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胰腺β细胞的内激素反应是由线粒体转胺酶GPT2调节的

Sabyasachi Sen¹, Andrea V Rozo¹, Matthew W Haemmerle¹

¹Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.

Research square

|July 9, 2025

概括

沉默GPT2增强胰腺β细胞对胰岛素激素的反应,改善2型糖尿病的葡萄糖控制. 这一发现确定了GPT2作为β细胞功能障碍的潜在治疗标.

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:

胰岛素激素 (GLP-1和GIP) 对于胰腺β细胞功能至关重要,并且是2型糖尿病 (T2D) 治疗的向.
随着T2D的进展,英克雷丁的作用会减弱,导致β细胞功能障碍.

研究的目的:

调查线粒体蛋白GPT2在调节β细胞对隐形素反应中的作用.
确定是否准GPT2可以恢复T2D中的隐素敏感性.

主要方法:

产生β细胞特异性Gpt2缺乏的小鼠 (Gpt2^βKO).
用于T2D的饮食诱导肥胖 (DIO) 模型.
评估葡萄糖耐受性,胰岛素分泌和β细胞存活率,以应对因克列受体激动.
从T2D捐赠者和在葡萄糖脂质毒性条件下的人类岛屿中检查了GPT2表达.
在人类β细胞和T2D小岛中抑制了GPT2.

主要成果:

Gpt2^βKO小鼠表现出改善的葡萄糖耐受性和胰岛素分泌,这是由于增强的β细胞因克雷丁敏感性.
在DIO模型中的Gpt2^βKO小鼠显示较低的葡萄糖水平和更好的代谢控制.
GLP-1受体激素对β细胞存活的影响在Gpt2^βKO小岛中被放大.
在人类T2D小岛和葡萄糖脂质毒性下,GPT2表达升高.
人类β细胞中GPT2沉默改善了隐形素敏感性和存活率,扭转了T2D相关的不响应.

结论:

GPT2 负面调节了β细胞的内素反应和功能.
在T2D中,GPT2是上调调节的,有助于β细胞功能障碍.
沉默GPT2恢复了因克雷丁的敏感性,并提高了β细胞的存活率,为T2D提供了潜在的治疗策略.

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