Gene expression profiling reveals a downregulation in immune-associated genes in patients with AS.

Abstract:

OBJECTIVE:To identify differentially expressed genes in peripheral blood mononuclear cells (PBMCs) from patients with ankylosing spondylitis (AS) compared with healthy individuals. METHODS:RNA was extracted from PBMCs collected from 18 patients with active disease and 18 gender-matched and age-matched controls. Expression profiles of these cells were determined using microarray. Candidate genes with differential expressions were confirmed in the same samples using quantitative reverse transcription-PCR (qRT-PCR). These genes were then validated in a different sample cohort of 35 patients with AS and 18 controls by qRT-PCR. RESULTS:Microarray analysis identified 452 genes detected with 485 probes which were differentially expressed between patients with AS and controls. Underexpression of NR4A2, tumour necrosis factor AIP3 (TNFAIP3) and CD69 was confirmed. These genes were further validated in a different sample group in which the patients with AS had a wider range of disease activity. Predictive algorithms were also developed from the expression data using receiver-operating characteristic curves, which demonstrated that the three candidate genes have approximately 80% power to predict AS according to their expression levels. CONCLUSIONS:The findings show differences in global gene expression patterns between patients with AS and controls, suggesting an immunosuppressive phenotype in the patients. Furthermore, downregulated expression of three immune-related genes was confirmed. These candidate genes were also shown to be strong predictive markers for AS.

journal_name

Ann Rheum Dis

authors

Duan R,Leo P,Bradbury L,Brown MA,Thomas G

doi

10.1136/ard.2009.111690

subject

Has Abstract

pub_date

2010-09-01 00:00:00

pages

1724-9

issue

9

eissn

0003-4967

issn

1468-2060

pii

ard.2009.111690

journal_volume

69

pub_type

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