通过Brd4-关联蛋白和细胞周期控制蛋白p21探索β细胞SASP的转录调节
Jasmine Manji1,2, Jasmine Pipella1,2, Gabriel Brawerman1,2
1Diabetes Research Envisioned and Accomplished in Manitoba (DREAM) Theme, Children's Hospital Research Institute of Manitoba, Winnipeg, MB R3E 3P4, Canada.
Epigenomes
|March 27, 2024
概括
1型糖尿病涉及β细胞衰老和SASP. 原体外终端 (BET) 蛋白 Brd4 与衰老β细胞中的染色质重塑剂相互作用,这表明它在调节这一过程中发挥了作用.
科学领域:
- 内分泌学 在内分泌学.
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
背景情况:
- 1型糖尿病 (T1D) 的特征是胰腺β细胞的自身免疫破坏.
- 这些β细胞的一个子集进入衰老,这种状态的标志是生长停止和与衰老相关的分泌表型 (SASP).
- 在T1Dβ细胞中,原体外终端 (BET) 蛋白对SASP的转录调节尚未完全理解.
研究的目的:
- 研究调节β细胞衰老和SASP在1型糖尿病中的转录机制.
- 在衰老的β细胞中识别BET蛋白Brd4的结合伙伴.
- 探索p21在β细胞衰老和SASP中的作用.
主要方法:
- 利用了NIT-1细胞系,这是T1Dβ细胞衰老的NOD小鼠模型.
- 通过共免疫沉和质谱学识别了 Brd4 相互作用蛋白.
- 分析了来自小鼠和人类小岛的单细胞RNA-seq数据.
- 在衰老的NIT-1细胞中执行RNAi对p21的敲击.
主要成果:
- 在衰老的NIT-1细胞中,Brd4与Ino80染色体重塑复合物的成分相互作用.
- 在NOD小鼠和人类小岛中,在T1D进展过程中,ino80复合子单元被表达在β细胞中.
- 抑制p21并没有显著影响β细胞活力或SASP诱导.
结论:
- 在β细胞衰老过程中,Brd4与蛋白质伙伴相互作用,可能包括染色体重塑剂.
- 这些相互作用可能有助于SASP基因的转录激活.
- 在这种β细胞衰老模型中,p21对SASP并不重要.
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