title: Hair follicle dermal stem cells regenerate the dermal sheath, repopulate the dermal papilla, and modulate hair type.
abstract: The dermal papilla (DP) provide instructive signals required to activate epithelial progenitors and initiate hair follicle regeneration. DP cell numbers fluctuate over the hair cycle, and hair loss is associated with gradual depletion/atrophy of DP cells. How DP cell numbers are maintained in healthy follicles remains unclear. We performed in vivo fate mapping of adult hair follicle dermal sheath (DS) cells to determine their lineage relationship with DP and found that a subset of DS cells are retained following each hair cycle, exhibit self-renewal, and repopulate the DS and the DP with new cells. Ablating these hair follicle dermal stem cells and their progeny retarded hair regrowth and altered hair type specification, suggesting that they function to modulate normal DP function. This work identifies a bipotent stem cell within the adult hair follicle mesenchyme and has important implications toward restoration of hair growth after injury, disease, and aging.
authors.affiliation: Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada.
authors.forename: Waleed
authors.initials: W
authors.lastname: Rahmani
authors.affiliation: Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada.
authors.forename: Sepideh
authors.initials: S
authors.lastname: Abbasi
authors.affiliation: Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada.
authors.forename: Andrew
authors.initials: A
authors.lastname: Hagner
authors.affiliation: Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada.
authors.forename: Eko
authors.initials: E
authors.lastname: Raharjo
authors.affiliation: Hotchkiss Brain Institute, University of Calgary, Calgary, AB T2N 4N1, Canada.
authors.forename: Ranjan
authors.initials: R
authors.lastname: Kumar
authors.affiliation: CiRA, Kyoto University, Kyoto 606-8507, Japan.
authors.forename: Akitsu
authors.initials: A
authors.lastname: Hotta
authors.affiliation: University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
authors.forename: Scott
authors.initials: S
authors.lastname: Magness
authors.affiliation: Institut de Génétique et de biologie Moléculaire et Cellulaire, INSERM U964, CNRS UMR 7104, Université de Strasbourg, BP 10142 Illkirch Cedex, France.
authors.forename: Daniel
authors.initials: D
authors.lastname: Metzger
authors.affiliation: Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada; Department of Surgery, Faculty of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada; Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB T2N 4N1, Canada; Hotchkiss Brain Institute, University of Calgary, Calgary, AB T2N 4N1, Canada. Electronic address: jeff.biernaskie@ucalgary.ca.
authors.forename: Jeff
authors.initials: J
authors.lastname: Biernaskie
mesh_terms: D000818:Animals; D002455:Cell Division; D002478:Cells, Cultured; D020405:Dermis / Q000166:cytology*; D004847:Epithelial Cells / Q000166:cytology; D006197:Hair / Q000254:growth & development*; D018859:Hair Follicle / Q000166:cytology* / Q000378:metabolism; D008648:Mesoderm / Q000166:cytology*; D051379:Mice; D012038:Regeneration / Q000502:physiology; D013234:Stem Cells / Q000166:cytology*