通过与胆固醇相关的途径,LRRK2和RAB8A通过巨细胞中溶解体损伤后调节细胞死亡
Josefine Fussing Tengberg1, Francesco Russo2, Tau Benned-Jensen3
1Neuroscience, Molecular and Single Cell Pharmacology, H. Lundbeck A/S, Valby, 2500 Copenhagen, Denmark; Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark.
Neurobiology of disease
|November 9, 2024
概括
激活氨酸丰富的重复激酶2 (LRRK2) 突变与帕金森病有关. 这项研究表明LRRK2抑制和溶酶体胆固醇保护细胞免受溶酶体损伤,揭示了一种新的治疗途径.
科学领域:
- 细胞生物学 细胞生物学
- 神经科学是一个神经科学.
- 遗传学 遗传学 是一个
背景情况:
- 氨酸丰富的重复激酶2 (LRRK2) 的激活突变是帕金森病 (PD) 的常见遗传原因.
- 将LRRK2突变与PD病变发生的确切机制尚不清楚,但证据表明LRRK2在调节 lysosomal 功能中的作用.
- 之前的研究表明,LRRK2在损伤时被招募到溶解体中,增加RAB GTPase基质的酸化.
研究的目的:
- 为了研究溶酶体损伤和LRRK2信号传递之间的功能相互作用.
- 为了确定LRRK2激酶抑制是否可以防止溶酶体应激诱导的细胞死亡.
- 阐明受LLOMe诱导的溶酶体损伤和LRRK2抑制影响的下游途径,重点关注胆固醇生物合成.
主要方法:
- 使用了RAW 264.7巨细胞,用 lysosomotropic化合物LLOMe治疗,以诱导 lysosomal损伤.
- 评估了细胞死亡,溶酶体通透性 (lysotracker) 和LRRK2信号通路活性.
- 采用siRNA介导的LRRK2和RABGTPases的淘汰,以及RNA测序和胆固醇代谢调节 (U18666A).
主要成果:
- LRRK2激酶抑制显著减少了LLOMe诱导的细胞死亡,证明了 lysosomal损伤和LRRK2.2之间的双向相互作用.
- 抑制LRRK2特别减弱了由 lysosomal 压力因子引起的细胞死亡,而不是其他细胞死亡诱导剂,并调节了透后的细胞反应.
- 敲除LRRK2和RAB8A,但不包括其他RAB,减弱了LLOMe诱导的细胞死亡. RNA测序揭示了LLOMe对胆固醇生物合成基因的下调,而LRRK2抑制逆转了这种情况.
- 溶解体胆固醇积累 (通过U18666A) 减少了LLOMe诱导的细胞死亡,这种效应与LRRK2抑制重叠,表明共享的机制.
结论:
- 这项研究证明了一种依赖LRRK2和RAB8A的机制,可以减轻RAW 264.7细胞在溶解体损伤后的细胞死亡.
- 溶解体胆固醇水平在调节这种保护通路方面发挥着至关重要的作用,表明LRRK2,溶解体功能和细胞存活中的脂质代谢之间存在联系.
- 这些发现为帕金森病的发病过程提供了新的见解,并提出了针对LRRK2和溶酶体胆固醇平衡的潜在治疗策略.
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