. . . . . . . . . . . "HIV-1 Tat sensitizes T cells to CD95 mediated apoptosis through the upregulation of CD95 ligand and caspase 8" . "HIV-1 Tat upregulates FasL expression by enhancing Egr-dependent and NF-kappaB mediated transactivation of the FasL promoter" . "HIV-1 Tat has a synergistic effect on Cryptosporidium parvum-induced cholangiocyte apoptosis via a paracrine-mediated, FasL-dependent mechanism" . "interacts with" . "upregulates" .