title: Neurobehavioral effects of acute exposure to aromatic hydrocarbons.
abstract: This article reports the results of neurobehavioral tests on representative aromatic constituents, specifically C(9) to C(11) species. The testing evaluated effects in several domains including clinical effects, motor activity, functional observations, and visual discrimination performance. Exposures ranging from 600 to 5000 mg/m(3), depending on the molecular weights of the specific aromatic constituents, produced minor, reversible effects on the central nervous system (CNS), particularly in the domains of gait and visual discrimination. There was little evidence of effects at lower exposure levels. There was some evidence of respiratory effects at 5000 mg/m(3) in 1 study, and there were also minor changes in body weight and temperature. The CNS effects became less pronounced with repeated exposures, corresponding to lower concentrations in the brain of 1 representative substance, 1,2,4-trimethyl benzene (TMB). At high exposure levels, the alkyl benzenes apparently induced their own metabolism, increasing elimination rates.
authors.affiliation: ExxonMobil Biomedical Sciences, Inc., 1545 Route 22 East, Annandale, NJ 08801, USA. richard.h.mckee@exxonmobil.com
authors.forename: Richard H
authors.initials: RH
authors.lastname: McKee
authors.forename: J H C M
authors.initials: JH
authors.lastname: Lammers
authors.forename: H
authors.initials: H
authors.lastname: Muijser
authors.forename: D E
authors.initials: DE
authors.lastname: Owen
authors.forename: B M
authors.initials: BM
authors.lastname: Kulig
mesh_terms: D000818:Animals; D001143:Arousal / Q000187:drug effects; D001555:Benzene Derivatives / Q000008:administration & dosage / Q000378:metabolism / Q000493:pharmacokinetics / Q000633:toxicity; D001833:Body Temperature Regulation / Q000187:drug effects; D001835:Body Weight / Q000187:drug effects; D001921:Brain / Q000187:drug effects / Q000378:metabolism; D002490:Central Nervous System / Q000187:drug effects; D003292:Convulsants / Q000008:administration & dosage / Q000378:metabolism / Q000493:pharmacokinetics / Q000633:toxicity; D004305:Dose-Response Relationship, Drug; D005684:Gait / Q000187:drug effects; D006841:Hydrocarbons, Aromatic / Q000008:administration & dosage / Q000378:metabolism / Q000493:pharmacokinetics / Q000633:toxicity*; D019570:Inhalation Exposure / Q000009:adverse effects*; D008297:Male; D009043:Motor Activity / Q000187:drug effects; D009465:Neuromuscular Agents / Q000008:administration & dosage / Q000378:metabolism / Q000493:pharmacokinetics / Q000633:toxicity; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D012137:Respiratory System / Q000187:drug effects; D012997:Solvents / Q000008:administration & dosage / Q000378:metabolism / Q000493:pharmacokinetics / Q000633:toxicity*; D013997:Time Factors; D014796:Visual Perception / Q000187:drug effects
chemical_list: D001555:Benzene Derivatives; D003292:Convulsants; D006841:Hydrocarbons, Aromatic; D009465:Neuromuscular Agents; D012997:Solvents; C010313:pseudocumene