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Invest New Drugs
2021 Apr 01;392:377-385. doi: 10.1007/s10637-020-01008-y.
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rAj-Tspin, a novel recombinant peptide from Apostichopus japonicus, suppresses the proliferation, migration, and invasion of BEL-7402 cells via a mechanism associated with the ITGB1-FAK-AKT pathway.
Yu P, Wu R, Zhou Z, Zhang X, Wang R, Wang X, Lin S, Wang J, Lv L.
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Purpose Our study aimed to investigate the antitumor effects of rAj-Tspin on BEL-7402 hepatocellular carcinoma cells and to explore the underlying mechanism. Method For the in vivo experiment, BEL-7402 cells were inoculated subcutaneously into the axilla of nude mice to generate a BEL-7402 cell-bearing model, and model mice were then treated with different doses of rAj-Tspin. A CCK-8 assay was used to evaluate the in vitro viability of BEL-7402 and LO2 cells after treatment with different concentrations of rAj-Tspin. The effects of rAj-Tspin on BEL-7402 cell apoptosis, migration and invasion were evaluated by AO/EB and Hoechst fluorescent staining and by scratch and Transwell assays, and the tumor-suppressive mechanism of rAj-Tspin was explored by Western blotting. Results rAj-Tspin suppressed the proliferation of BEL-7402 cells with an IC50 of 0.89 μM. The results of both microscopic analysis and Western blotting suggested that rAj-Tspin induced the apoptosis of BEL-7402 cells through a mitochondria-dependent pathway. Furthermore, rAj-Tspin disrupted EMT; this disruption ultimately caused BEL-7402 cells to lose their shape and decreased their migration and invasion. Moreover, rAj-Tspin might inhibit the proliferation and metastasis of BEL-7402 cells through the ITGB1-FAK-AKT pathway. Conclusion rAj-Tspin exerts an antitumor effect through the ITGB1-FAK-Akt signaling pathway and exhibits low toxicity at an effective dose.
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