| Thermoregulatory responses of tailed and tailless rats to isoproterenol. | |
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MedLine Citation:
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PMID: 7296383 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Colonic temperatures were measured in tailed and tailless rats at an ambient temperature (Ta) of 26 degrees C prior to and following administration of isoproterenol, a beta-adrenergic agonist, at doses of 0, 12.5, 25.0, 50.0, and 100.0 micrograms.kg-1. There was no significant difference between the colonic temperatures of tailed and tailless rats before drug injection. However, mean colonic temperature of tailless rats increased to a maximal level approximately 0.3 degrees higher than that of tailed rats after injection of 25.0, 50.0, and 100.0 micrograms isoproterenol per kilogram. The duration of the hyperthermic response was 50-60 min longer in tailless than tailed rats after administration of 50 and 100 micrograms isoproterenol per kilogram. The rate of oxygen consumption (heat production) increased by 4.5 mL.min-1.kg-0.75 in both tailed and tailless rats after administration of 50 micrograms isoproterenol per kilogram, the only dose tested. Mean colonic temperature of tailless rats was significantly higher, by 0.2-0.5 degrees than that of tailed rats during the initial 60 min of exposure to Ta 36 degrees C and during the first 40 min following removal from Ta 40 degrees C to Ta 28 degrees C. These results suggest that the tail of the rat is required for short-term maintenance of colonic temperature during both external and internal heat stresses. |
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Authors:
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D E Spiers; C C Barney; M J Fregly |
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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: Canadian journal of physiology and pharmacology Volume: 59 ISSN: 0008-4212 ISO Abbreviation: Can. J. Physiol. Pharmacol. Publication Date: 1981 Aug |
Date Detail:
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Created Date: 1982-01-09 Completed Date: 1982-01-09 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0372712 Medline TA: Can J Physiol Pharmacol Country: CANADA |
Other Details:
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Languages: eng Pagination: 847-52 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Body Temperature Regulation / drug effects* Hot Temperature Isoproterenol / pharmacology* Kinetics Male Oxygen Consumption / drug effects Rats Rats, Inbred Strains Tail / blood supply, physiology* Time Factors |
| Grant Support | |
ID/Acronym/Agency:
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AM-07164-05/AM/NIADDK NIH HHS; HL 14526-09/HL/NHLBI NIH HHS |
| Chemical | |
Reg. No./Substance:
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7683-59-2/Isoproterenol |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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