摘要
目的 探讨新型含硒化合物BBSKE(1,2 [二 (1,2 苯并异硒唑 3(2H) 酮 ) ]乙烷 )对PC 3前列腺癌细胞的增殖及凋亡的影响 ,观察其对小鼠前列腺癌的体内抑瘤作用。方法 培养PC 3前列腺癌细胞 ,用MTT法检测了不同浓度的BBSKE对其增殖的影响 ,用荧光显微镜、DNA电泳和流式细胞仪观察BBSKE对细胞凋亡的诱导作用 ,并检测BBSKE对PC 3细胞bcl 2和bax蛋白表达水平及半胱氨蛋白水解酶 3活性的影响。用TRAMP C2小鼠前列腺癌细胞皮下注射C5 7BL/ 6小鼠 ,建立小鼠前列腺癌模型 ,观察BBSKE在小鼠体内的抗前列腺癌作用。结果 BBSKE可以显著抑制PC 3细胞的体外增殖 ,其 4 8h的IC50 值为 17 90 μmol/L ,而阳性对照组顺铂为 15 0 μmol/L。同时BBSKE可以诱导PC 3细胞凋亡 ,2 0 μmol/L的BBSKE作用PC 3细胞 4 8h凋亡发生率达 2 6 32 % ,显著高于未经处理的对照组的 1 75 % (P <0 0 1)。细胞中bcl 2表达减低 ,bax表达无明显变化 ,半胱氨蛋白水解酶 3活性显著增高。动物实验也表明其对小鼠体内前列腺癌的生长有抑制作用 ,抑瘤率达 4 0 % ,顺铂对照组为 4 8%。结论 新型含硒化合物BBSKE可以抑制PC 3细胞增殖并促进其凋亡 ,其作用可能是通过降低细胞内的bcl 2 ,增加半胱氨蛋白水解酶 3活性而实现的 ;
Objective To investigate the effects of BBSKE (1,2-[bis (1,2-benzisoselenazolone-3 (2H)-ketone)]ethane), a novel organoselenium compound, on the proliferation and apoptosis of the prostate cancer cell line PC-3, and to study its effect on the growth of prostate cancer in vivo. Methods Prostate cancer cells of the cell line PC-3 was cultivated in media with different concentrations of BBSKE and cisplatin. The inhibition of proliferation was measured by colorimetric MTT assay. The morphologic changes were oberserved by fluorescence microscopy, DNA fragmentation was visualized by agarose gel electrophoresis, and the DNA degradation was determined by flow cytometry. Western blot analysis was used to identify the expression of bcl-2 and bax. The activity of caspase-3 was determined by a micro-ELISA reader. Mouse prostate cancer cells of the TRAMP-C2 line were cultured and then injected subcutaneously into 2 male C57BL/6 mice to establish the animal model. Then the 2 mice were killed to collect the cancer cells. Twenty-four mice were injected intraperitoneally with single cell suspension of TRAMP-C2 cell and then divided into 3 groups of 8 mice undergoing intraperitoneal injection for 7 days: BBSKE group (BBSKE was administered at the dosage of 25mg/kg/day), cisplatin group (cisplatin 2mg/kg/d was injected), and control group (pure solvent was injected). Three weeks after the mice were killed and the tumors were taken out to calculate the inhibition rate. Results BBSKE inhibited the growth of the PC-3 cells dosage-dependently with a value of IC 50 of 17.90 μmol/L after a 48 h exposure, higher than that in the case of cisplatin (15.00 μmol/L). After exposure of PC-3 cells to BBSKE at the dosage of 20 μmol/L for 48 hours the apoptosis rate was 26.32%, significantly higher than that of the control group (1.75%, P<0.01). The expression of bcl-2 was decreased and the expression of bax remained almost unchanged along with the increase of BBSKE concentration. The activity of caspase 3 in the subgroup of BBSKE of the concentration of 5 μmol/L remained almost unchanged, and was increased to 3.65±0.57 and 4.39±1.01 respectively in the BBSKE 10 μmol/L and 20 μmol/L subgroups, both significantly higher than that of the control group (both P<0.05) . In the in vivo experiment, the growth of tumor was significantly inhibited by BBSKE with an inhibition rate of 40% and the inhibition rate of the cisplatin group was 48%. Conclusion The novel organoselenium BBSKE inhibits the proliferation of PC-3 cell and promote its apoptosis, probably through downregulating the expression of bcl-2 and the activity of caspase-3. BBSKE also inhibits the growth of prostate cancer in vivo.
出处
《中华医学杂志》
CAS
CSCD
北大核心
2003年第22期1984-1988,共5页
National Medical Journal of China
基金
北京市自然科学基金重点资助项目 ( 70 2 10 0 1)
