Nonmyelinating Schwann Cells Maintain Hematopoietic Stem Cell Hibernation in the Bone Marrow Niche
Författare
Summary, in English
Hematopoietic stem cells (HSCs) reside and self-renew in the bone marrow (BM) niche. Overall, the signaling that regulates stem cell dormancy in the HSC niche remains controversial. Here, we demonstrate that TGF-beta type II receptor-deficient HSCs show low-level Smad activation and impaired long-term repopulating activity, underlining the critical role of TGF-beta/Smad signaling in HSC maintenance. TGF-b is produced as a latent form by a variety of cells, so we searched for those that express activator molecules for latent TGF-beta. Nonmyelinating Schwann cells in BM proved responsible for activation. These glial cells ensheathed autonomic nerves, expressed HSC niche factor genes, and were in contact with a substantial proportion of HSCs. Autonomic nerve denervation reduced the number of these active TGF-beta-producing cells and led to rapid loss of HSCs from BM. We propose that glial cells are components of a BM niche and maintain HSC hibernation by regulating activation of latent TGF-beta.
Avdelning/ar
Publiceringsår
2011
Språk
Engelska
Sidor
1146-1158
Publikation/Tidskrift/Serie
Cell
Volym
147
Issue
5
Dokumenttyp
Artikel i tidskrift
Förlag
Cell Press
Ämne
- Hematology
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1097-4172