| Comparison between hypothalamic thermoresponsive neurons from duck and rat slices. | |
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MedLine Citation:
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PMID: 3627944 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Neuronal thermoresponsiveness in the preoptic and anterior hypothalamic (PO/AH) region of a bird and a mammal were compared in vitro by recording the activity of 48 units from ducks and 37 units from rats in tissue slices subjected to temperature changes. Warm-responsive units were found in similar proportions in duck and rat PO/AH slices. The average degrees of thermoresponsiveness did not differ between the two species. Neurons exhibiting thresholds of warm responsiveness had higher threshold temperatures (2P less than 0.01) in duck (38.8 +/- 0.2 degrees C) than in rat (37.4 +/- 0.4 degrees C) slices (means +/- standard errors). Firing rates at threshold temperatures and thermoresponsiveness below and above thresholds did not differ between ducks and rats. During synaptic blockade in a Ca2+-free/high-Mg2+ medium, warm-responsiveness was retained in 9 out of 13 units in duck slices and in 8 out of 13 units in rat slices. In two instances in ducks and in one case in rats positive temperature coefficients were converted into negative temperature coefficients. Among two cold-responsive units tested in duck slices one retained its cold-responsiveness. It is concluded that in vitro evaluation of PO/AH neuronal thermoresponsiveness in a bird and a mammal has not revealed differences at the single unit level which might explain the diverging contributions of the avian and mammalian hypothalamus to deep body temperature perception. |
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Authors:
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T Nakashima; F K Pierau; E Simon; T Hori |
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Publication Detail:
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Type: Comparative Study; In Vitro; Journal Article |
Journal Detail:
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Title: Pflügers Archiv : European journal of physiology Volume: 409 ISSN: 0031-6768 ISO Abbreviation: Pflugers Arch. Publication Date: 1987 Jul |
Date Detail:
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Created Date: 1987-10-08 Completed Date: 1987-10-08 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0154720 Medline TA: Pflugers Arch Country: GERMANY, WEST |
Other Details:
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Languages: eng Pagination: 236-43 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Action Potentials
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drug effects Animals Anterior Hypothalamic Nucleus / physiology* Calcium / physiology Ducks Magnesium / pharmacology Preoptic Area / physiology* Rats Rats, Inbred Strains Species Specificity Thermoreceptors / drug effects, physiology* |
| Chemical | |
Reg. No./Substance:
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7439-95-4/Magnesium; 7440-70-2/Calcium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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