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• W2039888568 abstract "Collagen is the major structural protein of human dentin. Degradation of collagen by bacterial enzymes can facilitate microbial penetration, compromise structural/interfacial integrity, and lower resistance to fracture of dentin. We evaluated the ability of photodynamic therapy (PDT), bioactive chitosan nanoparticles (CSnp), or PDT in combination with CSnp to inhibit bacterial collagenase-mediated degradation of collagen.Rat type 1 fibrillar collagen matrices were untreated or treated with 2.5% glutaraldehyde (GD), 2.5% GD followed by 1% CSnp, 1% CSnp, PDT (rose bengal activated with 540 nm light at 40 J/cm(2)), or 1% CSnp followed by PDT. Samples, except those used as untreated controls, were exposed to Clostridium histolyticum collagenase (125 CDU/mL) for 24 hours. The soluble digestion products were assessed by hydroxyproline assay, and the remaining adherent collagen was quantified by picrosirius red staining. Fourier transform infrared spectroscopy, immunoblotting, and scanning electron microscopy were used to study the interaction between CSnp/PDT with type 1 collagen. The data were analyzed by 1-way analysis of variance and post hoc Tukey test.As assessed by hydroxyproline release into the medium, collagen treated with CSnp, PDT, or a combination of CSnp and PDT exhibited less degradation than untreated controls (3.6-fold, 1.7-fold, and 7.9-fold reduction, respectively; P < .05). Compared with all other treatments, GD-treated collagen was the most resistant to collagenolytic degradation (239.6-fold reduction, P < .05). The abundance of post-treatment residual collagen, as measured by picrosirius red staining, was inversely related to the extent of collagen degradation. Analysis of collagen cross-links with Fourier transform infrared spectroscopy showed that PDT or GD treatments enhanced collagen cross-linking. Immunoblotting of sedimented CSnp indicated that CSnp and collagenase bound with low affinity. However, CSnp-bound collagenase showed a significant reduction in collagenolytic activity compared with controls (P < .05).Combined photochemical cross-linking of rat tail collagen by PDT and binding to CSnp inhibit collagenolytic activity." @default.
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• W2039888568 date "2014-05-01" @default.
• W2039888568 modified "2023-09-27" @default.
• W2039888568 title "Bioactive Chitosan Nanoparticles and Photodynamic Therapy Inhibit Collagen Degradation In Vitro" @default.
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• W2039888568 doi "https://doi.org/10.1016/j.joen.2013.11.004" @default.
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