ARD:KLF4和KLF2是关节组织细胞的重要调节剂,可防止骨关节炎中的组织破坏和炎症

2022-08-18 MedSci原创 MedSci原创

KLF4和KLF2可能是增加关节组织细胞保护和再生功能的中心转录因子,这表明 KLF基因转移或上调KLF的分子是骨关节炎(OA)的治疗候选者。

目的Krüppel样因子(KLF)转录因子是一类锌指蛋白,能够结合CACCCGT盒脱氧核糖核酸(DNA)元件并充当转录激活剂或阻遏剂。该研究目的在于KLF在正常和骨关节炎(OA)人软骨中的表达模式,并确定KLF4KLF2 在关节稳态和OA发病机制中的功能和机制。

方法实验方法包括人类关节组织细胞、转基因小鼠和具有病毒KLF4基因递送的小鼠 OA模型,以证明在结构和疼痛改善方面的治疗益处。机理研究应用了全局基因表达分析和染色质免疫沉淀测序(ChIP-seq)

结果:几个KLF基因在OA软骨中显著减少。其中,KLF4KLF2是软骨胶原基因和蛋白聚糖-4的强诱导剂。成熟小鼠中Klf2的软骨特异性缺失加重了实验性OA的严重程度。用表达KLF4KLF2的腺病毒(Ad)转导人软骨细胞可增强主要软骨细胞外基质(ECM)基因和SRY盒转录因子9的表达,并抑制炎症介质和ECM降解酶。Ad-KLF4Ad-KLF2在半月板细胞和滑膜细胞中增强了相似的保护功能,并促进了人间充质干细胞的软骨细胞分化将病毒KLF4递送至小鼠膝盖可降低OA相关的软骨、半月板和滑膜变化的严重程度,并改善疼痛行为。ChIP-seq分析表明KLF4直接结合软骨特征基因。Ras相关蛋白-1 信号通路是KLF4转导细胞中最丰富的通路,其信号轴参与KLF4KLF2上调软骨ECM 基因。

结论KLF4KLF2可能是增加关节组织细胞保护和再生功能的中心转录因子,这表明 KLF基因转移或上调KLF的分子是OA的治疗候选者

出处:Kawata M, Teramura T, Ordoukhanian P, Head SR, Natarajan P, Sundaresan A, Olmer M, Asahara H, Lotz MK. Krüppel-like factor-4 and Krüppel-like factor-2 are important regulators of joint tissue cells and protect against tissue destruction and inflammation in osteoarthritis. Ann Rheum Dis. 2022 May 9:annrheumdis-2021-221867. doi: 10.1136/annrheumdis-2021-221867. Epub ahead of print. PMID: 35534137.

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    2022-10-30 lisa438
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    2022-08-19 lmm397
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