葡萄糖感应碳水化合物反应元素结合蛋白在糖尿病视网膜病变的发病过程中
Christopher R Starr1, Assylbek Zhylkibayev2, Oleg Gorbatyuk3
1Department of Ophthalmology, School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35233, USA.
Cells
|January 24, 2025
概括
在视网膜中过度表达碳水化合物敏感元素结合蛋白 (ChREBP) 会导致代谢重编程和功能损失,从而导致糖尿病视网膜病变 (DR) 的发病.
科学领域:
- 眼科和视觉科学 眼科和视觉科学
- 代谢研究研究 代谢研究
- 分子生物学分子生物学
背景情况:
- 葡萄糖感应转录因子ChREBP和MondoA是代谢途径的关键调节者,但它们在眼部疾病中的作用仍未得到充分研究.
- 糖尿病视网膜病变 (DR) 是糖尿病的一种严重并发症,其特征是逐渐失去视力,其潜在的分子机制需要进一步阐明.
研究的目的:
- 调查ChREBP在糖尿病视网膜病变 (DR) 发病过程中的作用.
- 探索ChREBP激活对视网膜功能和分子变化的影响.
主要方法:
- 人类和老鼠视网膜冷切割的免疫组织化学.
- 定量实时PCR (qRT-PCR) 用于基因表达分析.
- 构成性活跃的ChREBP (caChREBP) 转基因小鼠 (caChREBPRP) 的生成,用于杆特异性研究.
- 视网膜功能测试 (电视网膜学).
- 使用液体染色学质谱法 (LC-MS) 进行蛋白质组分析.
- 用表达人类ChREBP (ARPE-19ChREBP) 的lentiviral颗粒感染ARPE-19细胞,随后进行全球蛋白质组学.
主要成果:
- ChREBP和MondoA都在视网膜表达,在DR中观察到的水平较高.
- 在caChREBPRP小鼠中 Rod 特定的 ChREBP 激活导致了可视电网红图 (ERG) 幅度的降低,表明了棒光受体功能障碍.
- 视网膜蛋白质组分析显示了与光传导,氨基酸代谢和细胞粘附相关的改变KEGG通路.
- 过度表达ChREBP诱导了TXNIP的表达,并促进了ARPE-19ChREBP细胞中转向氧酸盐信号传递,糖代谢和 lysosomal激活的代谢转变.
结论:
- 在糖尿病视网膜病变的发病过程中,ChREBP扮演着重要的角色.
- 过度表达ChREBP会诱导视网膜细胞内的大量代谢重编程,导致功能缺陷和潜在的光受体退化.
- 准ChREBP介导的代谢途径可能为管理糖尿病视网膜病变提供一种新的治疗策略.
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