Active GSK3 beta and an intact beta-catenin TCF complex are essential for the differentiation of human myogenic progenitor cells

作者：Agley C C^*; Lewis F C; Jaka O; Lazarus N R; Velloso C; Francis West P; Ellison Hughes G M; Harridge S D R

来源：Scientific Reports, 2017, 7(1): 13189.

DOI：10.1038/s41598-017-10731-1

Wnt-beta-catenin signalling is essential for skeletal muscle myogenesis during development, but its role in adult human skeletal muscle remains unknown. Here we have used human primary CD56(Pos) satellite cell-derived myogenic progenitors obtained from healthy individuals to study the role of Wnt-beta-catenin signalling in myogenic differentiation. We show that dephosphorylated beta-catenin (active-beta-catenin), the central effector of the canonical Wnt cascade, is strongly upregulated at the onset of differentiation and undergoes nuclear translocation as differentiation progresses. To establish the role of Wnt signalling in regulating the differentiation process we manipulated key nodes of this pathway through a series of beta-catenin gain-of-GSK3 inhibition and beta-catenin overexpression) or loss-of-function experiments (dominant negative TCF4). Our data showed that manipulation of these critical pathway components led to varying degrees of disruption to the normal differentiation phenotype indicating the importance of Wnt signalling in regulating this process. We reveal an independent necessity for active-beta-catenin in the fusion and differentiation of human myogenic progenitors and that dominant negative inhibition of TCF4 prevents differentiation completely. Together these data add new mechanistic insights into both Wnt signalling and adult human myogenic progenitor differentiation.

• 出版日期2017-10-13