Suppressive Effect of Quercetin on Nitric Oxide Production from Nasal Epithelial Cells In Vitro

Figure 1

Influence of IL-4 stimulation on NO production from HNEpCs in vitro. HNEpCs at 1 x 10⁵ cells/ml are stimulated with different concentrations of IL-4 for 24 to 72 hours. NO levels in the culture supernatants are measured using the Griess method, and the results are expressed as the mean μM ± SE of the triplicate cultures. (a) Dose-response profile of IL-4 on NO production; (b) time course of IL-4-induced NO production. The experiments are performed twice with similar results. Med. alone: medium alone; IL-4: interleukin-4; NO: nitric oxide; HNEpCs: human nasal epithelial cells.

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