Publications by authors named "Kousuke Sasaki"

17 Publications

  • Page 1 of 1

Free flap reconstruction of Achilles tendon and overlying skin defect using ALT and TFL fabricated chimeric flap.

Case Reports Plast Surg Hand Surg 2019 4;6(1):82-85. Epub 2019 Jul 4.

Department of Plastic and Reconstructive Surgery, Iwate Medical University Hospital, Morioka, Japan.

A 33-year-old man developed a left Achilles tendon rupture and skin necrosis. We reconstructed the defect using an anterolateral thigh flap and a tensor fasciae lata muscle flap in a chimeric fashion. he was able to stand on a toe of the operated foot without help 6 months postoperatively.
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http://dx.doi.org/10.1080/23320885.2019.1635023DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6609348PMC
July 2019

Analysis of cancer-associated fibroblasts and the epithelial-mesenchymal transition in cutaneous basal cell carcinoma, squamous cell carcinoma, and malignant melanoma.

Hum Pathol 2018 09 16;79:1-8. Epub 2018 Mar 16.

Department of Plastic Surgery, School of Medicine, Iwate Medical University, Morioka 020-8505, Japan.

Activated cancer-associated fibroblasts (CAFs) and fibroblasts that have undergone the epithelial-mesenchymal transition (EMT) in cancer stroma contribute to tumor progression and metastasis. However, no reports have investigated the CAF phenotype and its clinicopathological relevance in cutaneous malignant tumors, including basal cell carcinoma (BCC), squamous cell carcinoma (SCC), and malignant melanoma (MM). Here, we investigated the CAF phenotype in cutaneous malignant tumors based on their histology and immunohistochemical expression of CAF-related markers, including adipocyte enhancer-binding protein 1 (AEBP1), podoplanin, platelet-derived growth factor receptor α (PDGFRα), PDGFRβ, fibroblast activating protein (FAP), CD10, S100A4, α-smooth muscle actin (α-SMA), and EMT-related markers (Zeb1, Slug, and Twist). In addition, we assessed the role of the CAF phenotype in cutaneous malignant cancers using hierarchical cluster analysis. Consequently, 3 subgroups were stratified based on the expression pattern of CAF- and EMT-related markers. Subgroup 1 was characterized by low expression of AEBP1, PDGFRα, PDGFRβ, FAP and Slug, whereas subgroup 2 was closely associated with high expression of PDGFRβ, S100A4 and Twist. In addition, high expression levels of podoplanin, PDGFRβ, CD10, S100A4, α-SMA, Zeb1, Slug and Twist were observed in subgroup 3. High expression of CD10 was commonly found in all 3 subgroups. These subgroups were correlated with histologic subtypes, that is, subgroup 1, MM; subgroup 2, BCC; and subgroup 3, SCC. We suggest that the expression pattern of CAF- and EMT-related proteins plays crucial roles in the progression of BCC, SCC, and MM.
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http://dx.doi.org/10.1016/j.humpath.2018.03.006DOI Listing
September 2018

Corrective Osteotomy of Malunited Diaphyseal Fractures of the Forearm Simplified Using 3-Dimensional CT Data: Proposal of Our Simple Strategy Through Case Presentation.

Hand (N Y) 2017 09 8;12(5):NP95-NP98. Epub 2017 Mar 8.

4 Mahidol University, Salaya, Thailand.

Background: Reconstruction of malunited diaphyseal fractures of the forearm is one of the most difficult treatments due to its complicated structure. Widespread usage of Digital Imaging and Communications in Medicine (DICOM) data of 3-dimensional (3D) computed tomography (CT) and 3D printing can make estimating the true plane of the deformity easy.

Methods: A 21-year-old man with limited supination due to left forearm nonunion deformity initially treated by locking plate fixation was referred to our hospital. We evaluated the deformity by superimposing the mirror image bone model of the contralateral normal bone onto a model of the affected bone and 3D real full-scale bone model.

Results: The patient underwent a manual corrective osteotomy according to our planning. He had satisfactory improvement of his symptoms with no complications.

Conclusions: We postulated that our simple preoperative simulation and manual osteotomy with the aid of 3D CT reconstruction and 3D real full-scale bone model fit in the clinical practice as a recent trend.
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http://dx.doi.org/10.1177/1558944717692087DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5684942PMC
September 2017

Surgical Strategy and Techniques for Low-Profile Dorsal Plating in Treating Dorsally Displaced Unstable Distal Radius Fractures.

