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Cyclin D1 Restrains Oncogene-Induced Autophagy by Regulating the AMPK-LKB1 Signaling Axis
Mathew C Casimiro1,2, Gabriele Di Sante1,2, Agnese Di Rocco1,2
1Pennsylvania Cancer and Regenerative Medicine Research Center (PCARM), Doylestown, Pennsylvania.
Cancer Research
|May 20, 2017
Summary
Cyclin D1 hinders autophagy, a cellular repair process, by reducing AMP-activated protein kinase (AMPK) activation. This finding reveals a link between cell growth and energy balance in cancer.
Area of Science:
- Cellular biology
- Cancer research
- Metabolism
Background:
- Autophagy removes damaged cellular components, mitigating stress and damage.
- AMP-activated protein kinase (AMPK) activation enhances autophagy.
- Cyclin D1 is implicated in cell proliferation and cancer progression.
Purpose of the Study:
- To investigate the role of cyclin D1 in regulating autophagy.
- To elucidate the mechanism by which cyclin D1 affects AMPK activation.
- To understand how cyclin D1 influences the coupling of cell proliferation and energy homeostasis.
Main Methods:
- Utilized cell models of human breast cancer.
- Employed a cyclin D1-deficient model.
- Performed mechanistic investigations into cyclin D1's effects on mitochondrial function, glycolysis, and AMPK activation (pT172).
Main Results:
- Observed a cyclin D1-mediated reduction in AMPK activation in cancer cell models.
- Demonstrated that cyclin D1 inhibits mitochondrial function and promotes glycolysis.
- Identified a potential mechanism involving cyclin D1-Cdk4/Cdk6 phosphorylation of LKB1.
Conclusions:
- Cyclin D1 restrains autophagy by modulating AMPK activation.
- Cyclin D1's effects on cellular metabolism and AMPK may link cell proliferation to energy homeostasis.
- Findings provide insights into the interplay between cell cycle regulators and metabolic pathways in cancer.
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