骨髓介质干细胞衍生的外体Let-7b-5p通过TLR4/ATF4减少高葡萄糖诱导的微细胞激活和炎症
Yepin Zhang1, Yiyi Luo2, Jian Han2
1Department of Pathology, The People's Hospital of Chuxiong Yi Autonomous Prefecture and The Fourth Affiliated Hospital of Dali University, Chuxiong, China.
Mediators of inflammation
|February 12, 2026
概括
骨髓介质干细胞衍生外体 (BMSC-Exo) 提供let-7b-5p来抑制微质激活和炎症,为糖尿病视网膜病变 (DR) 提供潜在的治疗方法. 这种外体介导的传递向TLR4/ATF4通路,延迟了DR的进展.
科学领域:
- 眼科医生 眼科 眼科
- 干细胞生物学 干细胞生物学
- 分子生物学分子生物学
背景情况:
- 糖尿病视网膜病变 (DR) 是糖尿病中视力丧失的主要原因.
- 异常的微质激活是DR病变发生的关键因素.
- 骨髓介质干细胞衍生的外体细胞 (BMSC-Exo) 和它们的microRNAs (miRNAs) 对DR的治疗潜力已得到认可,但具体机制尚不清楚.
研究的目的:
- 研究BMSC-Exo提供的let-7b-5p在调节DR中的微质激活中的作用和分子机制.
- 为了阐明BMSC-Exo的治疗潜力,让-7b-5p在DR的小鼠模型中.
主要方法:
- 建立了DR小鼠模型,使用链毒素 (STZ) 并在实验室中用高葡萄糖 (HG) 刺激BV-2微质.
- 使用传输电子显微镜 (TEM) 进行了BMSC-Exo的表征.
- 评估了蛋白质和基因表达 (Western blot,RT-qPCR),微质激活 (免疫光),视网膜损伤 (HE染色) 和亡 (TUNEL测定).
主要成果:
- 在HG诱导的微质和DR视网膜中,BMSC-Exo治疗减少了激活标志物 (Iba1,TSPO) 和炎症性细胞因子 (TNF-α,IL-1β,IL-6),减轻了损伤和亡.
- 生物信息学揭示了DR中的let-7b-5p下调;其过度表达增强了BMSC-Exo的治疗效果,而Knockdown减弱了它们.
- 通过向TLR4/ATF4信号通路,BMSC-Exo let-7b-5p抑制了微质激活和炎症.
结论:
- BMSC-Exo提供let-7b-5p来抑制TLR4/ATF4通路,减轻微质激活和炎症.
- 这种机制延迟了糖尿病视网膜病变的进展.
- 携带let-7b-5p的BMSC-Exo代表了对DR的有希望的有针对性的治疗策略.
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