{"refrec":{"BRefID":337535,"RR":"<b>Delgado-Roche, L.; Gonzalez, K.; Mesta, F.; Couder, B.; Tavarez, Z.; Zavala, R.; Hernandez, I.; Garrido, G.; Rodeiro, I.; Vanden Berghe, W.</b> (2020). Polyphenolic fraction obtained from <i>Thalassia testudinum</i> marine plant and thalassiolin B exert cytotoxic effects in colorectal cancer cells and arrest tumor progression in a xenograft mouse model. <i>Front. Pharmacol. 11</i>: 592985. <a href=\"https://hdl.handle.net/10.3389/fphar.2020.592985\" target=\"_blank\">https://hdl.handle.net/10.3389/fphar.2020.592985</a>","BEntID":334158,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Front. Pharmacol. 11</i>: 592985. <a href=\"https://hdl.handle.net/10.3389/fphar.2020.592985\" target=\"_blank\">https://hdl.handle.net/10.3389/fphar.2020.592985</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Delgado-Roche, L.; Gonzalez, K.; Mesta, F.; Couder, B.; Tavarez, Z.; Zavala, R.; Hernandez, I.; Garrido, G.; Rodeiro, I.; Vanden Berghe, W.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Delgado-Roche, L. <i>et al.</i>","Englishabstract":"Marine plants are important sources of pharmacologically active metabolites. The aim of the present work was to evaluate the cytotoxic and antitumor activity of a polyphenolic fraction obtained from <em>Thalassia testudinum</em> marine plant and thalassiolin B in human colorectal cancer cells. Human cancer cell lines, including HCT15, HCT116, SW260, and HT29 were treated with tested products for cytotoxicity evaluation by crystal violet assay. The potential proapoptotic effect of these natural products was assessed by flow cytometry in HCT15 cells at 48&nbsp;h using Annexin V-FITC/propidium iodide. In addition, reactive oxygen species (ROS) generation was measured by fluorescence using DCFH-DA staining, and sulfhydryl concentration by spectrophotometry. The <em>in vivo</em> antitumor activity of the polyphenolic fraction (25&nbsp;mg/kg) was evaluated in a xenograft model in nu/nu mice. <em>In vivo</em> proapoptotic effect was also evaluated by immunohistochemistry using anti-caspase 3 and anti-Bcl-2 antibodies. The results showed that tested products exert colorectal cancer cell cytotoxicity. Besides, the tested products induced a significant increase (<em>p</em> &lt; 0.05) of intracellular ROS generation, and a depletion of sulfhydryl concentration in HCT15 cells. The polyphenolic fraction arrested tumor growth and induced apoptosis in the xenograft mice model. These results demonstrate the cytotoxic activity of <em>T. testudinum</em> metabolites associated, at least, with ROS overproduction and pro-apoptotic effects. Here we demonstrated for the first time the antitumor activity of a <em>T. testudinum</em> polar extract in a xenograft mice model. 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