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Trastuzumab signaling in ErbB2-overexpressing inflammatory breast cancer correlates with X-linked inhibitor of apoptosis protein expression.

Publication ,  Journal Article
Aird, KM; Ding, X; Baras, A; Wei, J; Morse, MA; Clay, T; Lyerly, HK; Devi, GR
Published in: Mol Cancer Ther
January 2008

Inflammatory breast cancer (IBC) patients show poor survival and a significant incidence of epidermal growth factor receptor-2 (ErbB2) overexpression. A distinct mechanism involving increased expression of X-linked inhibitor of apoptosis protein (XIAP) and survivin, key members of the inhibitor of apoptosis protein (IAP) family, was observed post-trastuzumab (an ErbB2 monoclonal antibody) treatment in an ErbB2-overexpressing, estrogen receptor negative, IBC cellular model, SUM190PT, isolated from a primary IBC tumor. In contrast, a decrease in the IAP expression was observed in the non-IBC, ErbB2-overexpressing SKBR3 cells in which trastuzumab treatment also decreased p-AKT and cell viability. Further, in SUM190PT cells, therapeutic sensitivity to GW583340 (a dual epidermal growth factor receptor/ErbB2 kinase inhibitor) corresponded with XIAP down-regulation and abrogation of XIAP inhibition on active caspase-9 release. Specific small interfering RNA-mediated XIAP inhibition in combination with trastuzumab caused decrease in inactive procaspase-9 and inhibition of p-AKT corresponding with 45% to 50% decrease in cell viability in the SUM190PT cells, which have high steady-state p-AKT levels. Further, embelin, a small-molecule inhibitor that abrogates binding of XIAP to procaspase-9, caused significant decrease in SUM190PT viability. However, embelin in combination with trastuzumab failed to affect SUM190PT viability because it has no direct effect on XIAP, which is induced by trastuzumab treatment. These data have identified a novel functional link between ErbB2 signaling and antiapoptotic pathway mediated by XIAP. Blockade of the IAP antiapoptotic pathway alone or in combination would be an attractive strategy in IBC therapy.

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Published In

Mol Cancer Ther

DOI

ISSN

1535-7163

Publication Date

January 2008

Volume

7

Issue

1

Start / End Page

38 / 47

Location

United States

Related Subject Headings

  • X-Linked Inhibitor of Apoptosis Protein
  • Up-Regulation
  • Trastuzumab
  • Transgenes
  • Signal Transduction
  • Receptor, erbB-2
  • Receptor, ErbB-2
  • RNA, Small Interfering
  • Oncology & Carcinogenesis
  • Neuronal Apoptosis-Inhibitory Protein
 

Citation

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Aird, K. M., Ding, X., Baras, A., Wei, J., Morse, M. A., Clay, T., … Devi, G. R. (2008). Trastuzumab signaling in ErbB2-overexpressing inflammatory breast cancer correlates with X-linked inhibitor of apoptosis protein expression. Mol Cancer Ther, 7(1), 38–47. https://doi.org/10.1158/1535-7163.MCT-07-0370
Aird, Katherine M., Xiuyun Ding, Aris Baras, Junping Wei, Michael A. Morse, Timothy Clay, Herbert K. Lyerly, and Gayathri R. Devi. “Trastuzumab signaling in ErbB2-overexpressing inflammatory breast cancer correlates with X-linked inhibitor of apoptosis protein expression.Mol Cancer Ther 7, no. 1 (January 2008): 38–47. https://doi.org/10.1158/1535-7163.MCT-07-0370.
Aird KM, Ding X, Baras A, Wei J, Morse MA, Clay T, et al. Trastuzumab signaling in ErbB2-overexpressing inflammatory breast cancer correlates with X-linked inhibitor of apoptosis protein expression. Mol Cancer Ther. 2008 Jan;7(1):38–47.
Aird, Katherine M., et al. “Trastuzumab signaling in ErbB2-overexpressing inflammatory breast cancer correlates with X-linked inhibitor of apoptosis protein expression.Mol Cancer Ther, vol. 7, no. 1, Jan. 2008, pp. 38–47. Pubmed, doi:10.1158/1535-7163.MCT-07-0370.
Aird KM, Ding X, Baras A, Wei J, Morse MA, Clay T, Lyerly HK, Devi GR. Trastuzumab signaling in ErbB2-overexpressing inflammatory breast cancer correlates with X-linked inhibitor of apoptosis protein expression. Mol Cancer Ther. 2008 Jan;7(1):38–47.

Published In

Mol Cancer Ther

DOI

ISSN

1535-7163

Publication Date

January 2008

Volume

7

Issue

1

Start / End Page

38 / 47

Location

United States

Related Subject Headings

  • X-Linked Inhibitor of Apoptosis Protein
  • Up-Regulation
  • Trastuzumab
  • Transgenes
  • Signal Transduction
  • Receptor, erbB-2
  • Receptor, ErbB-2
  • RNA, Small Interfering
  • Oncology & Carcinogenesis
  • Neuronal Apoptosis-Inhibitory Protein