Aberrant levels of natural IgM antibodies in osteoarthritis and rheumatoid arthritis patients in comparison to healthy controls

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• 作者：Tue G. Nguyen^a ; ^b ; ^{tommie.nguyen@sydney.edu.au" class="auth_mail" title="E-mail the corresponding author} ; ^{tgnguyen@med.usyd.edu.au" class="auth_mail" title="E-mail the corresponding author} ; Kelly J. McKelvey^b ; ^c ; Lyn M. March^d ; ^e ; David J. Hunter^d ; ^e ; Meilang Xue^c ; ^d ; Christopher J. Jackson^c ; ^d ; Jonathan M. Morris^b ; ^f
• 关键词：BSA ; bovine serum albumin ; CRP ; C-reactive protein ; CVD ; cardiovascular disease ; DAMPS ; danger-associated molecular patterns ; dsDNA ; double-stranded DNA ; ELISA ; enzyme-linked immunoassay ; Gal ; galactosyl ; IQR ; interquartile range ; LOX-1 ; lectin-like oxidized low-density lipoprotein receptor-1 ; MCP-1 ; monocyte chemoattractant protein 1 ; MMP-13 ; matrix metallopeptidase-13 ; nIgM ; natural IgM ; OA ; osteoarthritis ; OD ; optical density ; oxLDL ; oxidized low-density lipoprotein ; PAMPs ; pathogen-associate
• 刊名：Immunology Letters
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：170
• 期：Complete
• 页码：27-36
• 全文大小：2699 K

文摘

Natural IgM antibodies (nIgM) are polyreactive autoantibodies that have diverse roles in regulating autoimmunity, systemic inflammation and removal of oxidized low-density lipoproteins (oxLDL). We hypothesized that aberrant states of nIgM may exist in persons with osteoarthritis (OA) and rheumatoid arthritis (RA). Herein, we characterized and compared the levels of nIgM specific for phosphorylcholine (anti-PC), double-stranded DNA (anti-dsDNA), and galactosyl (anti-Gal) in persons with OA, RA and healthy controls (HC). Levels of anti-PC nIgM in OA patients were significantly lower than both HC and RA patients in an age-adjusted analysis (P < 0.05). In contrast, anti-Gal nIgM levels were significantly higher in RA patients than OA patients (P < 0.05) and markedly increased in comparison to HC. Anti-PC nIgM significantly correlated with anti-dsDNA and anti-Gal nIgM levels in HC and RA (P < 0.05) but not in OA patients. Elevated CRP levels were associated with RA conditions and old ages in general. There was no significant correlation between anti-PC nIgM and CRP or oxLDL levels. Our study highlights for the first time the evidence of aberrant state of nIgM in human OA compared to healthy individuals that implicates a deficiency in immune responses to oxLDL which may contribute to the metabolic syndromes in the development of OA.