1. Induction of hsp70 by the herbicide oxyfluorfen (Goal) in the Egyptian Nile fish, Oreochromis niloticus.
- Author
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Hassanein HM, Banhawy MA, Soliman FM, Abdel-Rehim SA, Müller WE, and Schröder HC
- Subjects
- Animals, Egypt, Electrophoresis, Polyacrylamide Gel, Halogenated Diphenyl Ethers, Kidney drug effects, Kidney metabolism, Liver drug effects, Liver metabolism, HSP70 Heat-Shock Proteins biosynthesis, Phenyl Ethers toxicity, Tilapia physiology
- Abstract
This paper deals with the expression of the biomarker hsp70 in the liver and kidney of the freshwater fish Oreochromis niloticus following exposure to the herbicide oxyfluorfen (Goal). Fishes were exposed to three concentrations, the 96-h LC50 (3 mg/L), the 96-h (1/2)LC50 (1.5 mg/L), and the 96-h (1/4)LC50 (0.75 mg/L) of oxyfluorfen for 6, 15, and 24 days, respectively, and samples were taken at three different time periods for each concentration. The livers responded to the herbicide by an induction of the expression of both the constitutive (hsp75; Mr 75 kDa) and the inducible (hsp73; Mr 73 kDa) hsp70 proteins. In kidney, the herbicide induced a time-dependent increase in the expression of the constitutive hsp70 (hsp75) as well, but the inducible hsp70 (hsp73) required much longer incubation periods to reach maximal levels (15 and 24 days). Our results suggest that expression of hsp70 in fish is a sensitive indicator of cellular responses to herbicide exposure in the aquatic environment.
- Published
- 1999
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