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4SC-202 activates ASK1-dependent mitochondrial apoptosis pathway to inhibit hepatocellular carcinoma cells

Meili Fu1, Fuqiang Wan2, Zhengling Li3

  • 1Department of Infectious Disease, Linyi People's Hospital, Linyi 276000, China.

Biochemical and Biophysical Research Communications
|January 17, 2016
PubMed

Insights

The novel HDAC inhibitor 4SC-202 effectively kills hepatocellular carcinoma (HCC) cells by activating the ASK1-dependent mitochondrial apoptosis pathway. This targeted approach shows promise for treating liver cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Hepatocellular carcinoma (HCC) remains a significant global health challenge.
  • Targeting specific molecular pathways offers a promising strategy for HCC treatment.
  • Histone deacetylase inhibitors (HDACi) are emerging as potential anti-cancer agents.

Purpose of the Study:

  • To investigate the anti-HCC activity of 4SC-202, a novel class I HDAC inhibitor.
  • To elucidate the signaling mechanisms underlying 4SC-202's effects on HCC cells.

Main Methods:

  • Treatment of HCC cell lines and primary HCC cells with 4SC-202.
  • Analysis of apoptosis markers, including mitochondrial permeability transition pore (mPTP) opening, cytochrome C release, and caspase activation.
  • Investigating the role of cyclophilin-D (Cyp-D) and apoptosis signal-regulating kinase 1 (ASK1) in 4SC-202-induced apoptosis.
  • Utilizing caspase inhibitors, mPTP blockers, and shRNA-mediated knockdown.

Main Results:

  • 4SC-202 demonstrated potent cytotoxic and proliferation-inhibitory effects on various HCC cells.
  • 4SC-202 activated the mitochondrial apoptosis pathway, evidenced by mPTP opening and caspase activation.
  • ASK1 activation, translocation to mitochondria, and complexation with Cyp-D were crucial for 4SC-202-induced apoptosis.
  • Inhibition of this pathway significantly attenuated 4SC-202's anti-cancer effects.

Conclusions:

  • 4SC-202 potently inhibits human HCC cells through the activation of the ASK1-dependent mitochondrial apoptosis pathway.
  • This study identifies 4SC-202 as a potential therapeutic agent for HCC.
  • The findings highlight the critical role of the ASK1-Cyp-D complex in mediating HDACi-induced apoptosis in HCC.
Keywords:
4SC-202ASK1 and cyclophilin-DHDAC inhibitorHepatocellular carcinoma (HCC)Mitochondrial apoptosis pathway

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