TY - JOUR T1 - Early Modification of <em>c-myc</em>, <em>Ha-ras</em> and <em>p53</em> Expressions by Chemical Carcinogens (DMBA, MNU) JF - In Vivo JO - In Vivo SP - 591 LP - 598 VL - 23 IS - 4 AU - FERENC BUDÁN AU - TÍMEA VARJAS AU - GHODRATOLLAH NOWRASTEH AU - IDA PRANTNER AU - ZSUZSA VARGA AU - ÁGOSTON EMBER AU - JÓZSEF CSEH AU - KATALIN GOMBOS AU - EMESE PÁZSIT AU - GYULA GŐBEL AU - MIKLÓS BAUER AU - TÜNDE GRACZA AU - ISTVÁN ARANY AU - PÁL PERJÉSI AU - ISTVÁN EMBER AU - ISTVÁN KISS Y1 - 2009/07/01 UR - http://iv.iiarjournals.org/content/23/4/591.abstract N2 - 7,12-Dimethylbenz[a]anthracene (DMBA) and N-methyl-N-nitrosourea (MNU) are important environmental carcinogens. Their different biological effects were examined in CBA/Ca H-2K haplotype inbred mice on the gene expression of c-myc, Ha-ras and p53 through a 24 hour period. Elevated expression of c-myc and Ha-ras genes was found in the spleen, lung, thymus and lymph nodes 6 and 12 hours after DMBA treatment and in the lung and thymus 3 hours after MNU treatment. In the liver, DMBA induced strong onco/suppressor gene expression as early as 6 hours after the treatment, but MNU increased the p53 gene expression 12 hours after the treatment. The gene expression patterns reflected the different mechanism of the direct acting MNU and metabolically activated DMBA. This phenomenon provides evidence as to the usefulness of detection of onco/supressor key gene expression as early molecular epidemiological biomarkers of carcinogenesis and carcinogenic exposure in animal model, useful in human cancer prevention practice as well. ER -