Inhibitory effect of adrenomedullin on L-type calcium currents in guinea-pig ventricular myocytes / 生理学报
Acta Physiologica Sinica
;
(6): 479-484, 2002.
Article
Dans Anglais
| WPRIM
| ID: wpr-318964
ABSTRACT
The effects of adrenomedullin (ADM) on the L-type calcium currents (I(Ca,L)) and the mechanism of the signal transduction process were studied. Enzymatically isolated guinea-pig ventricular myocytes were used to measure ICa,L with whole-cell patch-clamp techniques. ADM at the concentrations of 1-100 nmol/L decreased ICa,L in a dose-dependent manner (P<0.05). ADM22-52) (100 nmol/L), a specific ADM-receptor antagonist, completely abolished the ADM-induced inhibition of ICa,L. Pretreatment of the cells with H-89 (10 micromol/L), a specific PKA inhibitor, did not attenuate the effects of ADM. Intracellular application of 10 micromol/L PKC19-36), a specific PKC inhibitor, prevented the ADM-induced inhibition of the ICa,L, while the specific PKC activator PMA could mimic the effects of ADM on the ICa,L. PMA (1 micromol/L) decreased the ICa,L by 32.26+/-4.20%(P<0.05). These findings indicate that ADM can inhibit the ICa,L in guinea-pig ventricular myocytes, and the inhibition is mediated by the specific ADM-receptor and an activation of protein kinase C.
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Pharmacologie
/
Protéine kinase C
/
Techniques de patch-clamp
/
Canaux calciques de type L
/
Biologie cellulaire
/
Myocytes cardiaques
/
Adrénomédulline
/
Cochons d'Inde
/
Ventricules cardiaques
/
Métabolisme
Limites du sujet:
Animaux
langue:
Anglais
Texte intégral:
Acta Physiologica Sinica
Année:
2002
Type:
Article
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