Identificação de biomarcadores para o diagnóstico da toxoplasmose aguda e congênita
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2020-11-27
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Universidade Federal de Goiás
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Introduction: The diagnosis of congenital toxoplasmosis is complex and might take months to confirm since most newborns do not present symptoms and levels of undetected IgM and IgA anti-Toxoplasma gondii antibodies. Besides, pregnant women may have residual IgM, making it difficult to diagnose acute infection during pregnancy. Despite the various serological tests developed, there are few studies about biomarkers that can assist in the diagnosis of acute and congenital toxoplasmosis. Objective: Analyze the immunoreactivity profile of T. gondii protein with the potential to be biomarkers for the diagnosis of acute toxoplasmosis and the diagnosis and prognosis of congenital toxoplasmosis. Methods: Serum samples were selected from children with symptomatic and asymptomatic congenital toxoplasmosis and women of childbearing age or pregnant women with acute and chronic acquired toxoplasmosis. These samples were grouped according to the patients' laboratory and clinical results. Sodium Dodecyl Sulfate - Polyacrylamide Gel Electrophoresis (SDS-PAGE) was used to separate T. gondii proteins. The Immunoblotting technique was applied to the analysis of immunoreactive bands profile by IgG antibodies, using nitrocellulose membranes sensitized with parasite proteins. Results: One hundred and sixteen samples were analyzed. When comparing immunoreactive bands profile for antibodies present in samples from different groups and subgroups, the 150, 18.5, and 16.96 kDa proteins were more immunoreactive by the antibodies present in serum samples from the acquired infection group. The 343, 189, 150, 75, and 42 kDa proteins showed more chance to be detected by the symptomatic congenital infection subgroup, while the 61, 50, and 16.96 kDa proteins were significantly immunoreactive by the acute infection subgroup. Conclusions: Before obtained results, it was possible to identify potential biomarkers that may assist in early diagnosis and treatment of toxoplasmosis, avoiding the appearance of clinical manifestations throughout the life of children congenitally infected.
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STORCHILO, H. R. Identificação de biomarcadores para o diagnóstico da toxoplasmose aguda e congênita. 2020. 110 f. Tese (Doutorado em Medicina Tropical e Saúde Publica) - Universidade Federal de Goiás, Goiânia, 2020.