Calcineurin differentially regulates fast myosin heavy chain genes in oxidative muscle fibre type conversion.

Calcineurin differentially regulates fast myosin heavy chain genes in oxidative muscle fibre type conversion. Research Abstract Details 

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Calcineurin differentially regulates fast myosin heavy chain genes in oxidative muscle fibre type conversion. Abstract Text:

Nuno da Costa,Julia Edgar,Peck-Toung Ooi,Yuhong Su,Joachim D Meissner,Kin-Chow Chang,

In skeletal muscle, calcineurin is crucial for myocyte differentiation and in the determination of the slow oxidative fibre phenotype, both processes being important determinants of muscle performance, metabolic health and meat-animal production. Fibre type is defined by the isoform identity of the skeletal myosin heavy chain (MyHC). We have examined the responses of the major MyHC genes to calcineurin signalling during fibre formation of muscle C2C12 cells. We have found that calcineurin acts as a signal to up-regulate the fast-oxidative MyHC2a gene and to down-regulate the faster MyHC2x and MyHC2b genes in a manner that appears to be NFAT-independent. Contrary to expectation, the up-regulation of MyHCslow by calcineurin seems to be time-dependent and is only detectable once the initial differential expression of the post-natal fast MyHC genes has been established. The simultaneous elevated expression of MyHC2a and the repression of MyHC2x and MyHC2b expression indicate that both processes (elevation and repression) are actively coordinated during oxidative fibre conversion. We have further determined that muscle LIM protein (MLP), a calcineurin-binding Z-line co-factor, is induced by calcineurin and that its co-expression with calcineurin has an additive effect on MyHCslow expression. Hence, post-natal fast MyHCs are important early effector targets of calcineurin, whereas MyHCslow up-regulation is mediated in part by calcineurin-induced MLP.

Calcineurin differentially regulates fast myosin heavy chain genes in oxidative muscle fibre type conversion. Publishing Authors By Initials

N da Costa,J Edgar,PT Ooi,Y Su,JD Meissner,KC Chang,

For similar proteins: protein isoforms research abstracts see: proteins: protein isoforms research

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Calcineurin differentially regulates fast myosin heavy chain genes in oxidative muscle fibre type conversion. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Cell and tissue research

VOLUME: 329

Page Numbers: 515-27

Journal Abbreviation: Cell Tissue Res.

ISSN: 0302-766X

DAY: 22

MONTH: 06

YEAR: 2007

Calcineurin differentially regulates fast myosin heavy chain genes in oxidative muscle fibre type conversion. Information

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LANGUAGE: eng

NlmUniqueID: 417625

Calcineurin differentially regulates fast myosin heavy chain genes in oxidative muscle fibre type conversion. Keywords Mesh Terms:

KEYWORDS: Protein Isoforms

MESH TERMS: metabolism

Chemical & Substance for Abstract: Calcineurin differentially regulates fast myosin heavy chain genes in oxidative muscle fibre type conversion. Information

Substance Name: Calcineurin

Registry Number: EC 3.1.3.-

Grant and Affiliation Information for Calcineurin differentially regulates fast myosin heavy chain genes in oxidative muscle fibre type conversion.

AFFILIATION: Molecular Medicine Laboratory, Institute of Comparative Medicine, University of Glasgow Veterinary School, Glasgow, UK.

Country: Germany

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MEDLINETA: Cell Tissue Res

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