Tumor Biology

, Volume 37, Issue 5, pp 6737–6747 | Cite as

Combating trastuzumab resistance by targeting thioredoxin-1/PTEN interaction

  • Akram Sadeghirizi
  • Razieh Yazdanparast
  • Safiyeh Aghazadeh
Original Article

Abstract

Trastuzumab is by far the drug of choice for treatment of human epidermal growth factor receptor 2 (Her2) overexpressing breast cancer patients. However, frequently, the therapy remains ineffective due to the induced drug resistance. In spite of various reported mechanisms, we hypothesize that the acquired resistance to trastuzumab might be attributed to the failure of the drug to activate phosphatase and tensin homolog (PTEN) mainly due to the high level of reduced thioredoxin-1 protein among the resistant cells. In the present study, the effect(s) of PX-12, a Trx-1 inhibitor, was examined on proliferation of breast cancer cells which are unresponsive to trastuzumab. Treatment of the cells with PX-12 (5 μM) and trastuzumab (10 μg/ml) reduced cells viabilities, p-Akt, and Bcl2 levels while increasing the levels of reactive oxygen species (ROS) and p-JNK with consequent higher levels of G1 arrest and apoptosis among the resistant cells compared to parental trastuzumab sensitive cells. The most significant observation was that PX-12/trastuzumab co-treatment enhanced the cell membrane localization of PTEN which is believed to be the active biological form of the signal. Our data confirmed that Trx-1 inhibition is required for chemosensitization of resistant breast cancer cells to anti-Her2 therapy, and this approach might offer an alternative clinical strategy for preventing acquired resistance.

Keywords

Breast cancer Her2 PTEN Thioredoxin-1 Trastuzumab resistance 

Notes

Acknowledgments

The authors appreciate the joint financial support of this investigation by the Research Council of University of Tehran and the Iranian National Science Foundation.

Compliance with Ethical Standards

Conflicts of interest

None

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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2015

Authors and Affiliations

  • Akram Sadeghirizi
    • 1
  • Razieh Yazdanparast
    • 1
  • Safiyeh Aghazadeh
    • 1
  1. 1.Institute of Biochemistry and BiophysicsUniversity of TehranTehranIran

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