Interleukin (IL)-1β,IL-6,Tumor Necrosis Factor-α,Epidermal Growth Factor,and β2-Microglobulin Levels Are Elevated in Gingival Crevicular Fluid during Human Orthodontic Tooth Movement

Abstract

Bone remodeling is a complex process regulated by several mediators. Recent work has revealed that cytokines and growth factors have significant effects on bone cell metabolism. However, little information is available concerning the production of cytokines during orthodontic tooth movement in human subjects, and there is no non-invasive model for determining the production of cytokines. Therefore, the purpose of this study was to identify and quantify the various cytokines in human gingival crevicular fluid (GCF), and to investigate the changes in their levels during orthodontic tooth movement. Twelve patients (mean age, 14.4 years) were used as subjects. An upper canine of each patient having one treatment for distal movement served as the experimental tooth, whereas the contralateral and antagonistic canines were used as controls. The GCF around the experimental and the two control teeth was taken from each subject immediately before activation, and at 1, 24, and 168 hr after the initiation of tooth movement. Cytokine levels were determined by ELISAs. The concentrations of interleukin (IL)-1β, IL-6, tumor necrosis factor-a, epidermal growth factor, and β₂-microglobulin were significantly higher in the experimental group than in the controls at 24 hr after the experiment was initiated. All the cytokines remained at baseline levels throughout the experiment for the two control groups. In contrast to cytokine alteration, the amount of total protein in the GCF exhibited a gradual increase, but no significant difference was observed between the control and experimental groups. Since all cytokines in GCF play an important role in the bone remodeling processes in vitro, the present results indicate that the changes in cytokines in GCF are associated with orthodontic tooth movement.

Keywords

IL-1β IL-6 TNF-a EGF β2-microglobulin GCF orthodontic tooth movement

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