Title |
Degradation of AMPK by a Cancer-Specific Ubiquitin Ligase
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Published in |
Cell, February 2015
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DOI | 10.1016/j.cell.2015.01.034 |
Pubmed ID | |
Authors |
Carlos T. Pineda, Saumya Ramanathan, Klementina Fon Tacer, Jenny L. Weon, Malia B. Potts, Yi-Hung Ou, Michael A. White, Patrick Ryan Potts |
Abstract |
AMP-activated protein kinase (AMPK) is a master sensor and regulator of cellular energy status. Upon metabolic stress, AMPK suppresses anabolic and promotes catabolic processes to regain energy homeostasis. Cancer cells can occasionally suppress the growth-restrictive AMPK pathway by mutation of an upstream regulatory kinase. Here, we describe a widespread mechanism to suppress AMPK through its ubiquitination and degradation by the cancer-specific MAGE-A3/6-TRIM28 ubiquitin ligase. MAGE-A3 and MAGE-A6 are highly similar proteins normally expressed only in the male germline but frequently re-activated in human cancers. MAGE-A3/6 are necessary for cancer cell viability and are sufficient to drive tumorigenic properties of non-cancerous cells. Screening for targets of MAGE-A3/6-TRIM28 revealed that it ubiquitinates and degrades AMPKα1. This leads to inhibition of autophagy, activation of mTOR signaling, and hypersensitization to AMPK agonists, such as metformin. These findings elucidate a germline mechanism commonly hijacked in cancer to suppress AMPK. |
X Demographics
Geographical breakdown
Country | Count | As % |
---|---|---|
Unknown | 2 | 100% |
Demographic breakdown
Type | Count | As % |
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Members of the public | 2 | 100% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
United States | 4 | 1% |
Canada | 2 | <1% |
United Kingdom | 1 | <1% |
Germany | 1 | <1% |
Japan | 1 | <1% |
Sweden | 1 | <1% |
Unknown | 313 | 97% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Ph. D. Student | 67 | 21% |
Researcher | 41 | 13% |
Student > Master | 33 | 10% |
Student > Bachelor | 32 | 10% |
Professor > Associate Professor | 19 | 6% |
Other | 56 | 17% |
Unknown | 75 | 23% |
Readers by discipline | Count | As % |
---|---|---|
Biochemistry, Genetics and Molecular Biology | 103 | 32% |
Agricultural and Biological Sciences | 74 | 23% |
Medicine and Dentistry | 36 | 11% |
Chemistry | 6 | 2% |
Immunology and Microbiology | 6 | 2% |
Other | 12 | 4% |
Unknown | 86 | 27% |