Abstract
This study investigated the working hypothesis that two widely used organophosphate pesticides; Nuvan and Dimecron, exert toxic effects in Drosophila. Transgenic D. melanogaster (hsp70-lacZ) was used as a model for assaying stress gene expression and AchE activity as an endpoint for toxicity and also to evaluate whether stress gene expression is sufficient to protect against toxic insult of the chemicals and to prevent tissue damage. The study was extended to investigate the effect of the pesticides on the life cycle and reproduction of the organism. The study showed that Nuvan affected emergence of the exposed flies more drastically than Dimecron and the effect was lethal at the highest tested concentration (0.075 ppm). While Nuvan at 0.0075 and 0.015 ppm concentrations affected reproduction of the flies significantly, the effect of Dimecron was significant only at 0.015 and 0.075 ppm. Nuvan-exposed third-instar larvae exhibited a 1.2-fold to 1.5-fold greater hsp70 expression compared to Dimecron at concentrations ranging from 0.0075 to 0.075 ppm following 12 and 18 h exposure. While maximum expression of hsp70 was observed in Nuvan-exposed third-instar larval tissues following 18 h exposure at 0.075 ppm, Dimecron at the same dietary concentration induced a maximum expression of hsp70 following 24 h exposure. Further, concomitant with a significant induction of hsp70, significant inhibition of AchE was observed following chemical exposure and temperature shock. Concurrent with a significant decline in hsp70 expression in Nuvan-exposed larvae after 48 h at 0.075 ppm, tissue damage was evident. Dimecron-exposed larvae exhibited a plateau in hsp70 induction even after 48 h exposure and moderate tissue damage was observed in these larvae. The present study suggests that Nuvan is more cytotoxic than Dimecron in transgenic Drosophila melanogaster.
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Abbreviations
- AchE:
-
acetylchloinesterase
- DAB:
-
diaminobenzidine tetrahydrochloride
- ECVAM:
-
European Center for the Validation of Alternative Methods
- HSP:
-
heat shock protein
- HRP:
-
horseradish peroxidase
- MRL:
-
maximum residue limit
- NOAEL:
-
no observed adverse effect level
- ONPG:
-
O-nitrophenyl-β-d-galactopyranoside
- ppm:
-
parts per million
- OP:
-
organophosphate pesticide
- PSS:
-
Poels' salt solution
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Gupta, S.C., Siddique, H.R., Saxena, D.K. et al. Comparative toxic potential of market formulation of two organophosphate pesticides in transgenic Drosophila melanogaster (hsp70-lacZ). Cell Biol Toxicol 21, 149–162 (2005). https://doi.org/10.1007/s10565-005-0145-y
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DOI: https://doi.org/10.1007/s10565-005-0145-y