Distinct effects of endogenous interleukin-23 on eosinophilic airway inflammation in response to different antigens

Allergology International : Official Journal of the Japanese Society of Allergology
Rika OgawaKoichiro Asano

Abstract

The role of interleukin (IL)-23 in asthma pathophysiology is still controversial. We examined its role in allergic airway inflammation in response to two distinct antigens using IL-23-deficient mice. Allergic airway inflammation was evaluated in wild-type and IL-23p19(-/-) mice. Mice were sensitized to ovalbumin (OVA) or house dust mite (HDM) by intraperitoneal injection of antigen and their airways were then exposed to the same antigen. Levels of antigen-specific immunoglobulins in serum as well as cytokines in bronchoalveolar or peritoneal lavage fluid and lung tissue were determined by enzyme-linked immunosorbent assay and/or quantitative polymerase chain reaction. Deficiency of IL-23p19 decreased eosinophils and Th2 cytokines in bronchoalveolar lavage fluid (BALF) of OVA-treated mice, while it increased BALF eosinophils of HDM-treated mice. Peritoneal injection of OVA with alum, but not of HDM, induced local synthesis of IL-6, IL-10, and IL-23. Systemic production of antigen-specific IgG1 was partially dependent on IL-23. In contrast, airway exposure to HDM, but not to OVA, induced IL-23p19 mRNA expression in the lungs. In IL-23p19-deficient mice, HDM-exposed lungs did not exhibit the induction of IL-17A, which negatively r...Continue Reading

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