title: Neurotoxic effects of combined treatment of 2,5-hexanedione and triethyllead chloride.
abstract: Triethyllead chloride and 2,5-hexanedione are known neurotoxicants that apparently work through separate mechanisms. The effect of combined treatment of triethyllead chloride and 2,5-hexanedione for 6 weeks on Fischer 344 rats was investigated. Ten rats were given 0.7 mg/kg triethyllead chloride in a volume of 2 ml/kg by gavage while another group was given 0.5% 2,5-hexanedione in drinking water and vehicle by gavage (2 ml/kg). A third group was given a combination of the two treatments. A fourth group served as controls and was given vehicle by gavage. 2,5-Hexanedione produced a reversible loss of body weight, decreased grip strength, and decreased horizontal motor activity. Triethyllead chloride alone increased hot-plate latencies. Triethyllead chloride and 2,5-hexanedione treated animals recovered 4 weeks after cessation of treatment. Neither treatment alone produced fatalities. In combination (2,5-hexanedione + triethyllead chloride) decreases in body weight appeared additive and there was a 40% mortality by 6 weeks of dosing. Rats given the combined treatment had significant loss of both grip strength and increased hot-plate latencies. Neurobehavioral deficits and neuropathological changes were greater in the combined treatment with 2,5-HD and TEL than when either chemical was used alone; there was little indication of a synergistic interaction between these two types of neurotoxicants.
mesh_terms: D000284:Administration, Oral; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D004357:Drug Synergism; D006588:Hexanones / Q000633:toxicity*; D007659:Ketones / Q000633:toxicity*; D008099:Liver / Q000187:drug effects / Q000201:enzymology; D008297:Male; D009043:Motor Activity / Q000187:drug effects*; D009245:NADH Dehydrogenase / Q000378:metabolism; D009942:Organometallic Compounds / Q000633:toxicity*; D051381:Rats; D011916:Rats, Inbred F344; D011930:Reaction Time / Q000187:drug effects; D012584:Sciatic Nerve / Q000187:drug effects / Q000473:pathology
chemical_list: D006588:Hexanones; D007659:Ketones; D009942:Organometallic Compounds; C010360:triethyllead; C011269:2,5-hexanedione; D009245:NADH Dehydrogenase