Overexpression of p27Kip1 induces growth arrest and apoptosis in an oral cancer cell line

Supriatno, Koji Harada, Mohammad O Hoque, Takashi Bando, Hideo Yoshida, Mitsunobu Sato

Research output: Contribution to journalArticlepeer-review


p27Kip1 is a cyclin-dependent kinase inhibitor which regulates progression of cells from G1 into S phase in a cell cycle. Loss of p27Kip1 has been associated with disease progression and an unfavorable outcome in several malignancies. In the present study, we conducted to examine whether up-regulation or down-regulation of p27KiP1 can affect the growth of oral cancer cell (B88 cell) in vitro and in vivo. We constructed an expression vector containing sense- or antisense-oriented human p27Kip1 cDNA with pcDNA3.1(Invitrogen). We transfected B88 cells with the sense or antisense expression vector to regulate the expression of p27Kip1 gene in each transfectant. The expression of p27Kip1 protein was up-regulated in the sense transfectants and down-regulated in the antisense transfectants. Moreover, up-regulation of p27Kip1 protein exerted the growth inhibitory effect, and down-regulation of p27Kip1 protein enhanced the growth of B88 cells in vitro and in vivo. Furthermore, we detected the G1 arrest and sub-G1 peak in the sense transfectants by flow cytometry analysis. These results suggest that up-regulation of p27Kip1 protein may exert the growth inhibitory effects through induction of G1 arrest and apoptosis on oral cancer cell line.

Original languageEnglish (US)
Pages (from-to)730-736
Number of pages7
JournalOral Oncology
Issue number7
StatePublished - 2002
Externally publishedYes


  • Cell cycle
  • Oral cancer
  • Tumor suppression
  • p27

ASJC Scopus subject areas

  • Oral Surgery
  • Oncology
  • Cancer Research

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