Advances in the Gut‐Lung Axis and Bronchial Asthma: From Mechanisms to Therapeutic Potential

Gut microbiota and their metabolites exert profound effects on pulmonary immune homeostasis through immune modulation, metabolic signaling, and neuroendocrine pathways, which are critically implicated in asthma pathogenesis. Conversely, systemic immune dysregulation in asthma may reciprocally induce intestinal barrier dysfunction. Asthma is a variable disease here. It may be that some of this variability relates to different diets or environmental/gut exposures although this needs to be confirmed in human studies. This review comprehensively delineates the mechanistic role of the gut-lung axis in asthma, encompassing microbiota-immune system interactions, regulatory effects of microbial-derived metabolites such as short-chain fatty acids (SCFAs) and bile acids, and microbiota-targeted therapeutic approaches including probiotics, dietary interventions, and metabolite-based therapies. Furthermore, we also discuss the limitations and future development directions of current research to provide new ideas for precision treatment of asthma.