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Molecular and Cellular Biology, November 2004, p. 9295-9304, Vol. 24, No. 21
0270-7306/04/$08.00+0     DOI: 10.1128/MCB.24.21.9295-9304.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Conditional Activation of Akt in Adult Skeletal Muscle Induces Rapid Hypertrophy

Ka-Man V. Lai, Michael Gonzalez, William T. Poueymirou, William O. Kline, Erqian Na, Elizabeth Zlotchenko, Trevor N. Stitt, Aris N. Economides, George D. Yancopoulos, and David J. Glass*

Regeneron Pharmaceuticals, Inc., Tarrytown, New York

Received 14 June 2004/ Accepted 2 August 2004

Skeletal muscle atrophy is a severe morbidity caused by a variety of conditions, including cachexia, cancer, AIDS, prolonged bedrest, and diabetes. One strategy in the treatment of atrophy is to induce the pathways normally leading to skeletal muscle hypertrophy. The pathways that are sufficient to induce hypertrophy in skeletal muscle have been the subject of some controversy. We describe here the use of a novel method to produce a transgenic mouse in which a constitutively active form of Akt can be inducibly expressed in adult skeletal muscle and thereby demonstrate that acute activation of Akt is sufficient to induce rapid and significant skeletal muscle hypertrophy in vivo, accompanied by activation of the downstream Akt/p70S6 kinase protein synthesis pathway. Upon induction of Akt in skeletal muscle, there was also a significant decrease in adipose tissue. These findings suggest that pharmacologic approaches directed toward activating Akt will be useful in inducing skeletal muscle hypertrophy and that an increase in lean muscle mass is sufficient to decrease fat storage.

* Corresponding author. Mailing address: Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Rd., Tarrytown, NY 10591-6707. Phone: (914) 345-7527. Fax: (914) 345-7650. E-mail: david.glass{at}regeneron.com.

Molecular and Cellular Biology, November 2004, p. 9295-9304, Vol. 24, No. 21
0022-538X/04/$08.00+0     DOI: 10.1128/MCB.24.21.9295-9304.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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