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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
PubMed

Insights

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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