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Egr-1 suppresses breast cancer cells proliferation by arresting cell cycle progression via down-regulating CyclinDs

Lu-Lu Wei1, Xiao-Jin Wu2, Chan-Chan Gong1

  • 1Department of Pathology, Xuzhou Medical University Xuzhou 221004, China.

International Journal of Clinical and Experimental Pathology
|January 23, 2020
PubMed

Insights

Early growth response protein 1 (Egr-1) is downregulated in breast cancer, inhibiting cell cycle progression. Egr-1 overexpression arrests breast cancer cells at the G0/G1 phase by targeting cell cycle genes.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Genetics

Background:

  • Early growth response protein 1 (Egr-1) is a nuclear transcription factor implicated in tumorigenesis across various cancers.
  • Limited data exists on the specific role of Egr-1 in breast cancer development and progression.

Purpose of the Study:

  • To investigate the expression levels of Egr-1 in breast cancer tissues and cell lines.
  • To elucidate the functional role of Egr-1 in regulating breast cancer cell cycle progression.

Main Methods:

  • Immunohistochemistry was employed to assess Egr-1 expression in breast tissues.
  • Breast cancer cell lines (BT549 and Bcap37) were utilized for functional studies.
  • Luciferase reporter assays were performed to determine Egr-1's interaction with target gene promoters.

Main Results:

  • Egr-1 expression was found to be significantly downregulated in breast cancer tissues compared to adjacent normal tissues.
  • Overexpression of Egr-1 led to the arrest of cell cycle progression in breast cancer cells.
  • Egr-1 was identified to bind to the promoter regions of CyclinD1, CyclinD2, and CyclinD3, inhibiting the G0/G1 phase.

Conclusions:

  • Egr-1 plays a critical role in regulating the cell cycle of breast cancer cells.
  • The mechanism involves the inhibition of the G0/G1 phase, potentially through the regulation of Cyclin D genes.
  • These findings offer novel insights into the function of Egr-1 in breast cancer, suggesting its potential as a therapeutic target.
Keywords:
CyclinDEgr-1breast cancercell cycle

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