Adolescent toluene exposure produces enduring social and cognitive deficits in mice: an animal model of solvent-induced psychosis.
OBJECTIVE
Abuse of toluene-containing volatile solvents by adolescents is a significant public health problem. The present study characterized the long-term behavioural and neurochemical consequences of toluene exposure during adolescence.


METHODS
Male NMRI mice received one injection per day of either toluene (600 mg/kg) or corn oil during postnatal days (PN) 35-37 and (750 mg/kg) during PN38-39 and PN42-46. A variety of psychiatric disorder-relevant behavioural tests were examined at PN56-P84.


RESULTS
The toluene-exposed mice were significantly deficient in the social interaction test, nesting behaviour, social dominance tube test, and novel objective recognition test. However, toluene exposure did not affect locomotor activity and behavioural profiles in the forced swimming test, tail suspension test, emergence test and elevated plus maze. Neurochemically, the turnover rates of dopamine in the prefrontal cortex, striatum and nucleus accumbens were reduced in toluene-treated mice.


CONCLUSIONS
Adolescent toluene exposure leads to social deficits and cognitive impairment at adulthood as well as neurochemical dysfunction in mice, which correlate with the symptoms observed in patients suffering from solvent-induced psychosis. These findings highlight the need for understanding the effects of solvent abuse on the developing nervous system and reveal an animal model suitable for research into pathophysiology of neurological and psychiatric consequences of solvent abuse.
Lin
Bih-Fen
BF
Institute of Pharmacology and Toxicology, Hualien, Taiwan.
Ou
Mei-Chun
MC
Chung
Shiang-Sheng
SS
Pang
Cheng-Yoong
CY
Chen
Hwei-Hsien
HH
D000704:Analysis of Variance; D000818:Animals; D000831:Animals, Newborn; D001522:Behavior, Animal / Q000187:drug effects*; D003072:Cognition Disorders / Q000097:blood / Q000139:chemically induced*; D003314:Corn Oil / Q000008:administration & dosage; D004195:Disease Models, Animal; D008297:Male; D018782:Maze Learning / Q000187:drug effects; D051379:Mice; D009043:Motor Activity / Q000187:drug effects; D009425:Nesting Behavior / Q000187:drug effects; D011605:Psychoses, Substance-Induced / Q000097:blood*; D021641:Recognition, Psychology / Q000187:drug effects; D012919:Social Behavior; D012930:Social Dominance; D012997:Solvents / Q000378:metabolism / Q000633:toxicity*; D019966:Substance-Related Disorders / Q000097:blood; D014050:Toluene / Q000097:blood / Q000633:toxicity*
D012997:Solvents; D014050:Toluene; D003314:Corn Oil