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• W1995205631 abstract "Neovascularization may be necessary for better and longer function of transplanted islets. Vascular endothelial growth factor (VEGF) is known to be one of the most important factors of angiogenesis. Recently, VEGF was reported to be expressed in islets of normal pancreas. We studied the expression of VEGF and neovascularization related peptides in transplanted islets. To determine the angiogenic microcapillary, immunochemical staining was performed for Factor VIII-related antigen (von Willebrand factor [vWF]) and platelet endothelial cell adhesion molecule-1/CD31 (PECAM-1), both of which are known as markers of the angiogenic microvessel. Transplantable islets were isolated from Lewis rats (8-10 weeks of age) by discontinuous dextran gradient after collagenase digestion. Seven to twelve hundred islets were injected into the portal vein (IPV group, n = 7) or transplanted into subnephrocapsular cavity (SNC, n = 12) of the same descent rats. In the IPV group, the liver was resected 1 hour, 1 week, or 4 weeks after transplantation (Tx). In the SNC group, the kidney was resected 1, 3, 7, or 28 days after Tx. Each tissue was fixed in formaldehyde and embedded in paraffin. Serial 4-microm slices were immunostained for insulin, VEGF, PECAM-1, or vWF using specific antibodies. In IPV group, insulin-positive cells were VEGF positive as were in the normal pancreas at all time points. Islets of 1 hour after Tx were barely PECAM-1 positive as were in normal pancreas, but islets became weakly stained at 7 and 28 days after Tx. In vWF staining, transplanted islets showed stronger staining than those in the normal pancreas. In SNC group, VEGF was also stained in insulin-positive cells at 1, 3, 7, and 28 days. In PECAM-1 staining, islets of 1 day after Tx were barely stained as were in normal pancreas. However, the staining was increasingly enhanced from 3 to 7 days and then appeared weakened at 28 days after Tx. In vWF staining, islets were always vWF positive, as was seen in IPV group. This study revealed that PECAM-1 appeared in islets after islet Tx, suggesting that neovascularization occurs within the islet grafts. On the other hand, VEGF of transplanted islet did not obviously vary with time. Enhancement of the neovascularization may lead to better results of islet Tx." @default.
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• W1995205631 date "2000-08-01" @default.
• W1995205631 modified "2023-10-17" @default.
• W1995205631 title "Immunohistochemical Studies on Vascular Endothelial Growth Factor and Platelet Endothelial Cell Adhesion Molecule-1/CD-31 in Islet Transplantation" @default.
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• W1995205631 doi "https://doi.org/10.1097/00006676-200008000-00010" @default.
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