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In Vitro Evaluation of Oncogenic Transformation in Human Mammary Epithelial Cells
09:44

In Vitro Evaluation of Oncogenic Transformation in Human Mammary Epithelial Cells

Published on: September 24, 2020

The MCT-1 oncogene product impairs cell cycle checkpoint control and transforms human mammary epithelial cells

Hsin-Ling Hsu1, Bo Shi, Ronald B Gartenhaus

  • 1Division of Hematology/Oncology, Department of Medicine, Northwestern University Feinberg School of Medicine and the Robert H Lurie Comprehensive Cancer Center of Northwestern University, Chicago, IL 60611, USA.

Oncogene
|May 18, 2005
PubMed

Insights

Multiple copies in T-cell malignancy (MCT-1) oncogene drives cell transformation and genomic instability. It deregulates cell cycle checkpoints and DNA damage response, promoting cancer development.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Multiple copies in T-cell malignancy (MCT-1) is a putative oncogene identified in T-cell lymphoma.
  • MCT-1 overexpression induces cell transformation, proliferation, and activates PI-3K/AKT survival pathways.
  • MCT-1 protein stabilizes in response to DNA damage, but its role in DNA damage response is unknown.

Purpose of the Study:

  • To investigate the impact of MCT-1 overexpression on DNA damage response and cell cycle regulation.
  • To determine MCT-1's role in malignant transformation and genomic instability.

Main Methods:

  • Overexpression and knockdown (siRNA) of MCT-1 in human cell lines.
  • Analysis of DNA damage markers (gamma-H2AX, NBS1, 53BP1 foci).
  • Cell cycle analysis (flow cytometry) after gamma-irradiation.
  • Transformation assays in immortalized human mammary epithelial cells.

Main Results:

  • MCT-1 overexpression deregulates cell cycle checkpoints, enhancing H2AX and NBS1 phosphorylation.
  • MCT-1 increases DNA damage-induced foci (gamma-H2AX, 53BP1) and S-phase population post-irradiation.
  • MCT-1 knockdown attenuates H2AX phosphorylation and G1/S checkpoint defects.
  • MCT-1 transforms human mammary epithelial cells and promotes genomic instability.

Conclusions:

  • MCT-1 plays a critical role in deregulating the DNA damage response and cell cycle checkpoints.
  • MCT-1 contributes to malignant transformation and genomic instability.
  • Targeting MCT-1 may offer therapeutic strategies for T-cell malignancies and other cancers.

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