J Korean Soc Microbiol.  2000 Feb;35(1):9-18.

Interaction of HIV-1 core p24 antigen with human monocytic cell line THP1 results in TNF-alpha dependent secretion of matrix metalloproteinase-9

• Sung JH
• Yoo SH
• Park HK
• Chong YH

Abstract

Immunological mechanisms involving the release of inflammatory factors by HIV-1 infected microglia in the brain have been implicated in the pathogenesis of HIV dementia (HIVD). Since the regulation of matrix metalloproteinases (MMPs) activity can be influenced by variety of inflammatory mediators, this study was undertaken to look for a correlation between the MMP-9 release and the production of TNF-alpha in response to HIV-1 p24 in the human monocyte cell line THP-1 as a model for microglia. First, it was shown that HIV-1 core p24 antigen induced THP-1 to secrete MMP-9 in a dose response manner while it elicited a little effect on MMP-2 release in human astroglial cell line T98G. Next, it was found that p24 induced THP-1 to secrete TNF-alpha without prior differentiation into macrophages by phorbol myristate acetate (PMA) treatment. Furthermore, anti-TNF-alpha neutralizing antibodies significantly blocked p24-induced MMP-9 release in a dose dependent manner. Our data indicate that p24 antigen induces monocytic MMP-9 release by triggering up-regulation of TNF-alpha secretion.

MeSH Terms

AIDS Dementia Complex
Antibodies, Neutralizing
Brain
Cell Line*
HIV-1*
Humans*
Macrophages
Matrix Metalloproteinase 9*
Matrix Metalloproteinases
Microglia
Monocytes
Tetradecanoylphorbol Acetate
Tumor Necrosis Factor-alpha*
Up-Regulation
Antibodies, Neutralizing
Matrix Metalloproteinase 9
Matrix Metalloproteinases
Tetradecanoylphorbol Acetate
Tumor Necrosis Factor-alpha