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Reversión del compromiso de las células B tras la pérdida de la expresión de Pax5
Ingvild Mikkola1, Barry Heavey, Markus Horcher
1Research Institute of Molecular Pathology, Vienna Biocenter, Dr. Bohr-Gasse 7, A-1030 Vienna, Austria.
Science (New York, N.Y.)
|July 6, 2002
Resumen
El factor de transcripción Pax5 es crucial para el desarrollo de las células B. Su expresión continua es necesaria para mantener el compromiso de las células B, evitando que las células B tempranas se conviertan en otros tipos de células sanguíneas.
Área de la Ciencia:
- Inmunología Inmunología.
- Biología del desarrollo Biología del desarrollo.
- La hematopoyesis es la hematopoyesis.
Sus antecedentes:
- El factor de transcripción Pax5 inicia el compromiso de la línea de células B.
- El papel de Pax5 en el mantenimiento del compromiso de las células B no se entiende bien.
Objetivo del estudio:
- Investigar el papel de Pax5 en el mantenimiento del compromiso con el linaje de células B durante el desarrollo temprano.
- Para determinar si Pax5 se requiere continuamente para la identidad de la célula B.
Principales métodos:
- La inactivación condicional del gen Pax5 en las células pro-B comprometidas.
- Pruebas de diferenciación in vitro para evaluar el potencial de los macrófagos.
- Ensayos de reconstitución in vivo en ratones RAG2-/- para evaluar la capacidad de desarrollo de células T.
Principales resultados:
- La inactivación condicional de Pax5 en las células pro-B condujo a la pérdida de la iniciación y el mantenimiento del programa de transcripción de células B.
- Las células pro-B deficientes en Pax5 recuperaron la capacidad de diferenciarse en macrófagos in vitro.
- Estas células también podrían reconstituir el desarrollo de células T in vivo en ratones RAG2-/- .
Conclusiones:
- La expresión de Pax5 se requiere continuamente para mantener el compromiso con el linaje de células B.
- La pérdida de Pax5 convierte a las células pro-B comprometidas en progenitores hematopoyéticos con potencial multilineado.
- Pax5 es esencial para mantener la identidad de las células B durante el desarrollo temprano.
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