Online first
Original paper
Published online: 2024-08-26
Nootkatone mitigates periodontal inflammation and reduces alveolar bone loss via Nrf2/HO-1 and NF-κB pathways in rat model of periodontitis
DOI: 10.5603/fhc.101862
Pubmed: 39192685
Abstract
Introduction. Periodontitis (PD) is a chronic inflammatory disease leading to alveolar bone loss. This study investigates the effect of nootkatone and regulatory mechanism in reducing periodontal inflammation and alveolar bone loss in a rat model.
Material and methods. Twenty male Sprague-Dawley rats were divided into control, periodontitis, and nootkatone-treated groups (45 or 90 mg/kg). Ligature induction method was adopted to establish the PD model. After 21 days, rats received daily gavage of either saline or nootkatone for 10 days. Alveolar bone loss was assessed using micro-CT. Histological analyses included hematoxylin and eosin (H&E), tartrate-resistant acid phosphatase (TRAP), and Masson’s trichrome stainings. Immunohistochemistry for heme oxygenase 1 (HO-1) and nuclear factor erythroid-2 related factor 2 (Nrf2) were performed in periodontal tissues. Content of inflammatory cytokines IL-1β, IL-6, and TNF-α in gingival tissues around ligature were assessed using ELISA kits. Malondialdehyde (MDA) level and superoxide dismutase (SOD) activity were analyzed and Western blot for NF-κB expression in gingival tissues were performed.
Results. Nootkatone significantly reduced the distance from cementoenamel junction to alveolar bone crest (CEJ-ABC), enhanced bone mineral density (BMD), bone volume (BV), and BV/total volume (TV) ratio in ligature-induced rats. Higher dose of nootkatone (90 mg/kg) did not show more significant therapeutic effect than lower dose (45 mg/kg). Histological staining showed decreased osteoclasts’ number and improved bone architecture in the nootkatone group. Content of IL-1β, IL-6, and TNF-α and inflammatory cell infiltration level in gingival tissues around the ligature were decreased by the nootkatone-treatment rats. Nootkatone increased Nrf2 and HO-1 protein expression and decreased NF-κB protein level, suppressing MDA levels and enhancing SOD activity.
Conclusions. In a rat model, nootkatone effectively mitigates periodontal inflammation and alveolar bone loss through the Nrf2/HO-1 and NF-κB pathways. These findings suggest nootkatone as a promising therapeutic agent for the treatment of periodontitis.
Keywords: nootkatoneperiodontitisalveolar bone losscytokinesoxidative stressNF-κB
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