pH is decreased in transplanted rat pancreatic islets

Author:

Carlsson Per-Ola1,Nordin Astrid1,Palm Fredrik12

Affiliation:

1. Departments of Medical Cell Biology and

2. Diagnostic Radiology, Uppsala University, SE-751 23 Uppsala, Sweden

Abstract

Recent studies of transplanted pancreatic islets have indicated incomplete revascularization. We investigated the pH, in relation to oxygen tension (Po 2), in endogenous islets and islets syngeneically transplanted to the renal subcapsular site of nondiabetic and streptozotocin-diabetic recipients. Tissue pH and Po 2 were measured using microelectrodes. In the endogenous islets, tissue pH was similar to that in arterial blood. In the transplanted islets, tissue pH was 0.11–0.15 pH units lower. No differences in islet graft pH were seen between nondiabetic and diabetic animals, and none if the islet grafts were investigated 1 day or 1 mo posttransplantation. The Po 2 in the endogenous islets was ∼35 mmHg. Transplanted islets had a markedly lower tissue Po 2 both 1 day and 1 mo after transplantation. A negative correlation between the tissue Po 2 and the hydrogen ion concentration was seen in the 1-mo-old islet transplants in diabetic animals. In conclusion, decreased Po 2 in transplanted islets is associated with a decreased tissue pH, suggesting a shift toward more anaerobic glucose metabolism after transplantation.

Publisher

American Physiological Society

Subject

Physiology (medical),Physiology,Endocrinology, Diabetes and Metabolism

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