Differential Effector Engagement by Oncogenic KRAS

Cell Rep. 2018 Feb 13;22(7):1889-1902. doi: 10.1016/j.celrep.2018.01.051.

Abstract

KRAS can bind numerous effector proteins, which activate different downstream signaling events. The best known are RAF, phosphatidylinositide (PI)-3' kinase, and RalGDS families, but many additional direct and indirect effectors have been reported. We have assessed how these effectors contribute to several major phenotypes in a quantitative way, using an arrayed combinatorial siRNA screen in which we knocked down 41 KRAS effectors nodes in 92 cell lines. We show that every cell line has a unique combination of effector dependencies, but in spite of this heterogeneity, we were able to identify two major subtypes of KRAS mutant cancers of the lung, pancreas, and large intestine, which reflect different KRAS effector engagement and opportunities for therapeutic intervention.

Keywords: KRAS; RNAi screen; RSK; paralogs; redundancy.

Publication types

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

MeSH terms

  • AMP-Activated Protein Kinase Kinases
  • Adenylate Kinase / metabolism
  • Cell Line, Tumor
  • Drug Evaluation, Preclinical
  • Gene Expression Regulation, Neoplastic / drug effects
  • Humans
  • Metabolic Networks and Pathways / drug effects
  • Models, Biological
  • Mutation / genetics
  • Oncogenes*
  • Protein Serine-Threonine Kinases / metabolism
  • Proto-Oncogene Proteins p21(ras) / genetics
  • Proto-Oncogene Proteins p21(ras) / metabolism*
  • RNA Interference
  • RNA, Small Interfering / metabolism
  • Small Molecule Libraries / pharmacology

Substances

  • KRAS protein, human
  • RNA, Small Interfering
  • Small Molecule Libraries
  • Protein Serine-Threonine Kinases
  • STK11 protein, human
  • AMP-Activated Protein Kinase Kinases
  • Adenylate Kinase
  • Proto-Oncogene Proteins p21(ras)