项目名称: 2型甲酰肽受体调控M2型巨噬细胞极化的分子机制及其在炎症反应中的作用
项目编号: No.81202316
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 医学免疫学、法医学
项目作者: 孙磊
作者单位: 上海交通大学
项目金额: 23万元
中文摘要: 巨噬细胞(MΦ)在炎症发生、发展、转归上起重要作用。MΦ分为M1(致炎型)和M2(抗炎型)两种亚型。近来研究发现M2型MΦ在抑制炎症中发挥重要作用,但其诱导机制还不很清楚。前期研究发现,IL-4刺激下,2型甲酰肽受体(Fpr2)敲除小鼠原代MΦ向M2型极化明显降低;而过表达Fpr2,则明显上升。结果提示Fpr2对M2型MΦ极化起重要调控作用。但其作用机制有待进一步探讨。我们的假说是:Fpr2可能通过ERK与Stat6-IRF4协同作用促进M2型MΦ极化,起抗炎作用。为验证这一假说,我们将用Fpr2敲除小鼠原代MΦ,从分子、细胞水平探讨Fpr2调控M2型MΦ极化的机制。同时利用腹膜炎模型从整体动物水平明确Fpr2通过促进M2型MΦ极化增加抗炎细胞因子分泌,增强胞葬作用,而发挥抗炎功能。本研究将从新视角揭示Fpr2调控M2型MΦ极化的分子机制,为以Fpr2为靶点进行抗炎药物研发提供坚实的基础。
中文关键词: 2型甲酰肽受体;巨噬细胞;极化;血清淀粉样蛋白A;
英文摘要: Macrophages play an important role in development and progression of inflammation.Macrophage significantly influences the quality, duration and magnitude of most inflammatory reactions in a polarized manner.The classically activated macrophages(M1) produce pro-inflammatory cytokines,e.g., IL-6,IL-12,IL-23,to elicit chronic inflammation, whereas alternatively activated macrophages(M2) produce anti-inflammatory cytokines,e.g.,IL-10,to resolve inflammation.However,mechanisms underlying macrophage polarization are incompletely understood.Our previous studies demonstrated a critical role of formyl peptide receptor 2(Fpr2) in M2 macrophage polarization.For instance,we found that Fpr2-/- macrophage had a diminished M2 macrophage polarization in IL-4 induced system,whereas Fpr2 overexpression enhanced M2 genes expression. The ligand ANXA1 expression was robustly induced in M2 macrophages and played an important role in regulating M2 macrophage polarization.However,mechanisms underlying the invovlement of Fpr2 in M2 macrophage polarization remain largely unknown.We propose that Fpr2 regulates M2 macrophage polarization through synergistic effect of ERK and Stat6-IRF4 pathway,thus providing an explanation to the observed anti-inflammatory effect of Fpr2 ligands.To test the hypothesis, macrophage cell lines and primary ma
英文关键词: Formyl peptide receptor 2;macrophage;polarization;Serum amyloid A;