ObjectiveTo observe the effects of hydroxysafflor yellow A (HSYA) on microvessel density (MVD) of mice transplanted Lewis lung cancer and mRNA expression of vascular endothelial growth factor (VEGF) so as to explore the tumor-inhibiting mechanism of HSYA. MethodsSixty tumor-bearing C57/BL mice were randomly divided into five groups, with 12 mice in each group, namely a control group, a cyclophosphamide (CTX) group (25mg/kg), a large dose HSYA group (112mg/L), a medium dose HSYA group (56mg/L), and a small dose HSYA group (28mg/L). These different drugs were administered by intraperitoneal injection. The mice were sacrificed 22 days after the treatment. Tumor tissues were sampled and examined by immunohistochemical method and quantitative real-time PCR to detect the expression of MVD and VEGF mRNA. ResultsThe MVD of the medium and small dose HSYA groups and CTX group were 30.01±3.12, 22.56±2.11 and 16.21±2.40, respectively, which were significantly lower than 41.10±2.93 of the control group and 37.66±3.04 of the large dose HSYA group (χ2=2.82, P=0.010;χ2=3.16, P=0.007;χ2=4.58, P=0.000) and (χ2=1.98, χ2=0.038;χ2=2.45, P=0.016;χ2=3.82, P=0.001). The difference in VEGF amplified fluorescence expression threshold between the HSYA groups and the control group was not significant. However, after amplification, the expression of VEGF mRNA in the small dose HSYA group was only 0.43±0.16, which was obviously lower than 0.82±0.06 in the control group (F=0.77, P=0.038). ConclusionHSYA can significantly reduce MVD in mice transplanted Lewis lung cancer and down-regulate expression of VEGF mRNA to achieve tumor-inhibiting effect.
目的:探討人凋亡相關新基因PNAS-4(hPNAS-4)基因通過脂質體轉染至Lewis肺癌LL2細胞后對放射治療的增敏作用。〖HTH〗方法〖HTSS〗:用脂質體介導的轉染技術,將hPNAS-4基因導入Lewis肺癌LL2細胞中,Western blot鑒定其過表達后,觀察X射線照射對其集落形成的影響;流式細胞儀檢測hPNAS-4基因或／和放療(0,1,2,4,6 Gy)對LL2細胞生長抑制及凋亡的影響。〖HTH〗結果〖HTSS〗:通過Western blot證實了hPNAS-4基因在LL2細胞中的過表達。Lip-hPNAS-4加放射治療處理組細胞的生存能力明顯降低,腫瘤細胞的克隆形成明顯減少,流式細胞術檢測體外培養的腫瘤細胞凋亡明顯增加。〖HTH〗結論〖HTSS〗:hPNAS-4基因聯合放射治療能產生協同抗腫瘤效應。