Protective effect of insulin on ischemic renal injury in diabetes mellitus

Kidney International
Jan MelinBengt Fellström

Abstract

An exceptional susceptibility to unilateral renal ischemia/reperfusion (I/R) injury resulting in inflammation, fibrosis, atrophy of the kidney, and end-stage renal disease (ESRD) has been demonstrated in the diabetic rat. The aim of this study was to examine whether insulin treatment would reduce I/R injury in diabetic kidneys. Diabetes mellitus (DM) was induced in male Wistar rats by streptozotocin. I/R was achieved by clamping the left renal artery for 30 minutes. Treatment with long acting insulin was started 7 to 14 days before or one day after I/R. Short acting insulin was administrated 2 to 6 hours before the injury. Apoptosis was evaluated six hours after ischemia with the TUNEL-method. Four weeks after the clamping inulin clearance was measured and kidneys were removed for histopathological evaluation. In DM animals renal I/R caused massive induction of apoptosis in the renal medulla after six hours as well as inflammation, fibrosis, renal atrophy and anuria within four weeks. Treatment with long acting insulin before I/R resulted in decreased cell death and an almost complete protection of both renal function and histomorphology. Treatment with short acting insulin before I/R also decreased the loss of renal function. ...Continue Reading

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Jan 4, 2013·American Journal of Physiology. Renal Physiology·Guofeng GaoW Brian Reeves
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