Tumorspheres derived from prostate cancer cells possess chemoresistant and cancer stem cell properties

Linlin Zhang, Min Jiao, Lei Li, Dapeng Wu, Kaijie Wu, Xiang Li, Guodong Zhu, Qiang Dang, Xinyang Wang, Jer Tsong Hsieh, Dalin He

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Purpose: Prostate cancer (PCa) becomes lethal when cancer cells develop into castration-resistant PCa, which remains incurable because of the poor understanding of their cell origin and characteristics. We aim to investigate the potential role of cancer stem cells (CSCs) in PCa progression. Methods: Human PCa cell lines (LNCaP, 22RV1, DU145 and PC-3) were plated in serum-free suspension culture system allowed for tumorsphere forming. To evaluate the CSC characteristics of tumorspheres, the self-renewal, chemoresistance, tumorigenicity of the PCa tumorsphere cells, and the expression levels of stemness-related proteins in the PCa tumorsphere cells were assessed, comparing with the parental adherent cells. Results: Tumorsphere cells from PCa cell lines displayed enhanced self-renewal, chemoresistance and tumor-initiating capacity when compared with the adherent cells. Additionally, these cells overexpressed CSC marker CD44. Also, the tumorsphere cells expressed high levels of "stemness" genes Gli1, ABCG2 and Bmi-1. Conclusions: Collectively, these data demonstrated that tumorspheres derived from PCa cells possess chemoresistant and CSC properties. Our study suggests that the identification of PCa CSCs could provide new insight into the lethal phenotype of PCa and therapeutic implications.

Original languageEnglish (US)
Pages (from-to)675-686
Number of pages12
JournalJournal of Cancer Research and Clinical Oncology
Volume138
Issue number4
DOIs
StatePublished - Apr 2012

Keywords

  • Cancer stem cell
  • Chemoresistance
  • Prostate cancer
  • Stemness
  • Tumorsphere

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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