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Development of a highly sensitive IgG-ELISA based on recombinant arginine kinase of Toxocara canis for serodiagnosis of visceral larva migrans in the murine model

Wickramasinghe, Susiji, Yatawara, Lalani, Nagataki, Mitsuru, Takamoto, Misa, Watanabe, Yoshiya, Rajapakse, R. P. V. J., Uda, Kouji, Suzuki, Tomohiko, Agatsuma, Takeshi
Parasitology research 2008 v.103 no.4 pp. 853-858
Toxocara canis, absorbance, animal models, antigens, antiserum, arginine, enzyme-linked immunosorbent assay, humans, larva migrans, mice, rabbits, serodiagnosis, toxocariasis
Toxocariasis is a worldwide zoonotic disease caused by the ascarid nematode Toxocara canis. The most common method available for serodiagnosis of toxocariasis is an enzyme-linked immunosorbent assay (ELISA) test using Toxocara excretory-secretory antigen (TES). The present study describes the development of IgG-ELISA based on antiserum prepared against the recombinant arginine kinase of Toxocara canis. Antiserum was prepared against the purified recombinant arginine kinase (AK) using 6-week-old female Japanese white rabbits. Serum samples were collected from experimentally infected BALB/c and C57BL/6 mice at different time periods. The IgG-ELISA was performed using serum samples from mice (infected/uninfected) and TES antigen with antiserum prepared against the recombinant-AK. The optical density (OD₄₅₀) was measured at 450 nm using a micro-plate ELISA reader. There were significant differences (P < 0.01) in the absorbance between infected and control serum samples. Further, we obtained 100% sensitivity for the serum samples from T. canis-infected mice. Therefore, it is suggested that the recombinant-AK based IgG-ELISA could be applied for immunodiagnosis of human toxocariasis. However, it is necessary to evaluate the specificity of this recombinant antigen with similar geohelminth infections.