The investigation of the role of oral-originated induced inflammation in childhood asthma.

BACKGROUND AND OBJECTIVES

The oral and gut microbiota play significant roles in childhood asthma pathogenesis. However, the communication dynamics and pathogenic mechanisms by which oral microbiota influence gut microbiota and disease development remain incompletely understood. This study investigated potential mechanisms by which oral-originated gut microbiota, specifically genus, may contribute to childhood asthma etiology.

METHODS

Oral swab and fecal samples from 30 asthmatic children and 30 healthy controls were collected. Microbiome composition was characterized using gene sequencing and metagenomics. Genetic distances identified potential oral-originated bacteria in asthmatic children. Functional validation assessed pro-inflammatory properties of predicted microbial mimicry peptides from enriched asthma-associated species. Fecal metabolome profiling combined with metagenomic correlations explored links between gut microbiota and metabolism. HBE cells treated with culture supernatant were analyzed for lipid pathway impacts using UPLC-MS/MS.

RESULTS

Children with asthma exhibited distinct oral and gut microbiota structures. and were enriched orally and intestinally in asthmatics, while decreased. and in asthmatic gut likely originated orally. Microbial peptides induced inflammatory cytokines from immune cells. Aberrant lipid pathways characterized asthmatic children. increased pro-inflammatory and decreased anti-inflammatory lipid metabolites in HBE cells.

CONCLUSION

This study provides evidence of transfer from oral to gut microbiota in childhood asthma. 's microbial mimicry peptides and effects on lipid metabolism contribute to disease pathogenesis by eliciting immune responses. Findings offer mechanistic insights into oral-gut connections in childhood asthma etiology.