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Gene expression profile altered by orthodontic tooth movement during healing of surgical alveolar defect.
INTRODUCTION: We explored the gene expression profile altered by orthodontic tooth movement (OTM) during the healing of surgical alveolar defects in beagles.
METHODS: An OTM-related healing model was established where a maxillary second premolar was protracted into the critical-sized defect for 6 weeks (group DT6). As controls, natural healing models without OTM were set at 2 weeks (group D2) and at 6 weeks (group D6) after surgery. Total RNAs were extracted from dissected tissue blocks containing the regenerated defects and additionally from sound alveolar bone as a baseline (group C). mRNA profiling was performed using microarray analysis.
RESULTS: Functional annotations of gene clusters based on differentially expressed genes among groups indicated that the gene expression profile of group DT6 had a stronger similarity to that of group D2 than to group D6. The genes participating in high woven-bone fraction in group DT6 could be identified as TNFSF11, MMP13, SPP1, and DMP1, which were verified by quantitative real-time polymerase chain reactions.
CONCLUSIONS: We investigated at the gene level that OTM can affect the healing state of surgical defects serving as favorable matrices for OTM with defect regeneration. It would be a basis on selecting putative genes to be therapeutically applied for tissue-friendly accelerated orthodontics in the future.
METHODS: An OTM-related healing model was established where a maxillary second premolar was protracted into the critical-sized defect for 6 weeks (group DT6). As controls, natural healing models without OTM were set at 2 weeks (group D2) and at 6 weeks (group D6) after surgery. Total RNAs were extracted from dissected tissue blocks containing the regenerated defects and additionally from sound alveolar bone as a baseline (group C). mRNA profiling was performed using microarray analysis.
RESULTS: Functional annotations of gene clusters based on differentially expressed genes among groups indicated that the gene expression profile of group DT6 had a stronger similarity to that of group D2 than to group D6. The genes participating in high woven-bone fraction in group DT6 could be identified as TNFSF11, MMP13, SPP1, and DMP1, which were verified by quantitative real-time polymerase chain reactions.
CONCLUSIONS: We investigated at the gene level that OTM can affect the healing state of surgical defects serving as favorable matrices for OTM with defect regeneration. It would be a basis on selecting putative genes to be therapeutically applied for tissue-friendly accelerated orthodontics in the future.
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