Abstract
Pretreatment of AT3 rat prostatic carcinoma cells expressing the inhibitor of apoptosis bcl-2 (AT3-bcl-2 cells) with alpha interferon (IFN-alpha) affected replication of a virulent strain of Sindbis virus (SV) but did not protect against virus-induced cell death. Treatment of cells with IFN-alpha late during infection affected ongoing SV replication very little. Previous studies have shown that cross-linking of the viral glycoprotein E2 with antibody delays the inhibition of K+ influx by improving the function of Na+K+ATPase and the Na(+)-K(+)-2Cl-cotransport system in SV-infected cells (P. Després, J. W. Griffin, and D. E. Griffin, J. Virol. 69:7006-7014, 1995). In these studies, we have shown that treatment of infected cells with anti-E2 monoclonal antibody also restored the ability of IFN-alpha to induce antiviral activity in infected cells late during infection. The very low rate of virus release in SV-infected cells treated simultaneously with anti-E2 monoclonal antibody and IFN-alpha was postulated to be linked to inhibition of virus maturation. Synergistic effects of antibody and IFN-alpha are likely to be important for control of SV replication in vivo.
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