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Un péptido antigénico producido por el empalme de péptidos en el proteosoma

Nathalie Vigneron¹, Vincent Stroobant, Jacques Chapiro

¹Ludwig Institute for Cancer Research and Cellular Genetics Unit, Université de Louvain, B-1200 Brussels, Belgium.

Science (New York, N.Y.)

|March 6, 2004

Resumen

Los linfocitos T CD8 reconocen los péptidos del melanoma producidos por el empalme del proteasoma. Este nuevo mecanismo implica unir fragmentos de proteínas no contiguas para crear péptidos antigénicos únicos para el reconocimiento inmune.

Área de la Ciencia:

Inmunología Inmunología.
Biología Molecular Biología Molecular
Investigación de Investigación del Cáncer.

Sus antecedentes:

Los linfocitos T CD8 son cruciales para la inmunidad adaptativa, reconociendo los antígenos péptidos presentados por las moléculas de clase I del MHC.
La presentación del antígeno típicamente implica péptidos lineales derivados de la degradación de las proteínas.

Objetivo del estudio:

Para investigar la naturaleza precisa de los péptidos antigénicos reconocidos por los linfocitos T CD8 en el melanoma.
Para dilucidar el mecanismo de la producción de péptidos antigénicos en el contexto del melanoma.

Principales métodos:

Análisis del reconocimiento de péptidos por linfocitos T CD8 en células de melanoma.
Reconstitución in vitro de la producción de péptidos utilizando proteasomas purificados.
Caracterización bioquímica del mecanismo de empalme de péptidos.

Principales resultados:

Identificó un péptido no americano reconocido por los linfocitos T CD8 en las células de melanoma.
Este péptido comprende dos segmentos no contiguos de la glicoproteína melanocítica gp100 ((PMEL17).
Se demostró que los proteasomas pueden extirpar aminoácidos y empalmar fragmentos de péptidos, un proceso reproducible in vitro.

Conclusiones:

Las células de melanoma presentan un péptido nonameric empalmado derivado de gp100(PMEL17) a los linfocitos T CD8.
Los proteasomas poseen una función inesperada en la generación de péptidos antigénicos empalmados a través de la transpeptidación.
Este descubrimiento revela una nueva vía en el procesamiento de antígenos y el reconocimiento de células T relevantes para la inmunología del cáncer.

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