G蛋白结合雌激素受体信号传递维持了雌性小鼠中的β细胞身份
bioRxiv : the preprint server for biology
|June 4, 2025
概括
与更年期相关的雌激醇 (E2) 信号损失可能会通过GPER损害胰腺β细胞的身份. 这一发现将E2缺乏与老年妇女的2型糖尿病风险联系在一起.
科学领域:
- 内分泌学 在内分泌学.
- 代谢疾病 代谢疾病
- 细胞生物学 细胞生物学
背景情况:
- 2型糖尿病 (T2D) 风险受肥胖,年龄和性别的影响,雌醇 (E2) 可能提供代谢保护.
- 在更年期期间,E2的代谢作用及其对胰腺β细胞功能的影响机制尚未完全理解.
研究的目的:
- 研究雌激醇 (E2) 信号在β细胞功能和身份中的作用,特别是在更年期的背景下.
- 探索E2,G蛋白结合雌激素受体 (GPER) 和β细胞身份之间的联系.
主要方法:
- 分析来自女性和男性捐赠者的人类小岛转录组数据集,以评估与年龄相关的基因表达变化.
- 卵巢切除 (OVX) 在雌性小鼠中,其次是高脂肪饮食 (HFD),以模拟更年期E2损失和代谢功能障碍.
- 以一种GPER特异性激动剂 (G-1) 进行ex vivo小岛治疗,以评估其对β细胞标记物的作用.
主要成果:
- 人类雌性小岛在贝塔细胞功能途径中显示出与年龄相关的基因表达变化,与雄性小岛不同.
- 接受HFD养的OVX小鼠发展出葡萄糖不耐受,α细胞质量增加,β细胞标记物减少.
- 活体GPER激活恢复了贝塔细胞身份基因表达在小岛上的表达.
结论:
- 绝经期间通过GPER传递E2信号的丧失可能导致β细胞身份的丧失.
- 这确定了GPER信号传递和β细胞身份之间的新联系,可能解释T2D发展中的性别差异.
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