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Molecular Cancer Therapeutics
Molecular Cancer Therapeutics
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Inhibition of c-Src expression and activation in malignant pleural mesothelioma tissues leads to apoptosis, cell cycle arrest, and decreased migration and invasion

Anne S. Tsao, Dandan He, Babita Saigal, Suyu Liu, J. Jack Lee, Srinivasa Bakkannagari, Nelson G. Ordonez, Waun Ki Hong, Ignacio Wistuba and Faye M. Johnson
Anne S. Tsao
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Dandan He
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Babita Saigal
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Suyu Liu
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J. Jack Lee
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Srinivasa Bakkannagari
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Nelson G. Ordonez
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Waun Ki Hong
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Ignacio Wistuba
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Faye M. Johnson
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DOI: 10.1158/1535-7163.MCT-07-0052 Published July 2007
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Abstract

Malignant pleural mesothelioma (MPM) is a deadly disease with few systemic treatment options. One potential therapeutic target, the non–receptor tyrosine kinase c-Src, causes changes in proliferation, motility, invasion, survival, and angiogenesis in cancer cells and may be a valid therapeutic target in MPM. To test this hypothesis, we determined the effects of c-Src inhibition in MPM cell lines and examined c-Src expression and activation in tissue samples. We analyzed four MPM cell lines and found that all expressed total and activated c-Src. Three of the four cell lines were sensitive by in vitro cytotoxicity assays to the c-Src inhibitor dasatinib, which led to cell cycle arrest and increased apoptosis. Dasatinib also inhibited migration and invasion independent of the cytotoxic effects, and led to the rapid and durable inhibition of c-Src and its downstream pathways. We used immunohistochemical analysis to determine the levels of c-Src expression and activation in 46 archived MPM tumor specimens. The Src protein was highly expressed in tumor cells, but expression did not correlate with survival. However, expression of activated Src (p-Src Y419) on the tumor cell membrane was higher in patients with advanced-stage disease; the presence of metastasis correlated with higher membrane (P = 0.03) and cytoplasmic (P = 0.04) expression of p-Src Y419. Lower levels of membrane expression of inactive c-Src (p-Src Y530) correlated with advanced N stage (P = 0.02). Activated c-Src may play a role in survival, metastasis, and invasion of MPM, and targeting c-Src may be an important therapeutic strategy. [Mol Cancer Ther 2007;6(7):1962–72]

Keywords:
  • malignant pleural mesothelioma
  • Src kinase
  • dasatinib
  • cytotoxicity

Footnotes

  • ↵5 Johnson FM, Saigal B, Tran HT, Donato NJ. Abrogation of STAT3 reactivation after Src kinase inhibition results in synergistic antitumor effects. Clin Cancer Res. In press, 2007.

  • The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

    • Accepted May 25, 2007.
    • Received January 24, 2007.
    • Revision received April 11, 2007.
  • American Association for Cancer Research
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Molecular Cancer Therapeutics: 6 (7)
July 2007
Volume 6, Issue 7
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Inhibition of c-Src expression and activation in malignant pleural mesothelioma tissues leads to apoptosis, cell cycle arrest, and decreased migration and invasion
Anne S. Tsao, Dandan He, Babita Saigal, Suyu Liu, J. Jack Lee, Srinivasa Bakkannagari, Nelson G. Ordonez, Waun Ki Hong, Ignacio Wistuba and Faye M. Johnson
Mol Cancer Ther July 1 2007 (6) (7) 1962-1972; DOI: 10.1158/1535-7163.MCT-07-0052

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Inhibition of c-Src expression and activation in malignant pleural mesothelioma tissues leads to apoptosis, cell cycle arrest, and decreased migration and invasion
Anne S. Tsao, Dandan He, Babita Saigal, Suyu Liu, J. Jack Lee, Srinivasa Bakkannagari, Nelson G. Ordonez, Waun Ki Hong, Ignacio Wistuba and Faye M. Johnson
Mol Cancer Ther July 1 2007 (6) (7) 1962-1972; DOI: 10.1158/1535-7163.MCT-07-0052
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Molecular Cancer Therapeutics
eISSN: 1538-8514
ISSN: 1535-7163

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