Expression data from CRS with nasal polyps (CRSwNP) and normal control

Chronic rhinosinusitis (CRS) is a prevalent chronic rhinologic disease, characterized by persistent symptomatic inflammation of the nasal mucosa and paranasal sinuses. Sinonasal tissues were obtained during sinus surgeries performed at Northwestern University. For the microarray, NP tissues and uncinate tissues from normal healthy controls were divided into elderly (≥65 years old, each n=3-4), or non-elderly (18-49 years old, each n=3-4) according to age. This study protocol was approved by the independent ethics committees or institutional review boards (IRB) at Northwestern University. Total RNA was isolated from NP tissues and control uncinate tissues. RNA concentration was calculated, and the highest quality RNA used for microarray. The quality of total RNA was evaluated by Bioanalyzer (Agilent Technologies, Santa Clara, CA). The samples were at a concentration ≥125ng/μl and a A260/A280 ratio that was ≥1.80 and a RIN value that was ≥7.0 were considered acceptable. The highest quality RNA was used to generate labeled cRNA and hybridized to Affymetrix Human Gene 2.1ST array following the manufacturer’s protocol (Affymetrix Inc., Santa Clara, CA). Chip processing and image capturing were performed using Affymetrix AGCC software. We investigated age- and disease-related differential gene expression in chronic rhinosinusitis with nasal polyps. Microarrays using NP and uncinate tissues from health controls (elderly, age ≥65 vs. non-elderly, age 18-49) were performed, and gene expression profiles were evaluated using Affymetrix Human Gene 2.1ST array.