Abstract
MicroRNAs (miRNAs) have emerged as key regulators of skeletal myogenesis, but our knowledge of the identity of the myogenic miRNAs and their targets remains limited. In this study, we report the identification and characterization of a novel myogenic miRNA, miR-125b. We find that the levels of miR-125b decline during myogenesis and that miR-125b negatively modulates myoblast differentiation in culture and muscle regeneration in mice. Our results identify IGF-II (insulin-like growth factor 2), a critical regulator of skeletal myogenesis, as a direct and major target of miR-125b in both myocytes and regenerating muscles, revealing for the first time an miRNA mechanism controlling IGF-II expression. In addition, we provide evidence suggesting that miR-125b biogenesis is negatively controlled by kinase-independent mammalian target of rapamycin (mTOR) signaling both in vitro and in vivo as a part of a dual mechanism by which mTOR regulates the production of IGF-II, a master switch governing the initiation of skeletal myogenesis.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 69-81 |
| Number of pages | 13 |
| Journal | Journal of Cell Biology |
| Volume | 192 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 10 2011 |
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ASJC Scopus subject areas
- Cell Biology
Cite this
IGF-II is regulated by microRNA-125b in skeletal myogenesis. / Ge, Yejing; Sun, Yuting; Chen, Jie.
In: Journal of Cell Biology, Vol. 192, No. 1, 10.01.2011, p. 69-81.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - IGF-II is regulated by microRNA-125b in skeletal myogenesis
AU - Ge, Yejing
AU - Sun, Yuting
AU - Chen, Jie
PY - 2011/1/10
Y1 - 2011/1/10
N2 - MicroRNAs (miRNAs) have emerged as key regulators of skeletal myogenesis, but our knowledge of the identity of the myogenic miRNAs and their targets remains limited. In this study, we report the identification and characterization of a novel myogenic miRNA, miR-125b. We find that the levels of miR-125b decline during myogenesis and that miR-125b negatively modulates myoblast differentiation in culture and muscle regeneration in mice. Our results identify IGF-II (insulin-like growth factor 2), a critical regulator of skeletal myogenesis, as a direct and major target of miR-125b in both myocytes and regenerating muscles, revealing for the first time an miRNA mechanism controlling IGF-II expression. In addition, we provide evidence suggesting that miR-125b biogenesis is negatively controlled by kinase-independent mammalian target of rapamycin (mTOR) signaling both in vitro and in vivo as a part of a dual mechanism by which mTOR regulates the production of IGF-II, a master switch governing the initiation of skeletal myogenesis.
AB - MicroRNAs (miRNAs) have emerged as key regulators of skeletal myogenesis, but our knowledge of the identity of the myogenic miRNAs and their targets remains limited. In this study, we report the identification and characterization of a novel myogenic miRNA, miR-125b. We find that the levels of miR-125b decline during myogenesis and that miR-125b negatively modulates myoblast differentiation in culture and muscle regeneration in mice. Our results identify IGF-II (insulin-like growth factor 2), a critical regulator of skeletal myogenesis, as a direct and major target of miR-125b in both myocytes and regenerating muscles, revealing for the first time an miRNA mechanism controlling IGF-II expression. In addition, we provide evidence suggesting that miR-125b biogenesis is negatively controlled by kinase-independent mammalian target of rapamycin (mTOR) signaling both in vitro and in vivo as a part of a dual mechanism by which mTOR regulates the production of IGF-II, a master switch governing the initiation of skeletal myogenesis.
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U2 - 10.1083/jcb.201007165
DO - 10.1083/jcb.201007165
M3 - Article
C2 - 21200031
AN - SCOPUS:78651301788
VL - 192
SP - 69
EP - 81
JO - Journal of Cell Biology
JF - Journal of Cell Biology
SN - 0021-9525
IS - 1
ER -