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MiR-503 inhibited cell proliferation of human breast cancer cells by suppressing CCND1 expression

Jianting Long1, Caiwen Ou2, Haoming Xia3

  • 1Department of Medicinal Oncology, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080, People's Republic of China.

Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine
|June 7, 2015
PubMed

Insights

MicroRNA-503 (miR-503) is downregulated in breast cancer. Restoring miR-503 suppresses tumor growth by halting cell cycle progression, identifying it as a potential tumor suppressor.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Breast cancer is a leading cause of cancer mortality globally.
  • MicroRNAs (miRNAs) are increasingly recognized for their roles in cancer development.
  • Aberrant expression of miR-503 is implicated in various cancers.

Purpose of the Study:

  • To investigate the role of miR-503 in the pathogenesis of breast cancer.
  • To determine if miR-503 functions as a tumor suppressor in breast cancer.

Main Methods:

  • Analysis of miR-503 expression levels in breast cancer tissues and cells.
  • Overexpression of miR-503 in breast cancer cell lines.
  • Assessment of cell proliferation and cell cycle distribution.
  • Identification of miR-503 target genes.

Main Results:

  • miR-503 expression was significantly downregulated in breast cancer tissues and cells compared to normal controls.
  • Overexpression of miR-503 inhibited breast cancer cell proliferation.
  • miR-503 induced G0/G1 cell cycle arrest.
  • CCND1 was identified as a direct target of miR-503.

Conclusions:

  • miR-503 acts as a tumor suppressor in breast cancer.
  • Downregulation of miR-503 contributes to breast cancer progression.
  • miR-503 may serve as a potential therapeutic target for breast cancer treatment.
Keywords:
Breast cancerCCND1Cell cycleCell proliferationmiR-503

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