Poliovirus induces apoptosis in the human U937 promonocytic cell line - PubMed (original) (raw)
. 2000 Jul 5;272(2):250-6.
doi: 10.1006/viro.2000.0405.
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- PMID: 10873768
- DOI: 10.1006/viro.2000.0405
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Poliovirus induces apoptosis in the human U937 promonocytic cell line
J A López-Guerrero et al. Virology. 2000.
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Abstract
The human promonocytic U937 cell line, which is moderately susceptible to poliovirus infection, has been used to investigate the induction of apoptosis by this virus. Infection of U937 cells with poliovirus induces morphological changes typical of apoptosis. Poliovirus-resistant U937 cells (PRU) have been isolated that are resistant to apoptosis induced by poliovirus, but that undergo apoptosis after treatment with TNF plus cycloheximide. Despite the fact that poliovirus triggers nitric oxide production in U937 cells, the inhibitor of inducible nitric oxide (NO) synthase, N(omega)-monomethyl-l-arginine, did not hinder apoptosis after infection, suggesting that NO does not play a direct role in this process. Finally, poliovirus infection of U937 cells led to the cleavage of pro-caspase-3 and poly(ADP-ribose)polymerase, indicating the activation of the CPP32 ICE-like cysteine protease in the induction of apoptosis. Our findings suggest that cellular death takes place in U937 cells productively infected by poliovirus as a result of apoptosis and involves caspase activation.
Copyright 2000 Academic Press.
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