CD69 expression reliably predicts the anti-CD3-induced proliferative response of lymphocytes from human...

Published studies suggest that mitogenic responses of lymphocytes can be reliably assessed by monitoring the expression of lymphocyte surface CD69 after 24 h of culture with the stimulant. We tested this hypothesis by determining the ability of lymphocyte CD69 expression to predict the outcome (normal or abnormal) of lymphocyte proliferative responses to anti-CD3 in a group of human immunodeficiency virus type 1 (HIV-1)-infected patients (n = 47). Cutoff values for defining normal and abnormal CD69 expression and proliferative ([3H]thymidine incorporation) responses were established with lymphocytes from healthy uninfected controls (n = 20). Lymphocytes from 29 HIV-infected patients exhibited an abnormal proliferative response, and those from 25 of the 29 also exhibited abnormal CD69 expression (sensitivity, 86.2%). Similarly, lymphocytes from 18 HIV-infected patients exhibited a normal proliferative response, and those from 16 of the 18 also exhibited normal CD69 expression (specificity, 88.9%). The predictive value of a normal CD69 result was 80%, and the predictive value of an abnormal CD69 result was 92.6%. These findings demonstrate that HIV-1-associated impairments in lymphocyte activation can be reliably detected by the rapid and nonradioactive CD69 expression assay.