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El factor 1 estimulante de colonias regula las nuevas ciclinas durante la fase G1 del ciclo celular
H Matsushime1, M F Roussel, R A Ashmun
1Department of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105.
Cell
|May 17, 1991
Resumen
El factor de estimulación de colonias 1 (CSF-1) regula la expresión génica ciclinal (CYL) del ratón durante la fase G1 de los macrófagos. Las proteínas CYL son cruciales para iniciar la síntesis de ADN, siendo el CSF-1 esencial para su estabilidad y función.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- Inmunología Inmunología.
Sus antecedentes:
- La proliferación de los macrófagos está regulada por el factor estimulante de colonias 1 (CSF-1).
- La progresión del ciclo celular implica la expresión génica específica y la regulación de las proteínas.
- Las proteínas de tipo ciclina (CYL) están implicadas en el control del ciclo celular.
Objetivo del estudio:
- Para investigar el papel de los genes de ciclina de ratón (CYL) en la regulación del ciclo celular de los macrófagos.
- Para determinar la influencia de CSF-1 en la expresión génica de CYL y la estabilidad de la proteína.
- Para aclarar la función de las proteínas CYL durante fases específicas del ciclo celular.
Principales métodos:
- Aislamiento de tres genes CYL de ratón.
- Análisis de la regulación del gen CYL por CSF-1 durante la fase G1.
- Evaluación de la degradación y fosforilación de las proteínas CYL.
- Investigación de la asociación de la proteína CYL con los polipéptidos relacionados con cdc2.
Principales resultados:
- Dos de los tres genes CYL aislados son regulados por CSF-1 durante G1.
- La privación de CSF-1 en G1 causa una rápida degradación de las proteínas p36CYL.
- La degradación de p36CYL se correlaciona con la incapacidad de iniciar la síntesis de ADN.
- Los macrófagos que entran en la fase S no requieren la expresión del gen CSF-1 o CYL para la división.
- p36CYL se fosforila y se une a un polipéptido relacionado con cdc2 durante G1.
Conclusiones:
- CSF-1 es esencial para mantener la estabilidad y la función de la proteína CYL durante la fase G1.
- Los genes CYL juegan un papel crítico en el compromiso de transición de fase G1 a S.
- La fosforilación y la asociación de p36CYL con proteínas relacionadas con cdc2 sugieren un papel en la regulación del ciclo celular.
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