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通过多层次调节cGAS,KAT2A会影响狼性炎的炎症进展
Youzhou Tang1, Ying Zhang2, Qingtai Cao2
1Department of Nephropathy and Rheumatology, the 3rd Xiangya Hospital, Central South University, Changsha, 410013, Hunan, China.
概括
酸乙转移酶2A (KAT2A) 在体外负面调节循环GMP-AMP合成酶 (cGAS),但在狼性炎模型中促进炎症. 一种抑制剂显示出保护作用,表明KAT2A在体内超出cGAS的点.
科学领域:
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
- 脏病理学 脏病理学
背景情况:
- 持续的炎症会加剧狼性炎 (LN) 的损伤.
- 氨酸转移酶2A (KAT2A) 通过基因乙化调节基因表达.
- 在LN中KAT2A的促炎作用涉及免疫细胞中调节循环GMP-AMP合成酶 (cGAS),但机制尚不清楚.
研究的目的:
- 阐明KAT2A调节狼性炎中cGAS表达和激活的机制.
- 研究KAT2A对cGAS促进体和蛋白质的直接调节作用.
- 在狼小鼠模型中评估KAT2A抑制剂的治疗潜力.
主要方法:
- 通过免疫光定位KAT2A在LN脏组织中.
- 双 luciferase 记者测定和 ChIP-qPCR 来评估 KAT2A 对cGAS 促进者的影响.
- 共同免疫沉和西部涂抹以分析K279.9的cGAS乙化.
- ChIP-seq用于识别其他潜在的KAT2A目标.
- 在体内研究使用MRL/lpr狼小鼠模型与KAT2A抑制剂MB-3.
主要成果:
- 在体外,KAT2A对cGAS促进体进行负面调节,并在K279处对cGAS进行乙化,从而抑制其功能.
- ChIP-seq确定了与TREX2促进体结合的潜在KAT2A,这表明间接cGAS调节.
- 在体内,KAT2A抑制剂MB-3改善了MRL/lpr小鼠的蛋白尿和存活率,这表明它具有保护作用.
结论:
- KAT2A表现出双重作用:体外对cGAS表达和功能的负调节,体内对狼性炎的炎症效应.
- 在体内KAT2A的促炎作用可能涉及调节cGAS以外的额外目标,例如TREX2.2.
- 用像MB-3这样的抑制剂向KAT2A显示出治疗性 Lupus Nephritis 的前景.
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