20(R)-人参皂甙Rg3对大鼠肝癌细胞的作用

目的　探讨人参皂甙 Rg3对大鼠诱发性肝癌的作用及其机制。方法　建立 SD大鼠诱发性肝癌模型 ,经肿瘤供血动脉灌注不同剂量的 2 0 (R) -人参皂甙 Rg3(0 .375、1.5、6 .0 mg/ kg) ,磁共振成像 (MRI)技术测量治疗前、后肿瘤的体积变化 ,流式细胞仪 (FCM)和免疫组织化学方法检测肿瘤细胞的凋亡、增殖及坏死情况。结果　高剂量组对肿瘤体积的影响与对照组比较 ,其差异具有显著性 (P<0 .0 5 ) ;低、中、高三个治疗组诱导大鼠肝癌细胞的平均凋亡率 (% )分别为 11.0 8± 3.78、13.5 7± 3.34和 2 7.35± 16 .0 4 ,高剂量组较其它组差异显著 ;用药后测得 S期细胞的平均比率 (% )分别为 2 3.98± 9.4 4、19.73± 6 .6 2和 14 .0 9± 3.4 8,治疗组与对照组相比均有显著性差异 ,且药物剂量与其对肿瘤细胞的抑制作用呈正相关。高剂量组中增殖细胞核抗原 (PCNA)与肿瘤坏死因子 (TNF)的表达与对照组相比差异有显著性 ;治疗组组间 PCNA与 TNF的表达差异不显著。结论　经肿瘤供血动脉灌注人参皂甙 Rg3能明显的抑制肿瘤细胞增殖、有效的诱导肿瘤细胞凋亡、促进肿瘤组织坏死 ,并有剂量依赖性。

Anticarcinogenic Effect of 20(R)-ginsenoside Rg3 on Induced Hepatocellular Carcinoma in Rats

OBJECTIVE: To explore the anticarcinogenic mechanism of 20(R)-ginsenoside Rg3 in induced liver tumor in SD rat. METHODS: Thirty-five SD rats with induced hepatocellular carcinoma were divided into a control group and 3 dosage groups according to the dosing levels of 20(R)-ginsenoside Rg3. The tumour volume was measured by MR imaging. The apoptotic rat and S-phase fraction and diploid of tumor cell were measured with flow cytometry. Protein expression of PCNA and TNF were evaluated with immunohistochemistry. RESULTS: There was significant difference in tumour volume between the high dosage group and the control group. The average apoptotic rates were 11.08+/-3.78, 13.57+/-3.34, 27.35+/-16.04 and the S-phase fractions were 23.98+/-9.44, 19.73+/-6.62, 14.09+/-3.48 in the low-, medium-, and high-dosage groups respectively. The apoptotic rate was significantly higher in the high-dosage group than in the medium-dosage group and low-dosage group. Before-after comparison showed that the anti-proliferative effects of 20(R)-ginsenoside Rg3 were significant in three treatment groups. The higher positive rats of protein expression with PCNA and TNF were significant difference in the high-dosage group compared to those in the low-dosage group. No significant difference between the medium-dosage group and the low-dosage group. CONCLUSION: 20(R)-ginsenoside Rg3 can noticeably inhibit the proliferation of tumor cells, and efficaciously induce the apoptosis and facilitate necrosis of the tumor cells, and there appears to be a dose dependent effect.