拉姆托1通过TRPML1的抑制来调节海马神经元中的树突性溶酶体定位
Jiandong Sun1, Weiju Lin1, Xiaoning Hao1
1College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, CA, United States.
Frontiers in cellular neuroscience
|December 9, 2024
概括
神经元中的 lysosomal 定位由 LAMTOR1 和 TRPML1.1 调节. 通常情况下,LAMTOR1会抑制TRPML1,但破坏这种相互作用会导致树突中溶酶体的积聚.
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.
- 分子生物学分子生物学
背景情况:
- 细胞内溶酶体的运输和定位对于神经元功能至关重要.
- 关键的调节器包括过时受体潜在粘合蛋白1 (TRPML1) 通道和Ragulator复合体.
- LAMTOR1,一个Ragulator子单元,和TRPML1都与溶酶体动力学有关.
研究的目的:
- 为了研究LAMTOR1在调节海马神经元树突中的 lysosomal 定位中的作用.
- 阐明LAMTOR1和TRPML1在控制 lysosomal 分布中的相互作用.
主要方法:
- 在培养的海马神经元中利用了LAMTOR1 knockdown (KD) 和TRPML1 KD.
- 使用TRPML1激活剂ML-SA1和一个TAT诱来破坏LAMTOR1-TRPML1的相互作用.
- 评估了 lysosomal 定位,并使用 dynein 抑制剂 ciliobrevin D 来探测运输机制.
主要成果:
- LAMTOR1 KD导致近端树突中的溶酶体积累,这被TRPML1 KD或抑制逆转.
- 激活TRPML1或破坏其与LAMTOR1的相互作用也诱导了树突性溶解体积累.
- 丁氨酸抑制阻断了LAMTOR1 KD诱导的溶酶体积累,表明丁氨酸介导的运输参与.
结论:
- 通过LAMTOR1介导的TRPML1抑制对于神经元树突中的正常溶酶体分布至关重要.
- 这种抑制或直接TRPML1激活的破坏会导致异常的溶酶体定位.
- LAMTOR1-TRPML1相互作用是溶酶体贩运的一个关键因素,对认知障碍有影响.
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