title: Regulation of IL-13 production by histamine in cloned murine T helper type 2 cells.
abstract: Histamine affects the balance of T helper type 1 (Th1) and T helper type 2 (Th2) cytokines by shifting cytokine production from a Th1 to a Th2 pattern. Interleukin-13 (IL-13) is an important autacoid mediator that has been implicated in the development of allergic disease. This study was designed to investigate the mechanisms of regulation of IL-13 by histamine in Th2 cells. D10.G4.1 cells, a murine Th2 cell line, were treated with histamine (10(-8)-10(-4) M) and then activated with PMA (phorbol 12 myristate 13-acetate) plus ionomycin or alphaCD3. Levels of IL-13 production were then measured by enzyme-linked immunosorbent assay (ELISA) and semiquantitative reverse transcription-polymerase chain reaction (RT-PCR). Cells were pretreated with histamine receptor antagonists pyrilamine, ranitidine, cimetidine and thioperamide to determine the involvement of histamine receptors. Cells were also pretreated with protein kinase A (PKA) inhibitors N-[2-(methylaminoethyl)]-5-isoquinoline-sulfonamide (H-8) and Rp-diastereomer of adenosine cyclic 3'5'-phosphorothionate (Rp-cAMPS), and Janus kinase-signal transducer and activator of transcription (Jak-STAT) inhibitor tyrphostin AG490 prior to the addition of histamine. H-8 is an inhibitor of the catalytic subunit of PKA while Rp-cAMPS is an inhibitor of the regulatory subunit of PKA. Tyrphostin is an inhibitor of Jak2, Jak3, STATI, STAT3 and STAT5. Finally, cells were pretreated with IL-12, a monokine known to repress STAT6 DNA binding. We found that histamine dose-dependently enhanced IL-13 secretion and mRNA levels in Th2 cells via H1 and H2 receptors. Pretreatment of cells with H-8, Rp-cAMPS and tyrphostin prevented histamine-induced secretion and transcription of IL-13. Likewise, pretreatment of Th2 cells with IL-12 also reversed histamine's effects on IL-13 secretion from stimulatory to inhibitory. These observations suggest a role for PKA and the Jak-STAT pathway in histamine-mediated elevation of IL-13 secretion and transcription.
authors.affiliation: Department of Pharmaceutical and Administrative Sciences, Creighton University, Omaha, NE 68178, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Elliott
authors.forename: N A
authors.initials: NA
authors.lastname: Osna
authors.forename: M A
authors.initials: MA
authors.lastname: Scofield
authors.forename: M M
authors.initials: MM
authors.lastname: Khan
mesh_terms: D000818:Animals; D002460:Cell Line; D002999:Clone Cells; D003470:Culture Media; D000242:Cyclic AMP / Q000378:metabolism; D017868:Cyclic AMP-Dependent Protein Kinases / Q000037:antagonists & inhibitors; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006632:Histamine / Q000494:pharmacology*; D006633:Histamine Antagonists / Q000494:pharmacology; D007202:Indicators and Reagents; D018793:Interleukin-13 / Q000096:biosynthesis*; D007700:Kinetics; D051379:Mice; D012333:RNA, Messenger / Q000096:biosynthesis; D013154:Spleen / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D018418:Th2 Cells / Q000187:drug effects / Q000378:metabolism*; D014158:Transcription, Genetic / Q000187:drug effects; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D003470:Culture Media; D004791:Enzyme Inhibitors; D006633:Histamine Antagonists; D007202:Indicators and Reagents; D018793:Interleukin-13; D012333:RNA, Messenger; D006632:Histamine; D000242:Cyclic AMP; D017868:Cyclic AMP-Dependent Protein Kinases