IMMUNOSUPPRESSIVE ACTIVITY OF POLYCHLORINATED BIPHENYL MIXTURES AND CONGENERS - NONADDITIVE (ANTAGONISTIC) INTERACTIONS

IMMUNOSUPPRESSIVE ACTIVITY OF POLYCHLORINATED BIPHENYL MIXTURES AND CONGENERS - NONADDITIVE (ANTAGONISTIC) INTERACTIONS
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DOI:
10.1006/faat.1995.1116
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发表时间:
1995-08-01
期刊:
FUNDAMENTAL AND APPLIED TOXICOLOGY
影响因子:
--
通讯作者:
SAFE, S
SAFE, S
中科院分区:
其他
文献类型:
--
作者:
HARPER, N;CONNOR, K;SAFE, S

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在雌性 B3C3F1 小鼠中,测定了几种多氯联苯 (PCB) 混合物和同源物对脾斑形成细胞 (PFC) 反应和血清 IgM 单位对抗原三硝基苯基脂多糖的剂量反应抑制。 Aroclor 1260、1254、1248 和 1242 诱导的免疫毒性的 ED50 值在 355 至 699 mg/kg 之间变化不到两倍。 2,3,7,8-四氯二苯并-对二恶英 (TCDD)、3,3',4,4'-四氯联苯、3,3',4,4',5-pentaCB、3,3',4,4',5,5'-hexaCB、2,3,3',4,4'-pentaCB、 2,3',4,4',5-pentaCB、2,3,3',4,4',5-hexaCB、2,3,3',4,4',5,5'-heptaCB、2,2',3,3',4,4',5-heptaCB 和 2,2',3,4,4',5,5'-heptaCB 为 4.6 至 4.9, 134至245、4.7至7.0、6.9 至 11.1、88,000 至 121,000、122,000 至 132,000、99,000 至 157,000、89,000 至 129,000、117,000 至 240,000 和 132,000 至 238,000 μg/kg,分别。这些同源物的免疫毒性衍生毒性当量因子 (TEF) 可以根据 ED50 (TCDD)/ED50(同源物)比率计算,并且 TEF 值在先前为其他芳基烃受体介导的反应确定的范围内。根据 PCB 混合物中这些同源物的已知浓度,使用免疫毒性衍生的 TEF(噬菌斑形成细胞/10(6) 个活细胞)计算混合物中的 TCDD 或毒性当量 (TEQ) [即 TEQ = Sigma (PCBcongener X TEF)]。 Aroclors 1260、1254、1248 和 1242 的 TEQ 值分别为 16.0、54.4、260.4 和 197 ppm。根据TCDD免疫抑制活性的ED50值(4.8μg/kg),计算出Aroclors 1260、1254、1248和1242的免疫抑制活性ED50值分别为300、88、18和24mg/kg。 Aroclors 1260、1254、1248 和 1242 的 ED50(观察值)/ED50(计算值)比率分别为 1.2、5.9、21 和 22.0。因此,对于 Aroclors 1254、1248 和 1242,高 ED50(观察值)/ED50(计算值)比率(即 5.9 比 22.0)表明 TEF 方法高估了这些混合物由于 PCB 的非加成(拮抗)相互作用而产生的毒性。相反,TEF 方法可用于确定 Aroclor 1260 混合物的免疫毒性。 (C) 1999 年毒理学会
The dose-response inhibition of the splenic plaque-forming cell (PFC) response and serum IgM units to the antigen, trinitrophenyl-lipopolysaccharide, was determined for several polychlorinated biphenyl (PCB) mixtures and congeners in female B3C3F1 mice. The ED50 values for Aroclor 1260-, 1254-, 1248-, and 1242-induced immunotoxicity varied by less than twofold from 355 to 699 mg/kg. The range of ED50 values for 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), 3,3',4,4'-tetrachlorobiphenyl, 3,3',4,4',5-pentaCB, 3,3',4,4',5,5'-hexaCB, 2,3,3',4,4'-pentaCB, 2,3',4,4',5-pentaCB, 2,3,3',4,4',5-hexaCB, 2,3,3',4,4',5,5'-heptaCB, 2,2',3,3',4,4',5-heptaCB, and 2,2',3,4,4',5,5'-heptaCB were 4.6 to 4.9, 134 to 245, 4.7 to 7.0, 6.9 to 11.1, 88,000 to 121,000, 122,000 to 132,000, 99,000 to 157,000, 89,000 to 129,000, 117,000 to 240,000, and 132,000 to 238,000 mu g/kg, respectively. The immunotoxicity-derived toxic equivalency factors (TEFs) for these congeners could be calculated from the ED50 (TCDD)/ED50 (congener) ratios and the TEF values were within the range of those previously determined for other aryl hydrocarbon receptor-mediated responses. Based on the known concentrations of these congeners in the PCB mixtures, TCDD or toxic equivalents (TEQs) in the mixture were calculated [i.e., TEQ = Sigma (PCBcongener X TEF)] using the immunotoxicity-derived TEFs (plaque-forming cells/10(6) viable cells). TEQ values for Aroclors 1260, 1254, 1248, and 1242 were 16.0, 54.4, 260.4, and 197 ppm, respectively. Based on the ED50 value for the immunosuppressive activity of TCDD (4.8 mu g/kg), the calculated ED50 values for immune suppression by Aroclors 1260, 1254, 1248, and 1242 were 300, 88, 18, and 24 mg/kg, respectively. The ED50 (observed)/ED50 (calculated) ratios were 1.2, 5.9, 21, and 22.0 for Aroclors 1260, 1254, 1248 and 1242, respectively. Thus, for Aroclors 1254, 1248, and 1242, the high ED50 (observed)/ED50 (calculated) ratios (i.e., 5.9 to 22.0) indicate that the TEF approach overestimates the toxicity of these mixtures due to nonadditive (antagonistic) interactions of the PCBs. In contrast, the TEF approach was useful in determining the immunotoxicity of the Aroclor 1260 mixture. (C) 1999 Society of Toxicology