Synthetic Essentiality of Metabolic Regulator PDHK1 in PTEN-Deficient Cells and Cancers

Cell Rep. 2019 Aug 27;28(9):2317-2330.e8. doi: 10.1016/j.celrep.2019.07.063.

Abstract

Phosphatase and tensin homolog deleted on chromosome 10 (PTEN) is a tumor suppressor and bi-functional lipid and protein phosphatase. We report that the metabolic regulator pyruvate dehydrogenase kinase1 (PDHK1) is a synthetic-essential gene in PTEN-deficient cancer and normal cells. The PTEN protein phosphatase dephosphorylates nuclear factor κB (NF-κB)-activating protein (NKAP) and limits NFκB activation to suppress expression of PDHK1, a NF-κB target gene. Loss of the PTEN protein phosphatase upregulates PDHK1 to induce aerobic glycolysis and PDHK1 cellular dependence. PTEN-deficient human tumors harbor increased PDHK1, a biomarker of decreased patient survival. This study uncovers a PTEN-regulated signaling pathway and reveals PDHK1 as a potential target in PTEN-deficient cancers.

Keywords: NF-κB; NKAP; PDHK1; PTEN; cancer; metabolism; protein phosphatase; signaling; synthetic lethality.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Line, Tumor
  • Female
  • Glycolysis
  • HEK293 Cells
  • Humans
  • Male
  • Mice
  • Mice, Inbred NOD
  • Mice, SCID
  • NF-kappa B / metabolism
  • Neoplasms / genetics
  • Neoplasms / metabolism*
  • Neoplasms / pathology
  • PTEN Phosphohydrolase / economics
  • PTEN Phosphohydrolase / genetics*
  • PTEN Phosphohydrolase / metabolism
  • Pyruvate Dehydrogenase Acetyl-Transferring Kinase / genetics*
  • Pyruvate Dehydrogenase Acetyl-Transferring Kinase / metabolism
  • Repressor Proteins / metabolism

Substances

  • NF-kappa B
  • NKAP protein, human
  • PDK1 protein, human
  • Pyruvate Dehydrogenase Acetyl-Transferring Kinase
  • Repressor Proteins
  • PTEN Phosphohydrolase