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AMPK promotes skeletal muscle autophagy through activation of forkhead FoxO3a and interaction with Ulk1
Abstract
In skeletal muscle, protein levels are determined by relative rates of protein synthesis and breakdown. The balance between synthesis and degradation of intracellular components determines the overall muscle fiber size. AMP‐activated protein kinase (AMPK), a sensor of cellular energy status, was recently shown to increase myofibrillar protein degradation through the expression of MAFbx and MuRF1. In the present study, the effect of AMPK activation by AICAR on autophagy was investigated in muscle cells. Our results show that FoxO3a transcription factor activation by AMPK induces the expression of the autophagy‐related proteins LC3B‐II, Gabarapl1, and Beclin1 in primary mouse skeletal muscle myotubes and in the Tibialis anterior (TA) muscle. Time course studies reveal that AMPK activation by AICAR leads to a transient nuclear relocalization of FoxO3a followed by an increase of its cytosolic level. Moreover, AMPK activation leads to the inhibition of mTORC1 and its subsequent dissociation of Ulk1, Atg13, and FIP200 complex. Interestingly, we identify Ulk1 as a new interacting partner of AMPK in muscle cells and we show that Ulk1 is associated with AMPK under normal conditions and dissociates from AMPK during autophagy process. Moreover, we find that AMPK phosphorylates FoxO3a and Ulk1. In conclusion, our data show that AMPK activation stimulates autophagy in skeletal muscle cells through its effects on the transcriptional function of FoxO3a and takes part in the initiation of autophagosome formation by interacting with Ulk1. Here, we present new evidences that AMPK plays a crucial role in the fine tuning of protein expression programs that control skeletal muscle mass. J. Cell. Biochem. 113: 695–710, 2012. © 2011 Wiley Periodicals, Inc.
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“Amino acids acutely activate AMPK, which sustains autophagy under nutrient sufficiency [667].”
From Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition) 1 (2021) · cites this paper as [667]
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Cited by
Sorted by citations
Guidelines for the use and interpretation of assays for monitoring autophagy (3rd edition).
Klionsky, D. J., Abdelmohsen, K., Abe, A., Abedin, M. J., Abeliovich, H., Acevedo Arozena, A., Adachi, H., Adams, C. M., Adams, P. D., Adeli, K., et al. (2016) · Autophagy · doi:10.1080/15548627.2015.1100356 · Cited by 5,894
Self-citationGuidelines for the use and interpretation of assays for monitoring autophagy
Klionsky, D. J., Abdalla, F. C., Abeliovich, H., Abraham, R. T., Acevedo-Arozena, A., Adeli, K., Agholme, L., Agnello, M., Agostinis, P., Aguirre-Ghiso, J. A., et al. (2012) · Autophagy · doi:10.4161/auto.19496 · Cited by 3,996
Self-citationGuidelines for the use and interpretation of assays for monitoring autophagy (4th edition) 1
Klionsky, D. J., Abdel-Aziz, A. K., Abdelfatah, S., Abdellatif, M., Abdoli, A., Abel, S., Abeliovich, H., Abildgaard, M. H., Abudu, Y. P., Acevedo-Arozena, A., et al. (2021) · Autophagy · doi:10.1080/15548627.2020.1797280 · Cited by 2,897
Mechanisms regulating skeletal muscle growth and atrophy
Schiaffino, S., Dyar, K. A., Ciciliot, S., Blaauw, B., & Sandri, M. (2013) · The FEBS Journal · doi:10.1111/febs.12253 · Cited by 1,492
Fyfe, J. J., Bishop, D. J., & Stepto, N. K. (2014) · Sports Medicine · doi:10.1007/s40279-014-0162-1 · Cited by 347
Metadata
- Authors
- Sanchez, A. M., Csibi, A., Raibon, A., Cornille, K., Gay, S., Bernardi, H., & Candau, R.
- Venue
- Journal of Cellular Biochemistry
- Publisher
- Wiley
- Published
- 2012-01-05
- Volume
- 113
- Issue
- 2
- Pages
- 695-710
- ISSN
- 0730-2312
- 1097-4644
- Cited by
- 306
- References
- 17
- Language
- en
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