EMMPRIN Down-regulating miR-106a/b Modifies Breast Cancer Stem-like Cell Properties via Interaction with Fibroblasts Through STAT3 and HIF-1α

Sci Rep. 2016 Jun 21:6:28329. doi: 10.1038/srep28329.

Abstract

Extracellular matrix metalloproteinase inducer (EMMPRIN) is a heavily glycosylated protein and expresses in cancer cells widely, which plays important roles in tumor progression. However, the role of EMMPRIN in breast cancer stem-like cell properties by interaction with fibroblasts is not known. In the present study, we investigated the effects of fibroblasts on breast cancer stem-like cells. We found that fibroblasts activated by co-cultured breast cancer cells produced higher levels of EMMPRIN, which stimulated the stem-like cell specific, self-renewal and sphere-forming phenotype in breast cancer cells. Increased EMMPRIN expression in activated fibroblasts increased the expression of STAT3 and HIF-1α and showed cancer stem-like cell features in breast cancer cells. We also found that EMMPRIN could down-regulate miR-106a and miR-106b expression in breast cancer cells, which led to activating STAT3 and enhancing HIF-1α expression. Our results illustrated that EMMPRIN has an important role in breast cancer stem-like cells by activation STAT3/HIF-1α through interaction with cancer cells and fibroblasts. The study for the first time indicated that cancer cells and fibroblasts interaction promotes breast cancer cells showing stem-like cells through up-regulation EMMPRIN, and led to inhibiting miR-106a/b expression which targets both STAT3 and HIF-1α expression.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 3' Untranslated Regions
  • Base Sequence
  • Basigin / physiology*
  • Binding Sites
  • Breast Neoplasms / metabolism*
  • Breast Neoplasms / pathology
  • Coculture Techniques
  • Down-Regulation
  • Female
  • Fibroblasts / metabolism*
  • Gene Expression Regulation, Neoplastic
  • Humans
  • Hypoxia-Inducible Factor 1, alpha Subunit / metabolism
  • MCF-7 Cells
  • MicroRNAs / genetics*
  • MicroRNAs / metabolism
  • Neoplastic Stem Cells / metabolism*
  • RNA Interference
  • STAT3 Transcription Factor / metabolism

Substances

  • 3' Untranslated Regions
  • BSG protein, human
  • HIF1A protein, human
  • Hypoxia-Inducible Factor 1, alpha Subunit
  • MIRN106 microRNA, human
  • MicroRNAs
  • STAT3 Transcription Factor
  • STAT3 protein, human
  • Basigin