Superantígenos del operón egc. Efectos sobre células de la inmunidad innata
Bacterial superantigens (SAgs) are enterotoxins that bind to MHC-II and TCR molecules, activating as much as 20 % of the T cell population and promoting a cytokine storm which drives to endotoxic shock, causing immunosuppression and hindering the immune response against bacterial infection. Since mo...
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| Formato: | Tesis doctoral acceptedVersion |
| Lenguaje: | Español |
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Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica
2020
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| Acceso en línea: | http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=posgraafa&cl=CL1&d=HWA_6378 https://repositoriouba.sisbi.uba.ar/gsdl/collect/posgraafa/index/assoc/HWA_6378.dir/6378.PDF |
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I28-R145-HWA_6378 |
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I28-R145-HWA_63782025-07-11 Bacterial superantigens (SAgs) are enterotoxins that bind to MHC-II and TCR molecules, activating as much as 20 % of the T cell population and promoting a cytokine storm which drives to endotoxic shock, causing immunosuppression and hindering the immune response against bacterial infection. Since monocytes/macrophages, neutrophils and ?? T cells are the firsts cells SAgs find in infected host and considering the effect of these cells have on directing the immune response, here, we investigated the effect of four non-classical SAgs encoded in the staphylococcal egc operon, namely, SEG, SEI, SEM and SEO on these subsets of innate immune cells. We found that egc SAgs depleted the pool of innate immune effector cells inducing an inefficient activation of monocytic/macrophagic cells, at the same time that induced activation as well as death of neutrophils and ?? T cells, driving the immune response to an impaired proinflammatory profile. Additionally, we proved that part of the effects is mediated directly or indirectly by interactions with MHC-II. In addition, performing surface plasmon resonance assays (SPR), we demonstrated that non-classical SAgs bind the gp130 molecule, which is ubiquitously present in several populations of innate cells. Fil: Noli Truant, Sofía. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Buenos Aires, Argentina Fernández, Marisa M. Noli Truant, Sofía 2020-03-16 Histocompatibilidad de clase II (CMH-II) y al receptor para antígenos de linfocitos T (TCR) simultáneamente, estimulando hasta un 20 % de la población de linfocitos T (LT) y promoviendo una tormenta de citoquinas que desencadena un shock tóxico, causando inmunosupresión y entorpeciendo la respuesta inmune contra la infección bacteriana. Estas toxinas también participan en la patogenia de envenenamientos alimenticios y procesos autoinmunes. Dado que los monocitos/macrófagos, neutrófilos y linfocitos T ??, son las primeras células con las que los SAgs se encuentran, y teniendo en cuenta el efecto que ellas tienen en el desarrollo de la respuesta inmune, en esta Tesis se investigó el efecto de SAgs no clásicos del operón estafilocócico egc, SEG, SEI, SEM y SEO sobre poblaciones de células inmune innatas. Se observó que los SAgs del egc depletan la población de células efectoras de la respuesta innata, induciendo un activación ineficiente de monocitos/macrófagos, y generando tanto activación como muerte en neutrófilos y linfocitos T ??, originando un respuesta inmune inflamatoria pero tolerogénica para la bacteria. Además, se comprobó que el CMH-II media parte de estas respuestas, y que existe interacción directa con gp130, un receptor expresado ubicuamente por distintas poblaciones inmunes. application/pdf Power, Pablo Trevani, Analia Goldman, Alejandra spa Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ Ciencias de la vida Doctora de la Universidad de Buenos Aires en Ciencias Bioquímicas Superantígenos del operón egc. Efectos sobre células de la inmunidad innata info:eu-repo/semantics/doctoralThesis info:ar-repo/semantics/tesis doctoral info:eu-repo/semantics/acceptedVersion http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=posgraafa&cl=CL1&d=HWA_6378 https://repositoriouba.sisbi.uba.ar/gsdl/collect/posgraafa/index/assoc/HWA_6378.dir/6378.PDF |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-145 |
| collection |
Repositorio Digital de la Universidad de Buenos Aires (UBA) |
| language |
Español |
| orig_language_str_mv |
spa |
| topic |
Ciencias de la vida |
| spellingShingle |
Ciencias de la vida Noli Truant, Sofía Superantígenos del operón egc. Efectos sobre células de la inmunidad innata |
| topic_facet |
Ciencias de la vida |
| description |
Bacterial superantigens (SAgs) are enterotoxins that bind to MHC-II and TCR molecules, activating as much as 20 % of the T cell population and promoting a cytokine storm which drives to endotoxic shock, causing immunosuppression and hindering the immune response against bacterial infection. Since monocytes/macrophages, neutrophils and ?? T cells are the firsts cells SAgs find in infected host and considering the effect of these cells have on directing the immune response, here, we investigated the effect of four non-classical SAgs encoded in the staphylococcal egc operon, namely, SEG, SEI, SEM and SEO on these subsets of innate immune cells. We found that egc SAgs depleted the pool of innate immune effector cells inducing an inefficient activation of monocytic/macrophagic cells, at the same time that induced activation as well as death of neutrophils and ?? T cells, driving the immune response to an impaired proinflammatory profile. Additionally, we proved that part of the effects is mediated directly or indirectly by interactions with MHC-II. In addition, performing surface plasmon resonance assays (SPR), we demonstrated that non-classical SAgs bind the gp130 molecule, which is ubiquitously present in several populations of innate cells. |
| author2 |
Fernández, Marisa M. |
| author_facet |
Fernández, Marisa M. Noli Truant, Sofía |
| format |
Tesis doctoral Tesis doctoral acceptedVersion |
| author |
Noli Truant, Sofía |
| author_sort |
Noli Truant, Sofía |
| title |
Superantígenos del operón egc. Efectos sobre células de la inmunidad innata |
| title_short |
Superantígenos del operón egc. Efectos sobre células de la inmunidad innata |
| title_full |
Superantígenos del operón egc. Efectos sobre células de la inmunidad innata |
| title_fullStr |
Superantígenos del operón egc. Efectos sobre células de la inmunidad innata |
| title_full_unstemmed |
Superantígenos del operón egc. Efectos sobre células de la inmunidad innata |
| title_sort |
superantígenos del operón egc. efectos sobre células de la inmunidad innata |
| publisher |
Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica |
| publishDate |
2020 |
| url |
http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=posgraafa&cl=CL1&d=HWA_6378 https://repositoriouba.sisbi.uba.ar/gsdl/collect/posgraafa/index/assoc/HWA_6378.dir/6378.PDF |
| work_keys_str_mv |
AT nolitruantsofia superantigenosdeloperonegcefectossobrecelulasdelainmunidadinnata |
| _version_ |
1840330166024273920 |