Journal article
Beta-2 Adrenoceptor Mediated Vasodilation: Role in Cardiovascular Responses to Acute Stressors in Spontaneously Hypertensive Rats
Clinical and experimental hypertension (1993), Vol.A13(5), pp.1059-1068
1991
DOI: 10.3109/10641969109042112
PMID: 1663432
Abstract
The present paper summarizes our studies on the role of beta-2 adrenoceptor mediated vasodilatory mechanisms in the cardiovascular defense response of spontaneously hypertensive rats (SHR) and presents new data on the contribution of altered vascular responsiveness to vasodilators. SHR had similar blood pressure but exaggerated plasma norepinephrine (NE) and epinephrine (EPI) responses compared to their normotensive control strain, the Wistar-Kyoto (WKY), while the plasma catecholamine response of the first generation (F1) cross was intermediate. An examination of regional blood flow changes to footshock stress indicated that SHR compared to WKY had greater increases in mesenteric vascular resistance that appeared to be offset by more pronounced decreases in hindquarter vascular resistance. Blockade of beta-2 adrenoceptors, which are densely located in the skeletal muscle vasculature, led to greatly increased pressor responses to stress in SHR but was without effect in WKY. Results of our current work indicate that this response is due to increased stimulation of the beta-2 adrenoceptors during stress rather than to increased vascular reactivity. These results indicate that in SHR relative to WKY, the exaggerated sympatho-adrenal response to stress does not produce greater blood pressure responses because of the offsetting influences upon vasodilation and vasoconstriction.
Details
- Title: Subtitle
- Beta-2 Adrenoceptor Mediated Vasodilation: Role in Cardiovascular Responses to Acute Stressors in Spontaneously Hypertensive Rats
- Creators
- Robert F Kirby - 1Department of Psychology, Pharmacology, Statistics, The University of Iowa, Iowa City, IA, 52242Carrol H Woodworth - 1Department of Psychology, Pharmacology, Statistics, The University of Iowa, Iowa City, IA, 52242George G Woodworch - 2Cardiovascular Center, The University of Iowa, Iowa City, IA, 52242Alan Kim Johnson - 1Department of Psychology, Pharmacology, Statistics, The University of Iowa, Iowa City, IA, 52242
- Resource Type
- Journal article
- Publication Details
- Clinical and experimental hypertension (1993), Vol.A13(5), pp.1059-1068
- Publisher
- Informa UK Ltd
- DOI
- 10.3109/10641969109042112
- PMID
- 1663432
- ISSN
- 1064-1963
- eISSN
- 1525-6006
- Language
- English
- Date published
- 1991
- Academic Unit
- Psychological and Brain Sciences; Neuroscience and Pharmacology; University College Courses; Health and Human Physiology
- Record Identifier
- 9984213428902771
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