House dust mite exposure enhances immune responses to ovalbumin-induced intestinal allergy

Area of Science:

• Immunology
• Allergology
• Gastroenterology

Background:

• House dust mites (HDM) are implicated in airway allergic diseases.
• HDM allergens can infiltrate the gut mucosa, causing inflammation and increased intestinal permeability.
• The role of HDM in the development of food allergies requires further investigation.

Purpose of the Study:

• To test the hypothesis that HDM contribute to the development of ovalbumin (OVA)-induced intestinal allergy.
• To investigate the impact of HDM exposure on immune responses and intestinal barrier function in a food allergy model.

Main Methods:

• Serum levels of IgE against HDM were measured in food allergy patients.
• A mouse model of food allergy was established using OVA and HDM as antigens.
• Allergy-like symptoms, body temperature, body weight, immune markers (IgE, IgG1, mMCP-1, IL-4, IL-5), and intestinal pathology were assessed.

Main Results:

• Patients with food allergy showed higher HDM-specific IgE levels, particularly those with co-existing asthma or allergic rhinitis.
• HDM/OVA exposure in mice induced allergy-like symptoms, reduced body weight, and increased levels of IgE, IgG1, IL-4, and IL-5.
• Intestinal tissues exhibited more severe pathological changes and eosinophil infiltration in HDM-exposed groups.
• HDM exposure led to intestinal barrier dysfunction and facilitated the development of intestinal allergy.

Conclusions:

• HDM exposure significantly enhances immune responses to OVA-induced food allergy.
• HDM acts as a contributing factor to the development and exacerbation of intestinal allergic conditions.
• These findings highlight the importance of considering HDM in the context of food allergies and gut health.