EphA7 promotes myogenic differentiation via cell-cell contact

eLife

Amory Carter¹  Danny A Stark¹  Jacqueline Ihnat¹  Rebecca N Craigg¹  Sammy Zino¹  Laura L Arnold¹  DDW Cornelison²  Alessandra Cecchini² 

[1] Division of Biological Sciences, University of Missouri, Columbia, United States;Division of Biological Sciences, University of Missouri, Columbia, United States;Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, United States;

关键词: myogenesis;    Eph/ephrin;    community effect;    Mouse;   

DOI  :  10.7554/eLife.53689

来源: publisher

【 摘 要 】

The conversion of proliferating skeletal muscle precursors (myoblasts) to terminally-differentiated myocytes is a critical step in skeletal muscle development and repair. We show that EphA7, a juxtacrine signaling receptor, is expressed on myocytes during embryonic and fetal myogenesis and on nascent myofibers during muscle regeneration in vivo. In EphA7-/- mice, hindlimb muscles possess fewer myofibers at birth, and those myofibers are reduced in size and have fewer myonuclei and reduced overall numbers of precursor cells throughout postnatal life. Adult EphA7-/- mice have reduced numbers of satellite cells and exhibit delayed and protracted muscle regeneration, and satellite cell-derived myogenic cells from EphA7-/- mice are delayed in their expression of differentiation markers in vitro. Exogenous EphA7 extracellular domain will rescue the null phenotype in vitro, and will also enhance commitment to differentiation in WT cells. We propose a model in which EphA7 expression on differentiated myocytes promotes commitment of adjacent myoblasts to terminal differentiation.

【 授权许可】

CC BY