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La vía de señalización de la quinasa 1 activada por el factor de crecimiento transformador β regula críticamente la
Lei Li1, Yi Chen1, Jessica Doan1
1From the Department of Physiology and Biophysics, University of Washington, Seattle, WA (L.L., Y.C., J.D., J.M., Q.L.); and Howard Hughes Medical Institute, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH (J.D.M.).
Circulation
|October 4, 2014
Resumen
La transformadora del factor de crecimiento β-activada quinasa 1 (TAK1) es esencial para la salud del corazón. Su ausencia desencadena la necrosis programada (necroptosis), lo que lleva a insuficiencia cardíaca y remodelación adversa en ratones.
Área de la Ciencia:
- Biología Cardiovascular Biología Cardiovascular
- Mecanismos de muerte celular Mecanismos de muerte celular
- La señalización molecular.
Sus antecedentes:
- La necrosis programada (necroptosis) es crucial en el desarrollo y la enfermedad, pero su regulación cardíaca no está clara.
- El papel de la necroptosis en la remodelación del miocardio y la insuficiencia cardíaca requiere más investigación.
Objetivo del estudio:
- Investigar el papel de la transformadora del factor de crecimiento β-activada quinasa 1 (TAK1) en la regulación de la necroptosis cardíaca.
- Para dilucidar los mecanismos moleculares por los cuales TAK1 influye en la remodelación del miocardio y la insuficiencia cardíaca.
Principales métodos:
- La ablación del gen cardíaco específico de Map3k7 (que codifica TAK1) en ratones.
- Análisis de la apoptosis y necroptosis de los miocitos.
- Evaluación de la remodelación del miocardio y los marcadores de insuficiencia cardíaca.
- Investigación de las vías de señalización del receptor del factor de necrosis tumoral-1 (TNFR1).
Principales resultados:
- La ablación cardíaca específica de Map3k7 indujo apoptosis y necroptosis espontáneas, causando remodelación adversa y insuficiencia cardíaca.
- Estos efectos dependían de la señalización TNFR1.
- TAK1 actúa como un interruptor molecular en la señalización de TNFR1, regulando la formación de complejos de muerte celular que involucran a RIP1, FADD y caspasa 8.
- La inhibición de RIP1 o RIP3 mejoró la muerte celular necroptótica y la insuficiencia cardíaca en ratones con deficiencia de TAK1.
Conclusiones:
- TAK1 es un factor crítico de supervivencia en el corazón, inhibiendo directamente la necroptosis.
- TAK1 es esencial para mantener la homeostasis miocárdica y prevenir la remodelación adversa.
- Dirigirse a las vías de necroptosis mediadas por TAK1 puede ofrecer estrategias terapéuticas para la insuficiencia cardíaca.
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