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Cell Stem Cell. 2016 Oct 6;19(4):433-448. doi: 10.1016/j.stem.2016.06.002. Epub 2016 Jul 1.

Dedifferentiated Schwann Cell Precursors Secreting Paracrine Factors Are Required for Regeneration of the Mammalian Digit Tip.

Author information

1
Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 1L7, Canada. Electronic address: adjohnston@upei.ca.
2
Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 1L7, Canada.
3
Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 1L7, Canada; Institute of Medical Sciences, University of Toronto, Toronto, ON M5G 1A8, Canada.
4
Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 1L7, Canada; Department of Physiology, University of Toronto, Toronto, ON M5G 1A8, Canada.
5
Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 1L7, Canada; Institute of Medical Sciences, University of Toronto, Toronto, ON M5G 1A8, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1A8, Canada.
6
Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 1L7, Canada; Institute of Medical Sciences, University of Toronto, Toronto, ON M5G 1A8, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1A8, Canada; Department of Physiology, University of Toronto, Toronto, ON M5G 1A8, Canada. Electronic address: fredam@sickkids.ca.

Abstract

Adult mammals have lost multi-tissue regenerative capacity, except for the distal digit, which is able to regenerate via mechanisms that remain largely unknown. Here, we show that, after adult mouse distal digit removal, nerve-associated Schwann cell precursors (SCPs) dedifferentiate and secrete growth factors that promote expansion of the blastema and digit regeneration. When SCPs were dysregulated or ablated, mesenchymal precursor proliferation in the blastema was decreased and nail and bone regeneration were impaired. Transplantation of exogenous SCPs rescued these regeneration defects. We found that SCPs secrete factors that promote self-renewal of mesenchymal precursors, and we used transcriptomic and proteomic analysis to define candidate factors. Two of these, oncostatin M (OSM) and platelet-derived growth factor AA (PDGF-AA), are made by SCPs in the regenerating digit and rescued the deficits in regeneration caused by loss of SCPs. As all peripheral tissues contain nerves, these results could have broad implications for mammalian tissue repair and regeneration.

PMID:
27376984
DOI:
10.1016/j.stem.2016.06.002
[Indexed for MEDLINE]
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