Efecto localizado y sistémico de Superantígenos del grupo II. Evaluación de la resistencia al tratamiento convencional

Superantigens (SAgs) are proteins that generate an exacerbated activation of the immune response throughout the stabilization of the interaction between TCR and MHC-II. Differential biological behavior and interaction with chain mV?8.2 has been described for SEG (Fernández 2006, 2007,2011). As Hypot...

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Autor principal: Fernández Lynch, María Julieta
Otros Autores: Fernández, Marisa Mariel
Formato: Tesis doctoral acceptedVersion
Lenguaje:Español
Publicado: 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_6717
https://repositoriouba.sisbi.uba.ar/gsdl/collect/posgraafa/index/assoc/HWA_6717.dir/6717.PDF
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spelling I28-R145-HWA_67172025-06-25 Superantigens (SAgs) are proteins that generate an exacerbated activation of the immune response throughout the stabilization of the interaction between TCR and MHC-II. Differential biological behavior and interaction with chain mV?8.2 has been described for SEG (Fernández 2006, 2007,2011). As Hypothesis of this Thesis, it was proposed that the new residues characterized in this interaction are responsible for this differential biological activity and that the activation of the TCR would generate resistance to glucocorticoids (GCs). Through in silico, in vitro and in vivo experiments, hot spot residues of the interface were characterized by obtaining single point mutant proteins with lower or zero affinities for mV?8.2. Resistance to GCs was reported for group II SAgs (SEG, SER, SEC3, SSA) and the egc operon (SEI, SEO). The importance of TCR, PI3K and NF?B activation was demonstrated. The effective use of Compound A was reported. The interaction with CD28 and B7 was described for classic SAgs (Arad 2011; Levy 2016), but no interaction by SPR was recorded for SEG with CD28. The modeling of the complexes suggests a potential interaction of SEG with B7.2. The knowledge generated allows the development of therapies and immunomodulators based on modified SAgs. Fil: Fernández Lynch, María Julieta. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Buenos Aires, Argentina Fernández, Marisa Mariel Fernández Lynch, María Julieta 2020-12-16 Los superantígenos (SAgs) son proteínas que generan activación desmedida de la respuesta inmune estabilizando la interacción entre TCR y CMH-II. SEG presenta un comportamiento biológico e interacción diferencial con la cadena mV?8.2 (Fernández 2006, 2007,2011). Se planteó como Hipótesis de esta Tesis que los nuevos residuos caracterizados en esta interacción son los responsables de esta actividad biológica diferencial y que la activación del TCR generaría resistencia a los glucocorticoides (GCs). Mediante experimentos in silico, in vitro e in vivo se caracterizó los residuos hot spot de la interfase mediante la obtención de proteínas mutantes puntuales con afinidades menores o nulas por mV?8.2. Se reportó la resistencia a GCs para SAgs del grupo II (SEG, SER, SEC3, SSA) y del operón egc (SEI, SEO). Se demostró la importancia de la activación del TCR, PI3K y NF?B. Se reportó el empleo efectivo del Compound A. La interacción con CD28 y B7 fue descripta para SAgs clásicos (Arad 2011; Levy 2016), pero, no se registró interacción por SPR para SEG con CD28. El modelado de los complejos sugiriere una potencial interacción de SEG con B7.2. El conocimiento generado permite el desarrollo de terapias e inmunomoduladores basados en SAgs modificados. application/pdf Curto, Lucrecia Camperi, Silvia Di Genaro, María Silvia Superantígenos Glucocorticoides 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 Efecto localizado y sistémico de Superantígenos del grupo II. Evaluación de la resistencia al tratamiento convencional 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_6717 https://repositoriouba.sisbi.uba.ar/gsdl/collect/posgraafa/index/assoc/HWA_6717.dir/6717.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 Superantígenos
Glucocorticoides
Ciencias de la vida
spellingShingle Superantígenos
Glucocorticoides
Ciencias de la vida
Fernández Lynch, María Julieta
Efecto localizado y sistémico de Superantígenos del grupo II. Evaluación de la resistencia al tratamiento convencional
topic_facet Superantígenos
Glucocorticoides
Ciencias de la vida
description Superantigens (SAgs) are proteins that generate an exacerbated activation of the immune response throughout the stabilization of the interaction between TCR and MHC-II. Differential biological behavior and interaction with chain mV?8.2 has been described for SEG (Fernández 2006, 2007,2011). As Hypothesis of this Thesis, it was proposed that the new residues characterized in this interaction are responsible for this differential biological activity and that the activation of the TCR would generate resistance to glucocorticoids (GCs). Through in silico, in vitro and in vivo experiments, hot spot residues of the interface were characterized by obtaining single point mutant proteins with lower or zero affinities for mV?8.2. Resistance to GCs was reported for group II SAgs (SEG, SER, SEC3, SSA) and the egc operon (SEI, SEO). The importance of TCR, PI3K and NF?B activation was demonstrated. The effective use of Compound A was reported. The interaction with CD28 and B7 was described for classic SAgs (Arad 2011; Levy 2016), but no interaction by SPR was recorded for SEG with CD28. The modeling of the complexes suggests a potential interaction of SEG with B7.2. The knowledge generated allows the development of therapies and immunomodulators based on modified SAgs.
author2 Fernández, Marisa Mariel
author_facet Fernández, Marisa Mariel
Fernández Lynch, María Julieta
format Tesis doctoral
Tesis doctoral
acceptedVersion
author Fernández Lynch, María Julieta
author_sort Fernández Lynch, María Julieta
title Efecto localizado y sistémico de Superantígenos del grupo II. Evaluación de la resistencia al tratamiento convencional
title_short Efecto localizado y sistémico de Superantígenos del grupo II. Evaluación de la resistencia al tratamiento convencional
title_full Efecto localizado y sistémico de Superantígenos del grupo II. Evaluación de la resistencia al tratamiento convencional
title_fullStr Efecto localizado y sistémico de Superantígenos del grupo II. Evaluación de la resistencia al tratamiento convencional
title_full_unstemmed Efecto localizado y sistémico de Superantígenos del grupo II. Evaluación de la resistencia al tratamiento convencional
title_sort efecto localizado y sistémico de superantígenos del grupo ii. evaluación de la resistencia al tratamiento convencional
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_6717
https://repositoriouba.sisbi.uba.ar/gsdl/collect/posgraafa/index/assoc/HWA_6717.dir/6717.PDF
work_keys_str_mv AT fernandezlynchmariajulieta efectolocalizadoysistemicodesuperantigenosdelgrupoiievaluaciondelaresistenciaaltratamientoconvencional
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