title: Design of an anti-adhesive surface by a pilicide strategy.
abstract: Biofilm formation on surfaces is one of major problems in medical, cosmetic and food industries. Nowadays any efficient treatment is known, as consequence, research of new strategies to inhibit biofilm formation is urgent. Recently, virstatin, which interferes with bacterial type IV pili formation, has demonstrated a capacity to inhibit biofilm formation developed by Acinetobacter baumannii after 24h. In this study, we aim to elaborate anti-adhesive surfaces preventing biofilm development by the covalent immobilization of virstatin on silicon surface. Surfaces were functionalized by self-assembled monolayers of two aminosilanes (11-aminoundecyltrimethoxysilane (AUTMS) and 3-aminopropyltrimethoxysilane (APTMS)). Then, virstatin (2mM) was immobilized on those modified surfaces. We observed an increase in surface hydrophobicity of AUTMS modified substratum leading to an increase of A. baumannii ATCC 17978 adhesion (after 4h). Immobilization of virstatin molecule on APTMS modified surface was efficient to decrease cell attachment by 32.1±5.7% compared to unmodified surface. As virstatin is known to inhibit type IV pili formation in solution, the observed decrease of bacterial adhesion might be due to this pilicide action. We also demonstrated that hydrophobicity of strains plays a role in adhesion according to surface properties. In conclusion, immobilized virstatin succeeded to inhibit bacterial attachment of various Acinetobacter baumannii strains comparing to APTMS modified support.
authors.affiliation: Normandie Univ, UNIROUEN, INSA Rouen, CNRS, PBS, 76000 Rouen, France.
authors.forename: Fany
authors.initials: F
authors.lastname: Reffuveille
authors.affiliation: Normandie Univ, UNIROUEN, INSA Rouen, CNRS, PBS, 76000 Rouen, France.
authors.forename: Marion
authors.initials: M
authors.lastname: Nicol
authors.affiliation: Normandie Univ, UNIROUEN, INSA Rouen, CNRS, PBS, 76000 Rouen, France.
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Dé
authors.affiliation: Normandie Univ, UNIROUEN, INSA Rouen, CNRS, PBS, 76000 Rouen, France. Electronic address: pascal.thebault@univ-rouen.fr.
authors.forename: Pascal
authors.initials: P
authors.lastname: Thébault
mesh_terms: D040981:Acinetobacter baumannii / Q000187:drug effects*; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology*; D001422:Bacterial Adhesion / Q000187:drug effects*; D018441:Biofilms / Q000187:drug effects / Q000254:growth & development*; D002087:Butyrates / Q000494:pharmacology; D015195:Drug Design; D010861:Fimbriae, Bacterial / Q000187:drug effects*; D057927:Hydrophobic and Hydrophilic Interactions; D008124:Locomotion / Q000187:drug effects; D053644:Naphthalimides / Q000494:pharmacology; D011437:Propylamines / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D013499:Surface Properties; D014774:Virulence / Q000187:drug effects
chemical_list: C000597752:11-aminoundecyltrimethoxysilane; D000900:Anti-Bacterial Agents; D002087:Butyrates; D053644:Naphthalimides; D011437:Propylamines; D012821:Silanes; C505381:virstatin; C088294:3-aminopropyltrimethoxysilane
keywords: Anti-adhesive surface; Bacterial adhesion; Surface modification; Virstatin