针对β细胞K ((ATP) 通道的向过度活跃会诱导严重的新生儿糖尿病
J C Koster1, B A Marshall, N Ensor
1The Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
Cell
|April 13, 2000
概括
在β细胞K ((ATP) 通道中改变ATP敏感性会损害胰岛素分泌,导致严重的高血糖和糖尿病. 正常的通道功能对于维持血糖平衡至关重要.
科学领域:
- 细胞和分子生物学 细胞和分子生物学
- 内分泌学 在内分泌学.
- 生理学 生理学 生理学
背景情况:
- 胰岛素分泌受到葡萄糖代谢的调节,这会影响胰腺β细胞中的ATP/ADP水平.
- 细胞质ATP/ADP比率升高,关闭K ((ATP) 通道,导致β细胞脱极化,流入和胰岛素释放.
- 功能障碍的K ((ATP) 通道与ATP敏感性降低被假设通过损害胰岛素分泌导致糖尿病.
研究的目的:
- 研究K ((ATP) 通道ATP敏感性在调节胰岛素分泌和维持高血糖的作用.
- 测试预测,降低K ((ATP) 通道对ATP/ADP的响应性会导致糖尿病.
- 确定正常的K ((ATP) 通道活性对葡萄糖恒温的关键重要性.
主要方法:
- 产生表达β细胞K ((ATP) 通道的转基因小鼠,其ATP敏感性降低.
- 在转基因小鼠中监测生理参数,包括血糖,胰岛素水平和酸性脂肪.
- 胰腺小岛的组织学检查,以评估细胞形态和分布.
主要成果:
- 转基因小鼠在出生后几天内迅速发展出严重的高血糖症,低胰岛素症和酸性脂肪酸症.
- 观察到的表型迅速致命,大多数动物在5天内死亡.
- 岛屿形态,胰岛素定位和α/β细胞分布在第3天之前仍然正常,这表明胰岛素分泌减少是主要原因.
- 这些发现强烈支持这样一个假设,即受损的K ((ATP) 通道功能直接抑制胰岛素分泌.
结论:
- 贝塔细胞中正常的K(ATP) 道活性对于维持血糖水平 (高血糖症) 是必不可少的.
- 过度活跃或降低K ((ATP)) 通道的敏感性可以通过抑制胰岛素分泌引起糖尿病.
- 这项研究突出了K ((ATP) 通道作为胰岛素分泌的关键调节者和糖尿病的潜在治疗点.
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