An essential role of cytosolic phospholipase A2alpha in prostaglandin E2-mediated bone resorption associated with inflammation.

An essential role of cytosolic phospholipase A2alpha in prostaglandin E2-mediated bone resorption associated with inflammation.
复制标题

胞质磷脂酶A2Alpha在前列腺素E2介导的骨吸收与炎症相关的骨吸收中的重要作用。

DOI:
10.1084/jem.20030015
复制
发表时间:
2003-05-19
影响因子:
15.3
通讯作者:
Ito, A
Ito, A
中科院分区:
医学1区
文献类型:
--
作者:
Miyaura, C;Inada, M;Matsumoto, C;Ohshiba, T;Uozumi, N;Shimizu, T;Ito, A

文献摘要

参考文献

被引文献

相似文献

成骨细胞产生的前列腺素E(PGE)2是骨吸收的有效刺激物。炎性骨丢失伴随着骨吸收细胞因子诱导的破骨细胞形成,但体内PGE 2产生和骨吸收的机制尚不完全清楚。利用胞浆型磷脂酶A2α(cPLA 2 α)基因敲除小鼠,我们研究了cPLA 2 α在PGE 2合成和骨吸收中的作用。在骨髓培养中,白细胞介素(IL)-1显著刺激野生型小鼠PGE 2的产生和破骨细胞的形成,但在cPLA 2 α-null小鼠中没有。成骨细胞骨髓基质细胞诱导表达环氧合酶(考克斯)-2和膜结合PGE 2合酶(mPGES),以响应IL-1和脂多糖(LPS)产生PGE 2。从cPLA 2 α-null小鼠收集的成骨基质细胞也可诱导IL-1和LPS表达考克斯-2和mPGES,但由于缺乏花生四烯酸释放而不能产生PGE 2。给予野生型小鼠LPS通过增加骨吸收降低股骨骨矿物质密度。然而,在cPLA 2 α-null小鼠中,根本没有观察到LPS诱导的骨丢失。在这里,我们发现cPLA 2 α在成骨细胞产生PGE和骨细胞骨吸收中起关键作用,并提出了通过抑制cPLA 2 α治疗炎症性骨病的新方法。
Prostaglandin E (PGE)2 produced by osteoblasts acts as a potent stimulator of bone resorption. Inflammatory bone loss is accompanied by osteoclast formation induced by bone-resorbing cytokines, but the mechanism of PGE2 production and bone resorption in vivo is not fully understood. Using cytosolic phospholipase A2α (cPLA2α)-null mice, we examined the role of cPLA2α in PGE2 synthesis and bone resorption. In bone marrow cultures, interleukin (IL)-1 markedly stimulated PGE2 production and osteoclast formation in wild-type mice, but not in cPLA2α-null mice. Osteoblastic bone marrow stromal cells induced the expression of cyclooxygenase (COX)-2 and membrane-bound PGE2 synthase (mPGES) in response to IL-1 and lipopolysaccharide (LPS) to produce PGE2. Osteoblastic stromal cells collected from cPLA2α-null mice also induced the expression of COX-2 and mPGES by IL-1 and LPS, but could not produce PGE2 due to the lack of arachidonic acid release. LPS administration to wild-type mice reduced femoral bone mineral density by increased bone resorption. In cPLA2α-null mice, however, LPS-induced bone loss could not be observed at all. Here, we show that cPLA2α plays a key role in PGE production by osteoblasts and in osteoclastic bone resorption, and suggest a new approach to inflammatory bone disease by inhibiting cPLA2α.
DOI: 10.1074/jbc.m003505200
发表时间: 2000-10-20
影响因子: 4.8
作者:
Murakami, M;Naraba, H;Kudo, I
通讯作者: Kudo, I
DOI: 10.1073/pnas.96.13.7220
发表时间: 1999-06-22
影响因子: 11.1
作者:
Jakobsson, PJ;Thorén, S;Samuelsson, B
通讯作者: Samuelsson, B
DOI: 10.1074/jbc.m002079200
发表时间: 2000-06-30
影响因子: 4.8
作者:
Miyaura, C;Inada, M;Suda, T
通讯作者: Suda, T
DOI: 10.1038/36593
发表时间: 1997-11-13
期刊: NATURE
影响因子: 64.8
作者:
Anderson, DM;Maraskovsky, E;Galibert, L
通讯作者: Galibert, L
DOI: 10.1073/pnas.94.17.9360
发表时间: 1997-08-19
影响因子: 11.1
作者:
Miyaura, C;Onoe, Y;Suda, T
通讯作者: Suda, T