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A novel phytosterol isolated from Datura inoxia, RinoxiaB is a potential cure colon cancer agent by targeting BAX/Bcl2 pathway.
Bioorganic & Medicinal Chemistry ( IF 3.3 ) Pub Date : 2019-12-02 , DOI: 10.1016/j.bmc.2019.115242
Babu Gajendran 1 , Prabhu Durai 2 , Krishnapriya Madhu Varier 3 , Arulvasu Chinnasamy 2
Affiliation  

Plant sterols have been widely used as chemotherapeutic agents for colorectal cancer for years together. In this study, a novel phytosterol was isolated and characterized from the leaf extract of a medicinal plant, Datura inoxia and was coined as RinoxiaB (RB). This phytosterol was observed to have antiproliferative activity against human colon adenocarcinoma cells, HCT 15. The cell viability assay revealed the IC50 value of the RB as 4 µM. Moreover, RB treated cells showed prominent morphological changes dose dependently and progressively increased the number of dead cells. Additionally, results of the comet, flow cytometry, and cell cycle analysis revealed that the majority of cells were arrested in their S and G2/M phase by blocking the mitotic spindle formation. The western blot analysis (Bcl-2, BAX, Cytochrome C, Caspases 9 & 3) clearly indicated that RB has the ability to induce apoptosis by significantly upregulating (P < 0.05) Bcl-2 and causing mitochondrial damage leading to Cytochrome C release and activation of caspases, which subsequently results in downregulation of BAX expression in the cytosol. Furthermore, the expression of tumor suppressors (p53 and p21) and cell cycle regulatory proteins (Cyclins D1 & B1) suggested that RB inhibit cell proliferation. Thus, the present finding concludes that RB can offer possible apoptotic effects by targeting BAX/Bcl2 pathway in HCT 15 cells, thus alleviating colon cancer.

中文翻译:

RinoxiaB是从Datura inoxia分离出的一种新型植物固醇,它是通过靶向BAX / Bcl2途径而潜在治愈结肠癌的药物。

多年来,植物固醇已广泛用作结直肠癌的化学治疗剂。在这项研究中,从药用植物曼陀罗(Datura inoxia)的叶提取物中分离并表征了一种新型植物甾醇,并以RinoxiaB(RB)的名义制造。观察到该植物甾醇对人结肠腺癌细胞HCT 15具有抗增殖活性。细胞活力分析表明RB的IC50值为4 µM。而且,RB处理的细胞显示出显着的形态变化,其剂量依赖性并逐渐增加死细胞的数量。此外,彗星,流式细胞仪和细胞周期分析的结果表明,大多数细胞通过阻断有丝分裂纺锤体的形成而停留在S和G2 / M期。蛋白质印迹分析(Bcl-2,BAX,细胞色素C,Caspases 9和 3)清楚地表明RB具有通过显着上调(P <0.05)Bcl-2并引起线粒体损伤从而导致细胞色素C释放和胱天蛋白酶激活的方法来诱导细胞凋亡,随后导致细胞溶胶中BAX表达的下调。此外,肿瘤抑制因子(p53和p21)和细胞周期调节蛋白(Cyclins D1和B1)的表达提示RB抑制细胞增殖。因此,本发现得出结论,RB可以通过靶向HCT 15细胞中的BAX / Bcl2途径来提供可能的凋亡作用,从而减轻结肠癌。随后导致细胞质中BAX表达的下调。此外,肿瘤抑制因子(p53和p21)和细胞周期调节蛋白(Cyclins D1和B1)的表达提示RB抑制细胞增殖。因此,本发现得出结论,RB可以通过靶向HCT 15细胞中的BAX / Bcl2途径来提供可能的凋亡作用,从而减轻结肠癌。随后导致细胞质中BAX表达的下调。此外,肿瘤抑制因子(p53和p21)和细胞周期调节蛋白(Cyclins D1和B1)的表达提示RB抑制细胞增殖。因此,本发现得出结论,RB可以通过靶向HCT 15细胞中的BAX / Bcl2途径来提供可能的凋亡作用,从而减轻结肠癌。
更新日期:2019-12-02
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