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Updated: Dec 23, 2025
Identification and Characterization of Immunogenic RNA Species in HDM Allergens that Modulate Eosinophilic Lung Inflammation
Published on: May 30, 2020
The importance of reporting house dust mite endotoxin abundance: impact on the lung transcriptome
Christopher D Pascoe1,2, Aruni Jha1,2, Sujata Basu2
1Department of Physiology and Pathophysiology, University of Manitoba, Winnipeg, Manitoba, Canada.
Abstract:
The abundance of lipopolysaccharide (LPS) in house dust mite (HDM) preparations is broad and mirrors the variability seen in the homes of people with asthma. LPS in commercially available stocks ranges from 31 to 5,2000 endotoxin units. The influence of vastly different LPS loads on the mechanisms that define the immune and inflammatory phenotype of HDM-challenged mice has not been defined. This aim of the study was to understand the lung phenotype of mice challenged with HDM extract containing high or low levels of LPS. Female BALB/c mice were sensitized for 2 wk with commercial HDM extract containing either high (36,000 endotoxin units; HHDM) or low (615 endotoxin units; LHDM) levels of LPS. Lung phenotype was characterized by measuring lung function, total and differential cell counts, cytokine abundance, and the lung transcriptome by RNA-sequencing. LPS levels in HDM stocks used for preclinical asthma research in mice remain poorly reported. In 2019, only 14% of papers specified LPS concentration in HDM lots. Specific differences existed in airway responsiveness between mice challenged with HHDM or LHDM. HHDM- and LHDM-induced cytokine profiles of bronchial lavage were significantly different and the lung transcriptome was differentially enriched for genes involved in DNA damage repair or cilium movement, following HHDM or LHDM challenge, respectively. The abundance of LPS in commercially available HDM influences the phenotype of allergic airways inflammation in mice. Failure to report the level of LPS in HDM extracts used in animal models of airway disease will lead to inconsistency in reproducibility and reliability of published data.
Insights
The amount of lipopolysaccharide (LPS) in house dust mite (HDM) extracts significantly impacts allergic airway inflammation in mice. Reporting LPS levels is crucial for consistent and reliable asthma research.
Area of Science:
- Immunology
- Pulmonology
- Genomics
Background:
- Lipopolysaccharide (LPS) levels vary widely in house dust mite (HDM) preparations, similar to real-world exposures.
- The impact of differing LPS concentrations on the immune and inflammatory responses in HDM-challenged mice is not well understood.
- Inconsistent reporting of LPS levels in HDM used in preclinical asthma research hinders reproducibility.
Purpose of the Study:
- To investigate the lung phenotype of mice exposed to HDM extracts with high versus low LPS loads.
- To define how varying LPS concentrations influence immune and inflammatory mechanisms in an asthma model.
Main Methods:
- Female BALB/c mice were sensitized with HDM extracts containing high (36,000 EU) or low (615 EU) LPS levels.
- Lung function, cellular counts, cytokine profiles, and lung transcriptome were analyzed.
- RNA-sequencing was employed to examine gene expression differences.
Main Results:
- Significant differences in airway responsiveness were observed between high LPS (HHDM) and low LPS (LHDM) groups.
- Cytokine profiles in bronchial lavage fluid differed significantly between HHDM and LHDM challenges.
- The lung transcriptome showed differential enrichment for DNA damage repair genes (HHDM) and cilium movement genes (LHDM).
Conclusions:
- The concentration of LPS in HDM extracts critically influences the development of allergic airway inflammation in mouse models.
- Accurate reporting of LPS levels in HDM used in animal studies is essential for ensuring the reproducibility and reliability of research findings in airway disease.
