Effect of smoking on salivary free amino acid levels

Abstract

Objective The aim of this study was to identify probable intermediate biomarkers of disturbed pathways and their link between smoking. Methods Un-stimulated whole saliva and serum samples were collected from a total of 30 systemically healthy participants with periodontally healthy smokers (S) (n=15) and non-smokers (n=15). Periodontal indices (plaque index, gingival index, probing depth, bleeding on probing, clinical attachment level) were recorded to confirm periodontal health. Saliva was purified, and a total of 28 amino acids and metabolites were analyzed by liquid chromatography-mass spectrometry (LC-MS/MS). Smoking status was validated measuring serum cotinine levels. Intergroup comparisons were assessed using the Mann Whitney U test. Results When 28 amino acids were evaluated, smokers had statistically significantly higher cystathionine levels than non-smokers (p<0.05). Conclusions Saliva cystathionine is associated with smoking in periodontally healthy individuals, and is possibly related to altered sulfuration pathway.

Keywords

• saliva amino acids
• smoking