期刊
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
卷 533, 期 4, 页码 672-678出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2020.09.143
关键词
Akt/mTOR pathway; Dasatinib; Intrinsic resistance; Triple-negative breast cancer
资金
- Japan Society for the Promotion of Science [18J21507, 19K19409, 17H04724]
- Health Labor Sciences Research Grant from the Ministry of Health, Labor, andWelfare of Japan [H30-syokuhin-wakate-002]
Currently, the only therapeutic choice for the treatment of triple-negative breast cancer (TNBC) is chemotherapy. In TNBC, despite strong preclinical data, clinical trials of molecular targeted drugs, such as the Src tyrosine kinase inhibitor dasatinib, have failed because of the heterogeneity of TNBC cells. Here, we examined the mechanism of intrinsic resistance to dasatinib in five TNBC cell lines. First, we divided the TNBC cell lines into those sensitive or resistant to dasatinib and found that activation of Src was inhibited in all of the cell lines. In contrast, we found that dasatinib inhibited Akt phosphorylation in only the dasatinib-sensitive cell lines. Consequently, we found that combination treatment with dasatinib and an inhibitor of Akt or mTOR suppressed cell proliferation more than did either monotherapy in the dasatinib-resistant cell lines. Finally, to mimic intrinsic resistance, we established a dasatinib-tolerant TNBC cell line. In this cell line, the combinational effect of Akt/mTOR inhibition with dasatinib was observed, as it was in the cell lines with intrinsic resistance. Together, the present results show that the effect of dasatinib in TNBC is independent of Src inhibition, and that Akt/mTOR inhibition might be an effective strategy to overcome TNBC cells with intrinsic dasatinib resistance. (C) 2020 The Authors. Published by Elsevier Inc.
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