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Anticancer agents sensitize tumor cells to tumor necrosis factor-related apoptosis-inducing ligand-mediated caspase-8

S Lacour1, A Hammann, A Wotawa

  • 1Institut National de la Santé et de la Recherche Médicale U517, Facultés de Médicine et de Pharmacie, Dijon, France.

Cancer Research
|March 14, 2001
PubMed

Insights

Chemotherapy sensitizes resistant colon cancer cells to TRAIL-induced apoptosis by lowering the signaling threshold for caspase-8 activation. This enhances the effectiveness of TRAIL therapy in colon tumors.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) induces cancer cell apoptosis.
  • Cancer cells can develop resistance to TRAIL.
  • Chemotherapeutic drugs can restore TRAIL sensitivity in resistant tumor cells.

Purpose of the Study:

  • To investigate the mechanisms underlying colon cancer cell sensitivity to TRAIL.
  • To explore how chemotherapeutic drugs modulate TRAIL-induced apoptosis in colon cancer.

Main Methods:

  • Comparison of four human colon carcinoma cell lines.
  • Flow cytometry to assess TRAIL receptor expression.
  • Analysis of caspase activation pathways.
  • Treatment with TRAIL, cisplatin, and doxorubicin.

Main Results:

  • Colon cancer cell sensitivity to TRAIL correlates with TRAIL-R1 and TRAIL-R2 expression.
  • Chemotherapeutic drugs (cisplatin, doxorubicin) sensitize resistant cells to TRAIL without altering receptor expression.
  • TRAIL induces caspase-dependent apoptosis via procaspase-8 activation.
  • Chemotherapy lowers the threshold for TRAIL-induced procaspase-8 activation, leading to Bid cleavage and effector caspase activation.

Conclusions:

  • Chemotherapeutic drugs enhance TRAIL-mediated apoptosis in colon cancer by sensitizing the caspase-8 activation pathway.
  • This combination strategy offers a potential approach to overcome TRAIL resistance in colon tumors.

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