HIV-1 Envelope Glycoproteins Induce the Production of TNF-? and IL-10 in Human Monocytes by Activating Calcium Pathway.

ABSTRACT: Human HIV-1 infection leads inevitably to a chronic hyper-immune-activation. However, the nature of the targeted receptors and the pathways involved remain to be fully elucidated. We demonstrate that X4-tropic gp120 induced the production of TNF-? and IL-10 by monocytes through activation of a cell membrane receptor, distinct from the CD4, CXCR4, and MR receptors. Gp120 failed to stimulate IL-10 and TNF-? production by monocytes in Ca²⁺ free medium. This failure was total for IL-10 and partial for TNF-?. However, IL-10 and TNF-? production was fully restored following the addition of exogenous calcium. Accordingly, addition of BAPTA-AM and cyclosporine-A, fully and partially inhibited IL-10 and TNF-? respectively. The PKA pathway was crucial for IL-10 production but only partially involved in gp120-induced TNF-?. The PLC pathway was partially and equivalently involved in gp120-induced TNF-? and IL-10. Moreover, the inhibition of PI3K, ERK1/2, p38 MAP-kinases and NF-?B pathways totally abolished the production of both cytokines. In conclusion, this study revealed the crucial calcium signaling pathway triggered by HIV-1 gp120 to control the production of these two cytokines: TNF-? and IL-10. The finding could help in the development of a new therapeutic strategy to alleviate the chronic hyper-immune-activation observed in HIV-1 infected patients.

SUBMITTER: Planes R 

PROVIDER: S-EPMC6249280 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature