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| Pàgina inicial > Articles > Articles publicats > Exogenous prion-like proteins and their potential to trigger cognitive dysfunction |
| Data: | 2025 |
| Resum: | The gut is exposed to a wide range of proteins, including ingested proteins and those produced by the resident microbiota. While ingested prion-like proteins can propagate across species, their implications for disease development remain largely unknown. Here, we apply a multidisciplinary approach to examine the relationship between the biophysical properties of exogenous prion-like proteins and the phenotypic consequences of ingesting them. Through computational analysis of gut bacterial proteins, we identified an enrichment of prion-like sequences in Helicobacter pylori. Based on these findings, we rationally designed a set of synthetic prion-like sequences that form amyloid fibrils, interfere with amyloid-beta-peptide aggregation, and trigger prion propagation when introduced in the yeast Sup35 model. When C. elegans were fed bacteria expressing these prion-like proteins, they lost associative memory and exhibited increased lipid oxidation. These data suggest a link between memory impairment, the conformational state of aggregates, and oxidative stress. Overall, this work supports gut microbiota as a reservoir of exogenous prion-like sequences, especially H. pylori, and the gut as an entry point for molecules capable of triggering cognitive dysfunction. |
| Ajuts: | Ministerio de Ciencia, Innovación y Universidades FPU21/03897 Agencia Estatal de Investigación CNS2023-14443 Agencia Estatal de Investigación PID2020-117454RA-I0 Agencia Estatal de Investigación RYC2019-026752-I |
| Nota: | Altres ajuts: μFTIR experiments were performed at MIRAS beamline at ALBA Synchrotron with the collaboration of ALBA staff. Transmission electron microscopy (TEM) images were acquiredat the Servei de Microscòpia i Difracció de Raigs X (SMiDRX) of the Universitat Autònoma de Barcelona (UAB). |
| Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
| Llengua: | Anglès |
| Document: | Article ; recerca ; Versió publicada |
| Matèria: | Aggregation ; Amyloid ; Microbiome ; Neurodegeneration ; Prion Protein |
| Publicat a: | Molecular systems biology, (2025) , ISSN 1744-4292 |
26 p, 3.8 MB |