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MEN2A-RET-induced cellular transformation by activation of STAT3

J J Schuringa1, K Wojtachnio, W Hagens

  • 1Department of Developmental Genetics, University of Groningen, Kerklaan 30, 9751 NN, Haren, The Netherlands.

Oncogene
|September 6, 2001
PubMed

Insights

The MEN2A oncogene activates Signal Transducer and Activator of Transcription 3 (STAT3) through specific docking sites. This activation promotes malignant cell growth by enhancing proliferation and gene expression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cellular Signaling

Background:

  • The MEN2A oncogene encodes a constitutively active RET receptor tyrosine kinase.
  • RET signaling pathways are implicated in various cancers, including medullary thyroid carcinoma.

Purpose of the Study:

  • To investigate the mechanism by which MEN2A-RET activation leads to malignant cell growth.
  • To identify the role of Signal Transducer and Activator of Transcription 3 (STAT3) in MEN2A-RET-mediated oncogenesis.

Main Methods:

  • Utilized NIH3T3 cell lines stably expressing MEN2A-RET and STAT3 isoforms.
  • Assessed STAT3 phosphorylation at Tyr705 and Ser727.
  • Evaluated STAT3 transcriptional activity and its impact on cell proliferation and soft agar growth.

Main Results:

  • MEN2A-RET activates STAT3 through docking sites Tyr752 and Tyr928.
  • Both Tyr705 and Ser727 phosphorylation of STAT3 are induced by MEN2A-RET.
  • STAT3 serine phosphorylation is crucial for maximal STAT3 transcriptional activity.
  • NIH3T3 cells expressing MEN2A-RET and STAT3alpha exhibit enhanced proliferation, cyclin-D1 promoter activity, and soft agar colony formation.

Conclusions:

  • MEN2A-RET-induced malignant cell growth is mediated by the activation of STAT3.
  • Targeting the MEN2A-RET/STAT3 signaling axis may offer therapeutic strategies for MEN2A-associated cancers.

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