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La senescencia celular en primates envejecidos.
Utz Herbig1, Mark Ferreira, Laura Condel
1Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI 02903, USA.
Science (New York, N.Y.)
|February 4, 2006
Resumen
La senescencia celular, una detención irreversible del ciclo celular, aumenta en el envejecimiento de la piel del babuino. Este estudio confirma que los fibroblastos senescentes se acumulan con la edad, contribuyendo al envejecimiento del organismo.
Área de la Ciencia:
- Gerontología Gerontología.
- Biología celular Biología celular.
- Dermatología Dermatología dermatología.
Sus antecedentes:
- El envejecimiento del organismo implica el deterioro funcional.
- La senescencia replicativa es una capacidad limitada de división celular en las células somáticas de mamíferos.
- El papel de la senescencia celular en el envejecimiento del organismo sigue siendo objeto de debate.
Objetivo del estudio:
- Investigar la contribución de la senescencia celular al envejecimiento del organismo.
- Para examinar la disfunción de los telómeros como un biomarcador para la senescencia celular in vivo.
- Para cuantificar la acumulación de células senescentes en el envejecimiento de la piel de primates.
Principales métodos:
- Estudió a los babuinos envejecidos para evaluar las poblaciones de fibroblastos de la piel.
- Cuantificó el porcentaje de fibroblastos senescentes en el tejido de la piel.
- Se confirmó la senescencia utilizando biomarcadores como la ataxia-telangiectasia activada, la cinasa mutada y los núcleos heterocromatinizados.
Principales resultados:
- Los fibroblastos senescentes aumentaron exponencialmente con la edad en la piel del babuino.
- En babuinos muy viejos, las células senescentes constituían más del 15% de todas las células de la piel.
- Las células senescentes confirmadas exhibieron ATM quinasa activada y núcleos heterocromatinizados.
Conclusiones:
- La senescencia celular, marcada por la disfunción de los telómeros, aumenta de manera demostrable en el envejecimiento de la piel de los primates.
- La acumulación de fibroblastos senescentes es una característica del envejecimiento del organismo.
- Los resultados apoyan la hipótesis de que la senescencia celular contribuye al proceso de envejecimiento.
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