RELA控制着贝塔细胞功能所必需的小岛特异性代谢基因网络
Nathan W Zammit1,2,3,4, Ying Ying Wong5, Stacey N Walters1,2
1Transplantation Immunology Laboratory, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia.
Diabetologia
|June 13, 2023
概括
转录因子RELA (p65) 对于β细胞中的正常葡萄糖代谢和胰岛素分泌至关重要,独立于其炎症作用. 这一发现影响了涉及NF-κB抑制剂的糖尿病治疗策略.
科学领域:
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
- 代谢过程中的代谢.
背景情况:
- NF-κB (激活B细胞的核因子卡帕光链增强剂) 的激活链接疾病中的代谢和炎症反应.
- 在正常的新陈代谢调节中NF-κB的特定作用,特别是在β细胞中,仍然不太了解.
研究的目的:
- 为了研究 RELA,一个正规的NF-κB转录因子,对β细胞转录景观的影响.
- 确定RELA对葡萄糖调节和胰岛素分泌的网络控制.
主要方法:
- 产生具有Rela (βp65KO) 或Ikbkg (βNEMOKO) 的β细胞特异缺失和A20 (βA20Tg) 的转基因表达的小鼠模型.
- 对人类小岛的ATAC-seq,pcHi-C和ChIP-seq数据进行生物信息学分析,以映射p65的约束和监管元素.
- 外体岛屿功能测定和移植研究,以评估葡萄糖耐受性和胰岛素分泌.
主要成果:
- 由于胰岛素分泌的丧失,贝塔细胞的相关缺陷导致葡萄糖耐受性受损,独立于炎症途径.
- 基底p65活性对于小岛内在的葡萄糖平衡至关重要.
- 全基因组测绘揭示了p65对代谢基因促进器和增强器枢纽的结合,调节小岛特异性基因表达.
结论:
- 在调节葡萄糖代谢所必需的β细胞特异性转录程序方面,RELA起着至关重要的,以前不被重视的作用.
- 这些发现表明糖尿病管理的潜在临床影响,特别是影响NF-κB激活的抗炎药物.
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