J Wrist Surg 2017 May 19;6(2):163-169. Epub 2016 Oct 19.

Hand and Microsurgery Unit, Department of Orthopedics, Mahidol University, Salaya, Thailand.

 The low-profile dorsal locking plating (DLP) technique is useful for treating dorsally comminuted intra-articular distal radius fractures; however, due to the complications associated with DLP, the technique is not widely used.  A retrospective review of 24 consecutive cases treated with DLP were done.  All cases were classified into two types by surgical strategy according to the fracture pattern. In type 1, there is a volar fracture line distal to the watershed line in the dorsally displaced fragment, and this type is treated by H-framed DLP. In type 2, the displaced dorsal die-punch fragment is associated with a minimally displaced styloid shearing fracture or a transverse volar fracture line. We found that the die-punch fragment was reduced by the buttress effect of small l-shaped DLP after stabilization of the styloid shearing for the volar segment by cannulated screws from radial styloid processes. At 6 months after surgery, outcomes were good or excellent based on the modified Mayo wrist scores with no serious complications except one case. The mean range of motion of each type was as follows: the palmar flexion was 50, 65 degrees, dorsiflexion was 70, 75 degrees, supination was 85, 85 degrees, and pronation was 80, 80 degrees; in type 1 and 2, respectively.  DLP is a useful technique for the treatment of selected cases of dorsally displaced, comminuted intra-articular fractures of the distal radius with careful soft tissue coverage.
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http://dx.doi.org/10.1055/s-0036-1593763DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5397302PMC
May 2017

Avulsion Fracture of the Tibial Tuberosity Requiring Meniscal Repair: A Case Report.

Fukuoka Igaku Zasshi 2015 Jun;106(6):206-11

Avulsion fractures of the tibial tuberosity are uncommon injuries. A 16-year-old male sustained injuries to his right knee joint after jumping from stairs and landed on his feet with his right knee forced into flexion. X-ray photographs showed a type III avulsion fracture of the tibial tuberosity. On the next day of the injury, open reduction and internal fixation, followed by arthroscopy was performed. The fracture fragment was fixed with three 5.0mm cannulated cancellous screws. The torn anterior portion of medial meniscus was repaired with 3-0 Polydioxanone (PDS) using outside-in sutures and the torn midportion of medial meniscus was repaired using the FasT-Fix meniscal repair system. Eight months after the injury, removal of the screws and arthroscopy were undertaken. The medial meniscus was completely healed. The range of motion was full at the knee joint. Meniscal suture should be strongly considered for type III avulsion fractures of the tibial tuberosity in adolescents.
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June 2015

[Effect of tolvaptan on ascites due to malignancy].

Gan To Kagaku Ryoho 2015 Feb;42(2):201-5

Dept. of Gastroenterology and Surgery, Narashino Daiichi Hospital.

Ascites accompanying a malignancy is often refractory to conventional treatment with saline diuretics, making it difficult to control. We administered a new diuretic, Tolvaptan, to 10 individuals with malignancy and heart failure accompanied by ascites, which was refractory to saline diuretics, and assessed its efficacy and adverse events. We observed a significant reduction in abdominal distension following 2 weeks of Tolvaptan administration. However, we also observed significant increases in serum potassium, urea nitrogen, and creatinine levels, but no serious adverse events. This suggests that Tolvaptan may also be effective as treatment for ascites.
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February 2015

Green tea epigallocatechin gallate exhibits anticancer effect in human pancreatic carcinoma cells via the inhibition of both focal adhesion kinase and insulin-like growth factor-I receptor.

J Biomed Biotechnol 2010 26;2010:290516. Epub 2011 Jan 26.

Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, Tokyo, Japan.

The exact molecular mechanism by which epigallocatechin gallate (EGCG) suppresses human pancreatic cancer cell proliferation is unclear. We show here that EGCG-treated pancreatic cancer cells AsPC-1 and BxPC-3 decrease cell adhesion ability on micro-pattern dots, accompanied by dephosphorylations of both focal adhesion kinase (FAK) and insulin-like growth factor-1 receptor (IGF-1R) whereas retained the activations of mitogen-activated protein kinase and mammalian target of rapamycin. The growth of AsPC-1 and BxPC-3 cells can be significantly suppressed by EGCG treatment alone in a dose-dependent manner. At a dose of 100 μM which completely abolishes activations of FAK and IGF-1R, EGCG suppresses more than 50% of cell proliferation without evidence of apoptosis analyzed by PARP cleavage. Finally, the MEK1/2 inhibitor U0126 enhances growth-suppressive effect of EGCG. Our data suggests that blocking FAK and IGF-1R by EGCG could prove valuable for targeted therapy, which can be used in combination with other therapies, for pancreatic cancer.
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http://dx.doi.org/10.1155/2010/290516DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3034970PMC
May 2011

Venous hemodynamic alterations in lower limbs undergoing total joint arthroplasty.

