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Mutational activation of the MAP3K8 protooncogene in lung cancer

Adam Michael Clark1, Steven H Reynolds, Marshall Anderson

  • 1Laboratory of Cellular Carcinogenesis and Tumor Promotion, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA.

Genes, Chromosomes & Cancer
|August 3, 2004
PubMed

Insights

The MAP3K8 protooncogene was identified as a transforming gene in human lung cancer. While a specific mutation enhanced cellular transformation, activating MAP3K8 mutations appear rare in lung tumorigenesis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Signal Transduction

Background:

  • The MAP3K8 protooncogene, also known as Cot/Tpl-2, is involved in crucial cellular signaling pathways including MAP kinase, SAP kinase, and NF-kappaB.
  • While MAP3K8 mutations are known in rats, activating mutations have not been previously identified in human tumors.
  • Understanding the role of MAP3K8 in human cancer is essential for developing targeted therapies.

Purpose of the Study:

  • To identify and characterize MAP3K8 as a transforming gene in human lung adenocarcinoma.
  • To investigate the presence and frequency of MAP3K8 mutations in lung tumorigenesis.
  • To assess the transforming activity of wild-type and mutant MAP3K8.

Main Methods:

  • Identification of MAP3K8 using NIH3T3 nude mouse tumorigenicity assay and cDNA library screening.
  • Mutation analysis employing polymerase chain reaction (PCR), single-strand conformational polymorphism (SSCP), and 3'RACE.
  • Functional assessment of wild-type and mutant MAP3K8 cDNA in NIH3T3 cell transformation assays.

Main Results:

  • A 3' end mutation in MAP3K8 exon 8 was identified in a human lung adenocarcinoma and confirmed in the primary tumor.
  • Both wild-type and mutant MAP3K8 cDNAs demonstrated transforming activity in NIH3T3 cells, with the mutant exhibiting significantly greater activity.
  • Screening of lung cancer cell lines revealed only one silent polymorphism, suggesting activating MAP3K8 mutations are infrequent.

Conclusions:

  • MAP3K8 plays a role in cellular transformation, as evidenced by its transforming activity.
  • Activating mutations in MAP3K8 appear to be a rare event in the development of human lung cancer.
  • Further research may explore non-mutational mechanisms of MAP3K8 activation in lung tumorigenesis.

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