypercholesterolemia, hypertriglyceridemia and promotes serum lipid peroxidation. EGB pretreatment prevents hyperlipidemia and ameliorates lipid peroxidation induced by ethanol.
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http://dx.doi.org/10.1142/S0192415X07005132DOI Listing
November 2007

High-fat diet up-regulates caveolin-1 expression in aorta of diet-induced obese but not in diet-resistant rats.

Cardiovasc Res 2007 Oct 6;76(1):167-74. Epub 2007 Jun 6.

Department of Nutrition & Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science & Technology, Wuhan 430030, PR China.

Objective: Caveolin-1 (Cav-1) is considered as a negative regulator of endothelial nitric oxide synthase (eNOS) and influences various cardiovascular functions. The objective of the study is to investigate the effects of high-fat diet on vascular Cav-1 expression and eNOS activities.

Methods: Male outbred Sprague-Dawley rats were fed with a high-fat diet for 15 weeks to induce obesity. The diet-induced obese (DIO) rats were then divided into two groups. One group (DIO-LF) was fed a normal diet and another group (DIO-HF) along with diet-resistance (DR) rats were fed a high-fat diet for 8 more weeks. Cav-1 expression was determined using reverse transcription (RT)-PCR, Western blotting, and immunohistochemistry techniques. NOS activities were assessed using Griess reagents. Protein kinase B (PKB/Akt) and eNOS expression and phosphorylation were determined by Western blotting.

Results: A high-fat diet up-regulated Cav-1 and down-regulated eNOS expression in aorta of DIO rats, but not in that of DR rats. These effects were reversed in DIO rats after switching to a low-fat diet for 8 weeks. Decreased NOS activities in aortas were observed in DIO rats, but not in DR rats. Phosphorylation of PKB/Akt and eNOS (Ser1177) were enhanced in aortas of DIO rats of both DIO-HF and DIO-LF groups.

Conclusion: These findings suggest that the decrease of vascular NOS activities in rats fed a high-fat diet were due, at least in part, to the up-regulation of Cav-1 expression.
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http://dx.doi.org/10.1016/j.cardiores.2007.05.028DOI Listing
October 2007

Perceived stress, depression and food consumption frequency in the college students of China Seven Cities.

Physiol Behav 2007 Nov 2;92(4):748-54. Epub 2007 Jun 2.

College of Food Science, South China Agricultural University, 510642 Guangzhou, China.

The aim of the study was to explore the association between perceived stress, depression and food consumption frequency. A self-administered questionnaire that included the perceived stress scale, the depression scale and dietary intake was used in the baseline survey of a cohort study of 2579 local college students over 7 cities in China. Gender and city differences were found in perceived stress scores and depression scores. There were also significant differences among diverse smoking levels and among perceived weight categories in perceived stress and depression scores. Stepwise logistic regression models found that frequency of consumption of fresh fruit, ready-to-eat food and snack food had apparently independent effects on perceived stress, whereas the intake level of fresh fruit, ready-to-eat food and fast food was significantly associated with depression. The link between food consumption frequency, perceived stress and depression suggests that diet intervention may be considered a mediate strategy integrated in psychology prevention program among normal population of the college.
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http://dx.doi.org/10.1016/j.physbeh.2007.05.068DOI Listing
November 2007

Heme oxygenase-1 upregulated by Ginkgo biloba extract: potential protection against ethanol-induced oxidative liver damage.

Food Chem Toxicol 2007 Aug 31;45(8):1333-42. Epub 2007 Jan 31.

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong Road, Wuhan 430030, PR China.

Oxidative stress plays a pivotal role in the pathogenesis and progression of alcoholic liver disease (ALD) and HO-1 induction is suggested to protect hepatocytes from ethanol hepatotoxicity. Here, we present the data to explore the hepatoprotective effect and underlying mechanism(s) of Ginkgo biloba extract (EGB), a naturally occurring HO-1 inducer, against ethanol-induced oxidative damage. Ethanol-fed (2.4 g/kg) male rats were pretreated by EGB (48 or 96 mg/kg) for 90 days. Liver damage was evaluated by histopathology and serum aminotransferase assay. Hepatic redox parameters were measured by spectrophotometry. Heme oxygenase-1 (HO-1) expression was determined by RT-PCR and flow cytometry on mRNA and protein level, respectively. Our results showed that EGB, especially at high dose, ameliorated ethanol-induced macrovesicular steatosis and parenchymatous degeneration in hepatocytes, and decreased serum aminotransferases level. Furthermore, EGB reduced ethanol-derived glutathione depletion and lipid peroxidation, and inhibited the inactivation of superoxide dismutase, glutathione peroxidase and catalase, although EGB itself had no influence on such parameters. Importantly, EGB induced hepatic microsomal HO-1 on mRNA, protein expression and enzymatic activity, which is paralleled to the EGB-derived hepatoprotective effect. Hence, HO-1 upregulation by EGB may enhance the antioxidative capacity against the ethanol-induced oxidative stress and maintain the cellular redox balance.
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http://dx.doi.org/10.1016/j.fct.2007.01.016DOI Listing
August 2007

