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Rheumatology Advance Access originally published online on May 19, 2009
Rheumatology 2009 48(7):748-754; doi:10.1093/rheumatology/kep113
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© The Author 2009. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The 30-kDa band from Salmonella typhimurium: IgM, IgA and IgG antibody response in patients with ankylosing spondylitis

Jose F. Zambrano-Zaragoza1, Ma de Jesus Durán-Avelar1, Angelica N. Rodríguez-Ocampo1, Ethel García-Latorre2, Ruben Burgos-Vargas3, Maria-L. Dominguez-Lopez3, Salvador Pena-Virgen4 and Norberto Vibanco-Pérez1

1Unidad Académica de Ciencias Químico Biológicas y Farmacéuticas, Universidad Autónoma de Nayarit,2Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional,3Servicio de Reumatología, Hospital General de México and 4Clinica de Reumatologia, Departamento de Medicina Interna, HGZ No. 1 Instituto Mexicano del Seguro Social, Tepic, Nayarit, Mexico.

Correspondence to: Jose F. Zambrano-Zaragoza, Laboratorio de Inmunología, Unidad Académica de Ciencias Químico Biológicas y Farmacéuticas, Universidad Autónoma de Nayarit, Cd de la Cultura Amado Nervo s/n, CP 63190, Tepic, Nayarit, México. E-mail: jzambran{at}nayar.uan.mx; jzambran44{at}gmail.com


  Abstract

Objective. To determine the association of Salmonella typhimurium antigens with AS by analysing the IgA, IgG and IgM antibody response to the crude lysate and the 30-kDa band from this micro-organism.

Methods. Sera from 28 AS patients, 28 HLA-B27+ healthy relatives, 28 unrelated healthy subjects and 14 RA patients were included. Salmonella typhimurium proteins were electrophoretically separated and blotted onto nitrocellulose sheets for immunodetection with sera from AS patients and unrelated healthy subjects. The electroeluted 30-kDa band (p30) and a crude lysat (StCL) from S. typhimurium were used as antigen to evaluate the IgM, IgA and IgG (total and subclasses) antibody levels by ELISA. An inhibition assay was carried out to confirm the specificity of IgG response to the p30.

Results. Twenty out of 28 AS patients (71.4%) and 4 out of 28 unrelated healthy subjects (14.3%) recognized a 30-kDa band from S. typhimurium with IgG antibodies. Six out of 28 AS patients (21.4%) and 4 out of 28 unrelated healthy subjects (14.3%) detected it with IgA antibodies. Recognition of p30 and StCL by both IgA and IgG antibodies was higher in AS patients than in control groups (P = 0.003, <0.001 and 0.003 for IgA and <0.001, 0.003 and 0.006 for IgG). Sera from AS patients have higher percentage of IgG antibodies p30 and IgG3 subclass was higher in AS patients than in control groups. No differences in the IgM response were found.

Conclusions. Data presented suggest the association between the p30 and AS.

KEY WORDS: Ankylosing spondylitis, Salmonella typhimurium, Antibody levels, Autoimmunity

Submitted 18 August 2008; revised version accepted 3 April 2009.
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