Formation of cowpox virus-specific cell surface antigen (CPV S-ag) was enhanced in HVJ (Sendai virus) carrier cells compared to that in parent cells. Temperature shifts from 32 to 35 to 37 °C for these carrier cultures reduced this enhancing activity, making them equivalent to parent cells. The eclipse phase and one-step growth of CPV in the carrier cells were shorter than in normal cells. Extracts of carrier cells exhibited a stimulating activity causing the temporary rise and subsequent lowering of CPV infectivity in their reactions with CPV , suggesting a cellular acceleration of CPV uncoating. The S-ag forming ability of these carrier cells did not decrease as much as that of parent cells in the presence of actinomycin D or puromycin. The results indicate that persistent infection with HVJ, especially the temperature-sensitive variant, promotes the first step of intracellular growth of CPV, resulting in enhanced formation of S-ag.


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