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Filamin A inhibits tumor progression through regulating BRCA1 expression in human breast cancer

Yundi Guo1, Ming Li2, Guanghui Bai2

  • 1Suzhou Vocational Health College, Suzhou, Jiangsu 215009, P.R. China.

Oncology Letters
|November 9, 2018
PubMed

Insights

Filamin A (FlnA) protein expression in breast cancer correlates with Breast Cancer Gene 1 (BRCA1) expression and tumor size. This association suggests FlnA may influence BRCA1 regulation and offers insights into breast cancer progression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Filamin A (FlnA) is an actin cross-linking protein implicated in tumor progression across various cancers.
  • FlnA is known to interact with Breast Cancer Gene 1 (BRCA1), a critical tumor suppressor.
  • The association between FlnA and BRCA1 in human carcinomas remains largely unexplored.

Purpose of the Study:

  • To investigate the clinical significance of FlnA and BRCA1 expression in breast cancer patients.
  • To explore the relationship between FlnA, BRCA1, and clinicopathological features.
  • To examine the potential regulatory role of FlnA on BRCA1 expression.

Main Methods:

  • Immunohistochemistry on a tissue microarray from 424 breast cancer patients.
  • RNA interference to downregulate FlnA expression in the MCF-7 breast cancer cell line.
  • Correlation analysis between FlnA and BRCA1 expression and clinical parameters.

Main Results:

  • FlnA expression was observed in 137 breast cancer patients with high BRCA1 expression, correlating with longer survival.
  • Significant associations were found between FlnA expression and tumor size, and FlnA expression and progesterone receptor status.
  • Downregulation of FlnA in MCF-7 cells suggested a potential regulatory role in BRCA1 expression.

Conclusions:

  • FlnA expression is associated with BRCA1 expression and tumor size in breast cancer.
  • These findings highlight the clinical significance of FlnA in breast cancer progression.
  • Further research into FlnA's role in BRCA1 regulation is warranted for therapeutic implications.
Keywords:
breast cancer gene 1filamin Ahuman breast cancertumor progression

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