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. 1991 Apr;65(4):1829–1835. doi: 10.1128/jvi.65.4.1829-1835.1991

Down regulation of poliovirus receptor RNA in HeLa cells resistant to poliovirus infection.

G Kaplan 1, V R Racaniello 1
PMCID: PMC239992  PMID: 1705991

Abstract

A line of HeLa cells (SOFIA) was previously isolated that is resistant to poliovirus infection and does not express functional virus binding sites at the cell surface. The expression of the poliovirus receptor (PVR) gene in SOFIA cells was examined to determine the molecular basis for the failure of these cells to express PVRs. Southern blot analysis of genomic DNA revealed that the PVR gene in SOFIA cells did not contain gross alterations. However, PVR transcripts were not detected in Northern (RNA) blot analysis of SOFIA cell RNA. In vitro nuclear run-on analysis showed that transcription of PVR-specific RNA was reduced in SOFIA cells. Treatment of SOFIA cells with 5-azacytidine restored susceptibility to poliovirus infection, which correlated with the appearance of PVRs at the cell surface, as detected with anti-PVR monoclonal antibody D171. PVR RNA was detected in clones derived from 5-azacytidine-treated SOFIA cells. SOFIA cells were converted to poliovirus sensitivity at a rate of 5 to 7%, suggesting that down regulation of PVR expression involved few cellular targets. Resistance of SOFIA cells to poliovirus infection therefore appears to result from down regulation of PVR RNA, leading to lack of PVR expression at the cell surface. Methylation may play a role in regulating the expression of the PVR gene, which is not essential for survival of HeLa cells.

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