Effect of Momordica grosvenori on oxidative stress pathways in renal mitochondria of normal and alloxan-induced diabetic mice. Involvement of heme oxygenase-1.

Eur J Nutr 2007 Mar;46(2):61-9

Dept. of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science & Technology, 13 Hangkong Road, Wuhan, 430030, P.R. China.

Background: Oxidative stress plays an important role in the pathogenesis of diabetes and diabetic nephropathy. Momordica grosvenori (MG), a traditional medicinal herb used as substitute sugar for obese and diabetes, exhibits anti-oxidative activity in vitro.

Aim Of The Study: This study investigated the effect of MG on renal mitochondrial lipid peroxidation, anti-oxidative defense system, and a potent oxidative stress-responsive protein, heme oxygenase-1 (HO-1) of nondiabetic and alloxan-diabetic mice in different stages of diabetes.

Methods: Male Balb/c mice were rendered diabetic by a single intra-peritoneal injection of alloxan (200 mg/kg), while control mice received sham saline injection. Control and diabetic mice were further subdivided according to their treatments: control (saline), low dose MG (150 mg/kg) and high dose MG (300 mg/kg), which were administered immediately after confirmation of hyperglycemia by gavage daily over an 8-week period. Mice were killed by cervical dislocation at 4th and 8th week, respectively, and serum and renal tissues were harvested. Serum glucose, lipid profile and renal function were evaluated; renal homogenate were subjected to determination of malondialdehyde (MDA) and glutathione (GSH) concentration, manganese superoxide dismutase (Mn-SOD), glutathione peroxidase (GSH-Px) and HO-1 activities, together with Mn-SOD and HO-1 mRNA expression; paraffin-embedded renal tissues was used for routine histopathological examination.

Results: Short-term diabetes caused hyperglycemia and intensified oxidative stress in renal mitochondrial demonstrated by higher MDA and lower GSH levels than control group, accompanied by increased mRNA expression and activity of HO-1 and Mn-SOD, and augmented GSH-Px activity. Low dose of MG administration ameliorated hyperglycemia, inhibited HO-1 and Mn-SOD mRNA expression and reduced HO-1, Mn-SOD, GSH-Px activities. Diabetic mice did not demonstrate early symptoms of diabetic nephropathy until 8th week, characterized by hyperglycemia, hyperlipidemia, and renal damage. A progressive increment in MDA level and decrease in GSH level, as well as reduced mRNA expression and activity of Mn-SOD and HO-1 in the kidney were observed. Low dose of MG attenuated diabetic nephropa- thy symptoms partially, inhibited lipid peroxidation, up-regulated HO-1 and Mn-SOD mRNA expression, and increased HO-1 activity. Conclusions The study confirmed the involvement of oxidative stress in the development of diabetes mediated by the pro- and antioxidant role of HO-1, and pointed to the possible anti-oxidative mechanism of the anti-diabetic and nephroprotective action of MG.
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http://dx.doi.org/10.1007/s00394-006-0632-9DOI Listing
March 2007

Oxidative stress, antioxidant status and DNA damage in patients with impaired glucose regulation and newly diagnosed Type 2 diabetes.

Clin Sci (Lond) 2007 Jun;112(12):599-606

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China.

