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ASM-Ceramide Axis Modulation Is Associated With TSLP Release and Epithelial Barrier Dysfunction in an In Vitro Type 2
International Archives of Allergy and Immunology
|August 3, 2026
Summary
Acid sphingomyelinase (ASM)-ceramide signaling is linked to thymic stromal lymphopoietin (TSLP) release and impaired epithelial barrier function in pediatric rhinitis models. Inhibiting ASM reduced TSLP and improved barrier integrity, suggesting a therapeutic target.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Epithelial barrier dysfunction is an early indicator in pediatric rhinitis.
- Upstream molecular events initiating this dysfunction are not fully understood.
- Interactions between lipid remodeling and epithelial-derived alarmins in type 2 inflammation are being investigated.
Purpose of the Study:
- To investigate the association between acid sphingomyelinase (ASM)-ceramide signaling and thymic stromal lymphopoietin (TSLP) release.
- To determine the role of this signaling pathway in epithelial barrier impairment in a pediatric rhinitis model.
Main Methods:
- Primary human nasal epithelial cells were stimulated with IL-4/IL-13 to mimic type 2 inflammation.
- Acid sphingomyelinase (ASM) was inhibited using ARC39, and TSLP was knocked down using siRNA.
- Measurements included TSLP levels (ELISA), barrier function (FITC-dextran, ZO-1), ceramide levels, and SMPD1 expression (qRT-PCR, Western blot).
Main Results:
- IL-4/IL-13 stimulation increased TSLP release and impaired epithelial barrier integrity.
- ARC39 treatment reduced ceramide levels and TSLP output in a dose-dependent manner.
- TSLP knockdown improved barrier function, with no additional benefit from combined ARC39 treatment.
Conclusions:
- Modulation of the ASM-ceramide axis is associated with TSLP release and epithelial barrier dysfunction in an in vitro model.
- These findings suggest a potential link between sphingolipid remodeling, epithelial alarmin responses, and barrier injury.
- Further mechanistic and clinical validation is required.
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