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National Institute of Environmental Health Sciences

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Publication Detail

Title: Rapid activation of poly(ADP-ribose) polymerase contributes to Sindbis virus and staurosporine-induced apoptotic cell death.

Authors: Nargi-Aizenman, Jennifer L; Simbulan-Rosenthal, Cynthia M; Kelly, Tara A; Smulson, Mark E; Griffin, Diane E

Published In Virology, (2002 Feb 01)

Abstract: Poly(ADP-ribose) polymerase-1 (PARP-1) is a chromatin-associated enzyme that is activated by DNA strand breaks and catalyzes the transfer of ADP-ribose groups from NAD to itself and other nuclear proteins. Although caspase-mediated PARP-1 cleavage occurs during almost all forms of apoptosis, the contribution of PARP-1 activation and cleavage to this cell death process remains unclear. Using immortalized fibroblasts from wild-type (PARP-1(+/+)) and PARP-1 knockout (PARP-1(-/-)) mice, and a mouse neuroblastoma cell line (N18), the role that poly(ADP-ribosyl)ation plays in Sindbis virus (SV)-induced apoptosis was examined. Robust PARP-1 activation occurred in SV-infected cells prior to morphologic changes associated with apoptotic cell death and PARP-1 activity ceased simultaneously with caspase-3 activation and PARP-1 proteolysis. PARP-1 activity was maximal before detectable DNA fragmentation, but was absent when DNA damage was most intense. SV and staurosporine-induced cell death was delayed in fibroblasts lacking PARP-1 activity, suggesting that PARP-1 activation contributes to apoptotic cell death induced by these stimuli. SV replication was not affected by lack of PARP-1 activity, but DNA fragmentation and caspase-3 activation were delayed and occurred at lower levels in PARP-1-deficient fibroblasts. Early virus-induced PARP-1 activation may represent a novel way by which cells signal to the nucleus to regulate protein function by poly(ADP-ribosyl)ation in response to virus infection.

PubMed ID: 11853409 Exiting the NIEHS site

MeSH Terms: Animals; Apoptosis/drug effects*; Caspase 3; Caspases/metabolism; Cells, Cultured; DNA Fragmentation; Enzyme Activation; Enzyme Inhibitors/pharmacology*; Mice; Poly(ADP-ribose) Polymerases/physiology*; Sindbis Virus/physiology*; Staurosporine/pharmacology*; Virus Replication

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