Abstract
Amyotrophic lateral sclerosis (ALS) is a devastating neurodegenerative disease characterized by dysfunction of the upper and lower motor neurons resulting in muscle weakness and wasting. Recently, several studies on ALS patients and ALS animal models indicated that intramuscular toxicity played a role in ALS disease progression; however, the mechanisms driving this are unknown. In this study, we explored the possible dysfunction of lipid metabolism in myocytes associated with ALS. Initially, skeletal muscle from 41 ALS patients, as well as 53 non-ALS control subjects, was investigated, and we identified that lipid droplet accumulation in the muscle fibers of ALS patients was significantly increased, especially in patients with FUS mutations. A myoblast (C2C12) cell line expressing mutant FUS (FUS-K510Q) was able to induce lipid droplet accumulation and mitochondrial dysfunction. Consistently, transgenic flies expressing FUS-K510Q under a muscle-specific driver showed elevated triglyceride levels in the flight muscles, as well as locomotor defects. Biochemical analysis of C2C12 cells and fly muscle tissues showed upregulation of PLIN2, and downregulation of ATGL and CPT1A, indicating inhibition of lipolysis and fatty acid β-oxidation in muscle cells with FUS mutations. Our study provided a potential explanation for the pathogenesis associated with lipid droplets accumulating in skeletal muscle in ALS. Our data also suggested that disordered lipid metabolism and mitochondrial dysfunction play a crucial role in intramuscular toxicity in ALS.
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Data Availability
The datasets analyzed in this study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank the patients and their families for cooperation. We thank Mr. Lijun Chai and Mr. ** Xu (Peking University First Hospital) for their work for electron microscopy pictures, and Ms. Yuehuan Zuo and Ms. Qiurong Zhang (Peking University First Hospital) for preparations of pathological sections.
Funding
This study was supported by funding from the National Natural Science Foundation of China (Grant Nos. 81371394, 81460199, 81540101, 31701004, and 82160252), Natural Science Foundation of Jiangxi province (20202BAB206029), Double thousand talents program of Jiangxi province (jxsq2019101021).
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ZB, DJ, LX, ZY, DH, ZY, ZM, and YY contributed to the acquisition and analysis of data. FX, ZM, and WZ performed the genetic analysis. YJ, ZW, and YY performed the pathological study. YY and WZ contributed to critical revision of the manuscript. ZB, DJ, and HD contributed to the study design and drafted the manuscript.
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The protocol was approved by the Ethics Committee of the First Affiliated Hospital of Nanchang University and the First Hospital of Peking University. All patients obtained informed consent to participate in the study.
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Supplemental Fig. S1.
Cytotoxicity of Ctr, Wt, K510Q assessed by CTG assay. Cells were treated with Ctr, Wt or K510Q adenovirus for 48h and cell viability determined using the CellTiter-Glo assay. Values shown are mean ± SD of a representative experiment performed in sextuplicate (****: p<0.0001). (PNG 29 kb)
Supplemental Fig. S2.
Expression of FUS-K510Q causes lipid droplets accumulation. A Oil Red O staining of C2C12 cells without OA treatment. B The lipid droplet ratio was calculated using Image-Pro Plus software (****: p<0.0001). (PNG 1527 kb)
Supplemental Fig. S3.
Expression of Ctr, Wt, K510Q causes disordered lipid metabolism. A Oil Red O staining of C2C12 cells under 0.25 mM OA treatment. B The lipid droplet ratio was measured and quantified using Image-Pro Plus software (**: p<0.01). (PNG 1096 kb)
Expression of FUS-K510Q causes locomotor defects in flies at 35 days old. Fly genotypes: Ctr: Mef2-Gal4/Tub-Gal80ts/W1118; FUS-K510Q: Mef2-Gal4/Tub-Gal80ts/UAS-K510Q-FUS (MP4 1638 kb)
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Zhou, B., Zheng, Y., Li, X. et al. FUS Mutation Causes Disordered Lipid Metabolism in Skeletal Muscle Associated with ALS. Mol Neurobiol 59, 7265–7277 (2022). https://doi.org/10.1007/s12035-022-03048-2
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DOI: https://doi.org/10.1007/s12035-022-03048-2