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Increase in constitutively active MEK1 species by introduction of MEK1 mutations identified in cancers

Emiko Kinoshita-Kikuta1, Eiji Kinoshita1, Sayaka Ueda1

  • 1Department of Functional Molecular Science, Graduate School of Biomedical & Health Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima 734-8553, Japan.

Biochimica Et Biophysica Acta. Proteins and Proteomics
|May 13, 2018
PubMed

Insights

Mutations in the MEK1 gene can enhance its activity, leading to cancer. Phos-tag analysis reveals how these mutations cause resistance to MEK inhibitors, offering insights for targeted cancer therapy.

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • Mitogen-activated protein kinase (MAPK) cascades are crucial cellular signaling pathways.
  • The kinase MEK1 is a key component of these cascades, and its dysregulation through somatic mutations is implicated in various cancers.
  • Aberrant MEK1 activity makes it a significant therapeutic target for cancer treatment.

Purpose of the Study:

  • To investigate the functional consequences of MEK1 mutations found in sporadic cancers and drug-resistant cell lines.
  • To characterize the phosphorylation status and activity of MEK1 mutants using Phos-tag affinity electrophoresis.
  • To assess the impact of these mutations on MEK1 inhibitor resistance.

Main Methods:

  • Utilized Phos-tag affinity electrophoresis to analyze the phosphorylation status of MEK1.
  • Introduced specific MEK1 mutations associated with cancer and drug resistance.
  • Performed phosphorylation profiling of MEK1 mutants in the presence of RAF/MEK inhibitors.

Main Results:

  • Mutations in MEK1 led to constitutively active forms of the kinase, characterized by phosphorylation at Ser-218 and Ser-222 residues.
  • Several MEK1 mutations conferred resistance to multiple MEK inhibitors.
  • This resistance was associated with an increased abundance of active, phosphorylated MEK1 species.

Conclusions:

  • Phos-tag-based phosphorylation profiling is a valuable tool for understanding MEK1 mutation characteristics.
  • The findings provide clinical insights into MEK1-driven cancers and mechanisms of inhibitor resistance.
  • This approach can aid in the development of more effective targeted cancer therapies.
Keywords:
MEK1Phos-tag SDS-PAGEPhosphoproteomicsPhosphorylationSomatic mutationSporadic cancer

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