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- W2284292766 abstract "Intraperitoneal injection of prostaglandin E1 (PGE) produces a transient hypothermia in rats that lasts 1-2 h. Rats exposed to an ambient temperature (Ta) of 26 degrees C displayed a decrease in rectal temperature (Tre) of 0.95 +/- 0.12 degrees C (SE) after injection with PGE (100 micrograms/kg ip). Hypothermia was produced mainly by heat losses, as indicated by increases in tail blood flow. At Ta of 4 degrees C, PGE produced a comparable fall in Tre of 1.00 +/- 0.14 degrees C. However, in the cold the hypothermia was caused solely by decreases in heat production. These results indicate that the PGE-induced hypothermia is not the result of a peripheral vasodilation induced by the direct action of PGE on the tail vascular smooth muscle but is a central nervous system-mediated response of the thermoregulatory system induced by PGE within the peritoneal cavity. Capsaicin injected subcutaneously induces a transient hypothermia in rats because of stimulation of the warm receptors. If administered peripherally in sufficient amounts, it is reputed to impair peripheral warm receptors so that they become desensitized to the hypothermic effects of capsaicin. We measured PGE-induced hypothermias in rats both before and after capsaicin desensitization at Ta of 26 degrees C. Before desensitization the hypothermia was -1.14 +/- 0.12 degrees C, whereas after capsaicin treatment the PGE-induced hypothermia was -0.34 +/- 0.17 degrees C. The biological effects of capsaicin are diverse; however, based on current thinking about the thermoregulatory effects of capsaicin desensitization, our results indicate that peripheral warm receptor pathways are in some manner implicated in the hypothermia induced by intraperitoneal PGE." @default.
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- W2284292766 date "1990-06-01" @default.
- W2284292766 modified "2023-10-16" @default.
- W2284292766 title "Effects of cold and capsaicin desensitization on prostaglandin E hypothermia in rats" @default.
- W2284292766 doi "https://doi.org/10.1152/jappl.1990.68.6.2618" @default.
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