DAO 67:141-147 (2005)  -  doi:10.3354/dao067141

In vitro research of anti-HSV-1 activity in different extracts from Pacific oysters Crassostrea gigas

Cécile Olicard1,2,3, Yohann Didier2, Christel Marty1, Nathalie Bourgougnon1,Tristan Renault2,*

1Laboratoire de Biotechnologie et Chimie Marines, EA 2594, Université de Bretagne Sud, Campus de Tohannic,Centre de recherche Yves Coppens, 56017 Vannes, France
2IFREMER, Laboratoire de Génétique et Pathologie, 17390 La Tremblade, France
3Laboratoire de Biologie et Environnement Marins, Université de La Rochelle, 17042 La Rochelle, France
*Corresponding author. Email:

ABSTRACT: Mortalities related to the detection of Ostreid Herpesvirus 1 (OsHV-1) have been previously reported in France among larvae and spat of the Pacific oyster Crassostrea gigas. Adult oysters appear less sensitive to herpesvirus infections, although OsHV-1 has been detected in adults without signs of disease or mortality. This suggests that the virus is able to persist in its host and that adult oysters may be able to control OsHV-1 infection. Little is known about antiviral substances in invertebrates. The present work concerns the research of antiviral substances in adult oyster C. gigas, where putative antiviral activities were monitored using 3 strategies: (1) in metabolites with variable polarity, (2) in peptidic extracts and (3) in crude haemolymph. In vitro antiviral assays were based on inhibition of Herpes simplex virus type 1 (HSV-1) replication in Vero cell monolayers. All extracts presented no cytotoxicity. Antiviral activity was detected in the fresh filtered haemolymph (EC50:425 µg ml–1) and seasonal variation of the haemolymph antiviral activity was monitored.

KEY WORDS: Oyster · Crassostrea gigas · Antiviral defence · OsHV-1 · HSV-1 · Antiviral peptides · Haemolymph

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