Resumo

MENDOZA MEZA, Dary Luz et al. Identification of electrophoretic fractions of the IgE-binding in Ascaris sp. extracts. Rev Cubana Invest Bioméd [online]. 2013, vol.32, n.2, pp.171-177. ISSN 0864-0300.

Background: Ascaris lumbricoides infects a quarter of the world's population, thus becoming a public health problem. Human ascariasis is associated with chronic and acute morbidity, especially in children. Recently, it has been stated that the existence of IgE antibodies in the blood serum of allergic patients that have cross reactivity with domestic arthropods and antigens of Ascaris sp. could increase the number of samples seropositive for Ascaris sp. in populations who are sensitized to house dust mites. Objective: To produce whole body extracts of both A. lumbricoides and A. suum, and to evaluate their antigenic properties and the IgE-binding capacity in patients allergic to the house dust mite (Dermatophagoides pteronyssinus). Methods: The extracts were obtained by homogenization and osmotic lysis in the presence of Tween-20 and protease inhibitors. The protein profile of each extract was identified by sodium dodecyl sulphate-polyacrylamide gel elctrophoresis (SDS-PAGE). Antigen reactivity was determined by Western blotting, using eleven sera from allergic patients with the diagnosis of asthma. Results: SDS-PAGE revealed 20 major electrophoretic fractions (20-200 kDa). Western Blotting revealed differences in the protein profile of the immunologlobulin IgE-binding of the extracts. Conclusions: Whole body proteins of both A. lumbricoides and A. suum showed a different IgE-binding profile in the Western blotting, with sera from patients allergic to the D. pteronyssinus mite, suggesting the presence of species-specific markers between the two parasites, which could be used in further biomedical research.

Palavras-chave : Helminths; Ascaris lumbricoides; Ascaris suum; IgE.

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