Repeated forced swim stress has additive effects in anxiety behavior and in cathecolamine levels of adult rats exposed to deltamethrin

Abstract Deltamethrin (DTM) is a type II pyrethroid insecticide that elicits autonomic and neuroendocrine responses that indicate high levels of stress, presumably caused by the neurotoxic effect of the insecticide. This study investigated the effect of DTM exposure (10 mg/kg, p.o.) and an additiona...

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Bibliographic Details
Published in:Neurotoxicology and teratology 2014-11, Vol.46, p.57-61
Main Authors: Habr, Soraya F, Macrini, Daclé J, Spinosa, Helenice de S, Florio, Jorge C, Bernardi, Maria M
Format: Article
Language:English
Subjects:
Animals
Anxiety
Anxiety - chemically induced
Anxiety - psychology
Catecholamines - analysis
Corpus Striatum - chemistry
Corpus Striatum - drug effects
Corticosterone - blood
Deltamethrin
Emergency
Forced swimming
Insecticides - toxicity
Male
Medical Education
Motor Activity - drug effects
Nitriles - toxicity
Pesticide
Pyrethrins - toxicity
Pyrethroid
Rats
Rats, Wistar
Social Behavior
Stress
Stress, Psychological
Swimming
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Summary:Abstract Deltamethrin (DTM) is a type II pyrethroid insecticide that elicits autonomic and neuroendocrine responses that indicate high levels of stress, presumably caused by the neurotoxic effect of the insecticide. This study investigated the effect of DTM exposure (10 mg/kg, p.o.) and an additional stress induced in the forced swim test (FST) in behavioral tasks related to anxiety, serum corticosterone levels, and striatal neurotransmitter levels. Open field behavior and social interaction were evaluated after DTM administration (10 mg kg − 1 , p.o). DTM per se reduced rearing frequency in the open field, but no alterations in locomotion frequency or immobility duration were detected. Stress increased immobility duration compared with non-stressed animals. DTM reduced social interaction and increased corticosterone levels, and these effects were enhanced in stressed animals. Mainly stress affected dopaminergic and serotoninergic activity. In anxiety behavior and in both neurotransmitters and metabolites levels it was observed an additive effect of stress in DTM treated rat data. These results indicate that DTM enhanced the anxiogenic responses and stress had an additive effect over the DTM stress. The neurochemical data did not indicate an interaction between stress and DTM exposure. The present results may be important for implementing pyrethroid insecticide safety standards.
ISSN:0892-0362
1872-9738
DOI:10.1016/j.ntt.2014.10.001