1. CONICET
  2. Producciónes CyT
Producción CyT
Genotoxic Effects of Benzo[a]pyrene and Dibenzo[a,l]pyrene in a Human Lung Cell Line

Artículo

Autoría
GRILLO, CLAUDIA ALEJANDRA
Fecha
2006
Editorial y Lugar de Edición
SAGE PUBLICATIONS INC
Revista
INTERNATIONAL JOURNAL OF TOXICOLOGY, vol. 25 (pp. 49-55) SAGE PUBLICATIONS INC
Resumen Información suministrada por el agente en SIGEVA
Several studies have shown that polycyclic aromatic hydrocarbons (PAHs) produce genotoxic effects in assays performed in vivo and in vitro. This study was undertaken to investigate the ability of benzo[a]pyrene (BP) and dibenzo[a,l]pyrene (DBP) to induce DNA damage in a human lung fibroblast cell line (MRC-5), using sister-chromatid exchanges test (SCEs), the comet assay, and evaluating point mutations in codon 12 of the K-ras protooncogene by polymerase chain reaction–single-strand confo... Several studies have shown that polycyclic aromatic hydrocarbons (PAHs) produce genotoxic effects in assays performed in vivo and in vitro. This study was undertaken to investigate the ability of benzo[a]pyrene (BP) and dibenzo[a,l]pyrene (DBP) to induce DNA damage in a human lung fibroblast cell line (MRC-5), using sister-chromatid exchanges test (SCEs), the comet assay, and evaluating point mutations in codon 12 of the K-ras protooncogene by polymerase chain reaction–single-strand conformation polymorphisms (PCR-SSCPs) and restriction fragment length polymorphisms (RFLP)-enriched PCR methods. Sister-chromatid exchanges frequencies were significantly increased in cells exposed to benzo[a]pyrene and dibenzo[a,l]pyrene in relation to controls (p <.001). Using the standard alkaline comet assay, significant differences between groups were found for the variable comet moment (CM)when cells were exposed toBP(p <.001) andDBP(p <.001). Nevertheless, PCR-SSCP and RFLP-enriched PCR methods did not show any association between treatments with BP and DBP and K-ras point mutations. The data presented in this study indicated that BP and DBP induced both DNA strand breaks and sister-chromatid exchanges but not significant point mutations at codon 12 of K-ras gene in the MRC-5 cell line.
Ver más Ver menos
Palabras Clave
benzo-a-pyrrenek-ras protooncogenecomet assay