Measurements of oxygen tension in native and transplanted rat pancreatic islets

Diabetes
P O CarlssonL Jansson

Abstract

This study was performed to measure the oxygen tension before and after revascularization of pancreatic islets transplanted beneath the renal capsule and to investigate to what extent this was affected by acute and chronic hyperglycemia. In addition, the oxygen tension in islets within the pancreas was determined. PO2 was measured with a modified Clark electrode (tip 2-6 microm o.d.). Within native pancreatic islets, the mean PO2 was higher (31-37 mmHg) than within the exocrine pancreas (20-23 mmHg). The mean oxygen tension in the transplanted islets the day after implantation was half of that recorded in native islets (14-19 mmHg) and did not differ between normoglycemic and diabetic recipients. At 1 month after transplantation, when revascularization had occurred, the mean PO2 in the islet grafts was 9-15 mmHgf in normoglycemic animals but was lower (6-8 mmHg) in diabetic animals, whereas the blood perfusion of the transplants, as measured with laser-Doppler flowmetry (probe diameter 0.45 mm), was similar in both groups. The mean oxygen tension in the superficial renal cortex surrounding the implanted islets was similar in all groups and remained stable at 13-21 mmHg. Intravenous administration of D-glucose (1 g/kg) did not a...Continue Reading

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