A sandwich enzyme-linked immunosorbent assay for adducts of polycyclic aromatic hydrocarbons with human serum albumin.

A sandwich enzyme-linked immunosorbent assay for adducts of polycyclic aromatic hydrocarbons with human serum albumin.
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DOI:
10.1016/j.ab.2010.01.018
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发表时间:
2010-05-01
影响因子:
2.9
通讯作者:
Rappaport SM
Rappaport SM
中科院分区:
生物学4区
文献类型:
--
作者:
Chung MK;Riby J;Li H;Iavarone AT;Williams ER;Zheng Y;Rappaport SM

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苯并[α]芘二醇环氧化物(BPDE)2与血液亲核试剂的加合物已被用作多环芳烃(PAHs)暴露的生物标志物。最流行的此类测定是竞争性ELISA,其使用单克隆抗体8 E11在从淋巴细胞DNA或人血清白蛋白(HSA)水解BPDE加合物后检测苯并[α]芘四醇。我们在夹心ELISA中使用8 E11作为捕获抗体,直接检测1 mg HSA样品或20 μL血清/血浆中的BPDE-HSA加合物。该测定采用抗HSA抗体进行检测,其通过抗生物素蛋白/生物素化辣根过氧化物酶复合物扩增。夹心ELISA具有特异性强、操作简便等优点,其灵敏度比竞争ELISA高10倍左右。为了验证检测,HSA样本进行了分析,从三个人口与已知的高(焦炉工人),中(钢铁厂控制工人),低(志愿者受试者)多环芳烃暴露(n = 30)。BPDE-HSA加合物的相应几何平均水平,即,67.8、14.7和1.93 ng/mg HSA(1,010、220和28.9 fmol BPDE当量/mg HSA),具有显著差异(p < 0.05)。夹心ELISA将是有用的筛选PAH暴露在大型流行病学研究,并可以扩展到其他加合物的捕获抗体。
Adducts of benzo[α]pyrene-diolepoxide (BPDE)2 with blood nucleophiles have been used as biomarkers of exposure to polycyclic aromatic hydrocarbons (PAHs). The most popular such assay is a competitive ELISA which employs monoclonal antibody 8E11 to detect benzo[α]pyrene tetrols following hydrolysis of BPDE adducts from lymphocyte DNA or human serum albumin (HSA). Here we use 8E11 as the capture antibody in a sandwich ELISA to detect BPDE-HSA adducts directly in 1 mg samples of HSA or 20 μL of serum/plasma. The assay employs an anti-HSA antibody for detection, which is amplified by an avidin/biotinylated horseradish peroxidase complex. The sandwich ELISA has advantages of specificity and simplicity and is about 10 times more sensitive than the competitive ELISA. To validate the assay, HSA samples were assayed from three populations with known high (coke-oven workers), medium (steel-factory control workers), and low (volunteer subjects) PAH exposures (n = 30). The respective geometric mean levels of BPDE-HSA adducts, i.e., 67.8, 14.7 and 1.93 ng/mg HSA (1,010, 220 and 28.9 fmol BPDE equivalents/mg HSA), were significantly different (p < 0.05). The sandwich ELISA will be useful for screening PAH exposures in large epidemiologic studies and can be extended to other adducts for which capture antibodies are available.
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