Sublingual prophylactic administration of OVA-loaded MSC-derived exosomes to prevent allergic sensitization

Aim: This study evaluated the immunomodulatory and delivery potential of adipose tissue-isolated MSC-derived exosomes as a prophylactic regimen through a sublingual route in the ovalbumin (OVA)-induced allergic asthma murine model.Material and methods: Balb/c mice received 10 & mu;g/dose of OVA-enriched MSC-derived exosomes as a prophylactic regimen in six doses during three weeks, and then OVA sensitization was conducted through intraperitoneal and aerosol administration of allergen. The total cells and eosinophils counted in nasal lavage fluid (NALF) and lung tissues were assessed for histopathological analysis. In addition, the secretion of IFN-& gamma;, IL-4, and TGF-& beta; by spleen cells and serum OVA-specific IgE levels were measured via ELISA.Results: Significant reduction in the IgE levels and IL-4 production, along with elevated TGF-& beta; levels, were observed. Also, limited cellular infiltrations and perivascular and peribronchiolar inflammation in the lung tissues and normal total numbers of cells and eosinophils in the NALF were reported.Conclusion: Prophylactic regimen using OVA-enriched MSC-derived exosomes modulated immune responses and inhibited allergic OVA sensitization.