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Mcl-1 overexpression in hepatocellular carcinoma: a potential target for antisense therapy

Wolfgang Sieghart1, Doris Losert, Sabine Strommer

  • 1Section of Experimental Oncology/Molecular Pharmacology, Department of Clinical Pharmacology, Medical University Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria.

Journal of Hepatology
|November 18, 2005
PubMed
Abstract

Insights

The anti-apoptotic Mcl-1 protein is overexpressed in hepatocellular carcinoma (HCC) and targeting it with antisense oligonucleotides (ASO) shows promise as a novel HCC therapy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Therapeutics

Background:

  • The anti-apoptotic Mcl-1 protein is implicated as a resistance factor in various cancers.
  • Investigating Mcl-1 expression in hepatocellular carcinoma (HCC) is crucial for understanding therapeutic resistance.

Purpose of the Study:

  • To determine the presence and significance of Mcl-1 protein in HCC tissues.
  • To evaluate Mcl-1 as a potential molecular drug target for HCC therapy.

Main Methods:

  • Immunohistochemistry was used to assess Mcl-1 expression in 149 HCC specimens.
  • Antisense oligonucleotides (ASO) targeting Mcl-1 were tested as monotherapy and in combination with cisplatin in HCC cell lines (HepG2, Snu398).
  • Western blotting, cell counting, and FACS analysis were employed to evaluate protein regulation, cell viability, and apoptosis.

Main Results:

  • Mcl-1 protein was overexpressed in 51% of HCC cases.
  • Mcl-1 ASO treatment led to significant dose- and time-dependent reduction in Mcl-1 expression, decreased cell viability, and increased apoptosis in HCC cells.
  • Mcl-1 ASO demonstrated significant chemosensitizing effects when combined with cisplatin.

Conclusions:

  • Mcl-1 is overexpressed in a substantial proportion of HCC tissues.
  • Targeting Mcl-1 with ASO exhibits potent single-agent and chemosensitizing activity against HCC in vitro.
  • Mcl-1 targeting represents a promising novel therapeutic strategy for hepatocellular carcinoma.

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