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An Orthotopic Murine Model of Human Prostate Cancer Metastasis
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Published on: September 18, 2013

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Platycodin D induces tumor growth arrest by activating FOXO3a expression in prostate cancer in vitro and in vivo

Rui Zhou, Zongliang Lu, Kai Liu

  • 1Department of Nutrition, Daping Hospital and Research Institute of Surgery, Third Military Medical University, Chongqing 400042, China. hongxiaxu@tmmu.edu.cn.

Current Cancer Drug Targets
|November 29, 2014
PubMed

Insights

Platycodin D (PD) shows significant anti-prostate cancer activity by inhibiting cell proliferation and inducing apoptosis. This natural compound

Area of Science:

  • Pharmacology
  • Cancer Biology
  • Natural Products Chemistry

Background:

  • Prostate cancer remains a significant health concern with limited therapeutic options.
  • Platycodin D (PD), a saponin from Platycodin grandiflorum, has shown potential anticancer properties.

Purpose of the Study:

  • To investigate the in vitro and in vivo efficacy of Platycodin D (PD) against prostate cancer.
  • To elucidate the molecular mechanisms underlying PD's anticancer effects, focusing on the FOXO3a pathway.

Main Methods:

  • Cytotoxicity assays (IC50) on prostate cancer cell lines (PC3, DU145, LNCaP) and a normal cell line (RWPE-1).
  • Cell proliferation (BrdU assay), apoptosis (Annexin V-FITC flow cytometry), and cell cycle analysis (PI staining) were performed.
  • Western blotting was used to analyze protein expression (FOXO3a, p-FOXO3a, MDM2, p21, p27) in vitro and in vivo (PC3 xenograft tumors).
  • Gene silencing (siRNA-MDM2) and overexpression (pcDNA3-MDM2) studies were conducted to assess MDM2's role.

Main Results:

  • PD exhibited significant cytotoxicity against prostate cancer cell lines (IC50: 11.17–26.13 μmol/L) with minimal effect on normal cells.
  • PD inhibited cell proliferation, induced apoptosis, and caused cell cycle arrest (G0/G1 or G2/M phase depending on cell line).
  • PD upregulated FOXO3a and its downstream targets (p21, p27) while downregulating p-FOXO3a and MDM2. MDM2 modulation affected FOXO3a expression.
  • PD dose-dependently inhibited PC3 xenograft tumor growth in mice, with similar molecular changes observed in tumor tissues.

Conclusions:

  • Platycodin D demonstrates potent anti-prostate cancer activity both in vitro and in vivo.
  • The FOXO3a transcription factor and its regulatory pathway involving MDM2 are crucial for PD's therapeutic effects.
  • PD represents a promising natural compound for the development of novel prostate cancer therapies.

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