Journal
RHINOLOGY
Volume 59, Issue 2, Pages 205-211Publisher
INT RHINOLOGIC SOC
DOI: 10.4193/Rhin20.551
Keywords
Chronic Rhinosinusitis with Nasal Polyps; mometasone resistance; P-glycoprotein; verapamil
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Funding
- Boston Biomedical Innovation Center
- Massachusetts Eye and Ear Summit Grant
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The overexpression of P-glycoprotein in nasal polyp explants is significantly correlated with reduced retention and efficacy of mometasone. Inhibition of P-gp using verapamil enhances mometasone retention and anti-inflammatory function, leading to a significant reduction in IL-5 secretion. Combination therapy of mometasone and verapamil shows improved efficacy compared to either treatment alone.
Background: P-glycoprotein (P-gp) is a membrane efflux pump which is overexpressed in Chronic Rhinosinusitis with Nasal Polyps (CRSwNP) and promotes Type 2 inflammation. Glucocorticoids (GC) are substrates of P-gp suggesting that overexpression may additionally contribute to GC resistance in CRSwNP. This study aims to determine whether P-gp inhibition using verapamil enhances mometasone retention and efficacy in nasal polyp explants. Methodology: IRB approved study in which organotypic polyp explants were exposed to mometasone (4.15 mu g/mL) and verapamil (125 mu g/mL) as mono and combination therapy. The effect of verapamil on mometasone tissue retention over time was determined using HPLC. The effect of verapamil on mometasone anti-inflammatory function was determined using ELISA for secreted IL-5. Groups were compared using Kruskal-Wallis test. Results: P-gp expression strongly and significantly inversely correlated with mometasone retention 1hr after exposure, with a nearly 6-fold reduction in tissue retention between the lowest and highest P-gp expressing polyp explants. P-gp inhibition reversed this effect and significantly improved mometasone retention at 1hr relative to mometasone alone. The combination of mometasone and verapamil significantly reduced IL-5 secretion relative to vehicle control and outperformed either treatment alone. Conclusions: Our study confirms that P-gp contributes to mometasone resistance. This P-gp mediated resistance was successfully reversed by addition of the P-gp inhibitor verapamil. Verapamil further significantly enhanced the anti-inflammatory effect of mometasone when given as a combination therapy.
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