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Targeting the XIAP/caspase-7 complex selectively kills caspase-3-deficient malignancies

Yuan-Feng Lin1, Tsung-Ching Lai, Chih-Kang Chang

  • 1Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan.

The Journal of Clinical Investigation
|August 28, 2013
PubMed

Insights

Targeting the XIAP:CASP7 interaction can kill cancer cells lacking Caspase-3 (CASP3/DR) and overcome drug resistance. This approach triggers apoptosis, offering a new strategy for treating aggressive malignancies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Caspase-3 downregulation (CASP3/DR) in tumors leads to therapy resistance and poor prognosis.
  • CASP3/DR cancer cells depend on caspase-7 (CASP7) for apoptosis, and XIAP inhibits activated CASP7 (p19/p12-CASP7).

Purpose of the Study:

  • To identify a therapeutic target to overcome CASP3/DR-mediated resistance.
  • To develop a protein-protein interaction (PPI) inhibitor for the XIAP:p19/p12-CASP7 complex.

Main Methods:

  • Identified the Cys246 residue pocket on p19/p12-CASP7 as a target for PPI inhibition.
  • Developed and tested a novel PPI inhibitor in vitro and in vivo.
  • Investigated the role of microRNA let-7a-1 in mediating CASP3/DR.

Main Results:

  • Inhibition of the XIAP:p19/p12-CASP7 PPI triggered CASP7-dependent apoptosis, selectively killing CASP3/DR tumors.
  • Treatment showed no adverse effects on non-tumor cells.
  • Targeting this PPI overcame multidrug resistance and resensitized cells to chemotherapy.
  • CASP3/DR and p19/p12-CASP7 accumulation correlated with aggressive cancers and poor patient prognosis.

Conclusions:

  • Targeting the XIAP:p19/p12-CASP7 complex offers a novel therapeutic strategy for CASP3/DR malignancies.
  • This approach bypasses apical caspases and selectively eliminates resistant cancer cells.
  • Findings elucidate the mechanism of CASP3/DR in cancer progression and resistance.

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