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<dc:title xml:lang="en">Towards anti-biofilm hydrogels targeting bacterial functional amyloid fibrils</dc:title>
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<dc:subject xml:lang="fr">Anti-amyloïde</dc:subject>
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<dc:subject xml:lang="fr">Sans antibiotique</dc:subject>
<dc:subject xml:lang="fr">Agarose</dc:subject>
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<dc:subject xml:lang="en">Anti-amyloid</dc:subject>
<dc:subject xml:lang="en">Antibiofilm</dc:subject>
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<dcterms:abstract xml:lang="fr">Le ciblage des fibrilles amyloïdes fonctionnelles bactériennes est une stratégie prometteuse pour lutter contre les infections liées au biofilm en perturbant l’adhésion et la formation du biofilm sans effets bactéricides. Cette étude a évalué une panoplie de molécules, pour la plupart biosourcées, pour leur capacité à désassembler les peptides amyloïdes R5T et R13T d’Escherichia coli et de Staphylococcus epidermidis, respectivement. Parmi les molécules testées, la lawsone (LWS), la juglone (JUG), le 1,8-dihydroxynaphtalène (DHN) et le poly(acide acrylique) (PAA) ont fortement désassemblé R5T et R13T à des niveaux sub-bactériostatiques et non cytotoxiques, modulant les structures secondaires riches en feuillets β des deux peptides. De plus, LWS, JUG et DHN ont perturbé sélectivement les amyloïdes fonctionnelles chez E. coli et S. epidermidis et affecté leurs biofilms d’une manière dépendante de la souche, du milieu et du temps. Afin d’explorer leur utilisation dans le développement de biomatériaux anti-biofilm, le LWS et le DHN ont été chargés dans des hydrogels d’agarose. Le LWS a été rapidement libéré de l’hydrogel, tandis que le DHN est resté largement conservé par la matrice de l’hydrogel. Ces résultats démontrent que le ciblage des amyloïdes bactériennes est une stratégie anti-biofilm viable et soutiennent le développement d’hydrogels anti-biofilm sans antibiotiques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Targeting bacterial functional amyloid fibrils is a promising strategy to combat biofilm-related infections by disrupting adhesion and biofilm formation without bactericidal effects. This study evaluated a panel of molecules, mostly bio-sourced, for their ability to disassemble R5T and R13T – amyloid peptides from Escherichia coli and Staphylococcus epidermidis, respectively. Among the molecules tested, lawsone (LWS), juglone (JUG), 1,8-dihydroxynaphthalene (DHN), and poly(acrylic acid) (PAA) strongly disassembled R5T and R13T at sub-bacteriostatic, non-cytotoxic levels, modulating the β-sheet-rich secondary structures of both peptides. Also, LWS, JUG, and DHN selectively affected functional amyloids in E. coli and S. epidermidis and modulated their biofilms in a strain-, medium-, and time-dependent manner. To explore their use in developing anti-biofilm biomaterials, LWS and DHN were loaded into agarose hydrogels. LWS was rapidly released from the hydrogel, whereas DHN remained largely retained by the hydrogel matrix. These findings demonstrate targeting bacterial amyloids as a viable anti-biofilm strategy and support the development of antibiotic-free, anti-biofilm hydrogels.</dcterms:abstract>
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