RRC ID 60093
Author Akiyama T, Suzuki N, Ishikawa M, Fujimori K, Sone T, Kawada J, Funayama R, Fujishima F, Mitsuzawa S, Ikeda K, Ono H, Shijo T, Osana S, Shirota M, Nakagawa T, Kitajima Y, Nishiyama A, Izumi R, Morimoto S, Okada Y, Kamei T, Nishida M, Nogami M, Kaneda S, Ikeuchi Y, Mitsuhashi H, Nakayama K, Fujii T, Warita H, Okano H, Aoki M.
Title Aberrant axon branching via Fos-B dysregulation in FUS-ALS motor neurons.
Journal EBioMedicine
Abstract BACKGROUND:The characteristic structure of motor neurons (MNs), particularly of the long axons, becomes damaged in the early stages of amyotrophic lateral sclerosis (ALS). However, the molecular pathophysiology of axonal degeneration remains to be fully elucidated.
METHOD:Two sets of isogenic human-induced pluripotent stem cell (hiPSCs)-derived MNs possessing the single amino acid difference (p.H517D) in the fused in sarcoma (FUS) were constructed. By combining MN reporter lentivirus, MN specific phenotype was analyzed. Moreover, RNA profiling of isolated axons were conducted by applying the microfluidic devices that enable axon bundles to be produced for omics analysis. The relationship between the target gene, which was identified as a pathological candidate in ALS with RNA-sequencing, and the MN phenotype was confirmed by intervention with si-RNA or overexpression to hiPSCs-derived MNs and even in vivo. The commonality was further confirmed with other ALS-causative mutant hiPSCs-derived MNs and human pathology.
FINDINGS:We identified aberrant increasing of axon branchings in FUS-mutant hiPSCs-derived MN axons compared with isogenic controls as a novel phenotype. We identified increased level of Fos-B mRNA, the binding target of FUS, in FUS-mutant MNs. While Fos-B reduction using si-RNA or an inhibitor ameliorated the observed aberrant axon branching, Fos-B overexpression resulted in aberrant axon branching even in vivo. The commonality of those phenotypes was further confirmed with other ALS causative mutation than FUS.
INTERPRETATION:Analyzing the axonal fraction of hiPSC-derived MNs using microfluidic devices revealed that Fos-B is a key regulator of FUS-mutant axon branching. FUND: Japan Agency for Medical Research and development; Japanese Ministry of Education, Culture, Sports, Science and Technology Clinical Research, Innovation and Education Center, Tohoku University Hospital; Japan Intractable Diseases (Nanbyo) Research Foundation; the Kanae Foundation for the Promotion of Medical Science; and "Inochi-no-Iro" ALS research grant.
Volume 45
Pages 362-378
Published 2019-7-1
DOI 10.1016/j.ebiom.2019.06.013
PII S2352-3964(19)30388-3
PMID 31262712
PMC PMC6642224
MeSH Amyotrophic Lateral Sclerosis / genetics* Amyotrophic Lateral Sclerosis / pathology Animals Axons / metabolism Axons / pathology Cell Differentiation / genetics Cell Line Gene Editing / methods High-Throughput Nucleotide Sequencing Humans Induced Pluripotent Stem Cells / metabolism Lentivirus / genetics Motor Neurons / metabolism Mutation Neurogenesis / genetics Phenotype Proto-Oncogene Proteins c-fos / genetics* RNA, Small Interfering / genetics RNA-Binding Protein FUS / genetics*
IF 6.68
Times Cited 4
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