Biochemical analysis of the methylic antigen of Paracoccidioides brasiliensis Análise bioquímica de antígeno metílico de Paracoccidioides brasiliensis
Yeast forms of five strains of Paracoccidioides brasiliensis (SN, 2, 18, 192 and JT- 1) were cultured in a synthetic medium for obtaining methylic antigens. These antigens were lyophilized and studied for each strain, to determine their partial biochemical composition, through measurements of total...
| Published in: | Revista do Instituto de Medicina Tropical de São Paulo |
|---|---|
| Main Authors: | , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Universidade de São Paulo (USP)
1992
|
| Subjects: | |
| Online Access: | https://doi.org/10.1590/S0036-46651992000600004 https://doaj.org/article/66511b77707f4d5f885de510cb1c63bf |
| Summary: | Yeast forms of five strains of Paracoccidioides brasiliensis (SN, 2, 18, 192 and JT- 1) were cultured in a synthetic medium for obtaining methylic antigens. These antigens were lyophilized and studied for each strain, to determine their partial biochemical composition, through measurements of total lipid, protein and carbohydrate contents. Lipids of methylic antigens were purified and analysed for sterols, phospholipids, glycolipids, li-poproteins, and partial characterization of sterols. Significant differences were found among antigenic preparations derived from distinct P. brasiliensis strains, in relation to the quantitative determinations. On the other hand, sterol analysis revealed the presence of ergosterol, lanosterol and squalene in all samples. The diversity verified in the biochemical characteristics of antigens derived from different P. brasiliensis strains, confirm the need of using a pool of fungal samples in order to produce antigen preparations for serological procedures without hampering their sensitivity. Cinco amostras de Paracoccidioides brasiliensis (SN, 2, 18, 192 e JT-1) em fase leveduriforme foram cultivadas em meio sintético para obtenção de antígenos metílicos. Os antígenos provenientes de cada amostra foram liofilizados e analisados quanto à sua composição bioquímica parcial, através da determinação do conteúdo total de lipídios, proteínas e carboidratos. Os lipídios dos antígenos metílicos foram purificados e analisados quanto ao teor de esterois, fosfolipídios, glicolipídios e lipoproteínas. Esterois foram parcialmente caracterizados. Em relação às medidas quantitativas, foram encontradas diferenças significantes entre as preparações antigênicas provenientes de amostras distintas de P. brasiliensis. Por outro lado, a análise dos esterois revelou a presença de ergosterol, lanosterol e esqualeno em todas as preparações. As diferenças verificadas nas características bioquímicas de antígenos derivados de amostras diferentes de P. brasiliensis confirmam a necessidade do uso de um pool de ... |
|---|