. . . . "Binding of HIV-1 envelope protein gp120 to CD4 downregulates Bcl-2 expression; this effect is inhibited by gp17/GCDFP-15, which blocks the ability of CD4 to interact with gp120, leading to moderate up-regulation of Bcl-2" . "Gross cystic disease fluid protein-15 (GCDFP-15) binds to CD4, a T-cell co-receptor involved in antigen recognition, thereby inhibiting the ability of the receptor to interact with the HIV-1 envelope protein gp120" . "inhibited by" .