comparison of matrix metalloproteinase-3 and tissue inhibitor of matrix metalloproteinase-1 levels in gingival crevicular fluid in periodontal health, disease and after treatment: a clinico biochemical study

background: considering the role of matrix metalloproteinase-3 (mmp-3) and tissue inhibitor of matrix metalloproteinase-1 (timp-1) in the pathogenesis of periodontitis, the present study is to estimate the levels of mmp-3 and timp-1 in gingival crevicular fluid (gcf) in periodontal health, disease and to evaluate the effect of periodontal therapy on mmp-3 and timp-1 concentrations in gcf. materials and methods: a periodontal examination and collection of gcf by extra-crevicular method was performed in 30 subjects selected randomly and categorized into 3 groups. group i consists of 10 subjects group ii consists of 20 patients and group iii consists of 20 patients of group ii. non surgical periodontal therapy was performed, and gcf was collected after 8 weeks from the same site of 20 chronic periodontitis patients who are considered as group iii. mmp- 3 and timp-1 levels were estimated in gcf-samples by using enzyme-linked immunosorbent assay. the findings were analyzed using the software and descriptive statistical methods such as mann- whitney u-test and kruskal-wallis test. p value < 0.001 was considered significant. results: mmp-3 and timp-1 was detected in all samples. highest mean mmp-3 concentrations in gcf were obtained for group ii (7.490 ng/ml) while the lowest concentrations were seen in group i (0.344 ng/ml) and group iii (2.129 ng/ml). this suggests that mmp-3 levels in gcf increases proportionally with the progression of periodontal disease and decreases after treatment. lowest mean timp-1 concentrations in gcf were obtained for group-ii (1.592 ng/ml), while the highest concentrations were seen in group-i (8.78 ng/ml) and group-iii (6.40 ng/ml). this suggests that timp-1 levels in gcf decreases proportionally with progression of periodontal disease and increases after treatment. conclusion: there is a substantial increase in the concentrations of mmp-3 and decrease in timp-1 as periodontal disease progress. since mmp-3 and timp-1 levels in gcf are positively correlated with gingival index, probing pocket depth, and clinical attachment loss, mmp-3, and timp-1 may be considered as a “novel biomarkers” in periodontal disease. however, controlled, longitudinal studies are needed to confirm this possibility. key words: gingival crevicular fluid, matrix metalloproteinase-3, periodontal disease, scaling and root planning, tissue inhibitor of matrix metalloproteinase-1