Journal Article

The kidney during hibernation and arousal from hibernation. A natural model of organ preservation during cold ischaemia and reperfusion

Carlo Zancanaro, Manuela Malatesta, Ferdinando Mannello, Peter Vogel and Stanislav Fakan

in Nephrology Dialysis Transplantation

Published on behalf of European Renal Association - European Dialysis and Transplant Assoc

Volume 14, issue 8, pages 1982-1990
Published in print August 1999 | ISSN: 0931-0509
Published online August 1999 | e-ISSN: 1460-2385 | DOI: http://dx.doi.org/10.1093/ndt/14.8.1982
The kidney during hibernation and arousal from hibernation. A natural model of organ preservation during cold ischaemia and reperfusion

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Background. During hibernation the kidney is in a hypothermic condition where renal blood flow is minimal and urine production is much reduced. Periodical arousal from hibernation is associated with kidney reperfusion at increasing body temperature, and restored urine production rate.

Methods. To assess the degree of structural preservation during such extreme conditions, the kidney cortex was investigated by means of electron microscopy in the dormouse Muscardinus avellanarius during winter hibernation, arousal from hibernation and the summer active period.

Results. Results show that the fine structure of the kidney cortex is well preserved during hibernation. In the renal corpuscle, a sign of slight lesion was the focal presence of oedematous endothelial cells and/or podocytes. Proximal convoluted tubule cells showed fully preserved ultrastructure and polarity, and hypertrophic apical endocytic apparatus. Structural changes were associated with increased plasma electrolytes, creatinine and urea nitrogen, and proteinuria. During the process of arousal the fine structure of the kidney cortex was also well maintained.

Conclusion. These results demonstrate that dormice are able to fully preserve kidney cortex structure under extreme conditions resembling e.g. severe ischaemia or hypothermic organ storage for transplantation, and reperfusion. Elucidation of the mechanisms involved in such a natural model of organ preservation could be relevant to human medicine.

Keywords: hibernation; kidney; preservation; rodent; ultrastructure

Journal Article.  3813 words.  Illustrated.

Subjects: Nephrology

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