1. TDP-43 mediates SREBF2-regulated gene expression required for oligodendrocyte myelination.
- Author
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Ho WY, Chang JC, Lim K, Cazenave-Gassiot A, Nguyen AT, Foo JC, Muralidharan S, Viera-Ortiz A, Ong SJM, Hor JH, Agrawal I, Hoon S, Arogundade OA, Rodriguez MJ, Lim SM, Kim SH, Ravits J, Ng SY, Wenk MR, Lee EB, Tucker-Kellogg G, and Ling SC
- Subjects
- Animals, DNA-Binding Proteins deficiency, Disease Models, Animal, Female, Frontal Lobe metabolism, Frontal Lobe pathology, Frontotemporal Dementia metabolism, Frontotemporal Dementia pathology, Gene Expression Profiling, Gene Expression Regulation, Humans, Hydroxymethylglutaryl-CoA Synthase genetics, Hydroxymethylglutaryl-CoA Synthase metabolism, Lipid Metabolism genetics, Male, Mice, Mice, Inbred C57BL, Mice, Knockout, Myelin Sheath pathology, Oligodendroglia pathology, Organoids metabolism, Organoids pathology, Primary Cell Culture, Receptors, LDL genetics, Receptors, LDL metabolism, Signal Transduction, Spinal Cord metabolism, Spinal Cord pathology, Sterol Regulatory Element Binding Protein 2 metabolism, Temporal Lobe metabolism, Temporal Lobe pathology, Cholesterol metabolism, DNA-Binding Proteins genetics, Frontotemporal Dementia genetics, Myelin Sheath metabolism, Oligodendroglia metabolism, Sterol Regulatory Element Binding Protein 2 genetics
- Abstract
Cholesterol metabolism operates autonomously within the central nervous system (CNS), where the majority of cholesterol resides in myelin. We demonstrate that TDP-43, the pathological signature protein for amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD), influences cholesterol metabolism in oligodendrocytes. TDP-43 binds directly to mRNA of SREBF2, the master transcription regulator for cholesterol metabolism, and multiple mRNAs encoding proteins responsible for cholesterol biosynthesis and uptake, including HMGCR, HMGCS1, and LDLR. TDP-43 depletion leads to reduced SREBF2 and LDLR expression, and cholesterol levels in vitro and in vivo. TDP-43-mediated changes in cholesterol levels can be restored by reintroducing SREBF2 or LDLR. Additionally, cholesterol supplementation rescues demyelination caused by TDP-43 deletion. Furthermore, oligodendrocytes harboring TDP-43 pathology from FTD patients show reduced HMGCR and HMGCS1, and coaggregation of LDLR and TDP-43. Collectively, our results indicate that TDP-43 plays a role in cholesterol homeostasis in oligodendrocytes, and cholesterol dysmetabolism may be implicated in TDP-43 proteinopathies-related diseases., (© 2021 Ho et al.)
- Published
- 2021
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