Anti-PDGFR-alpha antibodies measured by non-bioactivity assays are not specific for systemic sclerosis.

Abstract:

OBJECTIVE:To evaluate the presence of anti-PDGFR-alpha antibodies by immunological methods in patients with systemic sclerosis (SSc). METHODS:Fifty-eight women diagnosed with SSc and 36 healthy women controls were included. IgG anti-PDGFR-alpha were measured by ELISA and immunoblot. Associations with clinical and immunological findings were also studied. RESULTS:Non-significant differences were detected between patients with SSc and controls: median value 0.287 (range 0-2.06) versus median value 0.226 (range 0-2.94), respectively (p = 0.583). No correlation between the presence of anti-PDGFR-alpha antibodies and clinical and serological features was found. Serum samples from patients with SSc and healthy people who had high titres of anti-PDGFR-alpha antibodies by ELISA recognised the same band corresponding to PDGFR-alpha by immunoblot. CONCLUSION:Although anti-PDGFR-alpha antibodies seem to be disease-specific when determined by bioactivity assays, these antibodies are also detected in normal subjects when immunological methods are used. Thus, anti-PDGFR-alpha antibodies may arise from natural autoantibodies. Possibly, SSc autoantibodies recognise a different epitope on the PDGFR-alpha molecule which triggers its stimulatory effect when analysed by functional assays. Alternatively, naturally occurring autoantibodies may even become pathogenic after affinity maturation and class switching in genetically susceptible subjects.

journal_name

Ann Rheum Dis

authors

Balada E,Simeón-Aznar CP,Ordi-Ros J,Rosa-Leyva M,Selva-O'Callaghan A,Pardos-Gea J,Fonollosa-Pla V,Vilardell-Tarrés M

doi

10.1136/ard.2007.085480

subject

Has Abstract

pub_date

2008-07-01 00:00:00

pages

1027-9

issue

7

eissn

0003-4967

issn

1468-2060

pii

ard.2007.085480

journal_volume

67

pub_type

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