title: Immunosuppression in weanling and adult Sprague-Dawley rats induced by acute exposure to 3,3',4,4'-tetrachloroazoxybenzene.
abstract: The acute immunomodulatory effects of the environmental and occupational contaminant, 3,3',4,4'-tetrachloroazoxybenzene (TCAOB), were investigated on selected immune parameters in weanling and adult Sprague-Dawley rats. Significant immunotoxic effects were found 17 days after 4 doses of 25 mg/kg TCAOB, administered i.p. The main non-immune toxic effects were decreased body, kidney, heart and testis weights, and a simultaneous increase in liver weight. The immune parameters showing significant suppression were: thymic weight, splenic plaque forming cell populations and function, pertioneal macrophage chemiluminescence, and bone marrow cellularity. Weanling animals were affected by TCAOB to a greater extent than adults on both the multiple and single dose regimens. The immunotoxic effects were found to be qualitatively similar to those of its isosteric analog, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). The results demonstrate that TCAOB is a very potent immunotoxic compound and may have long-term effects after a single exposure. This study is the first investigation into the effect of TCAOB on immune functions.
mesh_terms: D000375:Aging; D000818:Animals; D000917:Antibody Formation; D001391:Azo Compounds / Q000276:immunology* / Q000633:toxicity; D001835:Body Weight / Q000187:drug effects; D001853:Bone Marrow / Q000187:drug effects / Q000276:immunology; D007111:Immunity, Cellular / Q000187:drug effects; D007165:Immunosuppression Therapy; D007166:Immunosuppressive Agents / Q000633:toxicity*; D007274:Injections, Intraperitoneal; D007958:Leukocyte Count; D008264:Macrophages / Q000276:immunology; D008297:Male; D009929:Organ Size / Q000187:drug effects; D051381:Rats; D011919:Rats, Inbred Strains; D013154:Spleen / Q000187:drug effects / Q000276:immunology; D010948:Viral Plaque Assay
chemical_list: D001391:Azo Compounds; D007166:Immunosuppressive Agents; C013280:3,4,3',4'-tetrachloroazoxybenzene