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Antigens from Histoplasma capsulatum and Blastomyces dermatitidis

I. Immunological comparative studies from polysaccharide-protein complexes of both fungi

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Abstract

Certain groups of fungi share chemical structures which makes difficult the isolation and differentiation of specific antigens by the usual methods of extraction and purification. Therefore, we have oriented our studies to the immunological and biochemical characterization of differences and similarities of molecular structures from fungi, etiologic agents of systemic mycoses, hoping to establish criteria for the utilization and handling of these antigens.

A deproteinized polysaccharide-protein complex (D-PPC) was isolated from Histoplasma capsulatum and Blastomyces dermatitidis. The immunological studies with humoral tests indicate a variable cross reaction between antigens of both species. In immunodiffussion systems, the reaction was specific for each species using saline solution or phosphate buffer solution, while using an agarose veronal system, the cross reactions were very evident. In addition, differences in cross reactions were obtained with immunoelectrophoresis, haemagglutination and complement fixation microtest. This variation in cross reaction responses suggest that these antigens (D-PPC) share common structures but at the same time must have some different component owned by each one of the fungi which makes them more specific than crude antigens.

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Authors and Affiliations

  1. Departamento de Ecología Humana, Facultad de Medicina, U.N.A.M., México 20, D.F.

    M. R. Reyes-Montes, A. Martínez, C. Toriello & M. L. Taylor

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  1. M. R. Reyes-Montes
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  2. A. Martínez
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  3. C. Toriello
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  4. M. L. Taylor
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Reyes-Montes, M.R., Martínez, A., Toriello, C. et al. Antigens from Histoplasma capsulatum and Blastomyces dermatitidis . Mycopathologia 78, 17–23 (1982). https://doi.org/10.1007/BF00436577

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