title: Bone marrow Schwann cells induce hematopoietic stem cell hibernation.
abstract: Hematopoietic stem cells (HSCs) are clonogenic cells capable of both self-renewal and multilineage differentiation. In adult mouse bone marrow (BM), most HSCs remain in the non-dividing G0-phase of cell cycle, in close contact with supporting cells known as the HSC "niche". In the present study, we focused on signaling mechanisms that regulate stem cell dormancy in the BM niche. We show that TGF-β type II receptor deficiency causes reduced phosphorylation of Smad2/3 and impairs long-term repopulating activity in HSCs, suggesting a significant role for TGF-β/Smad signaling in hematopoiesis. Furthermore, we aimed at defining the candidate BM niche responsible for homeostasis of hematopoiesis, and revealed that non-myelinating Schwann cells sustain HSC hibernation by converting TGF-β from its latent to its active form.
authors.affiliation: Laboratory of Stem Cell Therapy, Center for Experimental Medicine, The Institute of Medical Science, University of Tokyo, Tokyo, 108-8639, Japan, y-sato4@ims.u-tokyo.ac.jp.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yamazaki
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Nakauchi
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000378:metabolism; D001854:Bone Marrow Cells / Q000378:metabolism*; D002450:Cell Communication; D002453:Cell Cycle; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000378:metabolism*; D006801:Humans; D051379:Mice; D018345:Mice, Knockout; D009419:Nerve Tissue Proteins / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism; D000077294:Receptor, Transforming Growth Factor-beta Type II; D018125:Receptors, Transforming Growth Factor beta / Q000235:genetics / Q000378:metabolism; D012583:Schwann Cells / Q000378:metabolism*; D051899:Smad2 Protein / Q000378:metabolism; D051900:Smad3 Protein / Q000378:metabolism; D013562:Sympathectomy; D016212:Transforming Growth Factor beta / Q000378:metabolism
chemical_list: D009419:Nerve Tissue Proteins; D018125:Receptors, Transforming Growth Factor beta; D051899:Smad2 Protein; D051900:Smad3 Protein; D016212:Transforming Growth Factor beta; D017346:Protein Serine-Threonine Kinases; D000077294:Receptor, Transforming Growth Factor-beta Type II