John S. Dennis

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About

John S. Dennis is a leading respiratory researcher whose work focuses on the molecular mechanisms of mucociliary dysfunction in chronic lung diseases, particularly those induced by tobacco smoke. His most cited study, "Roflumilast partially reverses smoke-induced mucociliary dysfunction" (2015, 38 citations), made a pivotal contribution by demonstrating that the PDE4 inhibitor roflumilast can restore cystic fibrosis transmembrane conductance regulator (CFTR) function in airway epithelial cells exposed to cigarette smoke. By elucidating how PDE4 inhibition elevates intracellular cAMP levels to counteract smoke-induced CFTR suppression, Dennis provided a mechanistic foundation for repurposing this anti-inflammatory drug to treat mucociliary clearance defects in smokers and COPD patients. This work bridges fundamental cell signaling research with translational therapeutic strategies, offering hope for reversing airway damage in millions of smokers worldwide. Dennis’s findings have been widely cited in studies exploring CFTR modulation beyond cystic fibrosis, underscoring their impact on respiratory pharmacology. His research continues to shape our understanding of how phosphodiesterase pathways regulate airway homeostasis, positioning him as a key figure in the fight against smoking-related lung disease.