Application of comet assay in the study of DNA damage and recovery in rohu (Labeo rohita) fingerlings after an exposure to phorate, an organophosphate pesticide.
Ecotoxicology
; 20(1): 283-92, 2011 Jan.
Article
em En
| MEDLINE
| ID: mdl-21153054
ABSTRACT
Labeo rohita (rohu) fingerlings were exposed to different concentrations (0.001, 0.002 and 0.01 ppm) of phorate, an organophosphate pesticide; samplings were done at 24, 48, 72 and 96 h. The study was carried out to evaluate tissue specific genotoxic effects produced by phorate, on three different tissue systems and to assess DNA repair response in fish. Results of tissue specific DNA damage experiments showed low baseline damage in blood cells followed by gill and liver cells in control individuals whereas more DNA breaks were found in liver followed by gill and blood cells of treated individuals. Concentrations-dependent DNA damage showed a strong, linear and positive relationship (r(2) = >0.7) in all three tissues. Clear time-related increase in DNA damage was observed for all tissues exposed to all concentrations except in liver cells at 0.01 ppm, where the DNA damage declined significantly after 72 h. For the assessment of DNA repair response, fingerlings were first exposed to 0.01 ppm of phorate for 72 h and then transferred to pesticide free water. Tissue chosen for the repair experiment was liver. Samplings were done at 0, 3, 6, 12 and 24 h after the release of 72 h pesticide treated fishes into pesticide free water. Fishes showed a reduction in DNA breaks from 3 h onwards in pesticide free water and at 24 h returned to control level damage. The results indicate that phorate is a potential genotoxicant, comet assay can be used in DNA damage and repair analysis, response to pollutants in multicellular animals is often tissue specific.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Praguicidas
/
Forato
/
Poluentes Químicos da Água
/
Dano ao DNA
/
Cyprinidae
/
Ensaio Cometa
Tipo de estudo:
Evaluation_studies
Limite:
Animals
Idioma:
En
Revista:
Ecotoxicology
Assunto da revista:
SAUDE AMBIENTAL
/
TOXICOLOGIA
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Índia