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Black Rice Anthocyanins Suppress Metastasis of Breast Cancer Cells by Targeting RAS/RAF/MAPK Pathway

Xiang-Yan Chen1, Jie Zhou1, Li-Ping Luo1

  • 1Department of Public Health, Chengdu Medical College, Chengdu 610500, China.

Biomed Research International
|December 10, 2015
PubMed

Insights

Black rice anthocyanins (BRACs) suppress metastasis in HER2-positive breast cancer by targeting the RAS/RAF/MAPK pathway. BRACs inhibit cell migration and invasion by downregulating key proteins involved in this signaling cascade.

Area of Science:

  • Oncology
  • Molecular Biology
  • Nutritional Science

Background:

  • HER2 overexpression drives approximately 30% of breast cancers.
  • The RAS/RAF/MAPK pathway is crucial for HER2 signaling and breast cancer development.
  • Identifying novel chemopreventive agents targeting this pathway is critical.

Purpose of the Study:

  • To investigate the molecular mechanisms of black rice anthocyanins (BRACs) in HER2-positive breast cancer.
  • To identify the molecular targets of BRACs within the RAS/RAF/MAPK pathway.
  • To evaluate the antimetastatic potential of BRACs in HER2-positive breast cancer cells.

Main Methods:

  • Treatment of MDA-MB-453 (HER2-positive) cells with BRACs extract.
  • Assessing cell migration, invasion, and protein/mRNA expression of key signaling molecules (RAF, MEK, JNK, MMP2, MMP9).
  • Investigating protein-protein interactions and utilizing small interfering RNAs (siRNAs) for gene silencing.

Main Results:

  • BRACs inhibited cell migration and invasion, suppressed RAF, MEK, and JNK activation, and downregulated MMP2/MMP9 secretion.
  • BRACs weakened interactions between HER2 and RAF, MEK, and JNK, decreasing their mRNA expression.
  • Combined treatment with BRACs and RAF/MEK/JNK inhibitors or siRNAs showed enhanced antimetastatic effects.

Conclusions:

  • BRACs effectively suppress metastasis in HER2-positive breast cancer cells.
  • BRACs exert their effects by targeting the RAS/RAF/MAPK signaling pathway.
  • BRACs represent a potential chemopreventive agent against HER2-driven breast cancer progression.

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