Am J Orthop (Belle Mead NJ) 2009 Aug;38(8):E137-40

Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, Higashi-ku, Fukuoka, Japan.

Using duplex ultrasonography, we measured preoperative and postoperative venous flow volume in 32 operated lower limbs without deep vein thrombosis (DVT) after total hip arthroplasty (THA, n = 17) and total knee arthroplasty (TKA, n = 15). We also calculated percentage decrease in mean venous flow volume (MVFV) from before surgery to after surgery. Patients with a history of one of several venous diseases, congestive heart failure, or morbid obesity were excluded. In both groups (THA, TKA), MVFV 3 days after surgery and MVFV 1 week after surgery were significantly lower than preoperative MVFV, but MVFV at 2 or more weeks after surgery did not differ significantly from preoperative MVFV (result 1). Incidentally, the decrease in MVFV in the lower limbs was significantly larger 3 days after TKA than 3 days after THA (result 2). As venous stasis has a central role in thrombus formation, result 1 suggests that the risk for DVT initiation is low at 2 or more weeks after THA and TKA in patients with normal preoperative venous physiologic functions. Result 2 is probably correlated with the evidence that DVT incidence is higher after TKA than after THA.
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August 2009

Kinematic analysis of kneeling in cruciate-retaining and posterior-stabilized total knee arthroplasties.

J Orthop Res 2008 Apr;26(4):435-42

Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.

Kneeling is an important function of the knee for many activities of daily living. In this study, we evaluated the in vivo kinematics of kneeling after total knee arthroplasty (TKA) using radiographic based image-matching techniques. Kneeling from 90 to 120 degrees of knee flexion produced a posterior femoral rollback after both cruciate-retaining and posterior-stabilized TKA. It could be assumed that the posterior cruciate ligament and the post-cam mechanism were functioning. The posterior-stabilized TKA design had contact regions located far posterior on the tibial insert in comparison to the cruciate-retaining TKA. Specifically, the lateral femoral condyle in posterior-stabilized TKA translated to the posterior edge of the tibial surface, although there was no finding of subluxation. After posterior-stabilized TKA, the contact position of the post-cam translated to the posterior medial corner of the post with external rotation of the femoral component. Because edge loading can induce accelerated polyethylene wear, the configuration of the post-cam mechanism should be designed to provide a larger contact area when the femoral component rotates.
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http://dx.doi.org/10.1002/jor.20512DOI Listing
April 2008

Unusual anterior radial head dislocation associated with transposed biceps tendon: a case report.

J Shoulder Elbow Surg 2006 Nov-Dec;15(6):e15-9. Epub 2006 Jul 27.

Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.

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http://dx.doi.org/10.1016/j.jse.2005.08.021DOI Listing
December 2006

Effect of x-ray tube current on the accuracy of cerebral perfusion parameters obtained by CT perfusion studies.

Phys Med Biol 2005 Nov 12;50(21):5019-29. Epub 2005 Oct 12.

Department of Medical Physics and Engineering, Graduate School of Medicine, Osaka University, 1-7 Yamadaoka, Suita, Osaka 565-0871, Japan.

