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通过CRISPR激活系统激活UCHL1,促进了由HIF-1α/SOX9介导的软骨分化
Shanwei Shi1,2, Yang Ge1,2, Qiqian Yan1,2
1School of Stomatology, Stomatological Hospital, Southern Medical University, Guangzhou, China.
激活Ubiquitin C-终端酶L1 (UCHL1) 通过增强缺氧诱导因子-1α (HIF-1α) 稳定性和干细胞中的SOX9表达,促进软骨再生. 这种CRISPR激活策略显示出对软骨组织工程的前景.
科学领域:
- 生物医学工程 生物医学工程
- 干细胞生物学 干细胞生物学
- 再生医学是一种再生医学.
背景情况:
- 介质细胞干细胞分化和细胞外基质的保存是软骨组织重建的关键.
- 缺氧诱导因子-1α (HIF-1α) 对于维持状细胞表型和细胞外基质在状组织工程中至关重要.
- 乌比基C终端酸酶L1 (UCHL1) 双双基化HIF-1α,但其在体生成中的作用尚未被探索.
研究的目的:
- 研究UCHL1在脂肪衍生干细胞 (ADSCs) 的体基因分化中的调控作用.
- 开发和优化CRISPR激活 (CRISPRa) 系统,用于在软骨再生中增强UCHL1.
- 阐明UCHL1通过HIF-1α和SOX9.9通过chondrogenesis影响的机制.
主要方法:
- 验证了UCHL1在ADSCs中对chondrogenesis的促进作用.
- 通过使用CRISPRa与来自Staphylococcus aureus和Streptococcus pyogenes的dCas9设计了一种混合型细菌病毒系统,以准UCHL1.
- 使用UCHL1和HIF-1α抑制剂,以及SOX9siRNA来阻断关键因素;通过qRT-PCR,免疫光和组织学染色来评估原生态.
主要成果:
- 与Streptococcus pyogenes相比,来自金黄色葡萄球菌的CRISPRa系统显示出更高的UCHL1激活效率.
- 一种基于Cre/loxP的杂交细菌病毒延长了UCHL1激活的持续时间.
- 发现UCHL1通过调节HIF-1α的稳定性和局部化来增强SRY盒转录因子9 (SOX9) 表达,从而促进ADSC中的软骨生产.
结论:
- 通过CRISPRa激活UCHL1,可显著增强ADSCs中的体生成.
- UCHL1通过稳定HIF-1α和上调SOX9表达来促进软骨的形成.
- 这种激活UCHL1的CRISPRa系统为软骨再生应用提供了一个有前途的战略.
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