Activated TBK1 promotes ACSL1-mediated microglia lipid droplet accumulation and neuroinflammation in Parkinson’s disease

Activated TBK1 promotes ACSL1-mediated microglia lipid droplet accumulation and neuroinflammation in Parkinson’s disease

Abstract Microglia-mediated neuroinflammation plays a crucial role in the progression of Parkinson’s disease (PD). Dysregulation of lipid droplet homeostasis is a significant factor affecting microglial inflammatory responses, but the mechanisms underlying lipid droplet imbalance in PD are currently...

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Main Authors: Chunlei Han, Huizhi Wang, Moxuan Zhang, Liuliu Wu, Anni Wang, Pengda Yang, Yuan Gao, Chaonan Zhang, Jianing Gao, Tao Xue, Tingting Du, Yucheng Ji, Lin Shi, Chunkui Zhang, Renpeng Li, Yilei Xiao, Jianguo Zhang, Fangang Meng
Format: Article
Language:English
Published: BMC 2025-07-01
Series:Journal of Neuroinflammation
Subjects:
ACSL1
Parkinson’s disease
Microglia
Lipid droplet
Neuroinflammation
TBK1
Online Access:https://doi.org/10.1186/s12974-025-03517-0
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Summary:Abstract Microglia-mediated neuroinflammation plays a crucial role in the progression of Parkinson’s disease (PD). Dysregulation of lipid droplet homeostasis is a significant factor affecting microglial inflammatory responses, but the mechanisms underlying lipid droplet imbalance in PD are currently unclear. Here, we report a subtype of microglia characterized by high expression of long-chain acyl-CoA synthetase 1 (ACSL1) through single-nucleus RNA sequencing analysis and machine learning algorithms, linking lipid metabolism to PD neuroinflammation. The results of multiple loss- and gain-of-function experiments indicate that ACSL1 localized to the endoplasmic reticulum (ER) promotes lipid droplet accumulation to exacerbate microglial activation and dopaminergic neurons death. Mechanistically, activation of TANK-binding kinase 1 (TBK1) leads to the enrichment of ACSL1 on the endoplasmic reticulum, which generates acyl-CoA that are channelled for lipid droplet biogenesis. Additionally, high expression of ACSL1 promotes activation of TBK1 through Nrdp1-mediated K63 ubiquitination of TBK1, which triggers the amplification of the aforementioned biological effects. Moreover, NF-κB directly binds to the ACSL1 promoter and positively regulates its transcription, resulting in increased ACSL1 expression in microglia. Our findings suggest that manipulating lipid droplet biogenesis by modulating ACSL1 may be a potential strategy for treating neuroinflammation in PD patients.
ISSN:1742-2094

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