CCR5 and HIV-1 infection: Conversely, IL-2 stimulation of T cells was shown to induce an increased expression of CCR5 concomitantly with the secretion of CCR5 ligands whereas CD40L expression by T cells resulted in increased secretion of CCR5 ligands by macrophages and DC with selective inhibition of R5, but not of X4 HIV-1 infection [35].