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Objective Endoplasmic Reticulum(ER)stress has been considered as an important regulator of airway inflammation in the pathogenesis of bronchial asthma,but the mechanism of ER stress involved in neutrophilic asthma remain not fully understood.Methods In the present study,we built the mouse bronchial epithelial cell model and the neutrophilic asthma model (OVALPSOVA mice).Then,tunicamycin was administered in cells and OVALPS-OVA mice,and ER stress indicators and inflammatory cytokines were measured by western blot and Elisa.