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Diversity of Antigen Receptors01:28

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Updated: Jun 19, 2026

Use of Single Chain MHC Technology to Investigate Co-agonism in Human CD8+ T Cell Activation
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Published on: February 28, 2019

La competencia intracelular por las cadenas de componentes determina el fenotipo de la superficie celular MHC clase

A J Sant1, R N Germain

  • 1Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland 20892.

Cell
|June 2, 1989
PubMed
Resumen

Los dímeros de isotipos mixtos no se encuentran típicamente en las células hematopoyéticas. Sin embargo, la síntesis asimétrica de cadenas alfa y beta de clase II puede conducir a su expresión significativa en las superficies celulares.

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09:32

Immunopeptidomics: Isolation of Mouse and Human MHC Class I- and II-Associated Peptides for Mass Spectrometry Analysis

Published on: October 15, 2021

Área de la Ciencia:

  • Inmunogenética La inmunogenética.
  • Inmunología molecular inmunología molecular.
  • Inmunología celular Inmunología celular.

Sus antecedentes:

  • Los dímeros de isotipos mixtos (por ejemplo, E alfa A beta, A alfa E beta) generalmente están ausentes de las células hematopoyéticas Ia+.
  • Algunos dímeros de isotipos mixtos pueden expresarse en la superficie de células transfectadas que contienen solo los genes necesarios de clase II.

Objetivo del estudio:

  • Para investigar las razones detrás de la expresión diferencial de los isotipos mixtos dimers.
  • Para comparar la expresión superficial de los Ia-dimeros individuales con las cadenas de clase II disponibles en un modelo celular.
  • Comprender el papel de la competencia en cadena en la expresión de Ia molécula.

Principales métodos:

  • Utilizó un modelo de transfección de células L para simular la síntesis de cadenas alfa y beta de clase II equilibrada y asimétrica.
  • Comparación de la expresión superficial de los dímeros Ia específicos (A alfa A beta, E alfa E beta, E alfa A beta) bajo diferentes condiciones de síntesis.
  • Cadenas de clase II cuantificadas disponibles dentro de las células transfectadas.

Principales resultados:

  • Las especies predominantes A alfa A beta y E alfa E beta muestran preferencias de 3 a 5 veces en el montaje o el transporte.
  • Estas preferencias normalmente impiden la expresión de los isotipos mixtos E alfa A beta dimeros bajo síntesis de cadena equilibrada.
  • La síntesis de cadena asimétrica permite una expresión superficial biológicamente significativa de dímeros de isotipo mixto.

Conclusiones:

  • La competencia en la cadena y la cinética diferencial de ensamblaje/transporte influyen en la expresión superficial de Ia dimer.
  • Las condiciones fisiológicas con síntesis de cadena equilibrada favorecen a los homodímeros sobre los heterodímeros.
  • Las relaciones de síntesis de cadena alteradas pueden superar las preferencias inherentes, lo que permite la presentación de dímeros de isotipo mixto.