TAILIEUCHUNG - Báo cáo khoa học: Oxidative stress and apoptotic events during thermal stress in the symbiotic sea anemone, Anemonia viridis

Symbiosis between cnidarian and photosynthetic protists is widely distri-buted over temperate and tropical seas. These symbioses can periodically breakdown, a phenomenon known as cnidarian bleaching. This event can be irreversible for some associations subjected to acute and⁄or prolonged envi-ronmental disturbances, and leads to the death of the animal host. | ễFEBS Journal Oxidative stress and apoptotic events during thermal stress in the symbiotic sea anemone Anemonia viridis Sophie Richier1 Cecile Sabourault1 Juliette Courtiade1 Nathalie Zucchini3 Denis Allemand1 2 and Paola Furla1 1 UMR 1112 UNSA-INRA ROSE Nice-Sophia Antipolis University Nice France 2 Centre Scientifique de Monaco Monaco 3 UMR 1112 UNSA-INRA ROSE Sophia-Antipolis France Keywords apoptosis bleaching caspase cnidarian oxidative stress Correspondence P. Fura UMR 1112 ROSE Nice-Sophia Antipolis University Parc Valrose BP 71 F-06108 Nice Cedex 2 France Fax 33 4 92 07 65 63 Tel 33 4 92 07 68 30 E-mail furla@ Received 6 April2006 revised 30 June 2006 accepted 11 July 2006 doi Symbiosis between cnidarian and photosynthetic protists is widely distributed over temperate and tropical seas. These symbioses can periodically breakdown a phenomenon known as cnidarian bleaching. This event can be irreversible for some associations subjected to acute and or prolonged environmental disturbances and leads to the death of the animal host. During bleaching oxidative stress has been described previously as acting at molecular level and apoptosis is suggested to be one of the mechanisms involved. We focused our study on the role of apoptosis in bleaching via oxidative stress in the association between the sea anemone Anemonia viridis and the dinoflagellates Symbiodinium species. Characterization of caspase-like enzymes were conducted at the biochemical and molecular level to confirm the presence of a caspase-dependent apoptotic phenomenon in the cnidarian host. We provide evidence of oxidative stress followed by induction of caspase-like activity in animal host cells after an elevated temperature stress suggesting the concomitant action of these components in bleaching. Over the past several decades symbiotic invertebrates such as cnidarians sponges and mollusks have been regularly affected by a phenomenon known as bleaching . This

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