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Diazene JK-279 induces apoptosis-like cell death in human cervical carcinoma cells

S Jakopec1, K Dubravcic, S Polanc

  • 1Department of Molecular Biology, Rudjer Boskovic Institute, Bijenicka cesta 54, HR-10000 Zagreb, Croatia.

Toxicology in Vitro : an International Journal Published in Association with BIBRA
|August 3, 2005
PubMed

Insights

Diazene N-phenyl-2-(2-pyridinyl)diazenecarboxamide (JK-279) exhibits cytotoxicity against HeLa cells by inducing G2/M arrest and caspase-independent cell death. This compound offers potential as a novel cancer therapeutic agent.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Diazene N-phenyl-2-(2-pyridinyl)diazenecarboxamide (JK-279) is a novel cytotoxic compound effective against various tumor cell lines.
  • JK-279 reduces intracellular glutathione and enhances cisplatin sensitivity in human cervical carcinoma (HeLa) cells.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the cytotoxic effects of JK-279 in HeLa cells.
  • To determine if JK-279-induced cell death is mediated by apoptosis or other pathways.

Main Methods:

  • Cytotoxicity assessed using the MTT assay.
  • Flow cytometry used to analyze cell cycle progression and apoptosis markers (e.g., PS externalization).
  • Western blotting or similar techniques to evaluate protein expression (p21, survivin, caspases, Bcl-2, Bax, PARP).

Main Results:

  • JK-279 induced G2/M cell cycle arrest, linked to increased p21 expression and altered survivin levels.
  • High concentrations of JK-279 caused apoptosis-like nuclear morphology, but without caspase activation (caspase-3, -9) or PARP cleavage.
  • Phosphatidylserine (PS) externalization and internucleosomal DNA fragmentation were observed, indicating programmed cell death.
  • Partial necrosis was also detected.

Conclusions:

  • The cytotoxicity of JK-279 in HeLa cells is primarily mediated by caspase-independent cell death, exhibiting some features of apoptosis.
  • JK-279 activates alternative cell death pathways, making it a promising candidate for cancer therapy, especially against apoptosis-resistant cancers.

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