title: Regulation of interleukin-10 secretion by histamine in TH2 cells and splenocytes.
abstract: Interleukin-10 is a potent suppressive factor that down-regulates cellular immune response via inhibition of the production of TH1 cytokines. Histamine shifts the TH1/TH2 balance from TH1 to TH2 cytokines making the effects of histamine on IL-10 secretion an important factor in this switch. This study was designed to assess the role of histamine in the regulation of IL-10 production and the involvement of PKA and STAT factors in this process. TH2 cells (D10.G4.1) and AKR/j splenocytes were pretreated with histamine at a concentration range of 10(-8)-10(-5) M for 1 h and then activated with PMA + ionomycin or anti-CD3 for 24 h. The supernatants were collected and tested for IL-10 content by ELISA. Histamine stimulated IL-10 production in TH2 cells in a dose-dependent manner that was reversed by both H1- and H2-receptor antagonists and by PKA inhibitors H8 and Rp-cAMPS. Tyrphostin also reversed the stimulation of IL-10 secretion by histamine, indicating that STAT factors were involved in this process. The up-regulation of IL-10 production by histamine in splenocytes was accompanied by inhibitory effects of histamine on IFN gamma production. The pretreatment of splenocytes with histamine in the presence of anti-IL-10 abrogated histamine-mediated inhibition of IFN gamma production suggesting that the effects of histamine on IFN gamma secretion were regulated by IL-10 in multi-cell system.
authors.affiliation: Department of Pharmaceutical and Administrative Sciences, Creighton University, Omaha, NE 68178, USA.
authors.forename: N
authors.initials: N
authors.lastname: Osna
authors.forename: K
authors.initials: K
authors.lastname: Elliott
authors.forename: M M
authors.initials: MM
authors.lastname: Khan
mesh_terms: D000818:Animals; D003994:Bucladesine / Q000494:pharmacology; D002460:Cell Line; D054746:Cyclic AMP-Dependent Protein Kinase Type II; D017868:Cyclic AMP-Dependent Protein Kinases / Q000037:antagonists & inhibitors; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006632:Histamine / Q000494:pharmacology*; D066298:In Vitro Techniques; D007371:Interferon-gamma / Q000096:biosynthesis; D016753:Interleukin-10 / Q000096:biosynthesis / Q000378:metabolism*; D015759:Ionomycin / Q000494:pharmacology; D051379:Mice; D008806:Mice, Inbred AKR; D011968:Receptors, Histamine / Q000187:drug effects; D013154:Spleen / Q000166:cytology / Q000187:drug effects / Q000276:immunology; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D018418:Th2 Cells / Q000187:drug effects* / Q000276:immunology* / Q000378:metabolism; D020032:Tyrphostins / Q000494:pharmacology
chemical_list: D004791:Enzyme Inhibitors; D011968:Receptors, Histamine; D020032:Tyrphostins; D016753:Interleukin-10; D015759:Ionomycin; D003994:Bucladesine; D006632:Histamine; D007371:Interferon-gamma; D054746:Cyclic AMP-Dependent Protein Kinase Type II; D017868:Cyclic AMP-Dependent Protein Kinases; D013755:Tetradecanoylphorbol Acetate