title: Effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin on indocyanine green blood clearance in rhesus monkeys.
abstract: To assess effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) on liver function adult male rhesus monkeys were treated with a single oral dose of acetone/corn oil (control) or 5, 25, or 75 micrograms/kg TCDD. Each monkey was used as its own control and indocyanine green (ICG) blood clearance and the following serum enzymes: glutamic pyruvate transaminase (SGPT), sorbitol dehydrogenase (SDH) and gamma glutamyl transpeptidase (gamma GTP), were measured at regular intervals for 4 weeks before and 17 weeks after treatment. In control monkeys ICG blood clearance and serum enzymes were similar before and after treatment. However, in the monkey that received 5 micrograms/kg TCDD there was a mild increase in ICG blood clearance followed by a slight decrease. The magnitude of this biphasic change was greater in monkeys that received 25 and 75 micrograms/kg TCDD and the decrease in clearance was invariably associated with a 1--2-week period before the monkeys died. SDH and SGPT activities were elevated at some time during the course of intoxication in all TCDD-treated monkeys but gamma GTP activity was not altered. The monkey treated with 5 micrograms/kg TCDD survived but monkeys treated with 25 and 75 micrograms/kg died 4--6 weeks after treatment. Light microscopy of the livers of TCDD-treated monkeys that died revealed fatty infiltration with minimal hepatocellular necrosis.
mesh_terms: D000410:Alanine Transaminase / Q000097:blood; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D004147:Dioxins / Q000633:toxicity*; D000882:Haplorhini; D007208:Indocyanine Green / Q000097:blood*; D007700:Kinetics; D007928:Lethal Dose 50; D008099:Liver / Q000033:anatomy & histology; D008253:Macaca mulatta; D008297:Male; D000072317:Polychlorinated Dibenzodioxins / Q000633:toxicity*; D013385:Succinate Dehydrogenase / Q000097:blood; D013997:Time Factors
chemical_list: D004147:Dioxins; D000072317:Polychlorinated Dibenzodioxins; D013385:Succinate Dehydrogenase; D000410:Alanine Transaminase; D007208:Indocyanine Green