The purpose of this study was to investigate the effect of x-ray tube current on the accuracy of cerebral perfusion parameters obtained by CT perfusion studies using multi-detector row CT (MDCT). Following the standard CT perfusion study protocol, continuous (cine) scans (1 s/rotation x 60 s) consisting of four 5 mm thick contiguous slices were performed using an MDCT scanner with a tube voltage of 80 kVp and a tube current of 200 mA. We generated the simulated images with tube currents of 50 mA, 100 mA and 150 mA by adding the corresponding noise to the raw scan data of the original image acquired above using a noise simulation tool. From the original and simulated images, we generated the functional images of cerebral blood flow (CBF), cerebral blood volume (CBV) and mean transit time (MTT) in seven patients with cerebrovascular disease, and compared the correlation coefficients (CCs) between the perfusion parameter values obtained from the original and simulated images. The coefficients of variation (CVs) in the white matter were also compared. The CC values deteriorated with decreasing tube current. There was a significant difference between 50 mA and 100 mA for all perfusion parameters. The CV values increased with decreasing tube current. There were significant differences between 50 mA and 100 mA and between 100 mA and 150 mA for CBF. For CBV and MTT, there was also a significant difference between 150 mA and 200 mA. This study will be useful for understanding the effect of x-ray tube current on the accuracy of cerebral perfusion parameters obtained by CT perfusion studies using MDCT, and for selecting the tube current.
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http://dx.doi.org/10.1088/0031-9155/50/21/005DOI Listing
November 2005

Electron beam CT versus 16-MDCT on the variability of repeated coronary artery calcium measurements in a variable heart rate phantom.

AJR Am J Roentgenol 2005 Oct;185(4):995-1000

Department of Clinical Radiology, Hiroshima University Hospital, 1-2-3, Kasumi-cho, Minami-ku, Hiroshima 734-8551, Japan.

Objective: High reproducibility of coronary artery calcium (CAC) scoring is a key requirement for monitoring the progression of coronary atherosclerosis. The purposes of this study were to compare electron beam CT and 16-MDCT scanners in the variability of repeated CAC measurements and to assess the factors influencing this variability.

Materials And Methods: CAC models of different sizes attached to a cardiac phantom with a programmable variable heart rate were scanned three times, and interscan variability of the CAC measurement was calculated each time. For helical CT, different slice-thickness images of either retrospective ECG-gated or prospective ECG-triggering reconstruction were obtained. The detection of small amounts of calcium, variability of the Agatston score, and CAC measurement algorithms (Agatston, volume, and mass scores) were compared between CT scanners and protocols.

Results: All 1-mm-sized calcium models were detected on 0.625- and 1.25-mm helical CT, whereas some were missed on electron beam CT and 2.5-mm helical CT. Retrospective ECG-gated thin-slice helical CT showed the lowest variability. Reduction of variability by volume and mass scoring algorithms was less effective on 0.625- and 1.25-mm-thickness CT.

Conclusion: Retrospective ECG-gated thin-slice helical CT has the potential to be a useful tool for monitoring coronary atherosclerosis.
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http://dx.doi.org/10.2214/AJR.04.1057DOI Listing
October 2005

Electron beam CT versus 16-slice spiral CT: how accurately can we measure coronary artery calcium volume?

Eur Radiol 2006 Feb 21;16(2):374-80. Epub 2005 Sep 21.

Department of Clinical Radiology, Hiroshima University Hospital, 1-2-3, Kasumi-cho, Minami-ku, Hiroshima, 734-8551, Japan.

The purpose of this study was to investigate how accurately CAC volume we can be measured using electron beam computed tomography (CT) and 16-slice spiral CT. CAC models with known volume attached to a cardiac phantom were scanned. The error of measurement, variability between measured and real volumes, and inter-scan measurement variability were obtained. For spiral CT, seven different parameters were included: (1) slice thickness (0.625 mm, 1.25 mm and 2.5 mm), (2) retrospective spiral electrocardiograph (ECG)-gated or prospective axial ECG-triggering, (3) overlapping or non-overlapping. The error of measurement was 15% on electron beam CT and 8-20% on spiral CT. CAC volumes were underestimated in 92% and overestimated in 8% of the electron beam CT scans. Volumes were underestimated in 79%, correct in 5% and overestimated in 16% of the spiral CT scans. The best measurement and the least variability was observed on 0.625-mm retrospective spiral ECG-gated CT (error of 8%), a significant result (t-test: P<0.01) when compared with electron beam CT. CAC volume measurement on CT scanners may be significantly different and often underestimates the real volume of CAC. For precise evaluation of CAC volume, thin-slice retrospective spiral ECG-gated scan using a spiral CT scanner is desirable.
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http://dx.doi.org/10.1007/s00330-005-2904-9DOI Listing
February 2006

Simple screening method for deep vein thrombosis by duplex ultrasonography using patients' active maximum ankle dorsiflexion.

J Orthop Sci 2004 ;9(5):440-5

Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan.

