RESUMO
The gene expressions of codeinone reductase (COR) and berberine bridge enzyme (BBE) in Papaver somniferum were blocked by RNA hairpin of RNA interference (RNAi). The complete sequences of COR and BBE genes were cloned by reverse transcription-polymerase chain reaction (RT-PCR), the results of homology comparison revealed that the cloned COR and BBE genes had high homology with the other gene family members reported in the GenBank. The target sequences of COR and BBE genes were screened in accordance with the design principle of RNAi, a 643 bp fusion gene was obtained by the method of overlapping PCR, then plant expression vector ihpRNA was constructed based on intermediate vector pHANNIBAL and plant expression vector pCEPSPS. With that 78 transgenic plants were obtained through Agrobacterium-mediated and 17 positive plants were screened by PCR, that could initially indicate that the target fragments of COR and BBE gene had been integrated into tobacco genome.
Assuntos
Fusão Gênica Artificial , Vetores Genéticos , Álcool Oxidorredutases Dependentes de NAD(+) e NADP(+) , Genética , Oxirredutases N-Desmetilantes , Genética , Papaver , Genética , Plantas Geneticamente Modificadas , Genética , Interferência de RNA , RNA Interferente Pequeno , Nicotiana , Genética , Transformação GenéticaRESUMO
Traditional medicines, in particular herbal products, have been used abundantly over the years in curing several diseases. Pharmacological interactions of herbal products with modern drugs, however, remain to some extent unknown. Herein, we examined whether co-administration of Faizol Ubat Batuk [FUB], a mixture of aqueous extract of different plants, modifies the metabolism of aminopyrine, a conventional analgesic drug, in rat liver. We used rat hepatocytes outfitted by collagenase perfusion technique. Determination of aminopyrine n-demethylase activity was performed using the Nash colorimetric method, by measuring the amount of formaldehyde produced. Compared to control treatment, FUB significantly increased the hepatic metabolism of aminopyrine in healthy adult male rats. In contrast, the hepatic metabolism of aminopyrine in adult female rats was decreased. Besides, a biphasic effect in n-demethylase activity was observed in young male rats treated with FUB. In a subsequent experiment, FUB did not change the metabolism of aminopyrine in streptozotocin [STZ]-diabetic adult male rats. In conclusion, administration of FUB could affect phase I aminopyrine metabolism in rat heptocytes. In addition, the effects of FUB on hepatic n-demethylase activity were gender and disease dependent
Assuntos
Masculino , Feminino , Animais de Laboratório , Aminopirina/metabolismo , Ratos , Hepatócitos , Extratos Vegetais , Oxirredutases N-Desmetilantes , Estreptozocina , Diabetes Mellitus ExperimentalRESUMO
<p><b>OBJECTIVE</b>To evaluate the influence of individual genetic polymorphisms of metabolic enzymes on urinary styrene metabolites.</p><p><b>METHODS</b>58 workers occupationally exposed to styrene were divided into the high exposure group (≥ 100 mg/m³) and the low exposure group (< 100 mg/m³). The microfluidic chip technology was used to determine the SNPs of CYP2B6, CYP2D6 and GSTP1 and the influence of gene polymorphisms on the metabolism of styrene was statistically analyzed.