通过抑制RANK,LGR4对于维持β细胞平衡至关重要
Joanna Filipowska1, Zelda Cisneros1, Sneha S Varghese1
1Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA 91010, USA; Department of Translational Research and Cellular Therapeutics, City of Hope, Duarte, CA 91010, USA.
Molecular metabolism
|January 9, 2025
概括
富含白的重复含有G蛋白结合受体4 (LGR4) 保护β细胞免于死亡,并促进其健康. LGR4抑制NFκB (RANK) 信号的受体激活器,这对于糖尿病治疗至关重要.
科学领域:
- 内分泌学和新陈代谢学
- 细胞生物学 细胞生物学
- 糖尿病研究 糖尿病研究
背景情况:
- 功能性β细胞质量的丧失是糖尿病的主要驱动因素.
- 富含白的重复含有G蛋白结合受体4 (LGR4) 存在于人类小岛,但其在β细胞健康中的作用尚不清楚.
- 核因子卡帕B (NFκB) 的受体激活剂 (RANK) 是已知的β细胞健康的负调节者.
研究的目的:
- 研究胰腺小岛中的Lgr4调节.
- 确定LGR4的作用及其与RANK在β细胞健康中的相互作用.
- 在基底和压力条件下评估LGR4功能,无论是体外还是体外.
主要方法:
- 在各种压力条件下 (细胞因子,高脂肪饮食,db/db小鼠,衰老) 评估了小鼠和人类小岛的Lgr4表达.
- 在实验室Lgr4功能丧失和功能获取研究中,在初级动物和人类β细胞中使用.
- 产生了特定于β细胞的条件淘汰赛小鼠 (Lgr4cko和Lgr4/Rank dko) 来评估体内角色.
主要成果:
- 在压力下Lgr4表达减少;Lgr4倒置损害了β细胞的增殖和生存,而过度表达则防止了细胞死亡.
- LGR4抑制RANK-TRAF6的相互作用,抑制NFκB的激活,并保护β细胞.
- Lgr4cko小鼠的β细胞死亡增加和增殖/成熟受损 (雌性),dko小鼠的表型恢复,老年Lgr4cko小鼠的恒温受损.
结论:
- 在基底和压力条件下,LGR4作为β细胞健康的新型积极调节剂.
- LGR4通过对抗RANK的有害作用来发挥其保护作用.
- 这些发现凸显了LGR4作为糖尿病潜在的治疗点.
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