Effect of acute exposure to cold on the levels of corticosterone and pituitary hormones in plasma collected from free conscious cannulated rats.

Takeuchi, Akira; Kajihara, Akio; Suzuki, Mitsuo

doi:10.1507/endocrj1954.24.109

Cited by 12 publications

(2 citation statements)

References 12 publications

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“…Takeuclii el al. [49] demonstrated a gradual but not significant decrease in plasma prolactin in ani mals chronically implanted with arterial cannula during the first hour of exposure to 2 C in a cold room.…”

Section: Discussionmentioning

confidence: 90%

Specific Hormonal and Neurochemical Responses to Different Stressors

et al. 1980

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The neuroendocrine and neurochemical responses of rats to 5 min of cold exposure versus 5 min of forced immobilization were determined and compared. We found that plasma hormones and brain neurochemical systems responded differently to the two different stressors. Plasma prolactin levels were elevated over 10-fold in the immobilized group, while rising only 2-fold in the cold stress group. Levels of corticosterone were significantly increased and growth hormone levels were decreased in both stressed groups as compared to controls. Levels of cyclic GMP were markedly elevated in 11 brain regions following cold exposure. Surprisingly, no elevation of cyclic GMP was found after forced immobilization. Cyclic AMP, norepinephrine. and dopamine levels throughout the 17 regions of brain examined showed no significant response to 5 min of either stressor. Lesions of the ventral medial tegmental area did not affect the cyclic GMP or neuroendocrine responses to cold stress. Lesion of the nucleus locus ceruleus did not affect regional cyclic GMP response but significantly reduced growth hormone levels in the cold-stressed rats.

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Section: Discussionmentioning

confidence: 90%

Specific Hormonal and Neurochemical Responses to Different Stressors

et al. 1980

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“…TSH levels in plasma were measured by radioimmunoassay (RIA) using materials distributed by that Rat Pituitary Hormone Program of NIAMDD, as described previously [22]. The concen tration of the hormone was expressed in nanograms per milliliter in terms of the RP-2 standard.…”

Section: Methodsmentioning

confidence: 99%

Thyrotropin Response to Thyrotropin-Releasing Hormone in Rats with Hypothalamic Knife Cuts

Ishikawa¹,

Inoue²,

Kakegawa³

et al. 1987

Neuroendocrinology

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Regulation of the pituitary-thyroid axis in rats with hypothalamic knife cuts has been studied. Complete hypothalamic deafferentation, either limited to the median eminence and the arcuate nucleus, or including parts of the dorsomedial nucleus and the whole ventromedial nucleus caused an increase in thyrotopin (TSH)-releasing hormone (TRH)-induced TSH secretion. Using an immunocytochemical procedure, a few TRH-positive fibers were observed within the median eminence of the larger island, while almost no fibers were identified in the smaller island. The exaggerated TSH response to TRH appeared within 3 days after the surgery and lasted for at least 1 week, when blood thyroxine (T4) level was significantly lowered. Exogenously injected T4 could inhibit such responses of TSH in the deafferented rats in a dose-related manner. These results support the hypothesis that the increase in the TSH response to TRH following hypothalamic deafferentation is due, at least in part, to the lowered thyroid hormone level in the blood.

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Acute cold‐ and chronic heat‐exposure upregulate hepatic leptin and muscle uncoupling protein (UCP) gene expression in broiler chickens

Dridi

Temim²,

Derouet³

et al. 2008

J. Exp. Zool.

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Emerging evidence showed that variations in environmental temperature affect both leptin and uncoupling protein (UCP) gene expression in mammals, whereas a little is known about such interactions in birds. Thus, we conducted the present study to investigate the influence of acute (2 hours) cold (4 degrees C) and chronic (10 days) heat (32 degrees C) exposure on hepatic leptin and muscle UCP gene expression in 5-wk-old broiler chickens. Both cold- and heat-exposure significantly (P < 0.05 to P < 0.001) upregulated hepatic leptin (by 35 and 46%, respectively) and muscle UCP mRNA levels (by 71 and 71%, respectively) compared to the thermoneutrality (22 degrees C). This result suggests that leptin and UCP may be involved in the thermoregulation response of chickens to extreme climate (cold and hot temperatures). The upregulation of hepatic leptin gene expression was accompanied by an increase in plasma leptin levels, indicating that leptin may be regulated at transcriptional level. The increase of leptin and UCP mRNA abundance, and leptinemia we report here were not related to plasma glucose or insulin levels. In conclusion, the exposure of broiler chickens to extreme ambient temperatures (cold and heat) increases hepatic leptin and muscle UCP gene expression.

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Effect of acute exposure to cold on the levels of corticosterone and pituitary hormones in plasma collected from free conscious cannulated rats.

Cited by 12 publications

References 12 publications

Specific Hormonal and Neurochemical Responses to Different Stressors

Specific Hormonal and Neurochemical Responses to Different Stressors

Thyrotropin Response to Thyrotropin-Releasing Hormone in Rats with Hypothalamic Knife Cuts

Acute cold‐ and chronic heat‐exposure upregulate hepatic leptin and muscle uncoupling protein (UCP) gene expression in broiler chickens

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