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Defining MAP3 kinases required for MDA-MB-231 cell tumor growth and metastasis

M R Cronan1, K Nakamura, N L Johnson

  • 1Department of Pharmacology, University of North Carolina School of Medicine, Chapel Hill, NC 27599-7365, USA.

Oncogene
|December 6, 2011
PubMed

Insights

Multiple MAP3 kinases (MAP3Ks) drive cancer growth and metastasis. Inhibiting MEKK2 and MLK3 significantly reduced tumor growth and spread in mice, revealing them as potential therapeutic targets.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Multiple MAP3 kinases (MAP3Ks) are implicated in cancer cell growth and metastasis.
  • MAP3Ks regulate key signaling pathways like ERK1/2, JNK, p38, and ERK5.

Purpose of the Study:

  • To screen the function of seven MAP3Ks in controlling tumor growth and metastasis using an MDA-MB-231 breast cancer xenograft model.
  • To identify novel MAP3K targets for cancer therapy.

Main Methods:

  • Utilized stable short hairpin RNA (shRNA) knockdown to inhibit the expression of seven selected MAP3Ks.
  • Established an orthotopic xenograft model using MDA-MB-231 cells known for their metastatic potential.

Main Results:

  • Knockdown of MEKK2 and MLK3 significantly inhibited both tumor growth and metastasis in vivo.
  • MEKK2 is crucial for epidermal growth factor receptor and Her2/Neu activation of ERK5, which is required for metastasis.
  • MLK3 loss increased mitotic infidelity and apoptosis in vitro, and MEKK2/MLK3 knockdown led to increased apoptosis in xenografts.

Conclusions:

  • MAP3Ks, specifically MEKK2 and MLK3, are essential for MDA-MB-231 tumor growth and metastasis.
  • MEKK2 and MLK3 represent promising, currently untargeted, therapeutic targets in cancer biology.

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