Identification and Characterization of the Dermal Panniculus Carnosus Muscle Stem Cells

• Main Authors: Neia Naldaiz-Gastesi, María Goicoechea, Sonia Alonso-Martín, Ana Aiastui, Macarena López-Mayorga, Paula García-Belda, Jaione Lacalle, Carlos San José, Marcos J. Araúzo-Bravo, Lidwine Trouilh, Véronique Anton-Leberre, Diego Herrero, Ander Matheu, Antonio Bernad, José Manuel García-Verdugo, Jaime J. Carvajal, Frédéric Relaix, Adolfo Lopez de Munain, Patricia García-Parra, Ander Izeta
• Format: Article
• Language: English
• Published: Elsevier 2016-09-01
• Series: Stem Cell Reports
• Online Access: http://www.sciencedirect.com/science/article/pii/S2213671116301527

The dermal Panniculus carnosus (PC) muscle is important for wound contraction in lower mammals and represents an interesting model of muscle regeneration due to its high cell turnover. The resident satellite cells (the bona fide muscle stem cells) remain poorly characterized. Here we analyzed PC satellite cells with regard to developmental origin and purported function. Lineage tracing shows that they originate in Myf5+, Pax3/Pax7+ cell populations. Skin and muscle wounding increased PC myofiber turnover, with the satellite cell progeny being involved in muscle regeneration but with no detectable contribution to the wound-bed myofibroblasts. Since hematopoietic stem cells fuse to PC myofibers in the absence of injury, we also studied the contribution of bone marrow-derived cells to the PC satellite cell compartment, demonstrating that cells of donor origin are capable of repopulating the PC muscle stem cell niche after irradiation and bone marrow transplantation but may not fully acquire the relevant myogenic commitment.