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Una macromolécula lavable de la médula Fv2rr regula negativamente la síntesis de ADN en las células progenitoras
Cell
|October 1, 1981
Resumen
Un factor genético en ratones controla la eritropoiesis mediante la regulación de un regulador de crecimiento negativo para los precursores tempranos de glóbulos rojos (BFU-E). Este regulador reduce la síntesis de ADN en BFU-E, lo que afecta el desarrollo de glóbulos rojos.
Área de la Ciencia:
- Hematología Hematología.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- El locus Fv2 en ratones influye en la susceptibilidad al virus de la eritroleucemia de Friend.
- La eritropoiesis involucra células progenitoras como la BFU-E (unidad eritroide formadora de explosiones).
- La regulación de la síntesis de ADN en los primeros progenitores eritroides no se entiende completamente.
Objetivo del estudio:
- Para investigar el control genético de la síntesis de ADN en BFU-E.
- Identificar los mecanismos que regulan la proliferación temprana de las células progenitoras eritropoyéticas.
- Para caracterizar la naturaleza de la influencia del locus Fv2 en el BFU-E.
Principales métodos:
- Experimentos de suicidio celular in vivo e in vitro utilizando 3H-timidina y hidroxiurea.
- Lavar las células de la médula ósea para evaluar los cambios en la síntesis del ADN.
- Análisis de supernatantes libres de células para la actividad inhibidora.
- Caracterización bioquímica de la actividad inhibidora (estabilidad térmica, filtración, filtración en gel).
Principales resultados:
- BFU-E en ratones Fv2rr resistentes muestra baja síntesis de ADN en comparación con los ratones Fv2ss sensibles.
- El lavado de células de médula ósea Fv2rr aumentó la síntesis de ADN BFU-E a niveles Fv2ss.
- Se identificó un regulador negativo macromolecular no tóxico en los supernatantes de médula Fv2rr, reduciendo la síntesis de ADN BFU-E.
Conclusiones:
- El locus Fv2 regula la eritropoyesis indirectamente mediante el control de un regulador negativo macromolecular.
- Este regulador actúa sobre BFU-E para reducir la síntesis de ADN, lo que indica un mecanismo fisiológico de control de crecimiento negativo.
- Este mecanismo para la proliferación temprana de células progenitoras eritropoyéticas está bajo un estricto control genético.
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