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Cell Rep. 2015 Mar 3;10(8):1335-48. doi: 10.1016/j.celrep.2015.02.006. Epub 2015 Feb 26.

Metabolic reprogramming of cancer-associated fibroblasts by IDH3α downregulation.

Author information

1
Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, 280 South Chongqing Road, Shanghai 200025, China; Institute of Cancer Stem Cell, Dalian Medical University, 9 South Lvshun Road, Dalian, Liaoning 116044, China.
2
Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, 280 South Chongqing Road, Shanghai 200025, China.
3
Markey Cancer Center, University of Kentucky, College of Medicine, 800 Rose Street, Lexington, KY 40536, USA.
4
School of Life Sciences, Fudan University, 220 Handan Road, Shanghai 200433, China.
5
Markey Cancer Center, University of Kentucky, College of Medicine, 800 Rose Street, Lexington, KY 40536, USA. Electronic address: peter.zhou@uky.edu.
6
Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, 280 South Chongqing Road, Shanghai 200025, China. Electronic address: jmei@sjtu.edu.cn.

Abstract

Cancer-associated fibroblasts (CAFs) provide critical metabolites for tumor growth and undergo metabolic reprogramming to support glycolysis. However, the molecular mechanisms responsible for this change remain unclear. Here, we report that TGF-β1- or PDGF-induced CAFs switch from oxidative phosphorylation to aerobic glycolysis. We identify downregulation of isocitrate dehydrogenase 3α (IDH3α) as a marker for this switch. Furthermore, miR-424 downregulates IDH3α during CAF formation. Downregulation of IDH3α decreases the effective level of α-ketoglutarate (α-KG) by reducing the ratio of α-KG to fumarate and succinate, resulting in PHD2 inhibition and HIF-1α protein stabilization. The accumulation of HIF-1α, in turn, promotes glycolysis by increasing the uptake of glucose, upregulating expression of glycolytic enzymes under normoxic conditions, and inhibiting oxidative phosphorylation by upregulating NDUFA4L2. CAFs from tumor samples exhibit low levels of IDH3α, and overexpression of IDH3α prevents transformation of fibroblasts into CAFs. Our studies reveal IDH3α to be a critical metabolic switch in CAFs.

PMID:
25732824
DOI:
10.1016/j.celrep.2015.02.006
[Indexed for MEDLINE]
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