Regulation of stem cell fate by HSPGs : implication in hair follicle cycling.

Bravo et merci à Charlie Colin Pierre et ses collaborateurs de l’équipe de Stéphane Brezillon (Université de Reims Champagne-Ardenne, Laboratoire MEDyC, CNRS UMR 7369) pour cette revue très complète en open access dans « Regenerative Medicine ».  Colin-Pierre C, El Baraka O, Danoux L, Bardey V, André V, Ramont L, Brézillon S. NPJ Regen Med. 2022 Dec 28;7(1):77. PMID: 36577752.

Heparan sulfate proteoglycans (HSPGs) are part of proteoglycan family. They are composed of heparan sulfate (HS)-type glycosaminoglycan (GAG) chains covalently linked to a core protein. By interacting with growth factors and/or receptors, they regulate numerous pathways including Wnt, hedgehog (Hh), bone morphogenic protein (BMP) and fibroblast growth factor (FGF) pathways. They act as inhibitor or activator of these pathways to modulate embryonic and adult stem cell fate during organ morphogenesis, regeneration and homeostasis. This review summarizes the knowledge on HSPG structure and classification and explores several signaling pathways regulated by HSPGs in stem cell fate. A specific focus on hair follicle stem cell fate and the possibility to target HSPGs in order to tackle hair loss are discussed in more dermatological and cosmeceutical perspectives.