放松调节的Myt3转化使得岛屿β细胞在肥胖引起的代谢压力下产生功能障碍
bioRxiv : the preprint server for biology
|June 4, 2025
概括
转录因子Myt3在肥胖期间防止岛屿β细胞衰竭. 它的翻译调节对于补偿代谢压力和预防2型糖尿病的发展至关重要.
科学领域:
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 肥胖引起的代谢压力会导致小岛β细胞衰竭和2型糖尿病 (T2D).
- 转录因子Myt3 (St18) 和其对应物 (Myt1,Myt2) 之前被确定为抗β细胞衰竭的保护因子.
- 在T2D发育过程中,Myt3的表达下调,Myt3的遗传变异与糖尿病风险有关.
研究的目的:
- 为了研究在代谢压力下的小鼠β细胞中Myt3翻译的转录后调节.
- 确定破坏Myt3翻译调节对β细胞功能和葡萄糖平衡的功能后果.
主要方法:
- 通过在小鼠β细胞中重叠的上游开放阅读框架来分析Myt3翻译调节.
- 基因操纵以破坏上游的开放阅读框架并改变Myt3翻译.
- 在正常和高脂肪饮食条件下对小鼠的β细胞功能,葡萄糖耐受性和基因表达的评估.
主要成果:
- Myt3的翻译是由一个与主要的Myt3编码序列重叠的上游开放读取框架调节的.
- 这种重叠的破坏导致非压力细胞中Myt3转化增加,但在高脂肪饮食条件下转化减少.
- 在小鼠中,Myt3转化失调导致β细胞功能障碍,葡萄糖不耐受性和关键β细胞功能基因的改变表达.
结论:
- 压力诱导的Myt3翻译是β细胞中预防失效的关键补偿机制.
- 这种转化控制的失调有助于β细胞功能障碍和葡萄糖不耐症的发展.
- 向Myt3翻译可能为2型糖尿病提供治疗策略.
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