Frequency of serological markers of rheumatoid arthritis in patients with IgA anti‐β2 glycoprotein I antibodies

• Published in: Journal of clinical laboratory analysis Vol. 36; no. 7; pp. e24537 - n/a
• Main Authors: Melayah, Sarra, Ghozzi, Mariem, Mankaï, Amani, Mechi, Fatma, Ghedira, Ibtissem
• Format: Journal Article
• Language: English
• Published: United States John Wiley & Sons, Inc 01.07.2022; John Wiley and Sons Inc
• Subjects: Antibodies; antiphospholipid syndrome; anti‐cyclic citrullinated peptides antibodies; anti‐β2 glycoprotein I antibodies; Autoimmune diseases; Blood donors; Citrulline; Disease; Enzyme-linked immunosorbent assay; Females; Glycoprotein I; Glycoproteins; Hepatitis; Immunoglobulin A; Immunoglobulin G; Immunoglobulin M; Isotypes; Lupus; Males; Peptides; Pregnancy; Rheumatoid arthritis; rheumatoid factors; Serology; Thrombosis; Tumor necrosis factor-TNF; Germany; antiphospholipid syndrome; rheumatoid factors; anti-cyclic citrullinated peptides antibodies; rheumatoid arthritis; anti-β2 glycoprotein I antibodies
• ISSN: 0887-8013; 1098-2825
• DOI: 10.1002/jcla.24537

Aim To determine the frequency of serological markers of RA in patients with anti‐β2 glycoprotein I antibodies (aβ2GPI) of IgA isotype. Material and Methods A retrospective study was conducted on 67 patients with aβ2GPI‐IgA. Ninety healthy blood donors (HBD) were used as a control group. IgG anti‐cyclic citrullinated peptides antibodies (CCP‐Ab) and rheumatoid factors (RF) IgG, IgA, and IgM were detected by enzyme‐linked immunosorbent assay (ELISA). Results Seventeen patients and eight HBD had CCP‐Ab and/or RF (25.4% vs. 8.9%, p = 0.005, CI 95% [14.95; 35.79], odds ratio = 3.5). The frequency of CCP‐Ab was significantly higher in patients than in healthy subjects (14.9% vs. 3.3%, p = 0.009). IgA isotype of RF was significantly higher in patients than in controls (7.5% vs. 0%, p = 0.02). In male patients, CCP‐Ab and/or RF were more frequent than in healthy male subjects (37.5% vs. 11.8%, p = 0.02). In patients, no correlation was found between the levels of aβ2GPI‐IgA and CCP‐Ab (r = 0.082, p = 0.51). There was no correlation between the level aβ2GPI‐IgA and the level of the isotypes of RF (IgG, IgA, and IgM) in patients (r = 0.1, p = 0.37; r = 0.17, p = 0.17 and r = 0.07, p = 0.59 respectively). Conclusion Frequencies of CCP‐Ab and RF are high in patients with aβ2GPI‐IgA suggesting that these patients are susceptible to developing RA. Frequency of CCP‐Ab and RF in patients with IgA anti‐β2 glycoprotein I antibodies.