Interleukin-31 expression and relation to disease severity in human asthma

Area of Science:

• Immunology
• Respiratory Medicine
• Allergology

Background:

• Interleukin 31 (IL-31) is a T helper type 2 cytokine implicated in allergic disease pathogenesis.
• The specific role of IL-31 in human asthma requires further elucidation.

Purpose of the Study:

• To quantify IL-31 levels in serum, bronchoalveolar lavage fluid (BALF), and bronchial tissue of asthma patients and healthy controls.
• To investigate the correlation between IL-31 levels and asthma severity.

Main Methods:

• Serum IL-31 levels were measured in 44 asthma patients and 22 controls.
• BALF and bronchial tissue were collected via bronchoscopy from a subset of subjects (9 asthmatics, 5 controls).
• IL-31, IL-31RA, and OSMR expression was analyzed in bronchial tissue.

Main Results:

• Serum and BALF IL-31 levels were significantly higher in asthma patients compared to controls.
• IL-31 and its receptor components (IL-31RA, OSMR) expression was more pronounced in severe asthma bronchial tissue.
• Serum IL-31 positively correlated with Th2 cytokines (IL-5, IL-13, TSLP), asthma severity, and total IgE.
• Serum IL-31 inversely correlated with asthma control and FEV1.

Conclusions:

• IL-31 is significantly elevated in asthma patients.
• IL-31 and its receptors are upregulated in severe asthma, particularly in bronchial tissue.
• IL-31 plays a crucial role in asthma pathogenesis and severity.