谷氨诱导Keap1 S-谷氨基化并通过激活Nrf2缓解振荡性葡萄糖诱导的β细胞功能障碍
Xiufang Chen1, Qian Zhou1, Huamin Chen1
1Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou 325035, China.
谷氨酸 (GSH) 通过激活Nrf2通路来防止由葡萄糖诱导的振荡性胰腺β细胞衰竭. 这种抗氧化剂增强了Keap1的S-氨基化,促进了Nrf2核转位,恢复了β细胞的功能.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 内分泌学 在内分泌学.
背景情况:
- 谷氨 (GSH) 是一个关键的内源抗氧化剂,参与蛋白质氧化还原调节.
- 之前的研究表明,GSH可以防止β细胞衰竭和糖尿病前期从振荡葡萄糖 (OsG) 中发生,但机制尚不清楚.
研究的目的:
- 阐明GSH对OSG诱导的β细胞功能障碍的保护机制.
- 研究GSH在调节胰腺β细胞中Nrf2信号传递中的作用.
主要方法:
- 在体外和体内研究使用慢性OSG给药的老鼠模型.
- 对Nrf2和下游基因表达的分析 (Grx1,HO-1,GCLC,NQO1).
- 评估β细胞的亡,分离,胰岛素分泌和Keap1 S-氨基化.
主要成果:
- 在β细胞中,GSH逆转了OSG诱导的Nrf2,Grx1和HO-1水平的降低.
- GSH阻止了OsG诱导的β细胞脱差,细胞亡和胰岛素分泌受损.
- 通过在特定部位增强Keap1 S-氨基化,GSH促进了Nrf2核转位,Nrf2抑制剂阻断了这种效应.
结论:
- 部分通过增强Keap1 S-氨基化和激活Nrf2信号通路来保护GSH免受OSG诱导的β细胞衰竭.
- 这些发现为预防和治疗前糖尿病和糖尿病患者的β细胞衰竭提供了洞察力.
- GSH显示出作为治疗治疗剂的潜力,用于控制影响β细胞的代谢障碍.
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