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V(D) J la inducción de la recombinasa en los linfocitos B esplenos es inhibida por la señalización del
M Hertz1, V Kouskoff, T Nakamura
1National Jewish Medical and Research Center, Division of Basic Sciences, Department of Pediatrics, Denver, Colorado 80206, USA.
Nature
|July 31, 1998
Resumen
La señalización del receptor de antígeno de células B (BCR) regula la recombinación del ADN en los linfocitos B. Este proceso, conocido como recombinación V(D) J, es crucial para la tolerancia y respuesta inmunológica, pero su inducción difiere entre las células inmaduras y maduras.
Área de la Ciencia:
- Inmunología Inmunología.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- Los linfocitos utilizan la recombinación del ADN para generar genes de antígeno-receptor.
- La edición de receptores, una reinducción de la recombinación del ADN, modifica la especificidad del receptor de antígenos.
- La señalización del receptor de antígeno de células B (BCR) en linfocitos B inmaduros promueve la tolerancia inmune a través de la edición del receptor.
Objetivo del estudio:
- Para investigar el papel de la señalización de BCR en la recombinación V(D) J en células B maduras.
- Para determinar cómo la avidez por antígenos influye en la recombinación V(D) J durante las respuestas inmunes.
- Para dilucidar la regulación diferencial de la recombinación V(D) J por la señalización BCR en la tolerancia y la inmunidad.
Principales métodos:
- Estimulación de las células B esplénicas maduras con interleucina-4 y lipopolisacáridos.
- Investigando el efecto de la ligadura de BCR en la recombinación V(D) J. Investigando el efecto de la ligadura de BCR en la recombinación V(D) J.
- Inmunización de ratones transgénicos de inmunoglobulina con ligandos de diferentes ávididades para el BCR.
Principales resultados:
- La ligadura de BCR inhibe activamente la recombinación V(D) J inducida por la interleucina-4 y el lipopolisacárido en las células B maduras.
- La unión del antígeno de baja avidez al BCR indujo una fuerte recombinación V (D) J en células B maduras.
- Los ligandos no vinculantes o de alta avidez no indujeron la recombinación V (((D) J.
Conclusiones:
- La señalización de BCR regula diferencialmente la recombinación V(D) J en la tolerancia inmune y la inmunidad.
- V(D) La recombinación de J en células B maduras es inducida por una reactividad débil del antígeno, lo que potencialmente mejora la afinidad del receptor y promueve la respuesta inmune.
- La señalización BCR actúa como un regulador crítico de la recombinación V(D) J, influyendo en el destino de las células B tanto en la tolerancia como en la inmunidad activa.
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