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Journal Article
Research Support, Non-U.S. Gov't
Inhibition of bladder cancer growth with homoharringtonine by inactivating integrin α5/β1-FAK/Src axis: A novel strategy for drug application.
Pharmacological Research : the Official Journal of the Italian Pharmacological Society 2023 Februrary
The application of immune checkpoint inhibitors and FGFR protein tyrosine kinase inhibitors have made a tremendous breakthrough in bladder cancer therapy. However, inadequate drug responses and drug resistance interfere with successful treatment outcomes. For a new drug to enter the market, there is a long development cycle with high costs and low success rates. Repurposing previously Food and Drug Administration (FDA)-approved medications and using novel drug discovery strategies may be an optimal approach. Homoharringtonine (HHT) has been used for hematologic malignancies for over 40 years in China and was approved by the FDA approximately 10 years ago. Many studies have demonstrated that HHT effectively inhibits the development of several types of solid tumors, although the underlying mechanisms of action are unclear. In this study, we investigated the mechanisms underlying HHT activity against bladder cancer growth. We first compared HTT with the drugs currently used clinically for bladder cancer treatment. HHT showed stronger inhibitory activity than cisplatin, carboplatin, and doxorubicin. Our in vitro and in vivo data demonstrated that HHT inhibited proliferation, colony formation, migration, and cell adhesion of bladder cancer cells and induced apoptosis and cell cycle arrest in the nanomolar concentration range. Furthermore, we revealed that HHT treatment could downregulate the MAPK/Erk and PI3k/Akt signaling pathways by inactivating the integrin α5/β1-FAK/Src axis. HHT-induced activity reduced cell-ECM interactions and cell migration, thus suppressing tumor metastasis progression. Altogether, HHT shows enormous potential as an anticancer agent and may be applied as a combination treatment strategy for bladder cancer.
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