细胞溶液pH是环境线索与胰腺β细胞中的胰岛素处理和分泌的直接联系
Yujiang Fang1, Hexi Feng1, Bowen Zhang1
1Translational Medical Center for Stem Cell Therapy, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai, China; Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital, School of Medicine, Tongji University, Shanghai, China; Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration of Ministry of Education, Orthopaedic Department of Tongji Hospital, Shanghai, China; Shanghai Institute of Stem Cell Research and Clinical Translation, Shanghai, China.
胰腺β细胞中的细胞质pH (pHc) 与葡萄糖一起上升,激活Smad5,调节胰岛素分泌. Smad5 缺乏导致高血糖,而其调节改善了小鼠的葡萄糖不耐受性.
科学领域:
- 细胞生物学 细胞生物学
- 代谢疾病 代谢疾病
- 内分泌学 在内分泌学.
背景情况:
- 胰腺β细胞通过胰岛素处理和分泌来调节葡萄糖平衡.
- 这些过程的失调与代谢疾病有关.
- 针对微环境和内在状态调节β细胞功能的精确机制尚未完全理解.
研究的目的:
- 研究细胞溶液pH (pHc) 在调节胰腺β细胞功能的作用.
- 确定参与感知pHc变化及其对胰岛素分泌的影响的分子参与者.
- 探索pHc,Smad5和代谢功能障碍之间的联系.
主要方法:
- 在β细胞中测量细胞溶液pH值.
- 在β细胞中对Smad5进行基因操纵.
- 评估胰岛素的处理和分泌.
- 野生类型和转基因小鼠的葡萄糖耐受性测试.
- 高脂肪饮食 (HFD) 诱导的代谢疾病模型.
主要成果:
- 葡萄糖挑战会增加β细胞中的细胞溶液pH (pHc).
- 根据pHc,Smad5在细胞核和细胞质之间穿.
- 在β细胞中Smad5缺乏导致高血糖和葡萄糖不耐受.
- Smad5调节胰岛素颗粒酸化的V-ATPase活性.
- 基因Smad5突变或性水的使用改善了HFD养小鼠的葡萄糖不耐受.
结论:
- 细胞质 pH 是胰腺β细胞功能的关键调节者.
- Smad5充当pH传感器,将环境线索与胰岛素分泌联系起来.
- 在V-ATPase调节中Smad5的非正规作用对于胰岛素颗粒酸化至关重要.
- 向pHc或Smad5可能为糖尿病等代谢疾病提供治疗策略.
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