Transforming growth factor-Β decreases the cancer-initiating cell population within diffuse-type gastric carcinoma cells

S. Ehata, E. Johansson, R. Katayama, S. Koike, A. Watanabe, Y. Hoshino, Y. Katsuno, A. Komuro, D. Koinuma, M. R. Kano, M. Yashiro, K. Hirakawa, H. Aburatani, N. Fujita, K. Miyazono

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

Stem cells in normal tissues and cancer-initiating cells (CICs) are known to be enriched in side population (SP) cells. However, the factors responsible for the regulation of expression of ABCG2, involved in efflux of dyes, in SP cells have not been fully investigated. Here, we characterized the SP cells within diffuse-type gastric carcinoma, and examined the effects of transforming growth factor-Β (TGF-Β) on SP cells. Diffuse-type gastric carcinoma cells established from four independent patients universally contained SP cells between 1 and 4% of total cells, which displayed greater tumorigenicity than non-SP cells did. TGF-Β repressed the transcription of ABCG2 through direct binding of Smad2/3 to its promoter/enhancer, and the number of SP cells and the tumor-forming ability of cancer cells were decreased by TGF-Β, although ABCG2 is not directly involved in the tumor-forming ability of SP cells. Cancer cells from metastatic site expressed much higher levels of ABCG2 and included a greater percentage of SP cells than parental cancer cells did. SP cells are thus responsible for the progression of diffuse-type gastric carcinoma, and TGF-Β negatively contributes to maintain the CICs within the cancer.

Original languageEnglish
Pages (from-to)1693-1705
Number of pages13
JournalOncogene
Volume30
Issue number14
DOIs
Publication statusPublished - Apr 7 2011
Externally publishedYes

Keywords

  • ABCG2
  • SP cell
  • TGF-β
  • cancer-initiating cell
  • diffuse type gastric carcinoma

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cancer Research

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