Previous studies have postulated the association between oxidative stress and Type 2 diabetes. Considering the long pre-diabetic period with IGR (impaired glucose regulation) and its high risk of developing diabetes, to test this hypothesis, we have investigated oxidative stress pathways and DNA damage in patients with IGR and newly diagnosed Type 2 diabetes. The study population consisted of 92 subjects with NGT (normal glucose tolerance), 78 patients with IGR and 113 patients with newly diagnosed diabetes. Plasma MDA (malondialdehyde) and TAC (total antioxidative capacity) status, erythrocyte GSH content and SOD (superoxide dismutase) activity were determined. A comet assay was employed to evaluate DNA damage. Compared with subjects with NGT, patients with IGR had reduced erythrocyte SOD activity. Patients with diabetes had a higher plasma MDA concentration, but a lower plasma TAC level and erythrocyte SOD activity, than the NGT group. Correlation analysis revealed a strong positive association between IR (insulin resistance) and MDA concentration, but negative correlations with TAC status and SOD activity. With respect to beta-cell function, a positive association with TAC status and an inverse correlation with GSH respectively, were observed. The comet assay revealed slight DNA damage in patients with IGR, which was increased in patients with diabetes. Significant correlations were observed between DNA damage and hyperglycaemia, IR and beta-cell dysfunction. In conclusion, the results of the present study suggest that hyperglycaemia in an IGR state caused the predominance of oxidative stress over antioxidative defence systems, leading to oxidative DNA damage, which possibly contributed to pancreatic beta-cell dysfunction, IR and more pronounced hyperglycaemia. This vicious circle finally induced the deterioration to diabetes.
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http://dx.doi.org/10.1042/CS20060323DOI Listing
June 2007

Effect of selenium on thyroid hormone metabolism in filial cerebrum of mice with excessive iodine exposure.

Biol Trace Elem Res 2006 Dec;113(3):281-95

Department of Nutrition and Food Hygiene, Public Health School, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China.

The effects of supplementing selenium on thyroid hormone metabolism were studied on mice with excessive iodine exposure. The serum concentrations of thyroxine (T4) and triiodothyronine (T3) and the activities of iodothyronine 5\' and 5-deiodinase (D2, D3) were measured in the brain of filial mice to study the influence of selenium on thyroid hormone metabolism. Measurements were carried out on postnatal day 0, 14, and 28. It was found that selenium supplementation alleviated the adverse effects of excessive iodine on progeny. The serum TT4 level as well as TT4 and TT3 concentrations and D3 activity in cerebrum of progeny decreased, whereas D2 activity increased in the cerebrum of progeny on postnatal day 0 and 14. Selenium supplementation exerted some favorable effects on thyroid hormone metabolism in cerebrum of progeny of dam with excessive iodine intake.
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http://dx.doi.org/10.1385/BTER:113:3:281DOI Listing
December 2006

Postpartum practices of puerperal women and their influencing factors in three regions of Hubei, China.

BMC Public Health 2006 Nov 7;6:274. Epub 2006 Nov 7.

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science & Technology, 13 Hangkong Road, Wuhan 430030, PR China.

Background: 'Sitting month' is a Chinese tradition for women's postpartum custom. The present study aims to explore the postpartum dietary and health practices of puerperal women and identify their influential factors in three selected regions of Hubei, China.

Methods: A cross-sectional retrospective study was conducted in the selected urban, suburban and rural areas in the province of Hubei from 1 March to 30 May 2003. A total of 2100 women who had given birth to full-term singleton infants in the past two years were selected as the participants. Data regarding postpartum practices and potentially related factors were collected through questionnaire by trained investigators.

Results: During the puerperium, 18% of the participants never ate vegetables, 78.8% never ate fruit and 75.7% never drank milk. Behaviour taboos such as no bathing, no hair washing or teeth brushing were still popular among the participants. About half of the women didn't get out of the bed two days after giving birth. The average time they stayed in bed during this period was 18.0 h. One third of them didn't have any outdoor activities in that time periods. The educational background of both women and their spouses, location of their residence, family income, postnatal visit, nutrition and health care educational courses were found to be the influencing factors of women's postpartum practices.

Conclusion: Traditional postpartum dietary and health behaviours were still popular among women in Hubei. Identifying the factors associated with traditional postpartum practices is critical to develop better targeting health education programs. Updated Information regarding postpartum dietary and health practices should be disseminated to women.
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http://dx.doi.org/10.1186/1471-2458-6-274DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1636040PMC
November 2006

A natural sweetener, Momordica grosvenori, attenuates the imbalance of cellular immune functions in alloxan-induced diabetic mice.

Phytother Res 2006 Jul;20(7):552-60

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong Road, Wuhan 430030, P.R. China.

