Document Type
Article
Publication Date
7-1-2017
Abstract
Autophagy activated after DNA damage or other stresses mitigates cellular damage by removing damaged proteins, lipids, and organelles. Activation of the master metabolic kinase AMPK enhances autophagy. Here we report that cyclin D1 restrains autophagy by modulating the activation of AMPK. In cell models of human breast cancer or in a cyclin D1-deficient model, we observed a cyclin D1-mediated reduction in AMPK activation. Mechanistic investigations showed that cyclin D1 inhibited mitochondrial function, promoted glycolysis, and reduced activation of AMPK (pT172), possibly through a mechanism that involves cyclin D1-Cdk4/Cdk6 phosphorylation of LKB1. Our findings suggest how AMPK activation by cyclin D1 may couple cell proliferation to energy homeostasis.
Recommended Citation
Casimiro, Mathew C.; Disante, Gabriele; Di Rocco, Agnese; Loro, Emanuele; Pupo, Claudia; Pestell, Timothy G.; Bisetto, Sara; Velasco-Velázquez, Marco A.; Jiao, Xuanmao; Li, Zhiping; Kusminski, Christine M.; Seifert, Erin L.; Wang, Chenguang; Ly, Daniel; Zheng, Bin; Shen, Che-Hung; Scherer, Philipp E.; and Pestell, Richard, "Cyclin D1 Restrains Oncogene-Induced Autophagy by Regulating the AMPK-LKB1 Signaling Axis." (2017). Department of Cancer Biology Faculty Papers. Paper 137.
https://jdc.jefferson.edu/cbfp/137
PubMed ID
28522753
Language
English
Comments
This article has been peer reviewed. It is the authors' final version prior to publication in Cancer Research, Volume 77, Issue 13, July 2017, Pages 3391-3405.
The published version is available at https://doi.org/10.1158/0008-5472.CAN-16-0425. Copyright © AACR