{"ok":true,"nota":{"id":"7b2f301d9df22b8c","slug":"descubren-una-especie-de-andamio-externo-que-ayuda-al-cerebro-a-guarda-7b2f30","titulo":"Descubren una especie de 'andamio' externo que ayuda al cerebro a guardar recuerdos temporales","resumen":"Investigadores hallaron en ratones una red de una proteína de la matriz extracelular que se forma alrededor de neuronas activadas durante un aprendizaje y que es necesaria para recordar un miedo aprendido.","fuente":"biorxiv","fuenteNombre":"bioRxiv · preprints","color":"#be2628","autor":"Guajardo, R., Starnes, A. N., Mula, S. M., Kim, D. K., Bennett, M., Cao, R., Yuan, D., Girguis, M., Wu, L., Xu, H., Ferr","url":"https://www.biorxiv.org/content/10.64898/2026.10.23.760812v1?rss=1","imagen":"/hoy/portada/7b2f301d9df22b8c","tema":"ciencia","subtemas":["memoria","neurociencia","hipocampo","matriz extracelular"],"entidades":["hipocampo","ratones"],"formato":"dato","entretenimiento":false,"pubTs":"2026-10-24T00:00:00.000Z","indexTs":"2026-10-24T13:11:28.041Z","hash":"6b27abc64090385728085bcefadbbff1a790b8e1529b37f12dbf21a9b0e0084b","tsa":{"time":"Oct 24 13:11:52 2026 GMT","provider":"freetsa.org","sobre":"sello"},"stats":{"views":0,"likes":0,"clicks":0,"dwell":0},"tipo":"normal","registro":"hallazgo","porQueImporta":"El hallazgo muestra que la memoria no depende solo de las neuronas, sino también de una estructura que las rodea y que puede durar un tiempo limitado. Cuando se borra esa red, los ratones dejan de expresar el recuerdo de miedo. Para la gente de acá, esto abre una pregunta concreta: si estos mecanismos se pueden manipular algún día, también se podrían tratar memorias traumáticas. Por ahora es un estudio en ratones y en etapa preliminar, sin aplicaciones clínicas.","quienFirma":"bioRxiv · preprints","confianza":"preprint","consulta":null},"sello":{"hash":"6b27abc64090385728085bcefadbbff1a790b8e1529b37f12dbf21a9b0e0084b","sello":"de477a230871908deaf43eb31a72b4a37bdad84be4795a300bfdff053fba500a","beacon":{"drand":{"cadena":"8990e7a9aaed2ffed73dbd7092123d6f289930540d7651336225dc172e51b2ce","ronda":6580549,"aleatorio":"7911ede6e40eb43c8d52a5aa70989c9e983bf6b4e3e546038bdf2fb3f7963d94","tiempo":"2026-10-24T13:11:30.000Z"},"nist":{"cadena":2,"pulso":1997468,"salida":"17E8B17C027FF6563CB9C523DB47FDE314546641306A50EB72EBE3F0C682F5AD47E98E06F21F7AF2C586B0ABC09F74B248595311CFF4E4AD942361BBAD0151C4","tiempo":"2026-10-24T13:11:00.000Z"},"noAntes":"2026-10-24T13:11:30.000Z"},"verificacion":{"drand":true,"nist":true},"tsa":{"time":"Oct 24 13:11:52 2026 GMT","provider":"freetsa.org","sobre":"sello"},"original":{"titulo":"An extracellular substrate for the temporary storage of memories","descripcion":"Activation of a sparse population of neurons during learning is thought to lead to functional changes that stabilize newly formed memories. Here, we identify a molecular scaffolding in the hippocampal dentate gyrus (DG) that assembles around learning-activated neurons, alters neuronal excitability, and is required for fear memory expression. We found that the structural extracellular matrix (ECM) protein aggrecan is highly expressed in DG excitatory neurons. Dense aggrecan nets were deposited around learning-activated neurons after contextual fear conditioning, and these aggrecan-rich neurons were five-fold more likely to reactivate upon memory recall. Conversely, loss of DG aggrecan led to ","pubDate":"2026-10-24","url":"https://www.biorxiv.org/content/10.64898/2026.10.23.760812v1?rss=1"},"indexado":"2026-10-24T13:11:28.041Z"}}