Journal article
Lesions of the anteroventral third ventricle region (AV3V) disrupt cardiovascular responses to an elevation in core temperature
American journal of physiology. Regulatory, integrative and comparative physiology, Vol.288(6), pp.R1783-1790
06/2005
DOI: 10.1152/ajpregu.00524.2004
PMID: 15650127
Abstract
Blood flow is redistributed from the viscera to the periphery during periods of heat stress to maximize heat loss. The heat-induced redistribution of blood flow is strongly influenced by nonthermal inputs such as hydration status. At present, little is known about where thermal and nonthermal information is integrated to generate an appropriate effector response. Recently, the periventricular tissue that surrounds the anteroventral third ventricle (AV3V) has been implicated in the integration of thermal and osmotic information. The purpose of the present study was to determine the effects of electrolytic lesions of the AV3V on the cardiovascular response to a passive heat stress in unanesthetized, free-moving male Sprague-Dawley rats. Core temperature was elevated at a constant rate of approximately 0.03 degrees C/min in sham- and AV3V-lesion rats using an infrared heat lamp. Changes in mesenteric and hindquarter vascular resistance were determined using Doppler flow probes, and heat-induced salivation was estimated using the spit-print technique. The rise in mean arterial pressure (MAP), heart rate (HR), and mesenteric resistance in response to elevations in core temperature were all attenuated in AV3V-lesion rats; however, hindquarter resistance was unaffected. Heat-induced salivation was also diminished. In addition, AV3V-lesion rats were more affected by the novelty of the experimental environment, resulting in a higher basal core temperature, HR, and MAP. These results indicate that AV3V lesions disrupt the cardiovascular and salivatory response to a passive heat stress in rats and produce an exaggerated stress-induced fever triggered by a novel environment.
Details
- Title: Subtitle
- Lesions of the anteroventral third ventricle region (AV3V) disrupt cardiovascular responses to an elevation in core temperature
- Creators
- Douglas G Whyte - Department of Physiology and Biophysics, University of Iowa, 11 Seashore Hall E., Iowa City, IA 52242-1407, USAAlan Kim Johnson
- Resource Type
- Journal article
- Publication Details
- American journal of physiology. Regulatory, integrative and comparative physiology, Vol.288(6), pp.R1783-1790
- DOI
- 10.1152/ajpregu.00524.2004
- PMID
- 15650127
- ISSN
- 0363-6119
- eISSN
- 1522-1490
- Grant note
- HL-14388 / NHLBI NIH HHS HL-57472 / NHLBI NIH HHS
- Language
- English
- Date published
- 06/2005
- Academic Unit
- Psychological and Brain Sciences; Neuroscience and Pharmacology; Health and Human Physiology
- Record Identifier
- 9984213411302771
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