Zoledronic acid induces autophagic cell death in human prostate cancer cells

Ji Fan Lin, Yi Chia Lin, Yi Hsuan Lin, Te Fu Tsai, Kuang Yu Chou, Hung En Chen, Yi-Sheng Huang

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Purpose: Bisphosphonates are potent inhibitors of bone resorption. In vitro studies show that zolendronic acid inhibits prostate cancer cell growth by activating apoptosis. We investigated whether zolendronic acid also inhibits prostate cancer cell growth by autophagy (type II programmed cell death). Materials and Methods: We investigated the induction of autophagy in the PC-3, DU-145, LNCaP and CRW22Rv1 cell lines upon zolendronic acid treatment. LC3-II protein formation was detected by Western blot. LC3-II incorporation into autophagosomes was detected by immunofluorescence staining. Acidic organelle formation was detected by acridine orange staining. Rescue experiments using an apoptosis inhibitor and/or an autophagy inhibitor were performed by MTT assay. Results: Autophagy induction was detected by formation of the LC3-II protein after exposure to 100 μM zolendronic acid. LC3-II and caspase-3 processing was detected 6 days after treatment. Acidic organelles were detectable by acridine orange staining and immunofluorescence showed round-up and condensed staining of LC3-II, suggesting autophagosome formation in the cytoplasm during autophagic cell death. Cell growth was rescued only by administering an apoptosis and autophagy inhibitor during zolendronic acid treatment, indicating that zolendronic acid induces prostate cancer death by apoptotic and autophagic cell death. Conclusions: To our knowledge we report the first study showing that zolendronic acid markedly inhibits human prostate cancer cell growth through autophagic cell death. Zolendronic acid shows its anticancer activity via apoptosis and autophagy. These findings can potentially contribute to the beneficial use of zolendronic acid for prostate cancer treatment.

Original languageEnglish
Pages (from-to)1490-1496
Number of pages7
JournalJournal of Urology
Volume185
Issue number4
DOIs
Publication statusPublished - Apr 2011

Fingerprint

zoledronic acid
Autophagy
Prostatic Neoplasms
Acids
Apoptosis
Staining and Labeling
Acridine Orange
Growth
Organelles
Fluorescent Antibody Technique
Bone Density Conservation Agents

Keywords

  • apoptosis
  • autophagy
  • prostate
  • prostatic neoplasms
  • zoledronic acid

ASJC Scopus subject areas

  • Urology

Cite this

Lin, J. F., Lin, Y. C., Lin, Y. H., Tsai, T. F., Chou, K. Y., Chen, H. E., & Huang, Y-S. (2011). Zoledronic acid induces autophagic cell death in human prostate cancer cells. Journal of Urology, 185(4), 1490-1496. https://doi.org/10.1016/j.juro.2010.11.045

Zoledronic acid induces autophagic cell death in human prostate cancer cells. / Lin, Ji Fan; Lin, Yi Chia; Lin, Yi Hsuan; Tsai, Te Fu; Chou, Kuang Yu; Chen, Hung En; Huang, Yi-Sheng.

In: Journal of Urology, Vol. 185, No. 4, 04.2011, p. 1490-1496.

Research output: Contribution to journalArticle

Lin, JF, Lin, YC, Lin, YH, Tsai, TF, Chou, KY, Chen, HE & Huang, Y-S 2011, 'Zoledronic acid induces autophagic cell death in human prostate cancer cells', Journal of Urology, vol. 185, no. 4, pp. 1490-1496. https://doi.org/10.1016/j.juro.2010.11.045
Lin, Ji Fan ; Lin, Yi Chia ; Lin, Yi Hsuan ; Tsai, Te Fu ; Chou, Kuang Yu ; Chen, Hung En ; Huang, Yi-Sheng. / Zoledronic acid induces autophagic cell death in human prostate cancer cells. In: Journal of Urology. 2011 ; Vol. 185, No. 4. pp. 1490-1496.
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AB - Purpose: Bisphosphonates are potent inhibitors of bone resorption. In vitro studies show that zolendronic acid inhibits prostate cancer cell growth by activating apoptosis. We investigated whether zolendronic acid also inhibits prostate cancer cell growth by autophagy (type II programmed cell death). Materials and Methods: We investigated the induction of autophagy in the PC-3, DU-145, LNCaP and CRW22Rv1 cell lines upon zolendronic acid treatment. LC3-II protein formation was detected by Western blot. LC3-II incorporation into autophagosomes was detected by immunofluorescence staining. Acidic organelle formation was detected by acridine orange staining. Rescue experiments using an apoptosis inhibitor and/or an autophagy inhibitor were performed by MTT assay. Results: Autophagy induction was detected by formation of the LC3-II protein after exposure to 100 μM zolendronic acid. LC3-II and caspase-3 processing was detected 6 days after treatment. Acidic organelles were detectable by acridine orange staining and immunofluorescence showed round-up and condensed staining of LC3-II, suggesting autophagosome formation in the cytoplasm during autophagic cell death. Cell growth was rescued only by administering an apoptosis and autophagy inhibitor during zolendronic acid treatment, indicating that zolendronic acid induces prostate cancer death by apoptotic and autophagic cell death. Conclusions: To our knowledge we report the first study showing that zolendronic acid markedly inhibits human prostate cancer cell growth through autophagic cell death. Zolendronic acid shows its anticancer activity via apoptosis and autophagy. These findings can potentially contribute to the beneficial use of zolendronic acid for prostate cancer treatment.

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