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Noradrenaline modulates hemocyte reactive oxygen species production via -adrenergic receptors in the oyster Crassostrea gigas


, : Noradrenaline modulates hemocyte reactive oxygen species production via -adrenergic receptors in the oyster Crassostrea gigas. Developmental and Comparative Immunology ; 25(4): 285-289

Catecholamines (CA) are known to be present in the microenvironment of molluscan immunocytes. In the present study, experiments were conducted to determine the effects of noradrenaline (NA), the principal CA circulating in bivalve hemolymph, on the luminol-dependent chemiluminescence (CL) of oyster Crassostrea gigas hemocytes. Results show that NA had a dose-dependent inhibitory effect on the CL-response at the physiological concentration of 0.1 [mu]M and above. The [alpha]-adrenoceptor agonist phenylephrine had no significant effect on the CL-response whereas the [beta]-adrenoceptor agonist isoproterenol mimicked the inhibitory effects of NA on the CL-response. The [beta]-adrenoceptor antagonist propanolol, but not the [alpha]-adrenoceptor antagonist prazosin, prevented the negative effects of NA on the CL-response. Taken together, these results show that [beta]-adrenergic receptors are present at the surface of oyster hemocytes and allow NA to down-regulate the CL-response.

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DOI: 10.1016/s0145-305x(00)00067-7


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