Momordica grosvenori (MG), a traditional medicinal herb in China used as a substitute sugar for obese and diabetic patients, exhibited an enhancement of immunity. Heme oxygenase-1 (HO-1) is among the acute phase proteins that play an important role in the inflammatory process and have antiinflammatory activities with their antioxidant properties. The hypothesis that MG could modulate an imbalance of the cellular immune system and prevent the progression of diabetes mellitus, via induction of HO-1 protein expression was investigated. Diabetes was induced in male Balb/c mice by intraperitoneal injection of alloxan (200 mg/kg). The mice were randomly assigned to non-diabetic and diabetic groups, and further subdivided according to their treatments: control (distilled water), low dose MG (150 mg/kg) and high dose MG (300 mg/kg), which were administered by gavage in 24 h cycles over a 30 day period. MG administration effectively regulated the immune imbalance in diabetic mice, principally by upregulating the CD4(+) T lymphocyte subsets, and remodeling the intracellular cytokine profiles (reducing the expression of pro-inflammatory Th1 cytokines towards a beneficial Th2 pattern), ascribed to its induction and upregulation of HO-1. In conclusion, MG exhibited antidiabetic effects and may be used as a new natural drug for the treatment of diabetes.
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http://dx.doi.org/10.1002/ptr.1903DOI Listing
July 2006

[Effect of excessive iodine exposure on the serum TC and TG level in rats].

Wei Sheng Yan Jiu 2006 Jan;35(1):108-10

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Hua zhong University of Science and Technology, Wuhan 430030, China.

Objective: To study effect of excessive iodine exposure on the serum TC and TG level in rate.

Methods: According to body weight, 60 Wistar rats were divided into 6 groups and given drinking water including different doses of iodine. The iodine concentrations were 0 (control), 1800, 3600, 7200, 14000 and 28000 microg/L, respectively. Three months later, related indices were determined.

Results: In excessive iodine groups, no obvious changes of thyroid morphology was observed. Urinary iodine level increased dose-dependently. Excessive iodine intake resulted in a significant reduce of serum TT4 level and an obvious increase of serum TC level in a dose-dependent manner. The positive correlation was observed between serum TC and urinary iodine. There was the negative correlation between serum TC and serum T4.

Conclusion: Excessive-iodine exposure resulted in an increase in serum TC level. And serum lipids, together with urinary iodine and serum thyroid hormones, could be used as biomarkers for excessive iodine exposure.
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January 2006

[Effect of selenium supplement on the disordered lipid metabolism induced by the overdose of iodine in mice].

Wei Sheng Yan Jiu 2006 Jan;35(1):52-4

Department of Nutrition and Hygiene, School of Public Health, Tongji Medical College, Huazhong Science and Technology University, Wuhan 430030, China.

Objective: To explore the effect of selenium supplement on the disordered lipid metabolism induced by the overdose of iodine in mice.

Methods: The 80 Balb/c mice were randomly divided into eight groups, the normal control group, the high iodine group (drunk the water containing iodine 3000 microg/L) and six selenium groups (drunk the water containing iodine 3000 microg/L and selenium 0.1, 0.2, 0.3, 0.4, 0.5, 0.75 mg/L). The total cholesterol and triglyceride in serum and liver were determined.

Results: The total cholesterol in serum, the total cholesterol and triglyceride in liver of high-iodine group increased significantly compared with normal control group. There is no difference between normal control group and the group drunk the water contained 0.2 mg/L selenium.

Conclusion: It suggests that it is an effective intervention dosage to drunk water containing 0.2 mg/L selenium.
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January 2006

[Relation between peptide YY 3-36 and dietary induced obesity resistant rats].

Wei Sheng Yan Jiu 2006 Jan;35(1):49-51

Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science & Technology, Wuhan 430030, China.

Objective: To study the plasma concentration of peptide YY3 - 36 (PYY3-36) and the expression levels of PYY mRNA of ileum and colon in dietary induced obesity (DIO) and dietary induced obesity resistant (DIO-R) rats and the relation between PYY3-36 and DIO-R rats.

Methods: Thirty-six female SD rats were randomly divided into high-fat diet group (n = 27) and chow fed control group (n = 9), after 13 weeks of either a high-fat diet or chew fed diet, the high-fat diet group was subdivided into DIO and DIO-R group according to the final body weight. Weight gain, caloric intake, the concentration of PYY3-36 and the expression levels of PYY mRNA were measured and compared.

