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El daño oxidativo relacionado con la neurodegeneración por nitratación selectiva de alfa-sinucleína en lesiones de
B I Giasson1, J E Duda, I V Murray
1Center for Neurodegenerative Disease Research and Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
Science (New York, N.Y.)
|November 4, 2000
Resumen
Las proteínas de alfa-sinucleína nitrada se acumulan en las lesiones cerebrales características de la enfermedad de Parkinson y trastornos relacionados. Este hallazgo vincula directamente el estrés oxidativo con la progresión de estas sinucleinopatías neurodegenerativas.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Patología Patología Patología.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La alfa-sinucleína agregada forma lesiones cerebrales características en las sinucleinopatías neurodegenerativas.
- El estrés oxidativo está implicado en la patogénesis de ciertas sinucleinopatías.
Objetivo del estudio:
- Investigar la presencia y la importancia de la alfa-sinucleína nitrada en las principales sinucleinopatías.
- Establecer un vínculo directo entre el daño oxidativo/nitrativo y la progresión de la enfermedad.
Principales métodos:
- Se utilizaron anticuerpos dirigidos a los residuos de tirosina nitrada en la alfa-sinucleína.
- Se examinaron tejidos cerebrales de pacientes con enfermedad de Parkinson, demencia con cuerpos de Lewy, variante de cuerpo de Lewy, enfermedad de Alzheimer y atrofia de sistemas múltiples.
- Se analizan las fracciones de proteínas insolubles y los cuerpos de inclusión.
Principales resultados:
- Se ha demostrado una acumulación extensa y generalizada de alfa-sinucleína nitrada en inclusiones de firma en todas las sinucleinopatías estudiadas.
- La alfa-sinucleína nitrada confirmada constituye los principales componentes filamentosos de estas inclusiones.
- Se encontró alfa-sinucleína nitrada en fracciones insolubles de regiones cerebrales afectadas.
Conclusiones:
- La nitratación selectiva de la alfa-sinucleína es una característica clave de la enfermedad de Parkinson y trastornos relacionados.
- Proporciona evidencia directa que vincula el daño oxidativo y nitrativo con la aparición y progresión de las sinucleinopatías.
- Destaca la alfa-sinucleína nitrada como un potencial biomarcador y objetivo terapéutico.
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