Acute and prolonged stress responses of brain monoaminergic activity and plasma cortisol levels in rainbow trout are modified by PAHs (naphthalene, beta-naphthoflavone and benzo(a)pyrene) treatment

Aquatic Toxicology
Manuel GestoJesús M Míguez

Abstract

We have investigated if treatment with two different PAHs such as naphthalene (NAP) and benzo(a)pyrene (BaP), and the PAH-like compound beta-naphthoflavone (BNF), may modify the stress responses elicited in rainbow trout by acute or prolonged stress stimuli, and the possible involvement of brain monoamines in those responses. Two experiments (acute and prolonged stress) were performed. In the acute stress experiment, fish were i.p. injected with vegetable oil alone (control) or oil containing NAP, BNF or BaP (10 mg kg(-1)), and 72 h after injection fish were acutely stressed by chasing for 15 min. In the prolonged stress experiment, a similar group-design and injection protocol were followed, but fish were submitted to severe confinement stress by maintaining fish under high stock density (70 kg fish mass m(-3)) for 72 h. The levels of cortisol, glucose and lactate were assayed in plasma. In addition, the contents of dopamine (DA), noradrenaline (NA) and serotonin (5HT), as well as their oxidized amine metabolites, 3,4-dihydroxyphenylacetic acid (DOPAC) and 5-hydroxy-3-indoleacetic acid (5HIAA) were assayed in telencephalon, hypothalamus, preoptic region, optic tectum and brain stem, as well as the pituitary. Both acute and pro...Continue Reading

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Citations

Dec 17, 2009·Fish Physiology and Biochemistry·Ethan D ClotfelterCliff H Summers
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