Table 1: Mechanisms of airflow obstruction in patients with neutrophilic asthma.

Airway neutrophil recruitment, Migration, and Activation
Release of cytokines, Chemokines, Growth factors, and Adhesion molecules
Airway epithelial damage and further release of cytokines
Goblet cells hyperplasia and Mucus hypersecretion
Airway hyperresponsiveness
Subepithelial fibrosis
Airway smooth muscle proliferation
Airway remodeling
Corticosteroid resistance