Curcumin Attenuates Airway Inflammation and Airway Remolding by Inhibiting NF-κB Signaling and COX-2 in Cigarette Smoke-Induced COPD Mice
The purpose of this study is to evaluate the therapeutic effects of curcumin on airway inflammation using LPS and cigarette smoke (LC)-induced COPD murine models and LPS-stimulated human bronchial epithelial (BEAS-2B) cells. In this research, COPD murine models were established after challenged with LPS for 2 days and exposed to cigarette smoke for 35 days. Treatment with curcumin for 10 days distinctly alleviated airway inflammation and airway remolding in LC-induced COPD mice according to the lung H&E histopathological examination. The number of neutrophils and lymphocytes in broncho alveolar lavage fluid (BALF) was significantly decreased in curcumin+LC-treated group compared with the LC-induced mice. Additionally, curcumin inhibited BEAS-2B cells proliferation, which suggested the preventive effect of curcumin on progressive airway remolding and inflammatory response mediated by bronchial epithelial cells. Further investigation demonstrated an underlying molecular mechanism for the therapeutic effects of curcumin may rely on the inhibition of the degradation of IκBα and COX-2 expression in curcumin+LC-treated COPD mice and LPS-stimulated BEAS-2B cells. Overall, curcumin alleviates the airway inflammation and airway remolding, which is closely related to inhibit the BEAS-2B cells proliferation and suppress the activation of NF-κB and COX-2 expression. These findings indicate that curcumin may be a potential agent for the therapy of COPD.
KEY WORDSCurcumin COPD NF-κB COX-2 Inflammation
Chronic obstructive pulmonary disease
Bronchoalveolar lavage fluid
Phosphate-buffered physiological saline
LPS + cigarette smoke
Transforming growth factor-β
Bronchial epithelial cells
This work was supported by the Department of Science and Technology Program Funds of Jiangxi Province, China (No. 20151BAB205085).
Compliance with Ethical Standards
The entire experiments were reviewed and proved by the Institutional Animal Experimental Ethics Committee of Nanchang University.
Conflict of Interest
The authors declare that they have no conflicts of interest.
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