Abstract
Motor and sensory conduction velocities (MCV and SCV) and amplitudes of the sensory and motor action potentials (ASAP and AMAP) of the tail nerve were studied in male Sprague-Dawley rats during chronic oral treatment with five unsaturated aliphatic nitriles. Rats were given doses of 12.5, 25 and 50 mg kg(-1) of acrylonitrile, 50, 70 and 90 mg kg(-1) of methacrylonitrile, 25, 50 and 100 mg kg(-1) of trans-3-pentenenitrile and 50, 100 and 200 mg kg(-1) of either 3-methyl-2-butenenitrile or 4-pentenenitrile once a day, 5 days per week for 12 weeks. Moreover, due the the early results obtained after oral treatment, neurophysiological examinations were also carried out in rats exposed by inhalation to 25, 50 and 100 ppm of acrylonitrile for 6 h a day, 5 days per week for 24 weeks. Rats given acrylonitrile orally developed behavioural sensitization characterized by salivation, locomotor hyperactivity and moderately intense stereotypies. Moreover, rats in the high dose group developed weakness in hindlimbs associated with decreases in SCV and ASAP. Rats exposed to acrylonitrile vapours exhibited time- and concentration-dependent decreases in MCV, SCV and ASAP, which were partially reversible after 8 weeks of recovery. None of the othe...Continue Reading
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