Suppressed Proliferative Response and Interleukin-2 Production in Hispanic HIV+ and AIDS T-cell Subsets

We find that interleukin-2 (IL-2) production is severely depressed (80-90%) in AIDS T-cells (CD4+ or CD8+) stimulated with anti-CD3 or Con A together with phorbol ester (PMA) or anti-CD28 coactivation. Likewise, the proliferative response of CD4+ T-cells was suppressed, from a mean of 24.6% (HIV+) to 59.1% (AIDS) for PMA with activators OKT3 (anti-CD3), Con A, enterotoxin B or pokeweed mitogen, and 20.2% (HIV+) to 77.8% (AIDS) with anti-CD28 co-activation. Similar degrees of suppression were found with the CD8+ T-cells except for a much greater suppression at the HIV+ stage with anti-CD28 (57.7%), approximately 2.5 times higher than for PMA coactivation. However, when proliferation was induced by the two coactivators combined (PMA plus anti-CD28), much less suppression was observed: 8.5% (HIV+) to 19.0% (AIDS) for CD4+ cells and 8.2% to 26.5%, respectively, for CD8+ cells. The data suggest that during HIV infection the CD28 pathway becomes most defective, but can be bypassed to some extent by the less-impaired PMA pathway. The IL-2 (+PMA) signal in HIV+ and AIDS cells was also significantly less suppressed suggesting that the disregulation in HIV infection is more prominent prior to the IL-2 stage of the mitogenic pathway. It is remarkable that the CD4+ and CD8+ T-cells at both the HIV+ and AIDS stages generally show the same degree of suppression with all the various activators and coactivators used.(ABSTRACT TRUNCATED AT 250 WORDS)