iPLA2beta: front and center in human monocyte chemotaxis to MCP-1.

iPLA2beta: front and center in human monocyte chemotaxis to MCP-1.
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DOI:
10.1084/jem.20071243
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发表时间:
2008-02-18
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Cathcart MK
Cathcart MK
中科院分区:
其他
文献类型:
--
作者:
Mishra RS;Carnevale KA;Cathcart MK

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单核细胞趋化蛋白-1 (MCP-1)指导血液单核细胞向炎症组织的迁移。尽管趋化性在免疫应答中发挥着核心作用,但信号转导途径对趋化性的调节及其在体内的意义仍有待彻底破译。在这项研究中,我们研究了最近发现的两种趋化性调节因子,Ca2+独立磷脂酶(iPLA2β)和细胞质磷脂酶(cPLA2α)的细胞内位置和功能,并证实了它们在体内的重要性。这些酶在未受刺激的单核细胞中存在于细胞质中。在MCP-1刺激下,iPLA2β被招募到富含膜的假足。相反,cPLA2α被募集到内质网。虽然iPLA2β或cPLA2α反义寡脱氧核糖核苷酸(ODN)处理单核细胞显示速度降低,但iPLA2β也调节方向性和肌动蛋白聚合。iPLA2β或cPLA2α反义odn处理过的小鼠单核细胞在体内向腹膜迁移时显示出严重的缺陷。这些趋同的观察结果表明,iPLA2β和cPLA2α调节单核细胞从细胞内不同位置的迁移,其中iPLA2β作为细胞罗盘的关键调节因子,并将它们确定为抗炎策略的潜在靶点。
Monocyte chemoattractant protein-1 (MCP-1) directs migration of blood monocytes to inflamed tissues. Despite the central role of chemotaxis in immune responses, the regulation of chemotaxis by signal transduction pathways and their in vivo significance remain to be thoroughly deciphered. In this study, we examined the intracellular location and functions of two recently identified regulators of chemotaxis, Ca2+-independent phospholipase (iPLA2β) and cytosolic phospholipase (cPLA2α), and substantiate their in vivo importance. These enzymes are cytoplasmic in unstimulated monocytes. Upon MCP-1 stimulation, iPLA2β is recruited to the membrane-enriched pseudopod. In contrast, cPLA2α is recruited to the endoplasmic reticulum. Although iPLA2β or cPLA2α antisense oligodeoxyribonucleotide (ODN)–treated monocytes display reduced speed, iPLA2β also regulates directionality and actin polymerization. iPLA2β or cPLA2α antisense ODN–treated adoptively transferred mouse monocytes display a profound defect in migration to the peritoneum in vivo. These converging observations reveal that iPLA2β and cPLA2α regulate monocyte migration from different intracellular locations, with iPLA2β acting as a critical regulator of the cellular compass, and identify them as potential targets for antiinflammatory strategies.
筏结构域的动态重新分布是细胞趋化过程中信号传导的组织平台。
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