Effect of Quercetin on Rhinitis via Inflammatory Pathway

Abstract

Asthma is a chronic inflammatory airway disease, characterized by reversible goblet cells, smooth muscle hyperplasia, airflow obstruction, hyperactivity enhanced, ultra-structural remodeling, and airway mucus production. The current experimental study was aimed at scrutinizing quercetin’s inhibitory effect on airway inflammation in mice and its possible mechanism of action. The mice received varying doses of quercetin from 22-30 days (1, 10 and 50 mg / kg, p.o.) and montelukast (10 mg / kg, p.o.). Intranasal OVA has been instilled on the 21 days. Biochemical parameters, spleen weight, physiological parameters, interleukin (IL-1β and IL-6) parameters and immunoglobin-E (IgE) were calculated at the end of the experimental study. To investigate the potential mechanism of action, Paw edema and mast cell degranulation are estimated. Used to measure immune and inflammatory mediators, qRT-PCR technique. Quercetin significantly (P<0.001) reduced IgE levels in the asthma mice serum. Inflammatory cells in the mice BALF are significantly reduced in a dose-dependent manner through quercetin. Quercetin (P<0.05) significantly reduced the level of TNF-α, IL-1β, IL-4 and IL-5 cytokines and increased the level of IFN-π in allergic asthma mice caused by OVA. In contrast, there was no significant effect in the body weight of mice treated with quercetin. Based on the result, we may infer that quercetin demonstrates an inflammatory mechanism for the therapeutic effect of inflammation in allergic asthma.