title: Characterization of a conjugate between Rose Bengal and chitosan for targeted antibiofilm and tissue stabilization effects as a potential treatment of infected dentin.
abstract: Bacterial biofilms and dentin structural changes are some of the major challenges in the management of infected dentin tissue. This study characterized a photosensitizer-conjugated chitosan with enhanced photodynamic efficacy against dental biofilms, as well as the ability to reinforce the postinfected dentin matrix in order to improve its mechanical and chemical stability. Rose Bengal-conjugated chitosan (CSRB) was synthesized using a chemical cross-linking method and characterized for photophysical, photobiological, and cytotoxicity properties. Its potential as an antibacterial and matrix-reinforcing agent on dentin collagen was also evaluated. Enterococcus faecalis as planktonic and in vitro biofilms was treated with CSRB and photodynamically activated with 5 to 60 J/cm(2) green light. Dentin collagen was used for the CSRB cross-linking experiments and evaluated for chemical changes, resistance to enzymatic degradation, and mechanical properties. CSRB was a photosensitizer with efficient singlet oxygen yield. In vitro photoactivation gave higher fibroblast cell survival than did RB alone. CSRB showed significant antibiofilm photoinactivation (P < 0.01). The CSRB-cross-linked dentin collagen showed higher resistance to collagenase degradation and superior mechanical properties (P < 0.05). In summary, the photoactivated CSRB particles synthesized in this study may be a synergistic multifunctional treatment approach with lower cytotoxicity and effective antibiofilm activity as well as the ability to reinforce the dentin collagen to enhance resistance to degradation and improve mechanical properties. This may be a targeted treatment strategy to deal with infected dentin hard tissues in a clinical scenario, where both disinfection and structural integrity need to be addressed concomitantly.
authors: Discipline of Endodontics, Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada.
authors: Annie
authors: A
authors: Shrestha
authors: Michael R
authors: MR
authors: Hamblin
authors: Anil
authors: A
authors: Kishen
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D018441:Biofilms / Q000187:drug effects / Q000254:growth & development; D002234:Carbodiimides; D002417:Cattle; D002470:Cell Survival / Q000187:drug effects; D048271:Chitosan / Q000737:chemistry*; D003094:Collagen / Q000737:chemistry*; D017364:Collagenases / Q000378:metabolism; D003432:Cross-Linking Reagents; D003804:Dentin / Q000737:chemistry / Q000382:microbiology; D013293:Enterococcus faecalis / Q000187:drug effects* / Q000254:growth & development; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects; D006801:Humans; D008027:Light; D051379:Mice; D041681:NIH 3T3 Cells; D055668:Photochemical Processes; D017319:Photosensitizing Agents / Q000737:chemistry*; D010933:Plankton / Q000187:drug effects / Q000254:growth & development; D012395:Rose Bengal / Q000737:chemistry*; D013718:Tensile Strength
chemical_list: C518491:1-ethyl-3-(3-(diethylamino)propyl)carbodiimide; D000900:Anti-Bacterial Agents; D002234:Carbodiimides; D003432:Cross-Linking Reagents; D017319:Photosensitizing Agents; D012395:Rose Bengal; D003094:Collagen; D048271:Chitosan; D017364:Collagenases