Recurrent infections and activation of the inflammatory response affect the prognosis of cystic fibrosis (CF). We investigated the relationship between inflammatory response, infection, and pulmonary function in CF.Main methods:
A clinical-cross-sectional study was conducted with 86 subjects: control group (CG, n = 31, the same age and sex of the CF group), and CF group (CFG, n = 55, age: 1–16 years), further distributed into CFG negative or positive bacteriology (CFGB−/CFGB+), and CFG negative or positive Pseudomonas aeruginosa (CFGPa−/CFGPa+). Using the Wald test, multiple linear regression (95% confidence interval) was performed between CG and CFG, and between CG and each of the CF subgroups (CFGB−/CFGB+ and CFGPa−/CFGPa+). The inflammatory markers evaluated were myeloperoxidase (MPO), adenosine deaminase (ADA) activities, interleukin-1beta (IL-1β), tumor necrosis factor-alpha (TNF-α), C-reactive protein (CRP), nitric oxide metabolites (NOx) levels, and total and differential leukocyte counts.Key findings:
After adjusting for sex and age, CFG compared to CG revealed an increase of MPO, IL-1β (P < 0.001 in all subgroups), and CRP: CFG (P = 0.002), CFGB− (P = 0.007), CFGB+ (P = 0.009), CFGPa− (P = 0.004) and CFGPa+ (P = 0.020). NOx (P = 0.001, P < 0.001), leukocytes (P = 0.002, P = 0.001), and neutrophils (P = 0.003, P < 0.001) were increased in CFGB+ and CFGPa+, respectively. A negative correlation between FEV1 and leukocytes (P = 0.008) and FEV1 and neutrophils (P = 0.031) resulted in CFG.Significance:
The inflammatory response characterized by the increase of MPO, IL-1β, and CRP is determinant for CF. Also leukocytosis due to neutrophilia determines the pulmonary function deficiency in this disease.