#Asthma #miRNA #Metabolome #Inflammation
#BronchialObstruction
Childhood asthma is a chronic inflammatory
disease of the airways, characterized by variable airflow obstruction, airway
hyperresponsiveness (AHR), and eosinophilic inflammation. This condition, whose
severity and symptoms vary widely between individuals, is one of the leading
causes of pediatric respiratory morbidity worldwide. Despite progress in the
classification of clinical phenotypes and the availability of therapeutic
options, the molecular mechanisms underlying the heterogeneity of the disease remain
poorly understood.
MicroRNAs (miRNAs), small non-coding RNAs that
regulate gene expression post-transcriptionally, play a central role in
orchestrating immune and inflammatory responses. At the same time,
metabolites—end products or intermediates of cellular metabolism—reflect the
complex interactions between genes, environment, and pathophysiological states.
While each of these elements has been studied individually in the context of
asthma, the cross-interaction between miRNAs and the metabolome had not yet
been examined in an integrated, large-scale analysis.
This is precisely the aim of this innovative
study, which leverages a combined multi-omic approach by integrating miRNAome
and metabolome data from two large, independent pediatric cohorts (CAMP and
GACRS). It seeks to identify robust associations between miRNA-metabolite
profiles and key clinical phenotypes of asthma—particularly eosinophilia,
bronchial obstruction, and hyperresponsiveness—in order to better understand
the molecular regulatory networks involved in disease expression.
Which miRNA matches which breath?
To decipher the molecular mechanisms behind
various clinical manifestations of pediatric asthma, this study performed an
integrative analysis using a
miRNAome-metabolome wide association study
(miMWAS) in two large independent cohorts of asthmatic children. This
multi-omic approach aimed to identify cross-interactions between circulating
microRNA (miRNA) profiles and plasma metabolites, focusing on three key
phenotypes: blood eosinophilia, bronchial hyperresponsiveness, and airway
obstruction.
The analysis revealed
369 significant
associations between
133 miRNAs and 60 metabolites, highlighting the existence
of
complex interaction networks. Among these,
13 metabolites and
4 miRNAs were
identified as
central hubs, suggesting a pivotal role in regulating biological
functions related to asthma. The most involved molecules include taurine,
12,13-diHOME, 9-cis retinoic acid, and
cortisol. Notably,
nine associations
remained stable over a
four-year period, reinforcing their value as potential
biomarkers.
Additionally, mediation analysis highlighted
five key metabolites mediating the effects of
59 miRNAs on the three major
clinical asthma phenotypes. Among these mediators, taurine and 12,13-diHOME
emerged as particularly central. Their metabolic pathways are targeted by
specific miRNAs that regulate gene expression involved in
inflammatory
responses, bronchial remodeling, and
immune tolerance. These findings suggest a
tight functional link between miRNA-mediated post-transcriptional regulation,
metabolic alterations, and the clinical expression of childhood asthma.
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Asthma rewritten in molecular code
Pediatric asthma is a chronic inflammatory
disease of the airways, with biological mechanisms that remain only partially
understood. One of the main current challenges lies in understanding the
molecular factors that determine phenotype variability, particularly
eosinophilia, bronchial obstruction, and airway hyperresponsiveness. In this
context, exploring new biological pathways becomes essential to refine
diagnosis, predict clinical trajectories, and develop more targeted treatments.
This study aimed to assess the
cross-associations between microRNA profiles and the metabolome in children
with asthma, in order to better understand their combined impact on the
disease’s clinical manifestations. The results show that certain miRNAs influence
key asthma phenotypes through specific metabolic pathways, acting as indirect
regulators of pulmonary and immune homeostasis. The linoleic acid and vitamin A
pathways, in particular, emerge as central regulatory circuits.
These findings open promising perspectives for
identifying
diagnostic and prognostic biomarkers, as well as developing
new
therapeutic targets within a precision medicine framework. However, several
limitations should be considered: metabolomic coverage remains partial, the
analyses are limited to two cohorts, and the results require functional
validation. Further studies in
independent and diverse cohorts are essential to
confirm the robustness of the identified associations. Expanding integrated
multi-omic approaches—combining transcriptomics, metabolomics, and
environmental exposure—could deepen our understanding of asthma mechanisms.
These efforts lay the groundwork for a
new integrated approach to pediatric
asthma at the intersection of genomics, metabolism, and immunoregulation.
Read next: MicroRNAs & Microbiota: An Inflammatory Duo?