We hypothesized that venous obstruction by deep vein thrombosis (DVT) only slightly augments venous outflow from lower limbs by active ankle movements. If our hypothesis is true, we thought that we could develop a new screening method for DVT using duplex ultrasonography. Subjects were 22 lower limbs of 11 patients who gave informed consent for venography after total hip or knee arthroplasty. Around postoperative 19.0 days (range 15-32 days), we measured the ratios, called flow ratios, of the peak flow signal with active maximum ankle dorsiflexion and that at rest using duplex ultrasonography in the bilateral femoral veins. On the same day, we then performed bilateral venography. Thrombosis was detected in 5 of the 22 lower limbs. The mean flow ratios with and without DVT were 1.18 (range 1.0-1.3) and 3.31 (range 1.8-4.8), respectively. The flow ratios with DVT were significantly lower than those without DVT. Pain or difficulty performing active maximum ankle dorsiflexion was not observed in any of the operated or unoperated lower limbs during the ultrasound examination. In conclusion, ultrasonographic measurement of flow ratios may become a simple screening method for DVT in lower limbs without the pain or difficulty of performing active maximum ankle dorsiflexion.
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http://dx.doi.org/10.1007/s00776-004-0813-4DOI Listing
February 2005

Efficient and practical method for synthesizing optically active indan-2-ols by the Ti(O-i-Pr)(4)/2 i-PrMgCl-mediated metalative Reppe reaction.

J Org Chem 2003 Jun;68(12):4980-3

Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan.

An efficient and practical synthesis of optically active indan-2-ols 1 has been developed starting from readily accessible optically active 4-siloxy-1,6-alkadiynes 2 and ethynyl p-tolyl sulfone, where the metalative Reppe reaction mediated by an economical divalent titanium reagent, Ti(O-i-Pr)(4)/2 i-PrMgCl, is a key step.
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http://dx.doi.org/10.1021/jo034391mDOI Listing
June 2003

Technical innovation of cardiac multirow detector CT using multisector reconstruction.

Comput Med Imaging Graph 2002 Jul-Aug;26(4):217-26

Department of Radiology, School of Medicine, Hiroshima University, 1-2-3, Kasumi-cho, Minami-ku, Hiroshima 734-8551, Japan.

Multisector reconstruction is a newly developed algorithm for multirow detector CT in cardiac study. Using volume data sets obtained by ECG-gated scanning, we can reconstruct cardiac images at any desired phase of the cardiac cycle retrospectively. In retro-processing multiplanar and three-dimensional images, thin-slice images with overlapping increment have a great advantage due to increasing z-axis resolution. In this article, we present principles of the algorithm, a phantom study, clinical applications and perspectives for the future.
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http://dx.doi.org/10.1016/s0895-6111(02)00010-1DOI Listing
September 2002

Hyperploidy induced by drugs that inhibit formation of microtubule promotes chromosome instability.

Genes Cells 2002 Feb;7(2):151-62

Department of Tumor Genetics and Biology, Kumamoto University School of Medicine, 2-2-1 Honjo, Kumamoto 860-0811, Japan.

Background: Antimicrotubule drugs (AMDs), such as taxol and vincristine, are the most important addition to the chemotherapeutic armamentarium against human cancers. It has been shown that prolonged AMD treatment induces hyperploidy in G1-checkpoint-defective cancer cells and that these hyperploid cells subsequently undergo apoptosis. However, a fraction of these hyperploid cells are able to survive the prolonged mitotic stress and resume cell-cycle progression.

Results: We established hyperploid clones that escaped from cell death after AMD treatment from two glioma cell lines, U251MG and U87MG. Subtractive comparative genomic hybridization (CGH) analysis revealed that clones derived from U87MG mainly had chromosome number changes, but that those from U251MG showed both numerical and structural chromosomal changes. Furthermore, numerous aberrations identified in U251MG clones were remarkably chromosome-specific, which may have been due to clonal selection for cells that have an advantage in growth and/or survival. All clones derived from both cell lines had abnormalities in chromosome segregation, and karyotypes of clones were more heterogeneous than those of parental cells, suggesting that cells having a higher chromosome number are subject to asymmetric chromosome segregation, resulting in a heterogeneous karyotype. All clones derived from U87MG and U251MG increased both centric and acentromeric micronuclei, suggesting the presence of chromosome structural abnormality.

Conclusions: AMD treatment induces hyperploid formation and chromosome instability in checkpoint-deficient cancer cells.
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http://dx.doi.org/10.1046/j.1356-9597.2001.00509.xDOI Listing
February 2002