目的观察鬼针草总黄酮(totalflavones of Bidenspilo-saL,TFB)对肝纤维化大鼠细胞因子的影响。方法将大鼠随机分成正常组、对照组、TFB160、80、40mg·kg-1组和秋水仙碱(Col)0.1mg·kg-1阳性药对照组。除正常组外,其余各组采用...目的观察鬼针草总黄酮(totalflavones of Bidenspilo-saL,TFB)对肝纤维化大鼠细胞因子的影响。方法将大鼠随机分成正常组、对照组、TFB160、80、40mg·kg-1组和秋水仙碱(Col)0.1mg·kg-1阳性药对照组。除正常组外,其余各组采用四氯化碳(CCl4)诱导肝纤维化模型。于造模wk9起,给药组分别灌胃相应的受试药物,正常组和对照组灌胃等容量的生理盐水,疗程10wk。实验结束后,股动脉采血,放免法测定血清中肿瘤坏死因子-α(TNF-α)和白细胞介素-1β(IL-1β)的含量,同时取固定部位肝脏组织,免疫组化技术测定TFB对肝组织中TGF-β1和NF-κB蛋白表达的影响,RT-PCR技术测定TFB对肝组织中TGF-β1 mRNA表达的影响。结果TFB160、80mg·kg-1能明显降低肝纤维化大鼠血清TNF-α、IL-1β含量,抑制肝纤维化大鼠肝组织中NF-κB、TGF-β1蛋白和TGF-β1 mRNA表达。结论TFB通过降低肝纤维化大鼠炎症细胞因子而抗肝纤维化。展开更多
Hypoxia and transforming growth factor-β1 （TGF-β1） increase vascular endothelial growth factor A （VEGFA） expression in a number of malignancies. This effect of hypoxia and TGF-β1 might be responsible for tumor ...Hypoxia and transforming growth factor-β1 （TGF-β1） increase vascular endothelial growth factor A （VEGFA） expression in a number of malignancies. This effect of hypoxia and TGF-β1 might be responsible for tumor progression and metastasis of advanced prostate cancer. In the present study, TGF-β1 was shown to induce VEGFA165 secretion from both normal cell lines （HPV7 and RWPE1） and prostate cancer cell lines （DU 145 and PC3）. Conversely, hypoxia-stimulated VEGFA165 secretion was observed only in prostate cancer cell lines. Hypoxia induced TGF-β1 expression in PC3 prostate cancer cells, and the TGF-β1 type I receptor （ALK5） kinase inhibitor partially blocked hypoxia-mediated VEGFA16s secretion. This effect of hypoxia provides a novel mechanism to increase VEGFA expression in prostate cancer cells. Although autocrine signaling of VEGFA has been implicated in prostate cancer progression and metastasis, the associated mechanism is poorly characterized. VEGFA activity is mediated via VEGF receptor （VEGFR） 1 （Fit-l） and 2 （FIk-I/KDR）. Whereas VEGFR-1 mRNA was detected in normal prostate epithelial cells, VEGFR-2 mRNA and VEGFR protein were expressed only in PC3 cells. VEGFA165 treatment induced phosphorylation of extracellular signal-regulated kinase 1/2 （ERKI/2） in PC3 cells but not in HPV7 cells, suggesting that the autocrine function of VEGFA may be uniquely associated with prostate cancer. Activation of VEGFR-2 by VEGFA165 was shown to enhance migration of PC3 cells. A similar effect was also observed with endogenous VEGFA induced by TGF-β1 and hypoxia. These findings illustrate that an autocrine loop of VEGFA via VEGFR-2 is critical for the tumorigenic effects of TGF-β1 and hypoxia on metastatic prostate cancers.展开更多
文摘目的观察鬼针草总黄酮(totalflavones of Bidenspilo-saL,TFB)对肝纤维化大鼠细胞因子的影响。方法将大鼠随机分成正常组、对照组、TFB160、80、40mg·kg-1组和秋水仙碱(Col)0.1mg·kg-1阳性药对照组。除正常组外,其余各组采用四氯化碳(CCl4)诱导肝纤维化模型。于造模wk9起,给药组分别灌胃相应的受试药物,正常组和对照组灌胃等容量的生理盐水,疗程10wk。实验结束后,股动脉采血,放免法测定血清中肿瘤坏死因子-α(TNF-α)和白细胞介素-1β(IL-1β)的含量,同时取固定部位肝脏组织,免疫组化技术测定TFB对肝组织中TGF-β1和NF-κB蛋白表达的影响,RT-PCR技术测定TFB对肝组织中TGF-β1 mRNA表达的影响。结果TFB160、80mg·kg-1能明显降低肝纤维化大鼠血清TNF-α、IL-1β含量,抑制肝纤维化大鼠肝组织中NF-κB、TGF-β1蛋白和TGF-β1 mRNA表达。结论TFB通过降低肝纤维化大鼠炎症细胞因子而抗肝纤维化。
文摘Hypoxia and transforming growth factor-β1 （TGF-β1） increase vascular endothelial growth factor A （VEGFA） expression in a number of malignancies. This effect of hypoxia and TGF-β1 might be responsible for tumor progression and metastasis of advanced prostate cancer. In the present study, TGF-β1 was shown to induce VEGFA165 secretion from both normal cell lines （HPV7 and RWPE1） and prostate cancer cell lines （DU 145 and PC3）. Conversely, hypoxia-stimulated VEGFA165 secretion was observed only in prostate cancer cell lines. Hypoxia induced TGF-β1 expression in PC3 prostate cancer cells, and the TGF-β1 type I receptor （ALK5） kinase inhibitor partially blocked hypoxia-mediated VEGFA16s secretion. This effect of hypoxia provides a novel mechanism to increase VEGFA expression in prostate cancer cells. Although autocrine signaling of VEGFA has been implicated in prostate cancer progression and metastasis, the associated mechanism is poorly characterized. VEGFA activity is mediated via VEGF receptor （VEGFR） 1 （Fit-l） and 2 （FIk-I/KDR）. Whereas VEGFR-1 mRNA was detected in normal prostate epithelial cells, VEGFR-2 mRNA and VEGFR protein were expressed only in PC3 cells. VEGFA165 treatment induced phosphorylation of extracellular signal-regulated kinase 1/2 （ERKI/2） in PC3 cells but not in HPV7 cells, suggesting that the autocrine function of VEGFA may be uniquely associated with prostate cancer. Activation of VEGFR-2 by VEGFA165 was shown to enhance migration of PC3 cells. A similar effect was also observed with endogenous VEGFA induced by TGF-β1 and hypoxia. These findings illustrate that an autocrine loop of VEGFA via VEGFR-2 is critical for the tumorigenic effects of TGF-β1 and hypoxia on metastatic prostate cancers.
