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Introducción de proteínas solubles en la vía de clase I de procesamiento y presentación de antígenos

M W Moore¹, F R Carbone, M J Bevan

¹Department of Immunology, Research Institute of Scripps Clinic, La Jolla, California 92037.

|September 9, 1988

Resumen

Los linfocitos T citotóxicos (CTL) reconocen péptidos presentados por moléculas de clase I del complejo mayor de histocompatibilidad (MHC). La introducción de ovalbumina (OVA) directamente en el citoplasma celular, pero no extracelularmente, sensibilizó a las células para la lisis de CTL, revelando las vías de procesamiento de péptidos intracelulares.

Área de la Ciencia:

Inmunología Inmunología.
Biología Molecular Biología Molecular
Biología celular Biología celular.

Sus antecedentes:

Las glicoproteínas del complejo mayor de histocompatibilidad (MHC) de clase I presentan péptidos intracelulares a los linfocitos T citotóxicos (CTL).
Comprender los mecanismos intracelulares de asociación de péptidos con MHC clase I es crucial para la inmunidad adaptativa y el desarrollo de vacunas.

Objetivo del estudio:

Investigar las vías intracelulares por las cuales los péptidos se asocian con las moléculas MHC de clase I.
Para determinar cómo el procesamiento y la presentación del antígeno influyen en el reconocimiento de CTL.

Principales métodos:

Generación de CTLs restringidas por H-2Kb específicas para el péptido OVA258-276 en ratones C57BL/6.
En ensayos in vitro se utilizan péptidos sintéticos de OVA, fragmentos de CNBr y OVA nativo para sensibilizar las células diana para la lisis mediada por CTL.
Entrega intracelular de OVA a través de la lisis osmótica de los pinosomas.

Principales resultados:

El péptido sintético de OVA (258-276) y los fragmentos de OVA (242-285, 242-273) sensibilizaron las células H-2b para la lisis por CTLs específicos.
La incubación con OVA nativo durante hasta 24 horas no sensibilizó las células para el reconocimiento.
La administración citoplasmática directa de OVA condujo a la formación del determinante restringido por H-2Kb, sensibilizando a las células para la lisis.

Conclusiones:

El procesamiento intracelular y la presentación de antígenos son críticos para la formación de complejos peptídicos de clase I del MHC reconocidos por las CTL.
La ruta de entrada del antígeno tiene un impacto significativo en su procesamiento y posterior presentación en moléculas de clase I de MHC.
La entrega citoplasmática pasa por alto las barreras de procesamiento extracelular, lo que permite una presentación eficiente del epítopo OVA258-276.

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