title: Induction of IL-4 release and upregulated expression of protease activated receptors by GM-CSF in P815 cells.
abstract: GM-CSF has been showed to be able to induce up-regulated receptor and cytokine expression in mast cells in inflammatory conditions. However, little is known of its effects on protease activated receptor (PAR) expression and Th2 cytokine secretion from mast cells. In the present study, we examined potential influence of GM-CSF on mast cell PAR expression and IL-4 and IL-10 release by using flow cytometry analysis, quantitative real time PCR, ELISA and cellular activation of signaling ELISA (CASE) techniques. The results showed that GM-CSF induced up to 3.0-fold increase in IL-4 release from P815 cells, and FSLLRY-NH(2) and trans-cinnamoyl (tc)-YPGKF-NH(2) did not affect GM-CSF induced IL-4 release. GM-CSF reduced tryptase and trypsin induced IL-4 release by up to approximately 55.8% and 70.3%, respectively. GM-CSF elicited the upregulated expression of PAR-1, PAR-2, PAR-3 and PAR-4 mRNAs, but enhanced only PAR-4 protein expression in P815 cells. U0126, PD98059 and LY204002 almost completely abolished GM-CSF induced IL-4 release when they were preincubated with P815 cells for 30 min, indicating ERK and Akt cell signaling pathways may be involved in the event. In conclusion, GM-CSF can stimulate IL-4 release from mast cells through an ERK and Akt cell signaling pathway dependent, but PAR independent mechanism. GM-CSF may serve as a regulator for IL-4 production in mast cells and through which participates in the mast cell related inflammation.
authors: Department of Pathophysiology, Hainan Medical College, Haikou, Hainan 571101, China.
authors: Huiyun
authors: H
authors: Zhang
authors: Haiwei
authors: H
authors: Yang
authors: Lianxia
authors: L
authors: Zhang
authors: Xiaoyu
authors: X
authors: Yang
authors: Zhongfang
authors: Z
authors: Zhang
authors: Qing
authors: Q
authors: Lin
authors: Shaoheng
authors: S
authors: He
mesh_terms: D002460:Cell Line; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology*; D006801:Humans; D016753:Interleukin-10 / Q000378:metabolism; D015847:Interleukin-4 / Q000378:metabolism*; D008407:Mast Cells / Q000187:drug effects / Q000276:immunology; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000378:metabolism; D044462:Receptors, Proteinase-Activated / Q000235:genetics / Q000378:metabolism*; D015854:Up-Regulation / Q000187:drug effects*
chemical_list: D012333:RNA, Messenger; D044462:Receptors, Proteinase-Activated; D016753:Interleukin-10; D015847:Interleukin-4; D016178:Granulocyte-Macrophage Colony-Stimulating Factor