Y-box binding protein-1 (YB-1) promotes cell cycle progression through CDC6-dependent pathway in human cancer cells

Yuji Basaki, Ken ichi Taguchi, Hiroto Izumi, Yuichi Murakami, Takuya Kubo, Fumihito Hosoi, Kosuke Watari, Kenji Nakano, Hidetoshi Kawaguchi, Shinji Ohno, Kimitoshi Kohno, Mayumi Ono, Michihiko Kuwano

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)


Y-box binding protein-1 (YB-1) plays pivotal roles in acquisition of global drug resistance and cell growth promotion through transcriptional activation of genes for both drug resistance and growth factor receptors. In this study, we investigated whether YB-1 is involved in regulation of the cell cycle and cell proliferation of human cancer cells. Treatment with YB-1 siRNA caused a marked suppression of cell proliferation and expression of a cell cycle related gene, CDC6 by cancer cells. Of cell cycle of cancer cells, S phase content was specifically reduced by knockdown of YB-1. The overexpression of CDC6 abrogated this inhibition of both cell proliferation and S phase entry. ChIP assay demonstrated that YB-1 binds to a Y-box located in the promoter region of the CDC6 gene. Expression of cyclin D1, CDK1 and CDK2 was also reduced with increased expression of p21Cip1 and p16INK4A when treated with YB-1 siRNA. Furthermore, the nuclear YB-1 expression was significantly associated with the level of CDC6 nuclear expression in patients with breast cancer. In conclusion, YB-1 plays an important role in cell cycle progression at G1/S of human cancer cells. YB-1 thus could be a potent biomarker for tumour growth and cell cycle in its close association with CDC6.

Original languageEnglish
Pages (from-to)954-965
Number of pages12
JournalEuropean Journal of Cancer
Issue number5
Publication statusPublished - Mar 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research


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