Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/197430
Type: Artigo de periódico
Title: Production Of Monoclonal Antibodies For Detection Of A Secreted Aspartyl Proteinase From Candida Spp. In Biologic Specimens.
Author: Rodrigues, Janaina Aparecida De Oliveira
Höfling, José Francisco
Azevedo, Ricardo Antunes
Gabriel, Dirce Lima
Tamashiro, Wirla Maria Da Silva Cunha
Abstract: Secreted acid proteinases (SAP) constitute an important group of virulence factors in Candida albicans. In the present work, an acid proteinase from C. albicans was sequentially purified from the supernatant of a yeast culture by precipitation with ammonium sulfate, ion exchange chromatography, and molecular exclusion chromatography, yielding a specific enzymatic activity of 204.1 IU/mg on bovine serum albumin (BSA). The molecular mass of the purified proteinase was estimated at 43 kd after exclusion chromatography and at 41 kd by nondenaturating sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). The purified proteinase was able to degrade BSA at pH 2.5, but was not active on collagen, and it was significantly inhibited by pepstatin A. The immunization of BALB/c mice with the purified proteinase and later fusion of their spleen cells with myeloma cells resulted in 19 monoclonal antibody secreting hybridomas (MAbs) capable of detecting SAP in enzyme-linked immunosorbent assay (ELISA) assays. All MAbs obtained are isotype IgG1 kappa (kappa) immunoglobulins and develop a 41 kd protein band by Western blot (WB) in samples of SAP obtained from C. albicans (12-A) and C. dubliniensis (strain 778) crude extracts. The anti-SAP MAbs were used in capture ELISA and two combinations of these antibodies proved suitable for SAP detection, that is, MAP1 (1B1B3) or MAP2 (2D2C10) as coat antibodies, and biotinylated MAP3 (2A6E8) as detect antibody. Capture ELISA using these sets of MAbs detected over 32 ng/mL protein in purified SAP samples as well as in crude C. albicans and C. dubliniensis extracts. The results herein obtained allow for the prediction of how this set of antibodies can be useful for SAP detection in biologic specimens.
Subject: Animals
Antibodies, Monoclonal
Antibody Specificity
Antigen-antibody Reactions
Aspartic Acid Endopeptidases
Candida
Candida Albicans
Enzyme-linked Immunosorbent Assay
Female
Hybridomas
Immunoglobulin G
Mice
Mice, Inbred Balb C
Rights: fechado
Identifier DOI: 10.1089/hyb.2007.007
Address: http://www.ncbi.nlm.nih.gov/pubmed/17725381
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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