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Am J Physiol Regul Integr Comp Physiol 293: R1438-R1443, 2007. First published July 11, 2007; doi:10.1152/ajpregu.00259.2007
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SLEEP AND TEMPERATURE REGULATION

Moderate hypothermia induces a preferential increase in pancreatic islet blood flow in anesthetized rats

Michael Hultström, Leif Jansson, Birgitta Bodin, and Örjan Källskog

Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden

Submitted 17 April 2007 ; accepted in final form 11 July 2007

The aim of the study was to characterize the effects of induced moderate hypothermia on splanchnic blood flow, with particular reference to that of the pancreas and the islets of Langerhans. We also investigated how interference with the autonomic nervous system at different levels influenced the blood perfusion during hypothermia. For this purpose, hypothermia (body temperature of 28°C) was induced by external cooling, whereas normothermic (37.5°C) anesthetized Sprague-Dawley rats were used as controls. Some rats were pretreated with either propranolol, yohimbine, atropine, hexamethonium, or a bilateral abdominal vagotomy. Our findings suggest that moderate hypothermia elicits complex, organ-specific circulatory changes, with increased perfusion noted in the pylorus, as well as the whole pancreas and the pancreatic islets. The pancreatic islets maintain their high blood perfusion through mechanisms involving both sympathetic and parasympathetic mediators, whereas the increased pyloric blood flow is mediated through parasympathetic mechanisms. Renal blood flow was decreased, and this can be prevented by ganglionic blockade and is also influenced by beta-adrenoceptors.

pancreatic blood flow; renal blood flow; intestinal blood flow; adrenal blood flow


Addressfor reprint requests and other correspondence: M. Hultström, Renal Research Group, Institute of Medicine, Haukeland Univ. Hospital, N-5021 Bergen, Norway (e-mail: michael.hultstrom{at}med.uib.no)






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