犬蛔虫眼病病人血清中特异性IgG和IgE抗体水平的测定(英文)

Specific anti-toxocara IgG and IgE responses in the patients with ocular toxocariasis

目的研究犬蛔虫眼病病人血清中特异性IgG和IgE的抗体的水平。方法应用ELISA和Western-blotting。从东京医科齿科大学国际环境寄生虫学分野实验室储存的脉络膜炎的眼病病人血清中随意抽取105份血清,检测犬蛔虫抗体。结果通过ELISA法,105份血清中有82份IgG和IgE均为阴性(78 .1 %) ,12例血清仅IgG阳性(11 .4 %) ,3例血清仅IgE阳性(2 .9 %) ,8例血清IgG和IgE均为阳性。所有的IgG和IgE阳性的血清,进一步进行Western-blot。IgG的反应带分布在幼虫分泌排泄抗原分子重量(97 .2 -14 .3kDa)的整个范围内,IgE的反应带分布在幼虫分泌排泄抗原分子重量(97 .2—14 .3kDa)的相对狭窄的范围内(29 -45kDa)。结论在这个研究中,我们清楚的说明了一些脉络膜炎病例血清中IgE抗体比IgG抗体具有特异性,因此IgE在眼犬蛔虫病的诊断中具有特异性,IgE在眼犬蛔虫病诊断中的价值还要进行进一步的研究。

To investigate the prevalence of specific anti-Toxocara IgG and IgE antibodies in ocular toxocariasis by means of ELISA and Western blotting, serum samples of 105 cases with uveitis of unidentified etiology were randomly selected from our stocked sera, which were referred to the Section of of Environmental Parasitology of Tokyo Medical and Dental University for detection of the anti-Toxocara antibody. By using ELISA, 82 of them （78.1 %） were negative for both IgG and IgE antibodies, 12 （11.4%） were positive only for IgG, three （2.9%） were positive only for IgE, and eight （7.6%） were positive for IgG and IgE. Among the positive samples, as demonstrated by western bloting the IgG reacting bands were found to distribute in the whole range of molecular weights （97.2-14.3kDa）of excretory-secretory products of T. canis larvae. On the other hand, IgE antigenic molecules were concentrated on a relatively narrow range from 45kDa to 29kDa. In this study, we clearly demonstrated that some of the patients with uveitis showed specific anti-Toxocara IgE antibody but not IgG antibody in serum sample, suggesting that the demonstration of specific IgE antibody should be considered for the precise diagnosis of ocular toxocariasis. Further studies are needed to clarify the diagnosis significance of specific IgE antibody in ocular toxocariasis.