The NF-?B transcription factor is part of a signaling pathway involved in the regulation of cell growth, differentiation and cellular survival. NF-?B activity is often found deregulated in diseases associated with chronic inflammation. Accumulating evidence suggest that NF-?B also functions in skeletal muscle disorders, and its involvement and mechanisms of action in several of these disorders are now beginning to defined. Our approach to furthering our insight in how NF-?B participates in muscle disease is to ascertain on a more basic level how this signaling pathway functions in regulating skeletal muscle differentiation. Results revealed that NF-?B participates in myogenesis through two signaling pathways, referred to as the classical and alternative. Whereas the classical is constitutively active in proliferating myoblasts and inhibits differentiation through multiple mechanisms, alternative signaling is induced during myogenesis, and functions not in myotube formation, but rather in promoting mitochondrial biogenesis and maintaining myotube homeostasis. The goal of this current application is to perform a more in depth analysis of the alternative pathway by elucidating the mechanism and relevance in regulating mitochondrial biogenesis and oxidative metabolism in differentiating muscle cells. Towards this goal we seek to perform the following three specific aims: 1) Determine the molecular mechanism by which alternative signaling regulates mitochondrial biogenesis in differentiating muscle cells;2) Determine whether regulation of mitochondrial biogenesis by alternative NF-?B signaling is relevant in vivo;and 3) Elucidate the mechanism by which the alternative pathway becomes activated during myogenesis. Since mitochondrial dysfunction is often associated with muscle disorders, broadening our understanding of alternative NF-?B signaling in myogenesis may shed additional insight in how NF-?B participates in skeletal muscle disease.

Public Health Relevance

NF-?B/IKK signaling functions by two pathways that regulate skeletal muscle differentiation. The alternative signaling pathway appears to function in differentiating cells to regulate mitochondrial biogenesis and oxidative respiration. This proposal will examine in greater detail the molecular mechanism and in vivo significance of NF-?B/IKK alternative signaling in regulating mitochondrial biogenesis as well as the mechanism by which this pathway is activated during skeletal muscle differentiation.

Agency
National Institute of Health (NIH)
Institute
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Type
Research Project (R01)
Project #
2R01AR052787-07A1
Application #
8321289
Study Section
Special Emphasis Panel (ZRG1-MOSS-C (90))
Program Officer
Nuckolls, Glen H
Project Start
2005-09-01
Project End
2017-03-31
Budget Start
2012-04-01
Budget End
2013-03-31
Support Year
7
Fiscal Year
2012
Total Cost
$343,125
Indirect Cost
$118,125
Name
Ohio State University
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
832127323
City
Columbus
State
OH
Country
United States
Zip Code
43210
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Gu, Jin-Mo; Wang, David J; Peterson, Jennifer M et al. (2016) An NF-?B--EphrinA5-Dependent Communication between NG2(+) Interstitial Cells and Myoblasts Promotes Muscle Growth in Neonates. Dev Cell 36:215-24
Londhe, Priya; Guttridge, Denis C (2015) Inflammation induced loss of skeletal muscle. Bone 80:131-142
Remels, A H V; Gosker, H R; Bakker, J et al. (2013) Regulation of skeletal muscle oxidative phenotype by classical NF-?B signalling. Biochim Biophys Acta 1832:1313-25
Shintaku, Jonathan; Guttridge, Denis C (2013) Reining in nuclear factor-kappaB in skeletal muscle disorders. Curr Opin Clin Nutr Metab Care 16:251-7
Bakkar, Nadine; Ladner, Katherine; Canan, Benjamin D et al. (2012) IKK? and alternative NF-?B regulate PGC-1? to promote oxidative muscle metabolism. J Cell Biol 196:497-511
Peterson, Jennifer M; Bakkar, Nadine; Guttridge, Denis C (2011) NF-ýýB signaling in skeletal muscle health and disease. Curr Top Dev Biol 96:85-119
Dahlman, Jason M; Bakkar, Nadine; He, Wei et al. (2010) NF-kappaB functions in stromal fibroblasts to regulate early postnatal muscle development. J Biol Chem 285:5479-87
Bakkar, Nadine; Guttridge, Denis C (2010) NF-kappaB signaling: a tale of two pathways in skeletal myogenesis. Physiol Rev 90:495-511
Wang, Huating; Garzon, Ramiro; Sun, Hao et al. (2008) NF-kappaB-YY1-miR-29 regulatory circuitry in skeletal myogenesis and rhabdomyosarcoma. Cancer Cell 14:369-81

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