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- W2144187890 endingPage "763" @default.
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- W2144187890 abstract "Endogenous pancreatic islets have a dense glomerular-like angioarchitecture, which ensures an optimal delivery of oxygen and nutrients to the islet cells, provides signals from other cells in the body and disposes secreted hormones. Transplantation of isolated islets means that their vascular connection is interrupted. The islet grafts therefore depend upon endothelial cells and microvessels originating in the implantation organ for derivation of a new vascular system. A re-establishment of islet blood-flow occurs within 7–14 days after transplantation, mainly through vascular sprouting. The newly formed blood vessels acquire the morphological characteristics of those in endogenous islets. In intraportally transplanted islets to the liver, the islets become revascularized almost exclusively from tributaries to the hepatic artery. Exocrine contamination of the transplanted islets could hamper the revascularization process, whereas neither cryopreservation nor immunosuppressive drugs like cyclosporin, prednisolon and RS-61443 have any essential effects on the angiogenesis. Investigators have noticed improvements in islet graft survival and function by means of basic fibroblast growth factor (bFGF), acidic FGF and endothelial cell growth factor exposure of the grafts. The functional properties of transplanted islets are largely unknown, but evidence from experimental islet transplantation suggests that both the blood perfusion and the tissue oxygen tension of the grafted islets are chronically decreased, indicating an insufficient vascular system. In order to achieve optimal condition for survival and function of transplanted beta cells, it is important to ascertain whether impairments in vascular function are present also after clinical islet transplantations as well." @default.
- W2144187890 created "2016-06-24" @default.
- W2144187890 creator A5039853407 @default.
- W2144187890 creator A5055228817 @default.
- W2144187890 date "2002-05-15" @default.
- W2144187890 modified "2023-10-18" @default.
- W2144187890 title "Graft vascular function after transplantation of pancreatic islets" @default.
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