Ischemic acute renal failure in the rat: Protective effect of uninephrectomy

T. A. Fried, A. Hishida, J. L. Barnes, J. H. Stein

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36 Scopus citations

Abstract

Experiments were performed to investigate the effect 2-wk prior nephrectomy has on the recovery from a 40-min renal artery occlusion. Two groups were initially examined. Group 1 animals underwent sham nephrectomy and group 2 animals right nephrectomy 14 days prior to a 40-min left renal artery clamp. The percent recovery of inulin clearance in group 2 (33 ± 6%) was not significantly different from that in the group 1 (36 ± 8%) when measured 3 h after reflow. At 24 and 48 h of reflow, however, group 2 animals had a significantly higher percent recovery of inulin clearance (24 h: 31 ± 5%; 48 h: 50 ± 11%) than group 1 animals (24 h: 1 ± 1%; 48 h: 8 ± 4%). Similarly the histology was better preserved at 24 and 48 h in group 2. To further investigate this enhanced recovery, three additional groups were studied. Group 3 underwent right nephrectomy at the time of renal artery occlusion. Group 4 had right ureterovenostomies created immediately prior to the ischemic insult, and group 5 had their aortas rather than left renal arteries clamped. Each group shared with group 2, ischemia to all functioning excretory tissue. The percent recovery of inulin clearance in group 3 (48 ± 9%), group 4 (54 ± 5%), and group 5 (42 ± 6%) were each significantly (P < 0.005) higher than in group 1 (8 ± 4%) when measured at 48 h. We conclude that the protection offered by uninephrectomy is not a consequence of hypertrophy but that alterations in the environment which follow ischemia to all functioning excretory renal tissue are responsible for the enhanced recovery seen.

Original languageEnglish (US)
Pages (from-to)F568-F574
JournalAmerican Journal of Physiology - Renal Fluid and Electrolyte Physiology
Volume16
Issue number4
StatePublished - Jan 1 1984

ASJC Scopus subject areas

  • Physiology

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