Abstract
The natural killer (NK) cell activity of DBA/2J mice infected with the polycythemic variant of Friend leukemia virus (FLV-P) declines early after virus challenge, being non-detectable 2 weeks after FLV-P inoculation. Cells capable of suppressing the in vitro cytolytic activity of NK effector lymphocytes were detected in the spleen of infected mice. The mechanism of suppression could be based on cell-mediated impairment of NK effector function, or on antigenic competition from splenocytes expressing NK antigens elicited by FLV-P.
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