与肥胖相关的脂毒性机制和临床前景
1Faculty of Pharmacy, Department of Toxicology, Gazi University, Hipodrom, Ankara, Turkey. abengin@gmail.com.
Advances in experimental medicine and biology
|September 17, 2024
概括
细胞脂肪酸暴露会导致毒性,导致炎症和器官功能障碍. 针对脂质毒性途径的新型治疗策略在治疗代谢疾病方面表现有前途.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 代谢性疾病研究研究
背景情况:
- 细胞暴露于特定脂肪酸物种及其与毒性表型的联系尚不清楚.
- 人体血自由脂肪酸 (FFAs) 涉及有毒集群和转录对脂毒性压力的反应,有助于遗传风险因素.
- 与肥胖相关的过度缩脂肪细胞表现出脂质储存和胰岛素耐药性受损,加剧循环脂肪酸水平.
研究的目的:
- 阐明将细胞脂肪酸暴露与毒性表型联系在一起的机制.
- 识别参与调节脂毒性的基因和途径.
- 探索潜在的治疗点来管理脂毒性及其相关的健康后果.
主要方法:
- 全基因组短发针RNA (shRNA) 查,以确定调节脂毒性的基因.
- 对脂肪酸过载的细胞和分子反应的分析,包括脂质液滴的形成,胺和二甲酸甘油 (DAG) 的积累,以及内质网膜 (ER) 应激.
- 研究信号通路,如cAMP/蛋白激酶A (PKA),细胞外信号调节激酶 (Erk) 1/2,c-Jun N-终端激酶 (JNK),以及对脂肪酸的自反应.
- 药理干预和评估治疗方法对葡萄糖脂质毒性.
主要成果:
- 超过350个基因被确定为调节脂毒性.
- 过度的棕酸 (一种和脂肪酸) 过载会增加胺水平,导致对多个器官和慢性炎症的有害影响.
- 细胞内膜网膜应激可以诱导脂解,但JNK-自轴充当SFA诱导的细胞死亡的SFA诱导细胞死亡的亲生存机制.
- 细胞内网膜局部化乙-CoA:甘-3-酸盐乙转移酶 (GPAT) 酶调解脂毒性,它们的抑制是一种潜在的治疗策略.
- 脂肪酸脱化有助于棕酸排毒和甘油三储存.
- 脂毒性增加了自细胞的形成,可能抑制了自细胞的循环.
结论:
- 由细胞脂肪酸过载和相关炎症驱动的脂毒性,有助于β细胞功能障碍和器官损伤.
- 准ER局部化GPAT酶和调节JNK自轴为脂毒性提供治疗途径.
- 药理干预包括甲胺,GLP-1受体激动剂,PPARγ配体和伴侣剂,以及生活方式的修改,是控制葡萄糖脂质毒性的关键.
- 使用omega-3脂肪酸诱导棕色脂肪类型的表型为脂毒性提供了潜在的治疗策略.
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