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UCP2 Deficiency Increases Colon Tumorigenesis by Promoting Lipid Synthesis and Depleting NADPH for Antioxidant Defenses.

Cell reports (2019-08-29)
Esther Aguilar, Pauline Esteves, Tiphaine Sancerni, Véronique Lenoir, Thomas Aparicio, Frédéric Bouillaud, Renaud Dentin, Carina Prip-Buus, Daniel Ricquier, Claire Pecqueur, Sandra Guilmeau, Marie-Clotilde Alves-Guerra
ABSTRACT

Colorectal cancer (CRC) is associated with metabolic and redox perturbation. The mitochondrial transporter uncoupling protein 2 (UCP2) controls cell proliferation in vitro through the modulation of cellular metabolism, but the underlying mechanism in tumors in vivo remains unexplored. Using murine intestinal cancer models and CRC patient samples, we find higher UCP2 protein levels in tumors compared to their non-tumoral counterparts. We reveal the tumor-suppressive role of UCP2 as its deletion enhances colon and small intestinal tumorigenesis in AOM/DSS-treated and ApcMin/+ mice, respectively, and correlates with poor survival in the latter model. Mechanistically, UCP2 loss increases levels of oxidized glutathione and proteins in tumors. UCP2 deficiency alters glycolytic pathways while promoting phospholipid synthesis, thereby limiting the availability of NADPH for buffering oxidative stress. We show that UCP2 loss renders colon cells more prone to malignant transformation through metabolic reprogramming and perturbation of redox homeostasis and could favor worse outcomes in CRC.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Azoxymethane, 13.4 M, ≥98%
Sigma-Aldrich
Monoclonal Anti-β-Actin antibody produced in mouse, clone AC-74, ascites fluid
Sigma-Aldrich
OxyBlot Protein Oxidation Detection Kit, The OxyBlot Protein Oxidation Detection Kit provides the reagents to perform the immunoblot detection of carbonyl groups introduced into proteins by oxidative reactions with ozone or oxides of nitrogen or by metal catalyzed oxidation.