在糖尿病相关的认知障碍中,TREM1通过PERK途径诱导微质铁亡
Yujing Zhao1, Hongyan Guo1, Qiao Li2
1Department of Anesthesiology & Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, Shaanxi, China.
Experimental neurology
|October 26, 2024
概括
糖尿病相关的认知障碍包括微质铁亡. 在骨髓细胞1 (TREM1) 上表达的触发受体加剧了微质中的铁积累和氧化应激,导致认知能力下降. 抑制TREM1可能是一种治疗策略.
科学领域:
- 神经科学是一个神经科学.
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
背景情况:
- 铁亡是一种受调节的细胞死亡形式,与神经退行性疾病 (如糖尿病相关认知障碍 (DACI)) 有关.
- 微质细胞,大脑的中央免疫细胞,具有铁积累的特性,但它们在DACI中的作用和调节机制尚不清楚.
- 在骨髓细胞1 (TREM1) 上表达的触发受体作为微细胞特异性炎症放大剂.
研究的目的:
- 研究铁沉积在微质中的作用及其在DACI中的调节机制.
- 探索DACI中抑制TREM1的治疗潜力.
主要方法:
- 在细胞系 (BV2/HMC3) 和小鼠中建立了高葡萄糖 (HG) 和糖尿病 (HFD/STZ) 模型.
- 评估了铁亡标志物 (Fe2+,GSH/GSSG,MDA,ROS),铁沉积 (普鲁士蓝色染色) 和认知功能 (Y迷宫,新型物体识别).
- 利用LP17作为特定的TREM1抑制剂和GSK2606414作为PERK通路抑制剂.
主要成果:
- DACI小鼠在海马微质中表现出铁沉积增加和抗氧化剂减少,同时TREM1表达升高.
- 通过减少微质铁积累和氧化应激,LP17治疗改善了认知障碍.
- 高葡萄糖诱导了微质中的铁亡,而LP17和铁亡抑制剂 (Fer-1) 阻断了这一过程.
- 抑制TREM1和抑制PERK通路逆转了微质中的HG诱导的铁亡.
结论:
- TREM1通过PERK途径加剧与T2DM相关的微质铁积累,从而导致内质网膜应激 (ERS).
- 这一过程导致抗氧化剂失活,脂质过氧化和铁,最终导致认知障碍.
- 针对TREM1为DACI提供了一个潜在的治疗策略.
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