Treatment of serum with supernatants from cultures of Candida albicans reduces its serum-dependent phagocytosis
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Microbiology |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000100016 |
Resumo: | Candida albicans is a potent activator of the complement system, and heat labile opsonins produced by activation of C3 (C3b and iC3b) enhance phagocytosis of C. albicans mediated by complement receptors. In this study we treated mouse serum with supernatants from cultures of a protease producer strain of C. albicans and evaluated the ability of this serum to enhance phagocytosis of C. albicans. Cell-free supernatants from cultures of C. albicans were concentrated 5 fold and added to mouse serum for 30 min at 37ºC, before using this serum for opsonization of glutaraldehyde-fixed yeast cells. We observed that normal mouse serum increased about 3 fold the phagocytosis of C. albicans by mice peritoneal macrophages, whereas supernatant-treated serum did not increase phagocytosis. This effect of supernatants on serum was prevented by addition of pepstatin (5 µg/ ml; an inhibitor of C. albicans acid proteases) to the medium. Serum treated with supernatants from cultures of a protease-deficient mutant of C. albicans also increased about 3 fold phagocytosis of the yeast. These results suggest that a protease produced by C. albicans causes proteolysis of serum opsonins, thereby reducing the phagocytosis of the yeast. |
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Brazilian Journal of Microbiology |
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Treatment of serum with supernatants from cultures of Candida albicans reduces its serum-dependent phagocytosisCandida albicansphagocytosisproteinaseCandida albicans is a potent activator of the complement system, and heat labile opsonins produced by activation of C3 (C3b and iC3b) enhance phagocytosis of C. albicans mediated by complement receptors. In this study we treated mouse serum with supernatants from cultures of a protease producer strain of C. albicans and evaluated the ability of this serum to enhance phagocytosis of C. albicans. Cell-free supernatants from cultures of C. albicans were concentrated 5 fold and added to mouse serum for 30 min at 37ºC, before using this serum for opsonization of glutaraldehyde-fixed yeast cells. We observed that normal mouse serum increased about 3 fold the phagocytosis of C. albicans by mice peritoneal macrophages, whereas supernatant-treated serum did not increase phagocytosis. This effect of supernatants on serum was prevented by addition of pepstatin (5 µg/ ml; an inhibitor of C. albicans acid proteases) to the medium. Serum treated with supernatants from cultures of a protease-deficient mutant of C. albicans also increased about 3 fold phagocytosis of the yeast. These results suggest that a protease produced by C. albicans causes proteolysis of serum opsonins, thereby reducing the phagocytosis of the yeast.Sociedade Brasileira de Microbiologia2002-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000100016Brazilian Journal of Microbiology v.33 n.1 2002reponame:Brazilian Journal of Microbiologyinstname:Sociedade Brasileira de Microbiologia (SBM)instacron:SBM10.1590/S1517-83822002000100016info:eu-repo/semantics/openAccessSantos,Aderbal Antonio dosSá,Eglius Alexandre Colignese deGaziri,Luis Carlos JaburFelipe,Ioniceeng2002-09-16T00:00:00Zoai:scielo:S1517-83822002000100016Revistahttps://www.scielo.br/j/bjm/ONGhttps://old.scielo.br/oai/scielo-oai.phpbjm@sbmicrobiologia.org.br||mbmartin@usp.br1678-44051517-8382opendoar:2002-09-16T00:00Brazilian Journal of Microbiology - Sociedade Brasileira de Microbiologia (SBM)false |
dc.title.none.fl_str_mv |
Treatment of serum with supernatants from cultures of Candida albicans reduces its serum-dependent phagocytosis |
title |
Treatment of serum with supernatants from cultures of Candida albicans reduces its serum-dependent phagocytosis |
spellingShingle |
Treatment of serum with supernatants from cultures of Candida albicans reduces its serum-dependent phagocytosis Santos,Aderbal Antonio dos Candida albicans phagocytosis proteinase |
title_short |
Treatment of serum with supernatants from cultures of Candida albicans reduces its serum-dependent phagocytosis |
title_full |
Treatment of serum with supernatants from cultures of Candida albicans reduces its serum-dependent phagocytosis |
title_fullStr |
Treatment of serum with supernatants from cultures of Candida albicans reduces its serum-dependent phagocytosis |
title_full_unstemmed |
Treatment of serum with supernatants from cultures of Candida albicans reduces its serum-dependent phagocytosis |
title_sort |
Treatment of serum with supernatants from cultures of Candida albicans reduces its serum-dependent phagocytosis |
author |
Santos,Aderbal Antonio dos |
author_facet |
Santos,Aderbal Antonio dos Sá,Eglius Alexandre Colignese de Gaziri,Luis Carlos Jabur Felipe,Ionice |
author_role |
author |
author2 |
Sá,Eglius Alexandre Colignese de Gaziri,Luis Carlos Jabur Felipe,Ionice |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Santos,Aderbal Antonio dos Sá,Eglius Alexandre Colignese de Gaziri,Luis Carlos Jabur Felipe,Ionice |
dc.subject.por.fl_str_mv |
Candida albicans phagocytosis proteinase |
topic |
Candida albicans phagocytosis proteinase |
description |
Candida albicans is a potent activator of the complement system, and heat labile opsonins produced by activation of C3 (C3b and iC3b) enhance phagocytosis of C. albicans mediated by complement receptors. In this study we treated mouse serum with supernatants from cultures of a protease producer strain of C. albicans and evaluated the ability of this serum to enhance phagocytosis of C. albicans. Cell-free supernatants from cultures of C. albicans were concentrated 5 fold and added to mouse serum for 30 min at 37ºC, before using this serum for opsonization of glutaraldehyde-fixed yeast cells. We observed that normal mouse serum increased about 3 fold the phagocytosis of C. albicans by mice peritoneal macrophages, whereas supernatant-treated serum did not increase phagocytosis. This effect of supernatants on serum was prevented by addition of pepstatin (5 µg/ ml; an inhibitor of C. albicans acid proteases) to the medium. Serum treated with supernatants from cultures of a protease-deficient mutant of C. albicans also increased about 3 fold phagocytosis of the yeast. These results suggest that a protease produced by C. albicans causes proteolysis of serum opsonins, thereby reducing the phagocytosis of the yeast. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000100016 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000100016 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S1517-83822002000100016 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Microbiologia |
publisher.none.fl_str_mv |
Sociedade Brasileira de Microbiologia |
dc.source.none.fl_str_mv |
Brazilian Journal of Microbiology v.33 n.1 2002 reponame:Brazilian Journal of Microbiology instname:Sociedade Brasileira de Microbiologia (SBM) instacron:SBM |
instname_str |
Sociedade Brasileira de Microbiologia (SBM) |
instacron_str |
SBM |
institution |
SBM |
reponame_str |
Brazilian Journal of Microbiology |
collection |
Brazilian Journal of Microbiology |
repository.name.fl_str_mv |
Brazilian Journal of Microbiology - Sociedade Brasileira de Microbiologia (SBM) |
repository.mail.fl_str_mv |
bjm@sbmicrobiologia.org.br||mbmartin@usp.br |
_version_ |
1752122199258431488 |