Inhibition of cortactin and SIRT1 expression attenuates migration and invasion of prostate cancer DU145 cells

Keita Nakane, Yasunori Fujita, Riyako Terazawa, Yuko Atsumi, Taku Kato, Yoshinori Nozawa, Takashi Deguchi, Masafumi Ito

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

Objectives: Cortactin is overexpressed in various types of cancer and enhances cell motility. It has been recently reported that silent mating type information regulation2 homolog1 interacts with cortactin and promotes cell migration. Here, we examined the role of cortactin and silent mating type information regulation 2 homolog 1 in migration and invasion of prostate cancer cells. Methods: The cortactin expression levels in DU145, LNCaP and PC3 prostate cancer cells, and in PrEC normal human prostate epithelial cells were evaluated by western blot analysis. In DU145 cells, the expression of cortactin or silent mating type information regulation 2 homolog 1 was inhibited by small interfering RNA, and the effects of their knockdown on migration and invasion were examined by cell migration and invasion assays. To determine the localization of cortactin and silent mating type information regulation 2 homolog 1, western blot and immunofluorescence microscopic analyses were carried out. The functional interaction between silent mating type information regulation 2 homolog 1 and cortactin was also studied by invivo acetylation assay. Results: The protein expression of cortactin was significantly higher in DU145 cells than in other cell lines. Knockdown of cortactin or silent mating type information regulation 2 homolog 1 expression inhibited both migration and invasion of DU145 cells. Similarly to cortactin, silent mating type information regulation 2 homolog 1 was found to be predominantly expressed in the cytoplasm. Finally, the knockdown of silent mating type information regulation 2 homolog 1 expression increased the acetylation level of cortactin. Conclusions: Our findings suggest that inhibition of cortactin or silent mating type information regulation 2 homolog 1 expression attenuates migration and invasion of DU145 cells and this could represent a promising strategy to regulate metastasis of prostate cancer.

Original languageEnglish
Pages (from-to)71-79
Number of pages9
JournalInternational Journal of Urology
Volume19
Issue number1
DOIs
Publication statusPublished - 01-2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Urology

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