Cardiovascular effects of angiotensin II in the rostral ventrolateral medulla: the push-pull hypothesis.
Curr Hypertens Rep
; 9(3): 222-7, 2007 Jun.
Article
em En
| MEDLINE
| ID: mdl-17519129
ABSTRACT
Neurons within the rostral ventrolateral medulla (RVLM) play a pivotal role in the tonic and phasic control of blood pressure. This region also contains a high density of angiotensin II type 1 (AT1) receptors. There is evidence that tonic activation of AT1 receptors in the RVLM contributes to an increased sympathetic vasomotor activity in some models of hypertension. At the same time, under certain conditions, activation of AT1 receptors in the RVLM can cause sympathoinhibition. In this review we argue that the effect of endogenous angiotensin II in the RVLM on sympathetic vasomotor activity depends upon the balance between tonic excitatory and inhibitory effects on sympathetic premotor neurons mediated by AT1 receptors within this region, and that this balance may be altered in different physiological or pathophysiological conditions.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Angiotensina II
/
Bulbo
/
Fenômenos Fisiológicos Cardiovasculares
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Curr Hypertens Rep
Assunto da revista:
ANGIOLOGIA
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Austrália
País de publicação:
EEUU
/
ESTADOS UNIDOS
/
ESTADOS UNIDOS DA AMERICA
/
EUA
/
UNITED STATES
/
UNITED STATES OF AMERICA
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US
/
USA