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La conversión directa de los fibroblastos de ratón en células similares a los hepatocitos por factores definidos
Sayaka Sekiya1, Atsushi Suzuki
1Division of Organogenesis and Regeneration, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
Nature
|July 1, 2011
Resumen
Los investigadores identificaron factores de transcripción clave que reprograman los fibroblastos en células similares a los hepatocitos. Estas células inducidas muestran rasgos específicos del hígado y pueden reparar el tejido hepático dañado, ofreciendo nuevas terapias potenciales para la enfermedad hepática.
Área de la Ciencia:
- Diferenciación celular y organogénesis.
- Biología de los hepatocitos y regeneración hepática.
- Epigenética y reprogramación celular.
Sus antecedentes:
- La formación adecuada de órganos depende de la diferenciación celular controlada, en particular los hepatocitos de las células progenitoras hepáticas.
- Los programas de diferenciación hepática pueden ser inducidos en células no hepáticas, lo que sugiere factores reguladores críticos.
- Comprender estos factores es crucial para avanzar en las terapias de enfermedades hepáticas.
Objetivo del estudio:
- Identificar factores específicos que pueden inducir la diferenciación de los hepatocitos en las células no hepáticas.
- Investigar combinaciones de factores de transcripción para una reprogramación celular eficiente.
- Evaluar el potencial de las células similares a hepatocitos inducidas para aplicaciones terapéuticas.
Principales métodos:
- Cribado de doce factores candidatos para su capacidad de inducir características hepatocíticas.
- Prueba de combinaciones de factores de transcripción, incluyendo Hnf4α con Foxa1, Foxa2 o Foxa3.
- Caracterización in vitro de células inducidas similares a hepatocitos (iHep) y estudios de trasplante in vivo.
Principales resultados:
- Tres combinaciones de factores de transcripción (Hnf4α + Foxa1/Foxa2/Foxa3) convirtieron con éxito los fibroblastos en células iHep.
- Las células iHep exhibieron múltiples características específicas de los hepatocitos.
- El trasplante de células iHep demostró su capacidad para reconstituir los tejidos hepáticos dañados.
Conclusiones:
- Las combinaciones específicas de factores de transcripción pueden inducir eficazmente células similares a los hepatocitos de los fibroblastos.
- Las células inducidas similares a los hepatocitos poseen propiedades funcionales específicas del hígado.
- Este enfoque de reprogramación es prometedor para nuevas estrategias terapéuticas para enfermedades hepáticas.
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