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MCT-1 expression and PTEN deficiency synergistically promote neoplastic multinucleation through the Src/p190B

M-H Wu1, Y-A Chen1, H-H Chen1

  • 1Institute of Molecular and Genomic Medicine, National Health Research Institutes, Taiwan, ROC.

Oncogene
|May 27, 2014
PubMed

Insights

Increased oncogene MCT-1 expression promotes cancer multinucleation by inhibiting PTEN and activating Src/p190B signaling. Targeting MCT-1 suppresses tumor growth in PTEN-deficient breast cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Multinucleation is a hallmark of malignant neoplasms, but its underlying molecular mechanisms are not fully understood.
  • Loss or mutation of the tumor suppressor PTEN is linked to malignant tumor development.
  • The oncogene MCT-1 (multiple copies in T-cell malignancy 1) role in PTEN-deficient cancers requires elucidation.

Purpose of the Study:

  • To investigate the molecular mechanism by which MCT-1 contributes to neoplastic multinucleation in PTEN-deficient cells.
  • To explore the interplay between MCT-1, PTEN, Src, p190B, and RhoA signaling in cancer progression.
  • To evaluate the therapeutic potential of targeting MCT-1 in PTEN-null breast cancer.

Main Methods:

  • Investigated the interaction of MCT-1 with PTEN, p190B, and Src in PTEN-null cancer cells.
  • Utilized short hairpin RNA (shRNA) to target MCT-1 expression.
  • Assessed effects on phosphoinositide 3 kinase/AKT signaling, cell survival, mitotic catastrophe, and xenograft tumorigenicity.
  • Analyzed clinical breast cancer samples for correlations between MCT-1, p190B, and PTEN expression.

Main Results:

  • MCT-1 overexpression antagonizes PTEN activity, promoting survival and malignancy in PTEN-deficient cells.
  • MCT-1 interacts with p190B and Src, synergistically inhibiting RhoA activity and leading to multinucleation via mitotic errors.
  • MCT-1 knockdown suppressed Src/p190B signaling, improved nuclear structure, and reduced tumor growth in vivo.
  • Clinical data confirmed MCT-1/p190B promotion and PTEN suppression in human breast cancer.

Conclusions:

  • MCT-1 drives neoplastic multinucleation in PTEN-deficient cancers through the Src/p190B/RhoA pathway.
  • MCT-1 is a potential biomarker for breast tumor development.
  • Targeting MCT-1 represents a promising therapeutic strategy for breast cancers with Src hyperactivation and/or PTEN dysfunction.

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