Notch Signaling Rescues Loss of Satellite Cells Lacking Pax7 and Promotes Brown Adipogenic Differentiation

Cell Reports

Natasha C. Chang¹  Sharlene Faulkes¹  Melanie Lacaria¹  Alessandra Pasut¹  Uxia Gurriaran Rodriguez¹  Michael A. Rudnicki¹  Hong Ming¹  Hang Yin¹ 

[1]Sprott Center for Stem Cell Research, Ottawa Hospital Research Institute, Ottawa, ON K1H8L6, Canada

关键词: Pax7;    Notch1;    NICD1;    satellite cells;    myogenic;    brown adipogenic;   

DOI  :  10.1016/j.celrep.2016.06.001

来源: DOAJ

【 摘 要 】

Pax7 is a nodal transcription factor that is essential for regulating the maintenance, expansion, and myogenic identity of satellite cells during both neonatal and adult myogenesis. Deletion of Pax7 results in loss of satellite cells and impaired muscle regeneration. Here, we show that ectopic expression of the constitutively active intracellular domain of Notch1 (NICD1) rescues the loss of Pax7-deficient satellite cells and restores their proliferative potential. Strikingly NICD1-expressing satellite cells do not undergo myogenic differentiation and instead acquire a brown adipogenic fate both in vivo and in vitro. NICD-expressing Pax7−/− satellite cells fail to upregulate MyoD and instead express the brown adipogenic marker PRDM16. Overall, these results show that Notch1 activation compensates for the loss of Pax7 in the quiescent state and acts as a molecular switch to promote brown adipogenesis in adult skeletal muscle.

【 授权许可】

Unknown