Effect of Exposure to Cold on Hypothalamic TRH Activity and Plasma Levels of TSH and Prolactin in the Rat
作者:
M. Jobin,
Louise Ferland,
J. Côté,
F. Labrie,
期刊:
Neuroendocrinology
(Karger Available online 1975)
卷期:
Volume 18,
issue 2
页码: 204-212
ISSN:0028-3835
年代: 1975
DOI:10.1159/000122399
出版商: S. Karger AG
关键词: TRH;PRL;TSH;Cold exposure;Thyroxine;Corticosterone
数据来源: Karger
摘要:
No significant change in hypothalamic TRH content was found in rats during acute (5–240 min) exposure to cold (5 °C), in spite of rapid and sustained elevations in plasma TSH and thyroxine. Plasma PRL rose markedly in the first 15 min, but returned to normal thereafter. Chronic exposure to cold (32 days) was characterized by elevated plasma and pituitary levels of both TSH and PRL in the presence of an unaltered hypothalamic TRH content. If increased TRH release from the hypothalamus occurs during exposure to cold, as suggested by the pituitary-thyroid stimulation, either it is compensated for by an equal rise in synthesis, or the extra amount released is negligible in comparison with the hypothalamic content of TRH. The acute PRL response to exposure to cold may be related to an acute TRH release but could also result from the accompanying stress response acting by a mechanism independent of T
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