Prostacyclin-IP signaling and prostaglandin E2-EP2/EP4 signaling both mediate joint inflammation in mouse collagen-induced arthritis.

Prostacyclin-IP signaling and prostaglandin E2-EP2/EP4 signaling both mediate joint inflammation in mouse collagen-induced arthritis.
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前列环蛋白-IP信号传导和前列腺素E2-EP2/EP4信号传导均介导小鼠胶原蛋白诱导的关节炎中的关节炎症。

DOI:
10.1084/jem.20051310
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发表时间:
2006-02-20
影响因子:
15.3
通讯作者:
Narumiya, S
Narumiya, S
中科院分区:
医学1区
文献类型:
--
作者:
Honda, T;Segi-Nishida, E;Miyachi, Y;Narumiya, S

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前列腺素 (PG)I2(前列环素 [PGI])和 PGE2 大量存在于类风湿性关节炎 (RA) 患者的滑液中。尽管 PGE2 在 RA 中的作用已得到充分研究,但 PGI2 对 RA 的贡献程度却鲜为人知。为了研究这个问题,我们将缺乏 PGI 受体 (IP) 的小鼠与 DBA/1J 品系回交,并对它们进行胶原诱导关节炎 (CIA)。与野生型 (WT) 小鼠相比,IP 缺陷 (IP−/−) 小鼠的关节炎评分显着降低,尽管抗胶原抗体的产生和补体激活与 WT 小鼠相似。 IP−/− 小鼠的促炎细胞因子含量也显着降低,例如关节炎爪子中的白细胞介素 (IL)-6。一致地,向培养的滑膜成纤维细胞中添加 IP 激动剂可显着增强 IL-6 的产生并诱导其他关节炎相关基因的表达。另一方面,每种 PGE 受体亚型的单独缺失或抑制并不影响 CIA 炎症的引发。然而,通过联合抑制 EP2 和 EP4 实现了对 CIA 的部分但显着的抑制。我们的结果显示 PGI2-IP 和 PGE2-EP2/EP4 信号传导在 CIA 的发展中发挥重要作用,并表明单独抑制 PGE2 合成可能不足以抑制 RA 症状。
Prostaglandin (PG)I2 (prostacyclin [PGI]) and PGE2 are abundantly present in the synovial fluid of rheumatoid arthritis (RA) patients. Although the role of PGE2 in RA has been well studied, how much PGI2 contributes to RA is little known. To examine this issue, we backcrossed mice lacking the PGI receptor (IP) to the DBA/1J strain and subjected them to collagen-induced arthritis (CIA). IP-deficient (IP−/−) mice exhibited significant reduction in arthritic scores compared with wild-type (WT) mice, despite anti-collagen antibody production and complement activation similar to WT mice. IP−/− mice also showed significant reduction in contents of proinflammatory cytokines, such as interleukin (IL)-6 in arthritic paws. Consistently, the addition of an IP agonist to cultured synovial fibroblasts significantly enhanced IL-6 production and induced expression of other arthritis-related genes. On the other hand, loss or inhibition of each PGE receptor subtype alone did not affect elicitation of inflammation in CIA. However, a partial but significant suppression of CIA was achieved by the combined inhibition of EP2 and EP4. Our results show significant roles of both PGI2-IP and PGE2-EP2/EP4 signaling in the development of CIA, and suggest that inhibition of PGE2 synthesis alone may not be sufficient for suppression of RA symptoms.
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发表时间: 2002-08-01
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