O-GlcNAcylation Regulates Cancer Metabolism and Survival Stress Signaling Via Regulation of the HIF-1 Pathway

Overview

Journal Mol Cell

Publisher Cell Press

Specialty Cell Biology

Date 2014 May 27

PMID 24857547

Citations 209

Authors

Christina M Ferrer

Thomas P Lynch

Valerie L Sodi

John N Falcone

Luciana P Schwab

Danielle L Peacock

David J Vocadlo

Tiffany N Seagroves

Mauricio J Reginato

Affiliations

Soon will be listed here.

Abstract

The hexosamine biosynthetic pathway elevates posttranslational addition of O-linked β-N-acetylglucosamine (O-GlcNAc) on intracellular proteins. Cancer cells elevate total O-GlcNAcylation by increasing O-GlcNAc transferase (OGT) and/or decreasing O-GlcNAcase (OGA) levels. Reducing O-GlcNAcylation inhibits oncogenesis. Here, we demonstrate that O-GlcNAcylation regulates glycolysis in cancer cells via hypoxia-inducible factor 1 (HIF-1α) and its transcriptional target GLUT1. Reducing O-GlcNAcylation increases α-ketoglutarate, HIF-1 hydroxylation, and interaction with von Hippel-Lindau protein (pVHL), resulting in HIF-1α degradation. Reducing O-GlcNAcylation in cancer cells results in activation of endoplasmic reticulum (ER) stress and cancer cell apoptosis mediated through C/EBP homologous protein (CHOP). HIF-1α and GLUT1 are critical for OGT-mediated regulation of metabolic stress, as overexpression of stable HIF-1 or GLUT1 rescues metabolic defects. Human breast cancers with high levels of HIF-1α contain elevated OGT, and lower OGA levels correlate independently with poor patient outcome. Thus, O-GlcNAcylation regulates cancer cell metabolic reprograming and survival stress signaling via regulation of HIF-1α.

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