Ted R Mikuls1,2, Michael J Duryee1,2, Rafid Rahman2, Daniel R Anderson2, Harlan R Sayles3, Andrew Hollins2, Kaleb Michaud2,4, Frederick Wolfe4, Geoffrey E Thiele2, Jeremy Sokolove5, William H Robinson6, Nithya Lingampalli6, Anthony P Nicholas7, Geoffrey A Talmon8, Kaihong Su8, Matthew C Zimmerman9, Lynell W Klassen1,2, Geoffrey M Thiele1,2. 1. Veteran Affairs Nebraska-Western Iowa Health Care System. 2. Department of Internal Medicine, Division of Cardiovascular Medicine. 3. College of Public Health, Department of Biostatistics, University of Nebraska Medical Center, Omaha, NE. 4. National Data Bank for Rheumatic Diseases, Wichita, KS. 5. VA Palo Alto Healthcare Center and Division of Immunology and Rheumatology, Stanford University School of Medicine, Palo Alto. 6. VA Palo Alto Healthcare System and Department of Medicine, Division of Rheumatology, Stanford University, Stanford, CA. 7. Department of Neurology, University of Alabama at Birmingham, Birmingham, AL. 8. Department of Pathology and Microbiology. 9. Department of Cellular & Integrative Physiology, University of Nebraska Medical Center, Omaha, NE, USA.
Abstract
Objective: To characterize the expression of malondialdehdye-acetaldehyde (MAA) adducts and anti-MAA antibody in articular tissues and serum of patients with RA. Methods: Paired sera and SF were examined from 29 RA and 13 OA patients. Anti-MAA antibody, RF, ACPA and total immunoglobulin were quantified. SF-serum measures were compared within and between disease groups. The presence and co-localization of MAA, citrulline and select leukocyte antigens in RA and OA synovial tissues were examined using immunohistochemistry. Results: Circulating and SF anti-MAA antibody concentrations were higher in RA vs OA by 1.5- to 5-fold. IgG (P < 0.001), IgM (P = 0.006) and IgA (P = 0.036) anti-MAA antibodies were higher in paired RA SF than serum, differences not observed for total immunoglobulin, RF or ACPA. In RA synovial tissues, co-localization of MAA with citrulline and CD19+ or CD27+ B cells was demonstrated and was much higher in magnitude than MAA or citrulline co-localization with T cells, monocytes, macrophages or dendritic cells (P < 0.01). Conclusion: Anti-MAA antibodies are present in higher concentrations in the RA joint compared with sera, a finding not observed for other disease-related autoantibodies. Co-localization of MAA and citrulline with mature B cells, coupled with the local enrichment of anti-MAA immune responses, implicates MAA-adduct formation in local autoantibody production.
Objective: To characterize the expression of malondialdehdye-acetaldehyde (MAA) adducts and anti-MAA antibody in articular tissues and serum of patients with RA. Methods: Paired sera and SF were examined from 29 RA and 13 OA patients. Anti-MAA antibody, RF, ACPA and total immunoglobulin were quantified. SF-serum measures were compared within and between disease groups. The presence and co-localization of MAA, citrulline and select leukocyte antigens in RA and OA synovial tissues were examined using immunohistochemistry. Results: Circulating and SF anti-MAA antibody concentrations were higher in RA vs OA by 1.5- to 5-fold. IgG (P < 0.001), IgM (P = 0.006) and IgA (P = 0.036) anti-MAA antibodies were higher in paired RA SF than serum, differences not observed for total immunoglobulin, RF or ACPA. In RA synovial tissues, co-localization of MAA with citrulline and CD19+ or CD27+ B cells was demonstrated and was much higher in magnitude than MAA or citrulline co-localization with T cells, monocytes, macrophages or dendritic cells (P < 0.01). Conclusion: Anti-MAA antibodies are present in higher concentrations in the RA joint compared with sera, a finding not observed for other disease-related autoantibodies. Co-localization of MAA and citrulline with mature B cells, coupled with the local enrichment of anti-MAA immune responses, implicates MAA-adduct formation in local autoantibody production.
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