Abstract
Periodontal disease is an inflammatory disease caused by periodontopathogenic bacteria, the inflammatory response generated against them, and host factors. Furthermore, environmental factors can lead to disease progression. Using lipopolysaccharide (LPS)-stimulated human gingival fibroblast (HGF), this study investigated the bioactivity of HGF after exposure to hesperidin (Hesp) and the anti-inflammatory activity of Hesp against early periodontitis. HGF were cultured in Dulbecco's modified Eagle's medium containing 15% fetal bovine serum. They were exposed to LPS for 6h, followed by Hesp (1, 10, 30, and 50µM) exposure for 4h. Cell proliferation was evaluated using reduction staining with alamerBlue™. Inflammatory cytokines [interleukin (IL)-6 and IL-8] and Toll-like receptor 4 (TLR4) levels were assessed using reverse transcription quantitative polymerase chain reaction. Hesp 50µM + LPS inhibited cell proliferation. The Hesp exposure group inhibited the expression of IL-8 and IL-6. No significant difference in TLR4 expression was observed. Hesp significantly suppressed IL-6 and IL-8 expression by inhibiting downstream signaling without inhibiting TLR4 activation.
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