Induction of eryptosis by low concentrations of E. coli alpha-hemolysin

Autores
Carrizo Velasquez, Fernanda Elisabeth; Maté, Sabina María; Bakas, Laura Susana; Herlax, Vanesa Silvana
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Uropathogenic strains of Escherichia coli deliver the toxin alpha-hemolysin (HlyA) to optimize the host environment for the spread of infection. It was reported that at high concentrations, the toxin forms pores in eukaryotic membranes, leading to cell lysis, while lower concentrations have appeared to interfere with host–cell-signaling pathways causing cell death by apoptosis. Nevertheless, what is not clear is how often HlyA reaches levels that are high enough to lyse host target cells during the course of an infection. In the present investigation, we demonstrate that a low toxin concentration induces the suicidal death of erythrocytes (eryptosis), the major cell type present in blood. Eryptosis is triggered both by an increment in intracellular calcium and by ceramide. Since we have previously demonstrated that a low concentration of HlyA induces an increase in intraerythrocyte calcium, in the present experiments we have shown that this ion activates calpains, which hydrolyze skeleton proteins such as spectrin, ankyrin, protein 4.1 and the electrophoretic Band-3 species, thus resulting in morphologic changes in the erythrocytes. We furthermore observed that a low toxin concentration induced the activation of endogenous sphingomyelinases that in turn increased the amount of ceramide in erythrocyte membranes. Both spectrin proteolysis and ceramide formation may cause the exposure of phosphatidylserine on the membrane so as to trigger a macrophage engulfment of the erythrocyte. By this means eryptosis may be an advantageous mechanism for removing defective erythrocytes before hemolysis.
Fil: Carrizo Velasquez, Fernanda Elisabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Bioquímicas de La Plata ; Argentina
Fil: Maté, Sabina María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Bioquímicas de La Plata ; Argentina
Fil: Bakas, Laura Susana. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Ciencias Biológicas; Argentina
Fil: Herlax, Vanesa Silvana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Bioquímicas de La Plata ; Argentina
Materia
Eryptosis
Rtx Toxin
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/48713
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/48713
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Induction of eryptosis by low concentrations of E. coli alpha-hemolysinCarrizo Velasquez, Fernanda ElisabethMaté, Sabina MaríaBakas, Laura SusanaHerlax, Vanesa SilvanaEryptosisRtx Toxinhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Uropathogenic strains of Escherichia coli deliver the toxin alpha-hemolysin (HlyA) to optimize the host environment for the spread of infection. It was reported that at high concentrations, the toxin forms pores in eukaryotic membranes, leading to cell lysis, while lower concentrations have appeared to interfere with host–cell-signaling pathways causing cell death by apoptosis. Nevertheless, what is not clear is how often HlyA reaches levels that are high enough to lyse host target cells during the course of an infection. In the present investigation, we demonstrate that a low toxin concentration induces the suicidal death of erythrocytes (eryptosis), the major cell type present in blood. Eryptosis is triggered both by an increment in intracellular calcium and by ceramide. Since we have previously demonstrated that a low concentration of HlyA induces an increase in intraerythrocyte calcium, in the present experiments we have shown that this ion activates calpains, which hydrolyze skeleton proteins such as spectrin, ankyrin, protein 4.1 and the electrophoretic Band-3 species, thus resulting in morphologic changes in the erythrocytes. We furthermore observed that a low toxin concentration induced the activation of endogenous sphingomyelinases that in turn increased the amount of ceramide in erythrocyte membranes. Both spectrin proteolysis and ceramide formation may cause the exposure of phosphatidylserine on the membrane so as to trigger a macrophage engulfment of the erythrocyte. By this means eryptosis may be an advantageous mechanism for removing defective erythrocytes before hemolysis.Fil: Carrizo Velasquez, Fernanda Elisabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Bioquímicas de La Plata ; ArgentinaFil: Maté, Sabina María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Bioquímicas de La Plata ; ArgentinaFil: Bakas, Laura Susana. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Ciencias Biológicas; ArgentinaFil: Herlax, Vanesa Silvana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Bioquímicas de La Plata ; ArgentinaElsevier Science2015-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/48713Carrizo Velasquez, Fernanda Elisabeth; Maté, Sabina María; Bakas, Laura Susana; Herlax, Vanesa Silvana; Induction of eryptosis by low concentrations of E. coli alpha-hemolysin; Elsevier Science; Biochimica et Biophysica Acta - Biomembranes; 1848; 11; 8-2015; 2779-27880005-2736CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0005273615002631info:eu-repo/semantics/altIdentifier/doi/10.1016/j.bbamem.2015.08.012info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:30:21Zoai:ri.conicet.gov.ar:11336/48713instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 15:30:21.37CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Induction of eryptosis by low concentrations of E. coli alpha-hemolysin
title Induction of eryptosis by low concentrations of E. coli alpha-hemolysin
spellingShingle Induction of eryptosis by low concentrations of E. coli alpha-hemolysin
