The Troyer syndrome protein spartin mediates selective autophagy of lipid droplets.

The Troyer syndrome protein spartin mediates selective autophagy of lipid droplets.
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DOI:
10.1038/s41556-023-01178-w
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发表时间:
2023-08
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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脂滴是储存能量和维持脂质平衡的重要细胞器。LDS的自噬是其分解代谢的重要途径,但通过选择性自噬(脂噬)介导LD降解的分子机制尚不清楚。在这里,我们确定Sartin是一个受体,定位于LDS并与核心自噬机制相互作用,我们表明Sartin需要将LDS运送到溶酶体以动员甘油三酯。SPART(编码SPARN)的突变会导致Troyer综合征,这是一种复杂的遗传性痉挛截瘫。干扰培养的人类神经元或小鼠脑神经元的Sartin功能会导致LD和甘油三酯的积聚。因此,我们认为Sartin是一种脂噬受体,这表明LD周转受损有助于Troyer综合征的发生。Chung等人鉴定与Troyer综合征相关的蛋白Sartin,它是体外和体内清除脂滴的亲脂受体。这些数据表明,脂滴代谢受损可能是Troyer综合征发生的原因之一。
Lipid droplets (LDs) are crucial organelles for energy storage and lipid homeostasis. Autophagy of LDs is an important pathway for their catabolism, but the molecular mechanisms mediating LD degradation by selective autophagy (lipophagy) are unknown. Here we identify spartin as a receptor localizing to LDs and interacting with core autophagy machinery, and we show that spartin is required to deliver LDs to lysosomes for triglyceride mobilization. Mutations in SPART (encoding spartin) lead to Troyer syndrome, a form of complex hereditary spastic paraplegia. Interfering with spartin function in cultured human neurons or murine brain neurons leads to LD and triglyceride accumulation. Our identification of spartin as a lipophagy receptor, thus, suggests that impaired LD turnover contributes to Troyer syndrome development. Chung et al. identify the protein spartin, linked to Troyer syndrome, as a lipophagy receptor for lipid droplet clearance in vitro and in vivo. The data suggest that impaired lipid droplet turnover may contribute to Troyer syndrome development.
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发表时间: 2022-03-10
影响因子: 16.6
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