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Los anticuerpos sensibles a la conformación estabilizan la forma oxidada de PTP1B e inhiben su actividad fosfatasa
Aftabul Haque1, Jannik N Andersen, Annette Salmeen
1Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.
Cell
|October 4, 2011
Resumen
Los investigadores desarrollaron nuevos anticuerpos para estabilizar la forma inactiva de la proteína tirosina fosfatasa 1B (PTP1B), ofreciendo una nueva estrategia terapéutica para la diabetes y la obesidad mediante la mejora de la señalización de la insulina.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Farmacología Farmacología.
Sus antecedentes:
- La proteína tirosina fosfatasa 1B (PTP1B) es un regulador clave de las vías de señalización de la insulina y la leptina.
- La actividad de PTP1B está modulada por especies reactivas de oxígeno (ROS), con su forma oxidada (PTP1B-OX) siendo inactiva.
- PTP1B es un objetivo terapéutico significativo para trastornos metabólicos como la diabetes y la obesidad.
Objetivo del estudio:
- Desarrollar nuevos agentes terapéuticos dirigidos a la PTP1B.
- Investigar el potencial de estabilizar la forma inactiva y oxidada de PTP1B (PTP1B-OX) para obtener beneficios terapéuticos.
Principales métodos:
- Generación de fragmentos variables de cadena única para sensores de conformación (scFvs) diseñados específicamente para unir y estabilizar PTP1B-OX.
- Expresión de estos scFvs como anticuerpos intracelulares (intrabodies) dentro de las células.
- Evaluación del impacto en las vías de señalización de la insulina, incluidos el receptor de insulina y la fosforilación de IRS-1, y la activación de PKB / AKT.
Principales resultados:
- El sensor de conformación scFvs estabilizó con éxito la forma inactiva PTP1B-OX.
- La expresión intracelular de scFvs aumentó la fosforilación tirosil inducida por insulina de la subunidad β del receptor de insulina e IRS-1.
- Se observó un aumento de la fosforilación inducida por insulina de PKB / AKT, lo que indica una mayor señalización de la insulina.
Conclusiones:
- Estabilizar la forma oxidada e inactiva de PTP1B utilizando moléculas específicas como el scFvs es una estrategia viable.
- Este enfoque ofrece un nuevo paradigma para el desarrollo de fármacos dirigidos a la fosfatasa para enfermedades metabólicas.
- La tecnología intracorporal presenta un método prometedor para modular la actividad enzimática de forma intracelular.
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