Enhancive and suppressive effects of cytomegalovirus on human lymphocyte responses in vitro.
Virus-specific lymphocyte proliferation in the presence of cytomegalovirus (CMV) without and with monocytes was studied in healthy persons. Three categories of lymphocyte response could be distinguished: seropositive low responders, naturally high responders, and lymphocyte populations responding well to CMV antigen in the presence of added CMV-incubated autologous monocytes. This latter category could be identified by preincubating autologous monocytes with CMV. CMV-seronegative persons were nonresponders. Early CMV antigens were produced in monocytes but not in lymphocytes by all CMV isolates. Infection of monocytes as detected by antibody to early viral protein did not appear to abort the antigen-presenting ability. The virus-specific responding lymphocytes were mainly of the T4+ phenotype. In contrast, addition of CMV to polyclonal mitogens significantly suppressed total lymphocyte DNA synthesis. CMV thus may have an enhanced virus-specific stimulatory effect on lymphocytes together with monocytes but a suppressive effect on the total lymphocyte population.
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