Journal
VIROLOGY
Volume 322, Issue 2, Pages 220-230Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.virol.2004.02.006
Keywords
red sea bream iridovirus; apoptosis; cytopathic effect; affinity labeling; active caspases; caspase-3 inhibitor (Z-DEVD-FMK); caspase-6 inhibitor (Z-VEID-FMK); grunt fin cell line
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Red sea bream iridovirus (RSIV) of the Iridoviridae family is a causative agent of lethal infections in many cultured marine fish species in southwestern Japan. RSIV-induced apoptosis was divided as follows: (1) cell shrinkage and rounding at the early apoptotic stage, (2) cell enlargement at the middle apoptotic stage, (3) formation of apoptotic body-like vesicles at the late apoptotic stage and phagocytosis by neighboring cells, and (4) loss of membrane integrity in apoptotic body-like vesicles without phagocytosis by neighboring cells. By affinity labeling, RSIV-induced apoptosis included caspase-dependent apoptosis. RSIV infection caused cell rounding but not cell enlargement or formation of apoptotic body-like vesicles and further restricted part of the structural protein synthesis in the presence of caspase-3 and -6 inhibitors. These findings showed the involvement of caspase-3 and -6 in the morphological changes at the middle and late apoptotic stages and viral protein synthesis in the late stage of RSIV infection. (C) 2004 Elsevier Inc. All rights reserved.
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