Abstract:
:The monoterpene perillyl alcohol (POH) is a naturally occurring compound derived from citrus fruits, mint and herbs. It exhibited chemotherapeutic potential against various malignant tumors in preclinical models and is currently being tested in clinical trials in patients with refractory advanced cancers. POH inhibits cellular proliferation at the G1 phase of the cell cycle in vitro. However, the molecular mechanisms responsible for this effect have not been sufficiently elucidated. Here we showed that 1.0 mM POH upregulates p15(INK4b) and p21(WAF1/Cip1), resulting in hypophosphorylation of the retinoblastoma (RB) protein and subsequent G1 arrest in human immortalized keratinocyte HaCaT cells. The induction of p15(INK4b) was mediated through its promoter, but that of p21(WAF1/Cip1) was not. The small interfering RNA (siRNA) of either p15(INK4b) or p21(WAF1/Cip1) significantly attenuated the increase in the G1 cell population caused by POH. The induction of p15(INK4b) and p21(WAF1/Cip1) and sub-sequent G1 arrest by POH was also observed in other cancer cell lines. These results suggest that the induction of p15(INK4b) as well as p21(WAF1/Cip1) is associated with the antiproliferative effect of POH.
journal_name
Oncol Repjournal_title
Oncology reportsauthors
Koyama M,Sowa Y,Hitomi T,Iizumi Y,Watanabe M,Taniguchi T,Ichikawa M,Sakai Tdoi
10.3892/or.2012.2167subject
Has Abstractpub_date
2013-02-01 00:00:00pages
779-84issue
2eissn
1021-335Xissn
1791-2431journal_volume
29pub_type
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