title: Role of toll-like receptor 4 in the inflammation reaction surrounding silicone prosthesis.
abstract: The inflammation which occurs around the silicone prosthesis is a complex process that can provoke the failure of the device and compromise the health of the implanted patient. Toll-like receptors (TLRs), which are transmembrane proteins, are now known to act in the innate immune response and in endogenous inflammation. The aim of our study was to assess the role of TLR4 in the foreign body reaction to a silicone shell prosthesis. Disks of shell silicone prosthesis were implanted in the subcutaneous tissue of C57BL6-TLR4-/- and C57BL6-WT mice. At day 14, inflammatory cell infiltrate and vessel sections around the prosthesis were less numerous in TLR4-/- than in WT mice. A histomorphometric analysis showed that the capsule around the implant was 1.96-fold less thick in depleted TLR4 than in wild-type mice. In addition, vascular endothelial growth factor and transforming growth factor 1 were underexpressed in the surrounding tissue of the prosthesis in TLR4-/- mice. Our study suggests, from this foreign body response model against silicone in mice, that TLR4 plays a key role in the reaction process around silicone implants.
authors.affiliation: Department of Plastic and Reconstructive Surgery, Rouen University Hospital, Rouen, France. Isabelle.Auquit-Auckbur@chu-rouen.fr
authors.forename: Isabelle
authors.initials: I
authors.lastname: Auquit-Auckbur
authors.forename: Frédérique
authors.initials: F
authors.lastname: Caillot
authors.forename: Christophe
authors.initials: C
authors.lastname: Arnoult
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Menard
authors.forename: Laurent
authors.initials: L
authors.lastname: Drouot
authors.forename: Philippe
authors.initials: P
authors.lastname: Courville
authors.forename: François
authors.initials: F
authors.lastname: Tron
authors.forename: Philippe
authors.initials: P
authors.lastname: Musette
mesh_terms: D000818:Animals; D016207:Cytokines / Q000235:genetics / Q000378:metabolism; D005347:Fibroblasts / Q000378:metabolism / Q000473:pathology; D005786:Gene Expression Regulation; D007249:Inflammation / Q000378:metabolism / Q000473:pathology*; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D019919:Prosthesis Implantation / Q000009:adverse effects*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012828:Silicones / Q000009:adverse effects*; D051197:Toll-Like Receptor 4 / Q000172:deficiency / Q000378:metabolism*
chemical_list: D016207:Cytokines; D036341:Intercellular Signaling Peptides and Proteins; D012333:RNA, Messenger; D012828:Silicones; D051197:Toll-Like Receptor 4