MicroRNA‐29a in Adult Muscle Stem Cells Controls Skeletal Muscle Regeneration During Injury and Exercise Downstream of Fibroblast Growth Factor‐2

The expansion of myogenic progenitors (MPs) in the adult muscle stem cell niche is critical for the regeneration of skeletal muscle. Activation of quiescent MPs depends on the dismantling of the basement membrane and increased access to growth factors such as fibroblast growth factor‐2 (FGF2). Here,...

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Published in:Stem cells (Dayton, Ohio) Ohio), 2016-03, Vol.34 (3), p.768-780
Main Authors: Galimov, Artur, Merry, Troy L., Luca, Edlira, Rushing, Elisabeth J., Mizbani, Amir, Turcekova, Katarina, Hartung, Angelika, Croce, Carlo M., Ristow, Michael, Krützfeldt, Jan
Format: Article
Language:English
Subjects:
Animals
Basement membrane
Cell Differentiation - genetics
Exercise
FGF2
Fibroblast Growth Factor 2 - biosynthesis
Fibroblast Growth Factor 2 - genetics
Fibroblasts
Gene Expression Regulation, Developmental - genetics
Gene Knockout Techniques
Growth factors
Humans
Mice
MicroRNA
MicroRNAs
MicroRNAs - genetics
Muscle Development - genetics
Muscle, Skeletal - cytology
Muscle, Skeletal - growth & development
Musculoskeletal system
Regeneration
Rodents
Skeletal muscle
Stem cells
Wound Healing - genetics
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Summary:The expansion of myogenic progenitors (MPs) in the adult muscle stem cell niche is critical for the regeneration of skeletal muscle. Activation of quiescent MPs depends on the dismantling of the basement membrane and increased access to growth factors such as fibroblast growth factor‐2 (FGF2). Here, we demonstrate using microRNA (miRNA) profiling in mouse and human myoblasts that the capacity of FGF2 to stimulate myoblast proliferation is mediated by miR‐29a. FGF2 induces miR‐29a expression and inhibition of miR‐29a using pharmacological or genetic deletion decreases myoblast proliferation. Next generation RNA sequencing from miR‐29a knockout myoblasts (Pax7CE/+; miR‐29aflox/flox) identified members of the basement membrane as the most abundant miR‐29a targets. Using gain‐ and loss‐of‐function experiments, we confirm that miR‐29a coordinately regulates Fbn1, Lamc1, Nid2, Col4a1, Hspg2 and Sparc in myoblasts in vitro and in MPs in vivo. Induction of FGF2 and miR‐29a and downregulation of its target genes precedes muscle regeneration during cardiotoxin (CTX)‐induced muscle injury. Importantly, MP‐specific tamoxifen‐induced deletion of miR‐29a in adult skeletal muscle decreased the proliferation and formation of newly formed myofibers during both CTX‐induced muscle injury and after a single bout of eccentric exercise. Our results identify a novel miRNA‐based checkpoint of the basement membrane in the adult muscle stem cell niche. Strategies targeting miR‐29a might provide useful clinical approaches to maintain muscle mass in disease states such as ageing that involve aberrant FGF2 signaling. Stem Cells 2016;34:768–780
ISSN:1066-5099
1549-4918
DOI:10.1002/stem.2281