title: HIV-1 modulates the expression of gelatinase A and B in monocytic cells.
abstract: The levels of mRNA of both gelatinases A and B were dramatically decreased in HIV-infected cells, when compared to uninfected cells. The expression of gelatinase A in HIV-infected cells was selectively increased by tumor necrosis factor (TNF alpha) while the expression of gelatinase B was not affected. In contrast, in uninfected cells TNF alpha down regulated gelatinase B mRNA level, without affecting the gelatinase A. N-acethylcysteine (NAC) increased the levels of mRNA of both gelatinases. The conditioned media from HIV-infected and uninfected cells had comparable level of secreted gelatinase A protein. These data suggest that in monocytic cells different regulatory pathways control gelatinases A and B and that HIV could modulate in vivo the expression of these proteolytic enzymes, critically involved in regulation of invasion of basement membrane.
authors: Molecular Oncology Section, National Cancer Institute, NIH, Bethesda, MD 20892-1928.
authors: T
authors: T
authors: Kalebic
authors: L
authors: L
authors: Masiero
authors: M
authors: M
authors: Onisto
authors: S
authors: S
authors: Garbisa
mesh_terms: D002460:Cell Line; D017364:Collagenases / Q000032:analysis / Q000096:biosynthesis*; D017077:Culture Media, Conditioned; D004797:Enzyme-Linked Immunosorbent Assay; D018093:Gelatinases / Q000032:analysis / Q000096:biosynthesis*; D015870:Gene Expression / Q000187:drug effects; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D006801:Humans; D007700:Kinetics; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D008666:Metalloendopeptidases / Q000032:analysis / Q000096:biosynthesis*; D009000:Monocytes / Q000201:enzymology* / Q000821:virology; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000032:analysis / Q000096:biosynthesis; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D017077:Culture Media, Conditioned; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D017364:Collagenases; D018093:Gelatinases; D008666:Metalloendopeptidases; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9