Vagotomy does not affect thermal responsiveness to intrabrain prostaglandin E2 and cholecystokinin octapeptide

Brain Res. 1999 Oct 9;844(1-2):157-63. doi: 10.1016/s0006-8993(99)01918-6.

Abstract

Subdiaphragmatic vagotomy has been repeatedly shown to attenuate the febrile response to peripherally injected pyrogens. In the present study, we investigated whether vagotomy-induced attenuation of febrile responsiveness reflects a decreased sensitivity of the brain to central fever mediators, prostaglandin E2 (PGE2) and cholecystokinin octapeptide (CCK-8). Male rats were subjected to subdiaphragmatic vagotomy (or sham surgery) on day 0 and had a cannula implanted into the lateral cerebral ventricle on day 24. On day 30-36, the thermal responsiveness of the rats to PGE2 or CCK-8 was tested. Each animal was injected in the ventricle with either PGE2 (0, 10, 100, or 500 ng) in pyrogen-free saline with 0.5% ethanol (5 microl) or CCK-8 (0 or 1.6 microg) in artificial cerebro-spinal fluid (5 microl). While the 0-dose of either PGE2 or CCK-8 (vehicle alone) induced no thermal response, all the higher doses of either agent caused a body temperature rise preceded by tail skin vasoconstriction. The vagotomized rats did not respond differently than their sham-operated counterparts to any dose of either drug. It is concluded that subdiaphragmatic vagotomy does not change the rat's thermal responsiveness to intrabrain PGE(2) and CCK-8.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Body Temperature Regulation / physiology*
  • Dinoprostone*
  • Dose-Response Relationship, Drug
  • Fever / chemically induced
  • Fever / physiopathology*
  • Injections, Intraventricular
  • Male
  • Pyrogens*
  • Rats
  • Rats, Wistar
  • Sincalide*
  • Vagotomy*
  • Vagus Nerve / physiology
  • Vagus Nerve / surgery
  • Vasoconstriction / physiology

Substances

  • Pyrogens
  • Dinoprostone
  • Sincalide