Carrizo Velasquez, Fernanda Elisabeth
Eryptosis
Rtx Toxin
title_short Induction of eryptosis by low concentrations of E. coli alpha-hemolysin
title_full Induction of eryptosis by low concentrations of E. coli alpha-hemolysin
title_fullStr Induction of eryptosis by low concentrations of E. coli alpha-hemolysin
title_full_unstemmed Induction of eryptosis by low concentrations of E. coli alpha-hemolysin
title_sort Induction of eryptosis by low concentrations of E. coli alpha-hemolysin
dc.creator.none.fl_str_mv Carrizo Velasquez, Fernanda Elisabeth
Maté, Sabina María
Bakas, Laura Susana
Herlax, Vanesa Silvana
author Carrizo Velasquez, Fernanda Elisabeth
author_facet Carrizo Velasquez, Fernanda Elisabeth
Maté, Sabina María
Bakas, Laura Susana
Herlax, Vanesa Silvana
author_role author
author2 Maté, Sabina María
Bakas, Laura Susana
Herlax, Vanesa Silvana
author2_role author
author
author
dc.subject.none.fl_str_mv Eryptosis
Rtx Toxin
topic Eryptosis
Rtx Toxin
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Uropathogenic strains of Escherichia coli deliver the toxin alpha-hemolysin (HlyA) to optimize the host environment for the spread of infection. It was reported that at high concentrations, the toxin forms pores in eukaryotic membranes, leading to cell lysis, while lower concentrations have appeared to interfere with host–cell-signaling pathways causing cell death by apoptosis. Nevertheless, what is not clear is how often HlyA reaches levels that are high enough to lyse host target cells during the course of an infection. In the present investigation, we demonstrate that a low toxin concentration induces the suicidal death of erythrocytes (eryptosis), the major cell type present in blood. Eryptosis is triggered both by an increment in intracellular calcium and by ceramide. Since we have previously demonstrated that a low concentration of HlyA induces an increase in intraerythrocyte calcium, in the present experiments we have shown that this ion activates calpains, which hydrolyze skeleton proteins such as spectrin, ankyrin, protein 4.1 and the electrophoretic Band-3 species, thus resulting in morphologic changes in the erythrocytes. We furthermore observed that a low toxin concentration induced the activation of endogenous sphingomyelinases that in turn increased the amount of ceramide in erythrocyte membranes. Both spectrin proteolysis and ceramide formation may cause the exposure of phosphatidylserine on the membrane so as to trigger a macrophage engulfment of the erythrocyte. By this means eryptosis may be an advantageous mechanism for removing defective erythrocytes before hemolysis.
Fil: Carrizo Velasquez, Fernanda Elisabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Bioquímicas de La Plata ; Argentina
Fil: Maté, Sabina María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Bioquímicas de La Plata ; Argentina
Fil: Bakas, Laura Susana. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Ciencias Biológicas; Argentina
Fil: Herlax, Vanesa Silvana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Bioquímicas de La Plata ; Argentina
description Uropathogenic strains of Escherichia coli deliver the toxin alpha-hemolysin (HlyA) to optimize the host environment for the spread of infection. It was reported that at high concentrations, the toxin forms pores in eukaryotic membranes, leading to cell lysis, while lower concentrations have appeared to interfere with host–cell-signaling pathways causing cell death by apoptosis. Nevertheless, what is not clear is how often HlyA reaches levels that are high enough to lyse host target cells during the course of an infection. In the present investigation, we demonstrate that a low toxin concentration induces the suicidal death of erythrocytes (eryptosis), the major cell type present in blood. Eryptosis is triggered both by an increment in intracellular calcium and by ceramide. Since we have previously demonstrated that a low concentration of HlyA induces an increase in intraerythrocyte calcium, in the present experiments we have shown that this ion activates calpains, which hydrolyze skeleton proteins such as spectrin, ankyrin, protein 4.1 and the electrophoretic Band-3 species, thus resulting in morphologic changes in the erythrocytes. We furthermore observed that a low toxin concentration induced the activation of endogenous sphingomyelinases that in turn increased the amount of ceramide in erythrocyte membranes. Both spectrin proteolysis and ceramide formation may cause the exposure of phosphatidylserine on the membrane so as to trigger a macrophage engulfment of the erythrocyte. By this means eryptosis may be an advantageous mechanism for removing defective erythrocytes before hemolysis.
publishDate 2015
dc.date.none.fl_str_mv 2015-08
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/48713
Carrizo Velasquez, Fernanda Elisabeth; Maté, Sabina María; Bakas, Laura Susana; Herlax, Vanesa Silvana; Induction of eryptosis by low concentrations of E. coli alpha-hemolysin; Elsevier Science; Biochimica et Biophysica Acta - Biomembranes; 1848; 11; 8-2015; 2779-2788
0005-2736
CONICET Digital
CONICET
url http://hdl.handle.net/11336/48713
identifier_str_mv Carrizo Velasquez, Fernanda Elisabeth; Maté, Sabina María; Bakas, Laura Susana; Herlax, Vanesa Silvana; Induction of eryptosis by low concentrations of E. coli alpha-hemolysin; Elsevier Science; Biochimica et Biophysica Acta - Biomembranes; 1848; 11; 8-2015; 2779-2788
0005-2736
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0005273615002631
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.bbamem.2015.08.012
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.22299

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