摘要
目的 通过计算机虚拟筛选和细胞活性筛选,获得能靶向抑制肿瘤坏死因子β（TNFβ）的细胞毒活性的小分子抑制剂。方法 根据TNFβ与肿瘤坏死因子Ⅰ型受体（TNFR1）结合的复合晶体结构,采用计算机虚拟筛选方法初步选择对接结果较好的105个小分子化合物（C1~C105）,并对其进行细胞活性筛选;MTT法检测小分子化合物抑制TNFβ对L929细胞的细胞毒性;流式细胞术测定小分子化合物对TNFβ引起的细胞凋亡的抑制作用;采用碘化丙啶（PI）单染和流式分析技术检测小分子化合物对L929细胞周期的影响;采用Western blot和双转盘激光共聚焦显微镜分析小分子化合物对TNFβ引起的下游Caspase 3活化的抑制作用。结果 C35能有效抑制TNFβ引起的细胞毒作用,且这种抑制作用呈现剂量依赖性（半数抑制浓度=8.19μmol/L）;C35具有较低的细胞毒性,且对L929细胞周期无影响;C35能阻断TNFβ与其受体结合后引起的细胞凋亡通路,显著抑制TNFβ引起的L929细胞凋亡。结论 成功筛选到一个TNFβ小分子抑制剂C35,其能阻断TNFβ引起的细胞凋亡通路,高效抑制TNFβ的细胞毒活性。
Objective To explore a novel and highly specific small-molecule TNFβinhibitor by using computer-aided virtual screening and cell-based assays in vitro. Methods Computer-aided drug design and virtual screening were used to design and identify chemical compounds that targeted TNFβbased on the crystal structure of the TNFβ-TNFR1 complex. The effect of the small-molecule compound against TNFβ-induced cytotoxicity of L929 cells was detected by MTT assay, and the efficacy of the compound to inhibit TNFβ-induced apoptosis of L929 cells was determined by flow cytometry assay. The impact of the compound on L929 cell cycle was examined by Propidium Iodide （PI） staining and flow cytometry, and the influence of the compound on TNFβ-triggered signal pathway was analyzed by Western blot assay and Ultra VIEW VOX 3D Live Cell Imaging System. Results No.35 compound （named as C35 thereafter） could effectively inhibit TNFβ-induced cell death in a dose dependent manner, and the half-maximum inhibition concentration （IC50） was 8.19μmol/L. Furthermore, C35 had lower cytotoxicity and minimal effect on L929 proliferation. Here we further revealed that C35 could affect TNFβ-induced apoptotic pathway by blocking the activation of Caspase 3, and markedly reduce L929 cell apoptosis induced by TNFβ. Conclusion A novel TNFβsmall-molecule inhibitor was identified by combining computer-aided virtual screening with functional assays, and which could block TNFβ-triggered apoptotic pathway and efficiently inhibit the cell death induced by TNFβ.
出处
《天津医药》
CAS
2015年第9期961-964,I0001,共5页
Tianjin Medical Journal
基金
国家自然科学基金资助项目(31271484
31471116)
天津市自然科学基金重点基金(12JCZDJC24600)
北京协和医学院研究生创新基金(100023-0710-1013)
