Concentration of alpha-defensins in the blood plasma of children with Helicobacter pylori – associated peptic ulcer of the duodenum

Introduction. Various gastrointestinal and extragastric diseases are associated with H. pylori in children and adolescents, but the strongest testing and treatment guidelines are only for children and adolescents with peptic ulcer. The most promising developments now are the study of the antibacterial effect of endogenous antimicrobial peptides (AP), among which the most important are defenses 1-3 (human neutrophil peptides, HNPs1-3). Objective. To investigate the concentration of HNPs 1-3 in children with H. pylori-associated peptic ulcer of the duodenum (DU). Methods. A study of 65 children with DU (47 children with H. pylori-associated DU, 18 children with H. pylori-negative DU) and 25 healthy children aged 7-18 years with the determination of HNPs 1-3 levels in plasma. Results. More common was H. pylori in the group of children with III grade of inflammation than in the group of children with II grade (χ2:p<0.0001). A significant association was found between mucosal inflammation activity and the presence of H. pylori (r=0.66, p<0.0001). The mean level of HNP1-3 in healthy children was 13.67±0.96 ng/ml, in children with DU it was probably higher and was 104.88±11.5 ng/ml (p=0.005). There is a direct correlation between the level of HNP1-3 and the severity of DU in children (r=0.67, p>0.05), as well as between HNP1-3 and the activity of the inflammatory process (r=0.73, p>0.01). In children with H. pylori-associated DU, HNP1-3 values were significantly higher (107.34±16.18 [98.45-119.22]) ng/ml than those in children with DU not associated with H. pylori infection (66.70±11.31 [59.54-73.29]) ng/ml and in healthy children (13.67±0.96 [7.27-18.91] ng/ml). Conclusion. Elevated plasma HNP1-3 levels in children with DU in the presence of H. pylori are likely to be a protective response to limit infection that can be used as a potential biomarker of adverse events.