Interaction of HIV-1 core p24 antigen with human monocytic cell line THP1 results in TNF-alpha dependent secretion of matrix metalloproteinase-9.
- Author:
Ji Hye SUNG
1
;
Seung Hee YOO
;
Hae Kyung PARK
;
Young Hae CHONG
Author Information
1. Department of Microbiology, College of Medicine, Ewha Womans University, 911-1, Mok-6-dong, Yangcheonku, Seoul, 158-056, South Korea.
- Publication Type:Original Article
- MeSH:
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
- From:Journal of the Korean Society for Microbiology
2000;35(1):9-18
- CountryRepublic of Korea
- Language:Korean
-
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.
