Journal article
AV3V lesions attenuate the cardiovascular responses produced by blood-borne excitatory amino acid analogs
American journal of physiology. Heart and circulatory physiology, Vol.276(5), pp.H1409-H1415
05/01/1999
DOI: 10.1152/ajpheart.1999.276.5.H1409
PMID: 10330222
Abstract
Systemic injections of the excitatory amino acid (EAA) analogs, kainic acid (KA) and N-methyl-d-aspartate (NMDA), produce a pressor response in conscious rats that is caused by a centrally mediated activation of sympathetic drive and the release of arginine vasopressin (AVP). This study tested the hypothesis that the tissue surrounding the anteroventral part of the third ventricle (AV3V) plays a role in the expression of the pressor responses produced by systemically injected EAA analogs. Specifically, we examined whether prior electrolytic ablation of the AV3V region would affect the pressor responses to KA and NMDA (1 mg/kg iv) in conscious rats. The KA-induced pressor response was smaller in AV3V-lesioned than in sham-lesioned rats (11 ± 2 vs. 29 ± 2 mmHg; P < 0.05). After ganglion blockade, KA produced a pressor response in sham-lesioned but not AV3V-lesioned rats (+27 ± 3 vs. +1 ± 2 mmHg; P < 0.05). The KA-induced pressor response in ganglion-blocked sham-lesioned rats was abolished by a vasopressin V1-receptor antagonist. Similar results were obtained with NMDA. The pressor response to AVP (10 ng/kg iv) was slightly smaller in AV3V-lesioned than in sham-lesioned ganglion-blocked rats (45 ± 3 vs. 57 ± 4 mmHg; P < 0.05). This study demonstrates that the pressor responses to systemically injected EAA analogs are smaller in AV3V-lesioned rats. The EAA analogs may produce pressor responses by stimulation of EAA receptors in the AV3V region, or the AV3V region may play an important role in the expression of these responses.
Details
- Title: Subtitle
- AV3V lesions attenuate the cardiovascular responses produced by blood-borne excitatory amino acid analogs
- Creators
- Erin J Whalen - Departments of Pharmacology and Psychology and Cardiovascular Center, University of Iowa, Iowa City, Iowa 52242Terry G Beltz - Departments of Pharmacology and Psychology and Cardiovascular Center, University of Iowa, Iowa City, Iowa 52242Stephen J Lewis - Departments of Pharmacology and Psychology and Cardiovascular Center, University of Iowa, Iowa City, Iowa 52242Alan Kim Johnson - Departments of Pharmacology and Psychology and Cardiovascular Center, University of Iowa, Iowa City, Iowa 52242
- Resource Type
- Journal article
- Publication Details
- American journal of physiology. Heart and circulatory physiology, Vol.276(5), pp.H1409-H1415
- DOI
- 10.1152/ajpheart.1999.276.5.H1409
- PMID
- 10330222
- NLM abbreviation
- Am J Physiol Heart Circ Physiol
- ISSN
- 0363-6135
- eISSN
- 1522-1539
- Language
- English
- Date published
- 05/01/1999
- Academic Unit
- Psychological and Brain Sciences; Neuroscience and Pharmacology; Health, Sport, and Human Physiology
- Record Identifier
- 9984214755902771
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