对辐射敏感的circRNA促进肠道再生
Hui Cai1,2, Xin Liang3, Shazhen Ai4
1Chinese Academy of Medical Sciences & Peking Union Medical College Institute of Radiation Medicine, Tianjin, 300192, China.
Cellular & molecular biology letters
|August 29, 2025
概括
一种新的圆形RNA,circDmbt1 ((3,4,5,6),作为辐射诱导肠道损伤 (RIII) 的有前途的生物标志物. 它的表达保护肠上皮细胞并促进再生,为RIII提供潜在的诊断和治疗点.
科学领域:
- 分子生物学
- 胃肠病学
- 辐射瘤学
背景情况:
- 肠道对电离辐射 (IR) 非常敏感,导致辐射引起的肠道损伤 (RIII),这显著影响患者的生活质量.
- 目前对RIII的诊断生物标志物和治疗方法有限,因此需要确定新的治疗点.
- 循环RNAs (circRNAs) 与各种疾病有关,但它们在辐射引起的肠损伤中的作用在很大程度上尚未被探索.
研究的目的:
- 确定涉及辐射诱导肠道损伤的新型循环RNA.
- 调查特定的肠道特异性circRNA,circDmbt1 ((3,4,5,6) 的功能和机制,以防止辐射损伤.
- 评估circDmbt1 ((3,4,5,6) 作为RIII的潜在诊断生物标志物和治疗标.
主要方法:
- 使用RNA测序来识别差异表达的circRNA.
- 在体外研究中,研究了circDmbt1 ((3,4,5,6) 对肠道上皮细胞增殖,细胞亡和DNA损伤的影响.
- 用肠道器官和小鼠模型来验证circDmbt在辐射引起的肠道损伤中的作用.
主要成果:
- 辐射后,CircDmbt1 ((3, 4, 5, 6) 在小鼠肠道下调,与损伤严重程度相关.
- 过度表达circDmbt1 ((3,4,5,6) 促进了细胞增殖,减少了细胞亡和DNA损伤,并提高了放射后的器官存活率.
- 在体内,circDmbt1 ((3,4,5,6) 过度表达改善了肠道的长度,上皮质完整性和关键细胞类型的比例,促进了肠道的适应.
结论:
- CircDmbt1 ((3,4,5,6) 是一种新的,快速反应的早期RIII生物标志物.
- 在辐射损伤后,circDmbt1的外源表达增强了肠道的恢复.
- circDmbt1 ((3,4,5,6) /miR-125a-5p/STAT3轴对辐射后肠上皮再生至关重要,为RIII提供了潜在的诊断和治疗策略.
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