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In Vivo Biosensor Tracks Non-apoptotic Caspase Activity in Drosophila
Published on: November 27, 2016
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El producto del gen DCC induce la apoptosis por un mecanismo que requiere proteólisis del receptor
P Mehlen1, S Rabizadeh, S J Snipas
1Program on Aging, The Burnham Institute, La Jolla, California 92037, USA.
Nature
|October 31, 1998
Resumen
El gen eliminado en el cáncer colorrectal (DCC) suprime los tumores al inducir la apoptosis cuando su ligando, la netrina-1, está ausente. La escisión de DCC por caspase-3 es esencial para esta función supresora del tumor.
Área de la Ciencia:
- Biología molecular La biología molecular.
- Investigación de la investigación del cáncer.
- La señalización celular de las células.
Sus antecedentes:
- El desarrollo del cáncer colorrectal implica mutaciones genéticas, incluido el supresor tumoral candidato DCC.
- El DCC codifica el receptor de netrina-1, crucial para la orientación de los axones.
- La pérdida de la expresión de DCC se correlaciona con la tumorigenicidad, pero su mecanismo sigue sin estar claro.
Objetivo del estudio:
- Para dilucidar el mecanismo por el cual el DCC suprime la formación de tumores.
- Para investigar el papel de la unión a la netrina-1 y la escisión de la caspasa en la función del DCC.
Principales métodos:
- Se investigó el efecto del DCC en la apoptosis con y sin netrina-1.
- DCC identificado como un sustrato de caspase.
- Mutó el sitio de escisión de la caspasa-3 en DCC para evaluar su impacto en la apoptosis.
Principales resultados:
- El DCC induce la apoptosis independientemente de la unión a la netrina-1.
- La unión de la netrina-1 al DCC inhibe la apoptosis.
- La escisión de DCC por caspase-3 es necesaria para su actividad pro-apoptótica, específicamente en Asp 1,290.
Conclusiones:
- El DCC funciona como un supresor tumoral promoviendo la apoptosis cuando la netrina-1 no está disponible.
- Esta función pro-apoptótica está mediada por cascadas de caspasas y requiere la escisión de DCC en Asp 1,290.
- El mecanismo de la DCC implica la inducción de la apoptosis independiente de los ligandos a través de la escisión mediada por caspasa, crucial para la supresión tumoral.
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