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Instituto Nacional de Neurología y Neurocirugía

2015, Número 1

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Arch Neurocien 2015; 20 (1)


Avances moleculares en el síndrome de Down y su posible aplicación en neurología

Ramos-Kuri M, Salgado-Sánchez E

Idioma: Español
Referencias bibliográficas: 66
Paginas: 65-78
Archivo PDF: 369.76 Kb.


RESUMEN

Se revisan los avances recientes en el síndrome de Down (SD), haciendo énfasis en su terapia molecular y potencial terapéutico en enfermedades como Alzheimer (EA) y otros trastornos de déficit cognoscitivo. El SD es la principal causa de retraso mental a nivel mundial, causado por la trisomía completa o parcial del cromosoma 21, y es bien conocida su estrecha relación con la EA, de inicio muy temprano. La sobre-expresión de genes del cromosoma 21 es la principal causa del SD, pero se han identificado algunos genes especialmente importantes. Por ejemplo, el gen DYRK1A (dual specificity tyrosine phosphorylation-regulated kinase) participa en el déficit cognitivo tanto en SD como en la EA. Su fisiopatología es porque el exceso de DYRK1A hiper fosforila a la proteína precursora de amiliode (APP) y a la unidad asociada a tubulina (TAU) proteínas bien conocidas en la génesis de la EA. Otra aplicación potencial es que los pacientes con SD presentan menor incidencia de tumores sólidos; su mecanismo es inhibiendo angiogénesis, por inhibición del factor de crecimiento vascular endotelial (VEGF) a través de la inhibición de calcineurina, gracias a la sobre-expresión del gen DSCR-1 presente en el cromosoma 21. Aunque el SD aún no cuenta con terapia específica, se realiza terapia molecular en modelos murinos con SD, con dos péptidos intestinales vasoactivos NAP y SAL. Los ratones así tratados mostraron una clara disminución en el déficit cognoscitivo, sugiriendo un alto potencial terapéutico para el SD; así como, otros tipos de retardo mental y déficit de aprendizaje.


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