Noradrenaline modulates oyster hemocyte phagocytosis via a beta-adrenergic receptor-cAMP signaling pathway.
Gen Comp Endocrinol
; 122(3): 252-9, 2001 Jun.
Article
en En
| MEDLINE
| ID: mdl-11356037
ABSTRACT
Catecholamines (CA) regulate several physiological processes in molluscs. Experiments have been conducted to determine the effects of noradrenaline (NA), the principal CA circulating in bivalve hemolymph, on oyster hemocytephagocytosis. Results show that NA had a dose-dependent inhibitory effect on phagocytosis at physiological concentrations of 0.1 microM and above. The beta-adrenoceptor agonist isoproterenol mimicked the inhibitory effects of NA on phagocytosis, whereas the alpha-adrenoceptor agonist phenylephrine had no significant effect. Furthermore, the beta-adrenoceptor antagonist propanolol, but not the alpha-adrenoceptor antagonist prazosin, prevented the inhibition of phagocytosis by NA. The type IV phosphodiesterase inhibitor rolipram acted synergistically with a suboptimal concentration of isoproterenol to inhibit phagocytosis, and the protein kinase A inhibitor H-89, but not the protein kinase C inhibitor calphostin C, attenuated the effect of isoproterenol. These results show that NA can modulate oyster hemocyte phagocytosis via a beta-adrenergic receptor/cAMP/protein kinase A signaling pathway.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Ostreidae
/
Fagocitosis
/
Sulfonamidas
/
Transducción de Señal
/
Norepinefrina
/
Receptores Adrenérgicos beta
/
AMP Cíclico
/
Hemocitos
Límite:
Animals
Idioma:
En
Revista:
Gen Comp Endocrinol
Año:
2001
Tipo del documento:
Article
País de afiliación:
Francia