Angiotensin-II down-regulates cardiac natriuretic peptide receptor-A mediated anti-hypertrophic signaling in experimental rat hearts.
Indian J Exp Biol
;
2013 Jan; 51(1): 48-55
Article
Dans Anglais
| IMSEAR
| ID: sea-147567
ABSTRACT
Atrial natriuretic peptide (ANP) exerts anti-hypertrophic effects in the heart via natriuretic peptide receptor-A (NPR-A). However, ANP mediated anti-hypertrophic activity is decreased in the cardiomyopathic conditions. In the present investigation the in vivo effects of angiotensin II (Ang II), a hypertrophic agonist have been studied on the ventricular expression level of NPR-A in Wistar rat hearts. NPR-A expression at the protein and mRNA levels were found to be markedly reduced by 5-fold respectively in Ang II infused rats heart as compared with sham rat hearts. Moreover, cGMP production in response to ANP was reduced by 77% in the isolated cardiac membrane preparation from the Ang II infused rat hearts. Losartan treatment reversed NPR-A expression and responsiveness to ANP. This study suggests that Ang II down regulates cardiac NPR-A activity by suppressing Npr1 gene transcription.
Texte intégral:
Disponible
Indice:
IMSEAR (Asie du Sud-Est)
Sujet Principal:
Rats
/
Mâle
/
Angiotensine-II
/
Transduction du signal
/
Régulation négative
/
Régulation de l'expression des gènes
/
Facteur atrial natriurétique
/
Récepteur facteur natriurétique auriculaire
/
Rat Wistar
/
Hypertrophie ventriculaire gauche
Type d'étude:
Étude pronostique
langue:
Anglais
Texte intégral:
Indian J Exp Biol
Année:
2013
Type:
Article
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