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IFNgamma sensitization to TRAIL-induced apoptosis in human thyroid carcinoma cells by upregulating Bak expression

Su He Wang1, Emese Mezosi, Julie M Wolf

  • 1Department of Medicine, University of Michigan Medical Center, Ann Arbor, MI, USA.

Oncogene
|December 3, 2003
PubMed

Insights

Combining interferon-gamma (IFNγ) with TRAIL effectively triggers apoptosis in resistant thyroid cancer cells. This combination therapy significantly inhibits tumor growth in vivo, with Bak upregulation identified as a key mechanism.

Area of Science:

  • Oncology
  • Molecular Biology
  • Immunology

Background:

  • TRAIL (TNF-related apoptosis-inducing ligand) induces apoptosis in tumor cells and is a promising cancer treatment.
  • TRAIL spares most normal tissues, distinguishing it from other TNF family members.
  • Thyroid cancer, particularly anaplastic carcinoma, often exhibits resistance to conventional therapies.

Purpose of the Study:

  • To investigate the synergistic effect of interferon-gamma (IFNγ) and TRAIL on resistant thyroid cancer cells.
  • To elucidate the molecular mechanisms underlying IFNγ-sensitized TRAIL-induced apoptosis in thyroid cancer.
  • To evaluate the in vitro and in vivo efficacy of the combined IFNγ and TRAIL therapy.

Main Methods:

  • In vitro apoptosis assays on thyroid anaplastic carcinoma (ARO) cells treated with IFNγ and TRAIL.
  • In vivo mouse thyroid tumor model to assess tumor growth inhibition.
  • Microarray analysis to screen for gene alterations induced by IFNγ.
  • RNase protection assay and Western blot to confirm Bak gene and protein expression.
  • Gene silencing and overexpression studies using antisense Bak to validate its role.

Main Results:

  • IFNγ combined with TRAIL induced significant apoptosis in resistant thyroid cancer cell lines (ARO cells), while single agents had minimal effect.
  • The combination therapy significantly inhibited tumor growth in a mouse thyroid tumor model.
  • Microarray analysis revealed marked upregulation of the proapoptotic gene Bak by IFNγ.
  • Increased Bak expression at both mRNA and protein levels was confirmed, and this was essential for IFNγ-sensitized TRAIL-induced apoptosis.
  • Overexpression of Bak alone sensitized ARO cells to TRAIL-induced apoptosis, bypassing the need for IFNγ.

Conclusions:

  • IFNγ sensitizes resistant thyroid cancer cells to TRAIL-induced apoptosis.
  • Bak is a critical mediator in the IFNγ-facilitated TRAIL-mediated apoptotic pathway in thyroid cancer.
  • The combination of IFNγ and TRAIL, mediated by Bak upregulation, represents a potential therapeutic strategy for thyroid cancer.

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