Chlamydia trachomatis serology in ankylosing spondylitis

Area of Science:

• Immunology
• Rheumatology
• Microbiology

Background:

• Ankylosing spondylitis (AS) is a chronic inflammatory disease.
• Chlamydia trachomatis has been implicated as a potential etiological agent in AS.
• The role of HLA-B27 positivity in the immune response to Chlamydia trachomatis requires further investigation.

Purpose of the Study:

• To investigate the prevalence of chlamydial antibodies in patients with AS and healthy individuals.
• To determine if HLA-B27 positivity is associated with an enhanced antibody response to Chlamydia trachomatis.

Main Methods:

• Serum samples were collected from four groups: HLA-B27 positive AS patients, HLA-B27 positive patients with other rheumatic diseases, HLA-B27 positive healthy blood donors, and healthy untyped blood donors.
• Chlamydial IgA and IgG antibodies were measured using an immunoperoxidase assay (IPA).
• Statistical analysis was performed to compare antibody prevalence between groups.

Main Results:

• Chlamydial IgA antibodies were significantly more prevalent in HLA-B27 positive individuals (including AS patients and healthy donors) compared to healthy controls.
• A high concordance was observed between chlamydial IgA and IgG antibodies.
• Specific IgA prevalence was significantly higher in AS patients and healthy HLA-B27 positive individuals compared to healthy controls.

Conclusions:

• The findings suggest an enhanced antibody production against Chlamydia trachomatis in HLA-B27 positive individuals, irrespective of their disease status.
• This enhanced response may indicate a predisposition or altered immune surveillance in HLA-B27 positive individuals regarding Chlamydia trachomatis infections.
• Further research is warranted to elucidate the precise etiological role of Chlamydia trachomatis in ankylosing spondylitis.