黑素通过向STING来阻止NCOA4/ACSL4依赖的铁亡,以改善糖尿病认知功能障碍
Tao Xu1, Zhaoyu Xie1, Yongting Zhao2
1Department of Pharmacology, Wannan Medical College, Wuhu, China; Anhui Innovative Center for Drug Basic Research of Metabolic Diseases, Wannan Medical College, Wuhu, China.
Bioorganic chemistry
|December 19, 2025
概括
黑色素 (MLT) 通过抑制铁和ferritinophagy,改善糖尿病小鼠的记忆力. 它针对STING,减少有害的细胞过程,并防止糖尿病认知功能障碍.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 内分泌学 在内分泌学.
背景情况:
- 糖尿病认知功能障碍 (DCD) 是2型糖尿病 (T2DM) 的重要并发症.
- 底层DCD的精确分子机制,特别是铁和铁代谢的作用,仍然不完全理解.
- 黑素 (MLT) 显示出减轻脑损伤的潜力,但其对DCD的具体影响需要详细调查.
研究的目的:
- 阐明黑素改善糖尿病认知功能障碍的分子机制.
- 调查乙基-CoA合成酶长链家族成员4 (ACSL4) 依赖于铁和核受体协活性剂4 (NCOA4) 介导的铁代谢在DCD中的作用.
- 在DCD的背景下确定黑激素的直接分子标.
主要方法:
- 2型糖尿病 (T2DM) 鼠标模型中使用黑激素.
- 在体外研究中,使用暴露于高葡萄糖/棕酸 (HG + PA) 的神经元细胞.
- 生物化学测定测量脂质过氧化,GSH,SOD,Fe2+和ROS水平.
- 对 ACSL4,NCOA4 和 Ferritin 的表达分析.
- 包括表面等离子体共振,分子对接和细胞热转移分析在内的分子技术用于识别黑激素的标.
- 对STING (干扰素基因刺激器) 的药理和遗传操纵.
主要成果:
- 黑素的使用改善了T2DM小鼠的学习和记忆缺陷.
- 黑色素通过减少脂质过氧化和增加抗氧化剂水平 (GSH,SOD,GPX4) 减弱了ACSL4依赖性铁亡,同时降低了ACSL4表达的调节.
- 黑色素通过降低细胞内ROS和Fe2+水平并调节NCOA4和费里的表达,逆转了NCOA4介导的费里丁.
- 黑色素直接结合并抑制STING,破坏了NCOA4和ACSL4对STING的招募.
- 激活STING抵消了黑激素的保护作用,而抑制STING则增强了它们.
结论:
- 黑色素通过双重机制改善糖尿病认知功能障碍:抑制ACSL4依赖的铁和NCOA4介导的铁代谢.
- 黑色素通过直接准和抑制STING信号来实现这些效果.
- 这些发现揭示了一种新的治疗途径,用于管理涉及黑激素和STING调制的DCD.
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