RESUMO
An important molecular target for cancer therapy is the possible reactivation of tumor suppressor genes that have been silenced by promoter methylation. It was observed that the treatment of an adenocarcinoma cervical cancer cell line, HeLa with 20 μg/ml of the ethanolic extract of Withania somnifera for 6 days resulted in demethylation of promoter of RARβ2 gene. However, treatment with Ocimum sanctum and Azadirachta indica (20μg/ml) did not cause the reversal of hypermethylation after 6 days of treatment. This is the first report to show the reversal of hypermethylation of RARβ2 gene by Withania somnifera extract in a cervical cancer cell line.
RESUMO
Various genotoxic textile dyes, xenobiotics, substrates (10 µM) and agrochemicals (100 µg/ml) were tested for enhancement of alkalophilic laccase activity inã-proteobacterium JB. Neutral Red, Indigo Carmine, Naphthol Base Bordears and Sulphast Ruby dyes increased the activity by 3.7, 2.7, 2.6 and 2.3 fold respectively. Xenobiotics/substrates like p-toluidine, 8-hydroxyquinoline and anthracine increased it by 3.4, 2.8 and 2.3 fold respectively. Atrazine and trycyclozole pesticides enhanced the activityby 1.95 and 1.5 fold respectively.
Vários corantes têxteis genotóxicos, xenobióticos, substratos (10 mM) e agroquímicos (100 mM/mL) foram testados quanto ao aumento da atividade de lacase em ã-Proteobacterium JB. Os corantes Neutral Red, Indigo Carmine, Naphtol Base Bordears e Sulphast Ruby aumentaram a atividade em 3,7, 2,7, 2,6 e 2,3 vezes, respectivamente. Xenobióticos/substratos como p-toluidina, 8-hidroxiquinolina e antracina aumentaram a atividade em 3,4, 2,8 e 2,3 vezes, respectivamente. Atrazina e pesticidas triciclozol aumentaram a atividade em 1,95 e 1,5 vezes, respectivamente.