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Updated: Jan 21, 2026
08:44
Identification and Characterization of Immunogenic RNA Species in HDM Allergens that Modulate Eosinophilic Lung Inflammation
Published on: May 30, 2020
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Allergen presensitization drives an eosinophil-dependent arrest in lung-specific helminth development
Pedro H Gazzinelli-Guimaraes1, Rafael de Queiroz Prado1, Alessandra Ricciardi1
1Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland, USA.
The Journal of Clinical Investigation
|August 6, 2019
Summary
Preexisting allergy to house dust mites enhances the immune system's ability to fight parasitic worms. Allergic responses in the lungs reduce worm burden by activating eosinophils, crucial for parasite control.
Area of Science:
- Immunology
- Parasitology
- Allergy Research
Background:
- Investigates the impact of pre-existing allergy on helminth infection outcomes.
- Reverses the traditional approach focusing on helminth infection preceding allergy.
Purpose of the Study:
- To determine if allergic sensitization influences the host's response to helminth infection.
- To elucidate the immune mechanisms involved in this interaction.
Main Methods:
- Utilized a murine model of house dust mite (HDM)-induced allergic inflammation followed by Ascaris infection.
- Assessed the role of eosinophils and CD4+ T cells in the host's defense against helminths.
Main Results:
- Allergic sensitization induced an eosinophil-rich type 2 immune response in the lungs, hindering Ascaris larval development and reducing parasite burden.
- Eosinophil-deficient mice showed impaired parasite control.
- Blocking CD4+ T cells reversed the protective effect, indicating their crucial role.
Conclusions:
- HDM allergic sensitization primes a protective immune response against early-stage helminth infection.
- CD4+ T cell-mediated, eosinophil-dependent killing of helminth larvae occurs in lung tissue.
- This highlights tissue-specific immune mechanisms conferring protection against parasitic infections.
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