The interaction of sodium trimetaphosphate with collagen I induces conformational change and mineralization that prevents collagenase proteolytic attack.

Autor: Carvalho RG; Department of Biochemistry, Federal University of São Paulo, São Paulo, Brazil. Electronic address: rafaelguc@hotmail.com., Alvarez MMP; Department of Biochemistry, Federal University of São Paulo, São Paulo, Brazil. Electronic address: mpalvarez.marcela@gmail.com., de Sá Oliveira T; Biotechnology and Innovation in Health Program, Universidade Anhanguera de São Paulo (UNIAN-SP), São Paulo, SP, Brazil. Electronic address: thales.sa@hotmail.com., Polassi MR; Biotechnology and Innovation in Health Program, Universidade Anhanguera de São Paulo (UNIAN-SP), São Paulo, SP, Brazil. Electronic address: mackeler@gmail.com., Vilhena FV; Trials Oral Health & Technology, SP, Brazil. Electronic address: fabiano@yahoo.com.br., Alves FL; Department of Biophysics, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, SP, Brazil. Electronic address: pelopes2@yahoo.com.br., Nakaie CR; Department of Biophysics, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, SP, Brazil. Electronic address: cnakaie@unifesp.br., Nascimento FD; Interdisciplinary Center of Biochemistry Investigation, University of Mogi das Cruzes, Mogi das Cruzes, SP, Brazil. Electronic address: fdnascimento@gmail.com., D'Alpino PHP; Biotechnology and Innovation in Health Program, Universidade Anhanguera de São Paulo (UNIAN-SP), São Paulo, SP, Brazil. Electronic address: paulodalpino@gmail.com., Tersariol ILDS; Department of Biochemistry, Federal University of São Paulo, São Paulo, Brazil; Interdisciplinary Center of Biochemistry Investigation, University of Mogi das Cruzes, Mogi das Cruzes, SP, Brazil. Electronic address: ivarne.tersariol@gmail.com.
Jazyk: angličtina
Zdroj: Dental materials : official publication of the Academy of Dental Materials [Dent Mater] 2020 Jun; Vol. 36 (6), pp. e184-e193. Date of Electronic Publication: 2020 Apr 15.
DOI: 10.1016/j.dental.2020.03.023
Abstrakt: Objectives: This study evaluated the cell viability and expression of different major genes involved in mineralization in odontoblast-like cells exposed to sodium trimetaphosphate (STMP). It was also investigated the influence of STMP on the rate of calcium phosphate crystal growth, its anti-proteolytic action against the enzymatic degradation of type I collagen, the binding mechanism of STMP to collagen fibrils, and the potential mechanism to induce collagen stabilization.
Methods: Immortalized rat odontoblast MDPC-23 cells were cultured. Cell viability was assessed by trypan blue staining, and the changes in gene expression balance induced by STMP were assessed by quantitative reverse transcription (qRT) PCR assays. Crystalline particle formation was monitored by light-scattering detectors to estimate pH variation and the radial size of the crystalline particles as a function of reaction time (pH 7.4, 25°C) in the presence of STMP in supersaturated calcium phosphate solution (Ca/P=1.67). Images were obtained under atomic force microscopy (AFM) to measure the particle size in the presence of STMP. A three-point bending test was used to obtain the elastic modulus of fully demineralized dentin beams after immersion in STMP solution. The binding mechanism of STMP to collagen fibrils and potential stabilization mechanism was assessed with circular dichroism spectrometry (CD). The data were analyzed statistically (α=0.05).
Results: STMP had no significant influence on the cell viability and gene expression of the MDPC-23 cells. STMP greatly increased the rate of crystal growth, significantly increasing the average radial crystal size. AFM corroborated the significant increase of STPM-treated crystal size. Mineralized collagen I fibrils exhibited less collagenase degradation with lower STMP concentration. CD analysis demonstrated changes in the conformational stability after STMP binding to type I collagen.
Significance: The increased resistance of collagen against the proteolytic activity of collagenases appears to be related to the conformational change induced by STMP binding in collagen I and the STMP capacity for promoting biomimetic mineralization in type I collagen fibrils.
(Copyright © 2020 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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