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  • 1
    ISSN: 1432-0428
    Schlagwort(e): Insulin ; glucose ; glucose tolerance ; rat ; portal blood flow ; pancreatic transplantation ; pancreatic islets ; streptozotocin
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The effect on glucose metabolism of altering the site of the venous drainage of an isograft of isolated adult islets implanted beneath the renal capsule, from the systemic circulation to the portal circulation was determined in streptozotocin-induced diabetic rats. Reversal of diabetes was accomplished by the transplantation of 1000–1200 isolated islets beneath the left kidney capsule. The rate of fall of the glucose concentration (as expressed by the K value) was found to be significantly decreased in transplanted animals (1.7 ± 0.5%/min; mean ± SD) compared with normal animals (2.4 ± 0.5%/min). Draining the left renal vein into the portal circulation restored the K value to that of normal animals (2.5 ± 0.4%). However the fasting glucose concentration was significantly higher and the basal insulin levels lower in both normal and transplanted rats with a renoportal shunt.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    ISSN: 1432-0428
    Schlagwort(e): Hyperglycaemia ; islet transplantation ; diabetes ; rat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The effect of hyperglycaemia on islet transplantation in the rat has been examined in two ways, using syngeneic transplantation of 400 islets to the kidney capsule and subsequent measurement of kidney insulin content as a measurement of B-cell survival. Firstly, islets were transplanted into either diabetic or normal rats, then 6 months later the composite kidney/islet graft was transplanted into a normal rat. The insulin content was measured after a further 6 months and was found to be significantly reduced in islets exposed to hyperglycaemia in the primary recipient. These findings are interpreted as showing that long-term exposure of islets to hyperglycaemia results in B-cell loss. In the second experiment 400 islets were transplanted into either a long-term (6 months) diabetic or a normal rat. Two weeks later the composite kidney/islet graft was transplanted into a normal rat. The insulin content was measured after a further 6 months and no significant difference was found, whether the primary recipient was diabetic or not. These results are interpreted as showing that islet graft implantation is not impaired in long-term diabetic rats.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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