Results: The total caloric intake of DIO-R rats was lower than DIO rats (P < 0.01), while no significant difference was found between DIO-R and control rats (P > 0.05). The concentration of PYY3-36 and the expressions of PYY mRNA of ileum and colon in DIO-R rats were higher significantly than that of the DIO and control rats (P < 0.01), while no significant difference was found between DIO and control group (P > 0.05), except that PYY mRNA of ileum was advanced in DIO group (P < 0.01).

Conclusion: On the High-fat diet, SD rats showed different susceptibility to obese and energy intake, increased levels of PYY3-36 and PYY mRNA might be related to dietary induced obesity resistant.
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January 2006

Interaction of dietary composition and PYY gene expression in diet-induced obesity in rats.

J Huazhong Univ Sci Technolog Med Sci 2005 ;25(3):243-6

Department of Nutrition and Food hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.

The interaction of high-fat diet and the peptide YY (PYY) gene expression in diet-induced obesity and the mechanisms which predisposed some individuals to become obese on high-fat diet were explored. Thirty-six male SD rats were randomly divided into high-fat diet group (n=27) and chow fed control group (n=9). After 15 weeks of either a high-fat diet or chew fed diet, the high-fat diet group was subdivided into dietary induced obesity (DIO) and dietary induced obesity resistant (DIR) group according to the final body weight. Then the DIO rats were subdivided into two groups for a 8-week secondary dietary intervention. One of the group was switched to chew fed diet, whereas the other DIO and DIR rats continued on the initial high-fat diet. Weight gain and food intake were measured, food efficiency was calculated, and the concentrations of plasma neuropeptide Y (NPY) and PYY were assayed. Hypothalamic NPY mRNA expression and PYY mRNA expression in ileum and colon was detected by RT-PCR. The results showed that at the end of 15th week, the levels of body weight and caloric intake were significantly higher in DIO group than in DIR or control group (P<0. 01), while no significant difference was found between DIR and control group (P>0.05). The concentration of plasma PYY was significantly higher in DIR group than in DIO and CF group, while no significant difference was found between DIO and CF group (P <0.01). After switching the DIO rats to chow fed diet, their body weight gains were significantly lower than that of the DIO-HF group. The expression of PYY mRNA was increased in DIO-HF/ CF rats than in DIO-HF rats, and the expression of hypothalamic NPY mRNA was decreased in DIO-HF/CF rats than in DIO-HF group. It was concluded that both dietary composition and PYY gene expression could potently alter the hypothalamic NPY expression and result in different susceptibility to obese and overeating. The decreased PYY was associated with the increased NPY expression and their predisposal to obese and overeating in rats.
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http://dx.doi.org/10.1007/BF02828131DOI Listing
October 2007

[Effect of flavonoids of ginkgo biloba on anti-oxidizing system of mice after acute alcohol administration].

Wei Sheng Yan Jiu 2005 May;34(3):303-6

School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.

Objective: To investigate the protective effects of flavonoids of ginkgo biloba on anti-oxidizing system damaged by acute alcohol administration.

Methods: Adult male Kunming mice were employed and divided into randomly flavonoid intervention group, normal control and ethanol control group according to body weight. After pretreated with flavonoids of ginkgo biloba (96mg/kg bw), the mice in flavonoid intervention group ingested alcohol (ethanol 4.8g/kg bw) via i.g. and were decapitated after 0.5, 1, 2, 4, 6, 9, and 15 h of ethanol administration. The same treatment was carried out on ethanol control group except that physiological saline was applied instead of flavonoid of ginkgo biloba. Meanwhile, the normal control group was established.

Results: The concentration of glutathione (GSH), malondialdehyde (MDA) and the activity of glutathione peroxidase (GSH-Px), superoxide dismutase (SOD) in the serum and liver were determined. The experiment displays that the content of GSH and the activities of GSH-Px and SOD decreased rapidly after 1 h of treatment with alcohol and dropped to the lowest level at 4h of treatment. After 6h of treatment, these indexes came to the normal level rapidly. The level of MDA of serum and liver increased rapidly after 1 h of treatment and reached the climax at 4h and 6h respectively. It went back to the normal concentration until 15h and 9 h respectively. On a whole, there were similar curves between flavonoids intervention group and alcohol control group on the indexes. However, to some extent, the supplement of flavonoid of ginkgo biloba can prohibit the rise of MDA level and the decline of GSH-Px, SOD, GSH which were induced by acute alcohol intakes.

Conclusion: Flavonoid of ginkgo biloba have some protective effects on the damage of anti-oxidizing system of mice induced by acute alcohol adminstration.
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May 2005
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