RESUMO
RNA targeting the murine vascular endothelial growth factor receptor 2 (VEGFR2) gene was designed and validated for efficient and robust silencing in vitro and was delivered by polyethylenimines (PEI) in vivo to investigate the antitumor effect on non-small cell lung cancer (NSCLC) xenografts. The following dosage regimens were tested for their tumor inhibitory effect in vivo: VEGFR2 siRNA, epidermal growth factor receptor (EGFR) siRNA, VEGFR2 siRNA+EGFR siRNA, cisplatin alone and VEGFR2 siRNA+ EGFR siRNA+cisplatin. Targeted silencing of both VEGFR2 and EGFR expression by siRNA, combined with low-dose cisplatin, was found to effectively inhibit tumor growth and extend the survival time of mice bearing the NSCLC xenografts. These results suggest that combination therapy using siRNAs and chemotherapy agents might offer a novel strategy for cancer treatment in the future.
Assuntos
Apoptose , Carcinoma Pulmonar de Células não Pequenas/patologia , Cisplatino/farmacologia , Receptores ErbB/antagonistas & inibidores , Neoplasias Pulmonares/patologia , RNA Interferente Pequeno/genética , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/antagonistas & inibidores , Animais , Antineoplásicos/farmacologia , Western Blotting , Carcinoma Pulmonar de Células não Pequenas/metabolismo , Carcinoma Pulmonar de Células não Pequenas/terapia , Proliferação de Células , Terapia Combinada , Receptores ErbB/genética , Receptores ErbB/metabolismo , Humanos , Neoplasias Pulmonares/metabolismo , Neoplasias Pulmonares/terapia , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Nus , RNA Mensageiro/genética , Reação em Cadeia da Polimerase em Tempo Real , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Células Tumorais Cultivadas , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/genética , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/metabolismoRESUMO
OBJECTIVE: To establish a method for analyzing the content of total polyphenols in leaves of Jatropha curcas. L. METHODS: Gallic acid was used as reference substance, the content of total polyphenols was analyzed Folin-Ciocalteu chromatometry. RESULTS: There was a good linearity for gallic acid in the range of 0.002-0.010 g.L(-1). The content of total polyphenols in the leaves of Jatropha curcas. L was approximately 6.74% with RSD 0.75%. The sample solution was stable during 10-90 min with RSD 0.28%. The precision RSD was 0.23% and the average recovery 99.85% (n=5). CONCLUSION: This method is simple, fast and reproducible.