EP4 and EP2 receptor activation of protein kinase A by prostaglandin E2 impairs macrophage phagocytosis of Clostridium sordellii.

EP4 and EP2 receptor activation of protein kinase A by prostaglandin E2 impairs macrophage phagocytosis of Clostridium sordellii.
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DOI:
10.1111/aji.12153
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发表时间:
2014-01
期刊:
American journal of reproductive immunology (New York, N.Y. : 1989)
影响因子:
--
通讯作者:
Aronoff DM
Aronoff DM
中科院分区:
其他
文献类型:
--
作者:
Rogers LM;Thelen T;Fordyce K;Bourdonnay E;Lewis C;Yu H;Zhang J;Xie J;Serezani CH;Peters-Golden M;Aronoff DM

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索氏梭状芽胞杆菌引起子宫内膜感染,但对宿主对这种病原体的防御知之甚少。我们验证了一种假设,即免疫调节脂质前列腺素(PG)E2通过受体诱导的细胞内cAMP增加来抑制人巨噬细胞清除索氏梭菌。用THP-1巨噬细胞系测定索氏弧菌的吞噬功能。PGE2可增加cAMP水平,激活蛋白激酶A(PKA),抑制依赖A类清道夫受体的索氏杆菌吞噬功能。EP2和EP4受体的激活增加了细胞内cAMP并抑制了吞噬作用,有证据表明EP4比EP2具有更重要的作用。EP受体表达数据和药理受体拮抗剂的使用支持了这一点。此外,PKA异构体RI在调节索氏杆菌摄取抑制方面似乎比RII更重要。内源性脂质介体PGE2损害人类对索氏杆菌的先天免疫反应。
Clostridium sordellii causes endometrial infections but little is known regarding host defenses against this pathogen. We tested the hypothesis that the immunoregulatory lipid prostaglandin (PG) E2 suppresses human macrophage clearance of C. sordellii through receptor-induced increases in intracellular cAMP. The THP-1 macrophage cell line was used to quantify C. sordellii phagocytosis. PGE2 increased cAMP levels, activated protein kinase A (PKA), and inhibited the class A scavenger receptor-dependent phagocytosis of C. sordellii. Activation of the EP2 and EP4 receptors increased intracellular cAMP and inhibited phagocytosis, with evidence favoring a more important role for EP4 over EP2. This was supported by EP receptor expression data and the use of pharmacological receptor antagonists. In addition, the PKA isoform RI appeared to be more important than RII in mediating the suppression of ingestion of C. sordellii. The endogenous lipid mediator PGE2 impairs human innate immune responses against C. sordellii.
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