Journal article
Thermoregulatory role of periventricular tissue surrounding the anteroventral third ventricle (AV3V) during acute heat stress in the rat
Clinical and experimental pharmacology & physiology, Vol.32(5-6), pp.457-461
05/2005
DOI: 10.1111/j.1440-1681.2005.04211.x
PMID: 15854158
Abstract
1. Thermoregulatory effector mechanisms are strongly influenced by hydration status. Dehydration delays the onset of evaporative heat loss and the redistribution of cardiac output in response to elevations in core temperature, yet very little is known about how and where thermal and non-thermal information is integrated. 2. The anteroventral third ventricular (AV3V) region encompasses several distinct neural structures, including the organum vasculosum of the lamina terminalis, the median preoptic nucleus, the preoptic periventricular nucleus and the medial aspects of the medial preoptic nucleus. In addition to its well-documented role in body fluid and cardiovascular homeostasis, recent anatomical and in vitro evidence has indicated the AV3V region may also be pivotal in the integration of thermal and osmotic information. 3. Electrolytic lesions of the AV3V region produce a markedly reduced thermal tolerance in rats. Elevations in mean arterial pressure, heart rate and mesenteric resistance were all attenuated in the AV3V-lesioned animals in response to a heat stress; however, hindquarter resistance was unaffected. Heat-induced salivation was also attenuated, severely reducing the ability of rats to lose heat via evaporation. 4. The AV3V region clearly has a functional role in thermoregulation, as well as cardiovascular and body fluid homeostasis. These data add further support to the hypothesis that thermal and non-thermal information may be integrated within this region.
Details
- Title: Subtitle
- Thermoregulatory role of periventricular tissue surrounding the anteroventral third ventricle (AV3V) during acute heat stress in the rat
- Creators
- Douglas G Whyte - Department of Physiology and Biophysics, University of Iowa, Iowa City, Iowa 52242-1407, USAAlan Kim Johnson
- Resource Type
- Journal article
- Publication Details
- Clinical and experimental pharmacology & physiology, Vol.32(5-6), pp.457-461
- DOI
- 10.1111/j.1440-1681.2005.04211.x
- PMID
- 15854158
- ISSN
- 0305-1870
- eISSN
- 1440-1681
- Grant note
- HL-14388 / NHLBI NIH HHS HL-57472 / NHLBI NIH HHS
- Language
- English
- Date published
- 05/2005
- Academic Unit
- Psychological and Brain Sciences; Neuroscience and Pharmacology; Health and Human Physiology
- Record Identifier
- 9984213421302771
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