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Antitumor and Angiostatic Activities of the Antimicrobial Peptide Dermaseptin B2

机译:抗菌肽蛙皮抗菌肽B2的抗肿瘤血管生成和活动

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摘要

Recently, we have found that the skin secretions of the Amazonian tree frog Phyllomedusa bicolor contains molecules with antitumor and angiostatic activities and identified one of them as the antimicrobial peptide dermaseptin (Drs) B2. In the present study we further explored the in vitro and in vivo antitumor activity of this molecule and investigated its mechanism of action. We showed that Drs B2 inhibits the proliferation and colony formation of various human tumor cell types, and the proliferation and capillary formation of endothelial cells in vitro. Furthermore, Drs B2 inhibited tumor growth of the human prostate adenocarcinoma cell line PC3 in a xenograft model in vivo. Research on the mechanism of action of Drs B2 on tumor PC3 cells demonstrated a rapid increasing amount of cytosolic lactate dehydrogenase, no activation of caspase-3, and no changes in mitochondrial membrane potential. Confocal microscopy analysis revealed that Drs B2 can interact with the tumor cell surface, aggregate and penetrate the cells. These data together indicate that Drs B2 does not act by apoptosis but possibly by necrosis. In conclusion, Drs B2 could be considered as an interesting and promising pharmacological and therapeutic leader molecule for the treatment of cancer.
机译:最近,我们发现亚马逊雨蛙Phyllomedusa bicolor的皮肤分泌物中含有具有抗肿瘤和血管抑制活性的分子,并将其中之一鉴定为抗菌肽dermaseptin(Drs)B2。在本研究中,我们进一步探索了该分子的体外和体内抗肿瘤活性,并研究了其作用机理。我们表明博士B2抑制各种人类肿瘤细胞类型的增殖和集落形成,以及体外内皮细胞的增殖和毛细血管形成。此外,在体内异种移植模型中,博士B2抑制人前列腺腺癌细胞系PC3的肿瘤生长。 Drs B2对肿瘤PC3细胞作用机理的研究表明,胞浆乳酸脱氢酶的量迅速增加,caspase-3没有激活,线粒体膜电位没有变化。共聚焦显微镜分析显示,Dr B2可以与肿瘤细胞表面相互作用,聚集并穿透细胞。这些数据一起表明,Drs B2不是通过凋亡起作用,而是可能通过坏死起作用。总之,B2博士被认为是治疗癌症的有趣且有希望的药理和治疗先导分子。

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