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Determining Membrane Protein Topology Using Fluorescence Protease Protection FPP
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Desintegración límbico-visual y especialización de la red de saliencia caracterizan la topología de la red del
Himanshu R Pandey1,2, Amit Keshri3, Neeraj Sinha1,2
1Centre of Bio-Medical Research, Sanjay Gandhi Postgraduate Institute of Medical Sciences Campus, Lucknow, India.
The European journal of neuroscience
|February 3, 2026
Resumen
El tinnitus subjetivo (TS) implica cambios específicos en la red cerebral, no globales. Estos incluyen conectividad alterada en las redes visual, límbica y de saliencia, vinculada a la gravedad de los síntomas y la ansiedad.
Área de la Ciencia:
- Neurociencia
- Imagen Médica
- Psiquiatría
Sus antecedentes:
- Se cree que el tinnitus subjetivo (TS) se origina en la reorganización de redes cerebrales a gran escala.
- Los circuitos cerebrales específicos involucrados y cómo se relacionan con la gravedad de los síntomas aún no están claros.
Objetivo del estudio:
- Investigar las alteraciones precisas de la red cerebral asociadas con el tinnitus subjetivo.
- Explorar la relación entre la gravedad del tinnitus, la ansiedad y los patrones específicos de conectividad de la red.
- Identificar posibles marcadores de neuroimagen para la estratificación de pacientes y la orientación del tratamiento en TS.
Principales métodos:
- Se combinó la resonancia magnética funcional en estado de reposo (teoría de grafos, conectividad de ROI a ROI) y la VBM en 114 participantes (57 TS, 57 controles).
- Se utilizó una parcellación armonizada de 50 ROI del atlas CONN en 15 redes funcionales.
- Se emplearon análisis multivariados y análisis nodo por nodo, controlando covariables y comparaciones múltiples.
Principales resultados:
- Se identificó una reorganización selectiva, no global, de la red en pacientes con TS.
- Se observó una reducción de la integración en el giro parahipocampal posterior izquierdo y un aumento de la segregación en los centros frontales/insulares.
- Se encontraron hiperconectividad en circuitos fronto-salience-lenguaje-cerebelosos e hipoconectividad en las vías del modo por defecto/atención dorsal.
- Se relacionó una mayor gravedad del tinnitus con una menor integración visual medial/límbica y una mayor conectividad del opérculo frontotemporal.
- Se asoció una mayor ansiedad con una mayor integración en áreas subcallosas/cerebelosas/occipito-límbicas y una menor conectividad del putamen.
- La VBM reveló amplias reducciones de la sustancia blanca en regiones cerebrales específicas.
Conclusiones:
- El tinnitus subjetivo se caracteriza por una reorganización selectiva de la red, específicamente una menor integración temporomedial/visual-límbica y una mayor especialización local.
- Estos hallazgos proporcionan una fuerte evidencia de que el TS refleja alteraciones de circuitos específicos en lugar de cambios cerebrales globales.
- Las firmas multimodales identificadas, vinculadas a los síntomas, ofrecen marcadores de circuito accionables para aplicaciones clínicas en TS.
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