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Los gangliósidos GM3 y GD3 modulan las vías de agregación de la insulina y reducen la citotoxicidad mediante
bioRxiv : the preprint server for biology
|February 12, 2026
Resumen
Los gangliósidos GM3 y GD3 aceleran la agregación de la insulina, formando estructuras menos tóxicas y no fibrilares. Estos agregados de insulina alterados conservan la capacidad de siembra, lo que afecta la patología y el tratamiento de la diabetes tipo 2 (T2D).
Área de la Ciencia:
- Bioquímica
- Biología Molecular
- Biofísica
Sus antecedentes:
- La agregación amiloide de la insulina es una preocupación crítica en la diabetes tipo 2 (T2D), que afecta la eficacia terapéutica y causa daño celular.
- Se sabe que los gangliósidos influyen en la formación de amiloides en enfermedades neurodegenerativas, pero su papel en la agregación de la insulina está poco estudiado.
Objetivo del estudio:
- Investigar el impacto de los gangliósidos GM3 y GD3 en las vías de agregación de la insulina y las características de los agregados.
- Determinar los cambios estructurales, la citotoxicidad y el potencial de siembra de los agregados de insulina modificados por gangliósidos.
Principales métodos:
- Se utilizaron la cinética de Tioflavina-T, FTIR, espectroscopía de dicroísmo circular, SAXS, RMN y MET para caracterizar la agregación de la insulina.
- Se realizaron ensayos de citotoxicidad para evaluar la toxicidad de los agregados de insulina en presencia y ausencia de gangliósidos.
Principales resultados:
- GM3 y GD3 aceleraron la agregación de la insulina de manera dependiente de la concentración, formando estructuras beading no fibrilares.
- Los agregados unidos a gangliósidos exhibieron estructuras secundarias distintas (racimos globulares ricos en láminas beta con GD3, helicoidales alfa con GM3) y una citotoxicidad significativamente reducida en comparación con los agregados de solo insulina.
- A pesar de la morfología alterada, los oligómeros de insulina unidos a gangliósidos conservaron su capacidad de siembra.
Conclusiones:
- Los gangliósidos GM3 y GD3 modulan el polimorfismo amiloide de la insulina, reduciendo la toxicidad de los agregados.
- Estos hallazgos ofrecen nuevas perspectivas sobre el papel de los gangliósidos en la patogénesis de la T2D y las posibles estrategias terapéuticas.
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