趋化因子受体
细胞生物学
CXCL2型
趋化因子
过氧化物酶体增殖物激活受体
CXCL14型
化学
白细胞介素8
受体
趋化因子受体
CXCL10型
生物
细胞因子
免疫学
生物化学
作者
Elena Rigamonti,Coralie Fontaine,Bruno Lefebvre,Christian Duhem,Philippe Lefebvre,Darren K. McGuire,Bart Staels,Giulia Chinetti-Gbaguidi
标识
DOI:10.1161/atvbaha.107.161679
摘要
Objective— Macrophages play a central role in the immune response against infectious organisms. Once activated, macrophages secrete proinflammatory cytokines and chemokines. Interleukin (IL)-8 and related CXC chemokines play a role in the recruitment and activation of phagocytes acting through CXCR1 and CXCR2 receptors. The nuclear receptor peroxisome proliferator-activated receptor (PPAR) γ exerts antiinflammatory properties in macrophages, by inhibiting cytokine and CC chemokine production. In this study, we investigated whether PPAR-γ also plays a role in the regulation of the CXC chemokine pathway. Methods and Results— Synthetic PPAR-γ ligands increase CXCR2 but not CXCR1 gene expression in a PPAR-γ-dependent manner in primary human macrophages in vitro and in atherosclerotic plaques in vivo. The increase of CXCR2 mRNA was paralleled by an increase in membrane protein expression. EMSA, ChIP, and transient transfection assays indicate that PPAR-γ activates the CXCR2 promoter by binding to a PPAR response element (PPRE). Finally, human macrophages acquire responsiveness to the CXCR2 ligands (IL-8 and Groβ), as measured by superoxide anion production, after induction of CXCR2 expression by PPAR-γ ligands. Conclusions— Our results provide a novel mechanism via which PPAR-γ can enhance the immune response in human macrophages.
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