Total immunoglobulin E levels in induced sputum reflect asthma control status

Area of Science:

• Allergy and Immunology
• Pulmonary Medicine
• Biomarker Discovery

Background:

• Severe asthma often involves allergen sensitization.
• The role of local sputum immunoglobulin E (IgE) in reflecting asthma control remains unexplored.

Purpose of the Study:

• To investigate if local sputum IgE levels correlate with asthma control status.
• To determine if sputum IgE can serve as a biomarker for uncontrolled asthma.

Main Methods:

• Asthma patients were categorized into well-controlled, partly controlled, and uncontrolled asthma (UCA) groups.
• Lung function, fractional exhaled nitric oxide (FeNO), and sputum total IgE/Phadiatop were measured.
• Logistic regression and ROC curve analysis assessed the relationship between sputum IgE and asthma control.

Main Results:

• Uncontrolled asthma patients exhibited poorer lung function and higher airway inflammation (FeNO, sputum eosinophils).
• Higher sputum total IgE and Phadiatop levels were observed in UCA patients.
• Sputum total IgE was a significant predictor of poor asthma control (aOR=6.25) and correlated with asthma control scores (r=0.53).

Conclusions:

• Sputum total IgE levels effectively reflect asthma control status.
• Sputum total IgE can be utilized as a valuable indicator for identifying uncontrolled asthma.