Regulation of inflammation by lipid mediators in oral diseases.
BACKGROUND A number of previous works have shown that leukotriene (LT) concentration emerged disease severity-dependent increases in both exhaled breath condensate and urine of sleep-disordered breathing (SDB) patients. However, few studies have investigated how circulating level of LTs contributes to systemic inflammation of SDB, and the relationship between LT production, leukocyte count and high sensitivity C-reactive protein (hsCRP) level in SDB disease remains controversial. METHODS Prospective, observational study that included standard questionnaires, physical examinations and polysomnography. Serum leukotriene B4 (LTB(4)) and cysteinyl leukotrienes (cysLTs) were determined by means of enzyme-linked immunosorbent assays. RESULTS A total of 166 children with SDB and 45 control subjects were recruited. SDB children had increased serum levels for both LTB(4) and cysLTs as well as neutrophil (Neu) count and hsCRP than the control group, and all the inflammatory parameters emerged disease severity-dependent increases. LT production correlated significantly with Neu count and hsCRP level. In the regression model, both apnea-hypopnea index and body mass index z-score were significant predictors of LTB(4) and cysLTs (p < 0.001). CONCLUSIONS The activated systemic inflammatory response as reflected by serum elevations of LTs, Neu counts and hsCRP is present in children with SDB, and the magnitude of inflammation emerged disease severity-dependent. The level of LTs is significantly associated with circulating Neu counts and hsCRP values in SDB.