title: Effect of histamine on the gene expression and biosynthesis of complement components C2, factor B and C3 in mouse peritoneal macrophages.
abstract: The gene expression and biosynthesis of C2, factor B and C3 have been investigated in vitro in mouse resident peritoneal macrophages after incubation with histamine. C2- and factor B-specific mRNA and the amount of the immunoprecipitated C2 and factor B were decreased by 10(-4) M and 10(-8) M histamine. These effects can be abrogated by the H2 antagonist cimetidine and mimicked by the H2 agonists impromidine and 4-methylhistamine. Since the H1 antagonist chlorpheniramine and the H1 agonists PEA and 2-methylhistamine have little effect on C2 and are ineffective on factor B, a strong H2 receptor dependence of the inhibition of C2 and factor B gene expression and biosynthesis is suggested. Conversely, the C3 gene expression and biosynthesis can be influenced through both H1 and H2 receptors, e.g. elevated by histamine + cimetidine, PEA and 2-methylhistamine through H1 receptors, and inhibited by histamine + chlorpheniramine, impromidine and 4-methylhistamine through H2 receptors. The data obtained by quantification of C2, factor B and C3 mRNA concentration of peritoneal macrophages suggest that the regulation of biosynthesis of these complement components by histamine in mouse peritoneal macrophages is under pretranslational control.
mesh_terms: D000818:Animals; D003175:Complement C2 / Q000096:biosynthesis / Q000235:genetics*; D003176:Complement C3 / Q000096:biosynthesis / Q000235:genetics*; D011415:Complement Factor B / Q000096:biosynthesis / Q000235:genetics*; D004357:Drug Synergism; D004792:Enzyme Precursors / Q000235:genetics*; D005786:Gene Expression Regulation / Q000187:drug effects*; D006632:Histamine / Q000494:pharmacology*; D006633:Histamine Antagonists / Q000494:pharmacology; D008264:Macrophages / Q000276:immunology* / Q000378:metabolism; D008297:Male; D051379:Mice; D008808:Mice, Inbred CBA; D012333:RNA, Messenger / Q000032:analysis
chemical_list: D003175:Complement C2; D003176:Complement C3; D004792:Enzyme Precursors; D006633:Histamine Antagonists; D012333:RNA, Messenger; D006632:Histamine; D011415:Complement Factor B