| Change in central kinin B2 receptor density after exercise training in rats. | |
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MedLine Citation:
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PMID: 20637711 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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Cardiovascular responses elicited by the stimulation of kinin B2 receptors in the IV cerebral ventricle, paratrigeminal nucleus or in the thoracic spinal cord are similar to those observed during an exercise bout. Considering that the kalikrein-kinin system (KKS) could act on the cardiovascular modulation during behavioral responses as physical exercise or stress, this study evaluated the central B2 receptor densities of Wistar (W) and spontaneously hypertensive rats (SHR) after chronic moderate exercise. Animals were exercise-trained for ten weeks on a treadmill. Afterwards, systolic blood pressure decreased in both trained strains. Animals were killed and the medulla and spinal cord extracted for B2 receptor autoradiography. Trained animals were compared to their sedentary controls. Sedentary groups showed specific binding sites for Hoe-140 (fmol/mg of tissue) in laminas 1 and 2 of the spinal cord, nucleus of the solitary tract (NTS), area postrema (AP), spinal trigeminal tract (sp5) and paratrigeminal nucleus (Pa5). In trained W a significant increase (p<0.05) in specific binding was observed in the Pa5 (31.3%) and NTS (28.2%). Trained SHR showed a significant decrease in receptor density in lamina 2 (21.9%) of the thoracic spinal cord and an increase in specific binding in Pa5 (36.1%). We suggest that in the medulla, chronic exercise could hyper stimulate the KKS enhancing their efficiency through the increase of B2 receptor density, involving this receptor in central cardiovascular control during exercise or stress. In the lamina 2, B2 receptor might be involved in the exercise-induced hypotension. |
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Authors:
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Ariadiny Lima Caetano; Tania Araujo Viel; Maria Fernanda Queiroz Prado Bittencourt; Mariana Silva Araujo; Katia De Angelis; Hudson Sousa Buck |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-07-15 |
Journal Detail:
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Title: Autonomic neuroscience : basic & clinical Volume: 158 ISSN: 1872-7484 ISO Abbreviation: Auton Neurosci Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2010-11-09 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100909359 Medline TA: Auton Neurosci Country: Netherlands |
Other Details:
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Languages: eng Pagination: 71-8 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier B.V. All rights reserved. |
Affiliation:
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Department of Physiological Sciences, Faculdade de Ciências Médicas da Santa Casa de São Paulo, Sao Paulo, SP, Brazil. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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