ATP induces protein arginine deiminase 2-dependent citrullination in mast cells through the P2X7 purinergic receptor.

ATP induces protein arginine deiminase 2-dependent citrullination in mast cells through the P2X7 purinergic receptor.
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DOI:
10.4049/jimmunol.1201098
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发表时间:
2012-10-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Mowen KA
Mowen KA
中科院分区:
其他
文献类型:
--
作者:
Arandjelovic S;McKenney KR;Leming SS;Mowen KA

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翻译后修饰通过直接调节蛋白质功能或影响自身蛋白质的免疫识别来调节生理学。瓜氨酸化是通过蛋白质精氨酸脱亚胺酶 (PAD) 家族成员将精氨酸残基转化为瓜氨酸氨基酸而形成的翻译后修饰。我们已确定肥大细胞是 PAD2 酶的主要来源。炎症“危险”信号 ATP 激活 P2X7 受体可诱导 PAD2 活性和强大的蛋白质瓜氨酸化。 P2X7 介导的 PAD2 激活对 p38 MAPK 和 PKC 抑制剂敏感,并且 PAD2 调节肥大细胞中 TNFR2、Adamts-9 和 Rab6b 转录本的表达。此外,PAD2 酶及其瓜氨酸底物蛋白在被 ATP 激活后从肥大细胞中释放。 PAD2 表达与类风湿性关节炎 (RA) 滑膜组织中的炎症密切相关,并且在 RA 患者的滑液中发现了 PAD2 和瓜氨酸蛋白。此外,RA与瓜氨酸化自身蛋白的自身抗体的产生有关。我们的结果表明,肥大细胞的 P2X7 激活可能通过提供 PAD2 和 PAD2 底物进入细胞外空间而在炎症中发挥作用。
Posttranslational modifications regulate physiology either by directly modulating protein function or by impacting immune recognition of self proteins. Citrullination is a posttranslational modification formed by the conversion of arginine residues into the citrulline amino acid by protein arginine deiminase (PAD) family members. We have identified mast cells as a major source of the PAD2 enzyme. Activation of the P2X7 receptor by the inflammatory “danger” signal ATP induces PAD2 activity and robust protein citrullination. P2X7-mediated activation of PAD2 is sensitive to p38 MAPK and PKC inhibitors, and PAD2 regulates the expression of the TNFR2, Adamts-9, and Rab6b transcripts in mast cells. Further, the PAD2 enzyme and its citrullinated substrate proteins are released from mast cells upon activation with ATP. PAD2 expression is closely linked with inflammation in rheumatoid arthritis (RA) synovial tissue, and PAD2 and citrullinated proteins are found in the synovial fluid of RA patients. In addition, RA is associated with the development of autoantibodies to citrullinated self proteins. Our results suggest that P2X7 activation of mast cells may play a role in inflammation by providing PAD2 and PAD2 substrates access to the extracellular space.
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