| Gonadectomy in the spring reinstates hibernation in male golden-mantled ground squirrels. | |
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MedLine Citation:
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PMID: 8764289 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We tested the hypothesis that continued secretion of gonadal steroids is necessary to suppress hibernation in male golden-mantled ground squirrels in the weeks after the terminal arousal in spring. Juvenile and adult males were gonadectomized or sham gonadectomized 1 wk after the terminal arousal; 64% of castrated and none of the shamcastrated animals resumed hibernation. Latency to resumption of torpor was 9 +/- 2 days from the time of castration, and squirrels underwent 4.3 +/- 0.9 bouts before permanently regaining euthermia. Among squirrels that resumed hibernation, bout duration was significantly shorter and torpor was shallower after castration. Castration as late as 3 wk after the terminal arousal reinstated hibernation. We suggest that the terminal arousal of male squirrels in the spring is provoked by a steroid-independent mechanism similar to that operating earlier in the hibernation season; abandonment of hibernation is contingent on concomitant sustained increases in androgen secretion during the first few weeks of euthermia. |
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Authors:
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J Dark; D R Miller; I Zucker |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: The American journal of physiology Volume: 270 ISSN: 0002-9513 ISO Abbreviation: Am. J. Physiol. Publication Date: 1996 Jun |
Date Detail:
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Created Date: 1996-09-19 Completed Date: 1996-09-19 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0370511 Medline TA: Am J Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: R1240-3 Citation Subset: IM |
Affiliation:
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Department of Psychology, University of California, Berkeley 94720, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Aging
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physiology Animals Castration* Hibernation* Male Reaction Time Sciuridae / physiology* Seasons* |
| Grant Support | |
ID/Acronym/Agency:
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HD 14595/HD/NICHD NIH HHS; WS 30816//PHS HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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