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Defectos del gen de la perforina en la linfohistiocitosis hemofagocítica familiar
S E Stepp1, R Dufourcq-Lagelouse, F Le Deist
1Department of Pathology and the Graduate Program in Immunology, University of Texas Southwestern Medical School, Dallas, TX 75235, USA.
Science (New York, N.Y.)
|December 3, 1999
Resumen
La linfohistiocitosis hemofagocítica familiar (LHF) es un trastorno inmunológico grave. Los defectos genéticos en el gen de la perforina causan FHL vinculado al cromosoma 10q21-22, deteriorando la actividad citotóxica.
Área de la Ciencia:
- Inmunología Inmunología.
- Genética La genética.
- Biología celular Biología celular.
Sus antecedentes:
- La linfohistiocitosis hemofagocítica familiar (LHF) es un trastorno inmunológico autosómico recesivo raro y fatal.
- Implica la activación incontrolada de células T y macrófagos con una producción excesiva de citoquinas.
- FHL exhibe heterogeneidad genética, con loci vinculados a 9q21.3-22, 10q21-22 y otras regiones.
Objetivo del estudio:
- Para investigar la base genética de la LHF vinculada al locus 10q21-22.
- Para determinar el papel del gen de la perforina en esta forma específica de FHL.
Principales métodos:
- Análisis de vínculo genético para identificar los loci de FHL.
- Secuenciación de las regiones codificantes del gen de la perforina en pacientes con LHF.
- Evaluación de la actividad citotóxica de los linfocitos.
- Inmunostaining para la expresión de perforina en gránulos de linfocitos.
Principales resultados:
- Se estudiaron ocho pacientes con FHL no relacionados vinculados a 10q21-22.
- Cuatro pacientes tenían mutaciones homocigotas sin sentido, y cuatro tenían mutaciones sin sentido en el gen de la perforina.
- Los linfocitos del paciente mostraron una actividad citotóxica defectuosa.
- La inmunostabilización mostró una reducción significativa o ausencia de perforina en los gránulos de los linfocitos.
Conclusiones:
- Los defectos genéticos de la perforina son la causa de la FHL vinculada al locus 10q21-22.
- La perforina es crucial para las funciones del efector citotóxico, incluida la lisis de las células diana.
- Las vías mediadas por la perforina son esenciales para regular las respuestas inmunes celulares.
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