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Root canal content from primary endodontic infection and upregulation of gelatinases in fibroblast cells
Author(s) -
Herrera D. R.,
Silva E. J. N. L.,
Santos C. C.,
Zaia A. A.,
Ferraz C. C. R.,
Almeida J. F. A.,
Gomes B. P. F. A.
Publication year - 2015
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12421
Subject(s) - root canal , limulus amebocyte lysate , matrix metalloproteinase , antigenicity , periodontitis , dentistry , collagenase , fibroblast , chemistry , microbiology and biotechnology , medicine , biology , lipopolysaccharide , immunology , enzyme , in vitro , biochemistry , antibody
Aim To investigate endotoxin levels from primary endodontic infections before and after chemomechanical preparation ( CMP ) and to determine their antigenicity against 3T3 fibroblasts through gelatinolytic activity of matrix metalloproteinases ( MMP s). Methodology Twenty‐four root canals with primary endodontic infection and apical periodontitis were selected. Samples were collected using paper points before (S1) and after chemomechanical preparation ( CMP ) (S2). The limulus amebocyte lysate assay was used for endotoxin measurement. Fibroblasts were stimulated with root canal contents for 24 h. Supernatants of cell cultures stimulated with root canal contents were collected after 24 h to determine the levels of MMP ‐2 and MMP ‐9 gelatinolytic activity using the zymography technique. Friedman and Wilcoxon tests were used to compare the amount of endotoxin before (S1) and after CMP (S2) ( P < 0.05). Data obtained from gelatinolytic activity were analysed using anova and Tukey's tests ( P < 0.05). Results Endotoxin was recovered in 100% of the samples. There was a significant reduction in endotoxin levels after CMP ( P < 0.05). A correlation was found between the levels of endotoxins and MMP ‐2 expression ( P < 0.05). Root canal contents of initial samples (S1) induced significantly greater MMP ‐2 expression by fibroblasts when compared to S2 and the nonstimulated group ( P < 0.05). No gelatinolytic activity of MMP ‐9 was observed in S1, S2 and control group. Conclusions Root canal contents from primary endodontic infections had gelatinolytic activity for MMP ‐2. Moreover, CMP was effective in reducing endotoxin levels and their antigenicity against fibroblasts on gelatinolytic activity.