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- Title
Inhibition of Breast Cancer Metastases by a Novel Inhibitor of TGFβ Receptor 1.
- Authors
Yuanzhang Fang; Yihua Chen; Linxi Yu; Cong Zheng; Ya Qi; Zhenxi Li; Zhengfeng Yang; Yong Zhang; Tieliu Shi; Jian Luo; Mingyao Liu
- Abstract
Background Transforming growth factor beta (TGFβ), which is implicated in metastasis to various organs in breast cancer, is a potential target for new antitumor metastasis drugs. Methods To identify specific inhibitors of TGFβ receptor 1 (TGFβR1) in breast cancer metastasis, a virtual library of more than 400000 different compounds was screened by molecular docking modeling and confirmed with Smad-binding element luciferase and TGFβR1 kinase assays. Affymetrix GeneChip expression analysis of mRNA levels and real-time polymerase chain reaction were performed to determine expression changes of TGFβ-mediated, metastasis-associated genes in breast cancer cells after treatment with the small-molecule inhibitorYR-290.YR-290 was also examined for its effects on breast cancer migration, invasion, and metastasis using transwell and epithelial-to-mesenchymal transition (EMT) assays in vitro and three different mouse (BALB/c and NU/NU nude) models (n = 10 per group). Kaplan-Meier analyses were used to assess survival. All statistical tests were two-sided. Results YR-290 interacted with the kinase domain of TGFβR1, abrogated kinase activity (half maximal inhibitory concentration = 137 nM, 95% confidence interval = 126.4 to 147.6 nM) and inhibited theTGFβ-mediated downstream signaling pathway and metastasis-associated genes in breast cancer cells. YR-290 inhibited TGFβ-modulated breast cancer cell migration and invasion. In tumor metastasis mouse models, YR-290 almost completely blocked cancer metastasis. Numbers of lung tumor nodules of mice treated with 1mg/kg and 5mg/kg YR-290 were reduced by 74.93% (95% confidence interval = 61.45% to 88.41%) and 94.93% (95% confidence interval = 82.13% to 100%), respectively, compared with control mice. Treatment with YR-290 also statistically significantly prolonged the survival of tumor-bearing mice. Conclusions YR-290 is a novel inhibitor of tumor metastasis that works by blocking TGFβ signaling pathways.
- Subjects
BREAST cancer research; CANCER invasiveness; METASTASIS; TRANSFORMING growth factors-beta; POLYMERASE chain reaction
- Publication
JNCI: Journal of the National Cancer Institute, 2013, Vol 105, Issue 1, p47
- ISSN
0027-8874
- Publication type
Article
- DOI
10.1093/jnci/djs485