Cannabinoid receptor 2 affect the inflammatory response in periodontitis by regulating macrophage M1/M2 polarization
Year: 2025
Type: article
Abstract: This study investigated the effect of cannabinoid receptor 2 (CB2R) on macrophage polarization and inflammatory severity in periodontitis, elucidating CB2R’s potential role in the disease. Chronic periodontitis was induced by ligating maxillary second molars with orthodontic filaments in wild-type (WT) and CB2R knockout (CB2R -/- ) mice. Unligated mice served as controls. After 3 weeks, maxillae were harvested. Micro-CT evaluated modeling success and quantified alveolar bone resorption. HE staining assessed periodontal tissue destruction. Immunohistochemistry (IHC) analyzed macrophage polarization, while RT-qPCR measured mRNA levels of macrophage markers and inflammatory cytokines. 1. Micro-CT revealed significantly greater alveolar bone resorption in both CB2R -/- and WT periodontitis groups versus controls ( P < 0.05), with CB2R -/- mice exhibiting more severe resorption than WT mice.2. HE staining demonstrated increased bone loss, inflammatory infiltration, and tissue destruction in periodontitis groups, most pronounced in CB2R -/- mice.3.IHC indicated elevated M1/M2 macrophage markers in periodontitis groups. M1 marker iNOS expression was significantly higher in CB2R -/- versus WT mice ( P < 0.05), while M2 marker Arg-1 showed no intergroup difference ( P < 0.05)0.4.RT-qPCR confirmed upregulated macrophage markers and inflammatory cytokines in periodontitis groups, with significantly higher expression in CB2R -/- mice ( P < 0.05). CB2R -/- mice also exhibited elevated M1/M2 and IL-6/IL-10 ratios versus WT mice ( P < 0.05). CB2R deficiency exacerbates alveolar bone resorption and inflammatory severity in periodontitis, potentially by dysregulating macrophage M1/M2 polarization and inflammatory cytokine expression.
Source: BMC Oral Health
Authors: Shu-Yue Yuan, Fei Zhao, Ran Tao, Bing Liu, Chun-Yan Liu
Institution: Hebei Medical University
Language: English
Subfield: Periodontics
Field: Dentistry
Domain: Health Sciences
Open Access status: gold
Estimated APC paid: $3,190
OpenAlex ID: W4416724974