Inhibition of CD44 expression in hepatocellular carcinoma cells enhances apoptosis, chemosensitivity, and reduces tumorigenesis and invasion

Zhigang Xie, Pei Feng Choong, Lai Fong Poon, Jianbiao Zhou, Jiaying Khng, Viraj Janakakumara Jasinghe, Senthilnathan Palaniyandi, Chien Shing Chen

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

Purpose: CD44 is overexpressed in various tumors including hepatocellular carcinoma (HCC). The purpose of this study was to examine the effects of CD44 antisense oligonucleotide (ASO) alone or combination with doxorubicin on HCC cells in vitro. Methods: Cytotoxicity was measured by use of a cell viability assay in HCC cell line SNU-449. Tumorigenesis and invasion were accessed by colony formation, growth in soft agar and ECMatrix invasion assay. Apoptosis and necrosis were evaluated by using double staining with Hoechst 33342 and propidium iodide. Protein expression and mRNA level were detected by Western blot and RT-PCR. Results: We have designed novel CD44 ASO, which can effectively down-regulate CD44 expression in SNU-449. Colony formation, growth in soft agar and invasion were significantly impaired after CD44 ASO treatment in SNU-499. In company with CD44 down-regulated by CD44 ASO, MDR-1 and Bcl-2 expression were also greatly reduced. CD44 ASO also increased chemosensitivity to doxorubicin significantly, lowered IC50 by one order of magnitude. Apoptosis and necrosis were also induced by CD44 ASO alone or in combination treatment with doxorubicin. Conclusions: Inhibition of CD44 expression by CD44 ASO significantly induced apoptosis, decreased tumorigenesis and invasion, and increased chemosensitivity. Thus, CD44 ASO is potentially a therapy that is worth investigating in the clinical setting.

Original languageEnglish
Pages (from-to)949-957
Number of pages9
JournalCancer Chemotherapy and Pharmacology
Volume62
Issue number6
DOIs
StatePublished - Nov 2008

Bibliographical note

Funding Information:
Acknowledgments This study was supported by Singapore Cancer Syndicate Grant—TN0031, AN0038 and Terry Fox Run Cancer Research Grant 2004 (Chien-Shing Chen).

Keywords

  • Antisense oligonucleotides
  • CD44 antigen
  • Chemotherapy
  • Hepatocellular carcinoma

ASJC Scopus subject areas

  • Oncology
  • Toxicology
  • Pharmacology
  • Cancer Research
  • Pharmacology (medical)

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