</p><p><b>RESULTS</b>The level of urine styrene metabolites level was influenced by genotypes of CYP2B6, CYP2D6 and GSTP1 [(280.28 +/- 100.60) mg/g Cr vs (183.48 +/- 127.52) mg/g Cr, (233.04 +/- 77.56) mg/g Cr vs (152.46 +/- 95.47) mg/g Cr, (32.88 +/- 7.14) mg/g Cr vs (24.47 +/- 5.59) mg/g Cr, P < 0.05)]. The metabolism of CYP2B6 G/G homozygotic genotype to styrene was more active than G/T heterozygotic genotype and T/T mutation genotype. The level of PHEMA in GSTP1 homozygotic genotype subjects was significantly higher than that in the group of homozygotic genotype [(32.07 +/- 7.32) mg/g Cr vs (25.59 +/- 6.95) mg/g Cr, P < 0.05)]. The influence of CYP2D6 genotypes on urinary metabolites was also observed in the same study [(56.36 +/- 109.72) mg/g Cr vs (177.13 +/- 116.21) mg/g Cr, (118.73 +/- 84.55) mg/g Cr vs (148.48 +/- 99.83) mg/g Cr, (18.29 +/- 13.50) mg/g Cr vs (19.95 +/- 13.30) mg/g Cr, P < 0.05)].</p><p><b>CONCLUSION</b>Genotypes of CYP2B6, GSTP1 and CYP2D6 are related to susceptibility to the metabolism of styrene in human.</p>
Assuntos
Adulto , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem , Hidrocarboneto de Aril Hidroxilases , Genética , Citocromo P-450 CYP2B6 , Citocromo P-450 CYP2D6 , Genética , Genótipo , Glutationa S-Transferase pi , Genética , Exposição Ocupacional , Oxirredutases N-Desmetilantes , Genética , Polimorfismo Genético , Estireno , Farmacocinética , UrinaRESUMO
This study is to evaluate the cytotoxicity of mitomycin C (MMC) and its analogue 5-(aziridin-1-yl)-3-hydroxymethyl-1-methylindole-4,7-dione (629) as well as the effect of transfection of constitutive androstane receptor (CAR) on their biological effects. HepG2 cells were transfected with the plasmids mCAR1/pCR3 mediated by liposome. Vector pCR3 was used as control. Transfected cells were screened by G418 resistance and limiting dilution. The expressions of plasmid mCAR1/pCR3 and CYP2B6 mRNA were detected by RT-PCR; Cytotoxicities of MMC and 629 in vitro were evaluated in g2car cells and HepG2 cells by MTT method under anaerobic and aerobic conditions. mRNA expression of CAR and CYP2B6 can not be detected in HepG2 cells and HepG2/pCR3 cells but can in g2car cells. It is shown that plasmid mCAR1/pCR3 was transfected into g2car cells successfully and target CYP2B6 was transactivated by CAR. To compare with aerobic and anaerobic, the cytotoxicities of MMC and 629 to HepG2 cells and g2car cells had significantly enhanced (P < 0.05), and transfect CAR gene can improve the cytotoxicity of MMC (P < 0.05), but not 629 (P > 0.05). Furthermore, CYP2B6 is one master enzyme for the metabolism of MMC and not 629. Transfection of CAR can increase expression of CYP2B6 mRNA in HepG2 cells, and can affect cytotoxicities of MMC and 629.
Assuntos
Humanos , Antibióticos Antineoplásicos , Farmacologia , Hidrocarboneto de Aril Hidroxilases , Genética , Aziridinas , Farmacologia , Carcinoma Hepatocelular , Metabolismo , Patologia , Morte Celular , Hipóxia Celular , Linhagem Celular Tumoral , Citocromo P-450 CYP2B6 , Indóis , Farmacologia , Concentração Inibidora 50 , Neoplasias Hepáticas , Metabolismo , Patologia , Mitomicina , Farmacologia , Oxirredutases N-Desmetilantes , Genética , Plasmídeos , RNA Mensageiro , Metabolismo , Receptores Citoplasmáticos e Nucleares , Genética , Proteínas Recombinantes , Genética , Fatores de Transcrição , Genética , TransfecçãoRESUMO
Studies on the modulation of the carcinogen metabolizing enzymes on treatment with masheri extract (ME) and benzo (a) pyrene (B (a)P), were carried out in male Sprague Dawley rats (12 weeks old) fed a nutritionally adequate standard diet. Injection (ip) of ME and B (a) P at 3/4 LD50 dose given in 3 doses at 24 hr interval increased the phase I activating enzymes, viz. cytochrome P-450, benzo (a) pyrene hydroxylase and benzphetamine demethylase while both ME and B (a) P significantly depleted glutathione content and decreased glutathione-S transferase activity. Furthermore, the same treatment of ME and B (a) P significantly depleted the hepatic vitamin A pool while a concommittant increase in vitamin C content was observed.