A&R:谷氨酰胺酶2通过支持系统性红斑狼疮的抗氧化防御促进CD4+ T细胞产生白细胞介素2

2022-07-26 彼岸河边草 MedSci原创

该研究结果表明,谷氨酰胺酶同工酶GLS2通过支持抗氧化防御在CD4+ T细胞产生IL-2中起关键作用,并且它们提供了一种新方法来纠正系统性红斑狼疮(SLE)中T 细胞产生IL-2。

目的谷氨酰胺酶(GLS)同工酶GLS1GLS2催化谷氨酰胺分解的第一步。GLS1Th17 细胞分化所必需的,其抑制作用可抑制动物的自身免疫性疾病,但GLS2的功能尚不清楚。本研究的目的是探讨GLS2CD4+ T细胞功能和系统性红斑狼疮(SLE)发病机制中的作用。

方法研究人员通过流式细胞术测量活性氧(ROS)水平、脂质过氧化和线粒体质量和极化,通过双荧光素酶测定产生白细胞介素2 (IL-2),通过实时聚合酶链测量Il2CpG DNA甲基化反应系统。检测了野生型GLS1、野生型GLS2或突变型GLS2CD4+ T细胞中PDZ结构域结合基序(GLS2C端定义了一个PDZ结构域结合基序,它可以与含有PDZ结构域的蛋白质结合,这是GLS2GLS1不同的结构组成)的过表达的影响。此外,通过蛋白质印迹分析了来自狼疮易感小鼠和SLE患者的CD4+ T细胞中GLS2的表达。

结果GLS2,而不是GLS1,降低了T细胞中的ROS水平和脂质过氧化并恢复了线粒体功能。GLS2通过Il2启动子的去甲基化促进IL-2的产生。PDZ结构域结合基序的突变减弱了GLS2调节IL-2ROS水平的能力。在狼疮易发小鼠和SLE患者中,CD4+ T细胞中 GLS2的表达降低。最后,GLS2过表达纠正了ROS水平并恢复了狼疮易感小鼠和SLE患者的CD4+ T细胞产生的IL-2

结论该研究结果表明,GLS2通过支持抗氧化防御在CD4+ T细胞产生IL-2中起关键作用,并且它们提供了一种新方法来纠正SLET 细胞产生IL-2

出处:Hisada R, Yoshida N, Orite SYK, Umeda M, Burbano C, Scherlinger M, Kono M, Krishfield S, Tsokos GC. Role of Glutaminase 2 in Promoting CD4+ T Cell Production of Interleukin-2 by Supporting Antioxidant Defense in Systemic Lupus Erythematosus. Arthritis Rheumatol. 2022 Jul;74(7):1204-1210. doi: 10.1002/art.42112. Epub 2022 May 12. PMID: 35254008.

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    2023-03-11 qidongfanjian
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    2023-01-28 xuyu
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    2022-07-28 zhouqu_8
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