Abstract
Background
Antimicrobial peptides are components of innate immune response that have a key role on susceptibility and resistance of the oral cavity to diseases. This study aimed to investigate the influence of smoking on cathelicidin LL‐37 and human neutrophil peptides 1 through 3 (HNP 1‐3) levels in the gingival crevicular fluid (GCF) of patients with periodontitis. The relationship between levels of these peptides with the periodontal status and selected inflammatory mediators levels in smokers and non‐smokers was also evaluated.
Methods
Forty patients with periodontitis, 20 smokers and 20 non‐smokers were recruited. After a full periodontal clinical assessment, GCF samples were collected from healthy (n = 5) and diseased (n = 5) sites of each patient. Peptides and inflammatory mediators in the GCF were quantitated by sandwich ELISAs and Multiplex assay, respectively.
Results
Diseased sites had significantly (p<0.05) higher levels of LL‐37 and lower levels of HNP 1‐3 than healthy sites in both smokers and non‐smokers. Diseased sites of smokers presented significantly lower levels of LL‐37 and HNP 1‐3 when compared to diseased sites of non‐smokers. Concentration of LL‐37 was directly correlated with the presence of pro‐inflammatory mediators MMP‐8 and IL‐1β and inversely correlated with concentration of IL‐10. HNP 1‐3 concentration was positively correlated with IL‐10 and negatively correlated with concentrations of MMP‐8 and IL‐1β.
Conclusion
Smoking was associated with reduced levels of LL‐37 and HNP 1‐3 in GCF of patients with periodontitis. LL‐37 had a distinct expression pattern from HNP 1‐3: LL‐37 was upregulated in diseased sites, and HNP 1‐3 were increased in periodontally heathy sites.
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https://aap.onlinelibrary.wiley.com/doi/abs/10.1002/JPER.20-0098?af=R
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