Home >> Redox Report, Volume 16, Number 6

Autoimmune reactivity of IgM acquired after oxidation

Authors: Omersel, Jasna1; Avberšek-Lužnik, Ivica2; Grabnar, Pegi Ahlin3; Kveder, Tanja4; Rozman, Blaž4; Božič, Borut1

Source: Redox Report, Volume 16, Number 6, November 2011 , pp. 248-256(9)

Publisher: Maney Publishing

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Abstract:

Objectives

Redox-reactive antibodies, mainly of the IgG class, gained a wide area of interest after their autoimmune reactivity was revealed following the application of chemical and physiological oxidants. In this study, we examined the susceptibility of IgMs to oxidation and evaluated their binding to the autoantigens important in some autoimmune diseases.

Methods

IgM and IgG fractions, isolated from healthy individuals’ sera, were oxidized using direct electric current or physiological oxidant hemin. Specificities towards beta-2-glycoprotein I (?2-GPI), cardiolipin (CL), and rheumatoid factor were evaluated with the enzyme-linked immunosorbent assays (ELISAs). Post-translational modification was investigated by 2,4-dinitrophenylhydrazine reaction.

Results

Electrochemically oxidized IgM fractions exhibited altered immunoreactivity ? low to medium titers in anti-CL and low positive titers in anti-?2-GPI ELISA but exhibited no rheumatoid factor reactivity. Oxidized IgG and IgM fractions exhibited 2.5- and 5-fold increase in the carbonyl content, respectively.

Discussion

An increase in the carbonyl content along with increased immunoreactivity after oxidation suggests modifications of the IgM paratopes. These results point towards possible modifications of native IgMs to their autoimmune state despite the fact that IgMs were less susceptible to oxidation than IgGs. The importance of an individual's redox status in maintenance of autoimmune reactions was emphasized by in vitro diagnostic tests.

Keywords: Redox-reactive antibodies; Natural autoantibodies; Oxidation; Autoimmune disease; Protein carbonylation

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174329211X13190184351680

Affiliations: 1: Chair of Clinical Biochemistry, Faculty of Pharmacy, University in Ljubljana, Ljubljana, Slovenia 2: General Hospital Jesenice, Unit for Laboratory Diagnostics, Jesenice, Slovenia 3: Chair of Pharmaceutical Technology, Faculty of Pharmacy, University in Ljubljana, Ljubljana, Slovenia 4: Department of Rheumatology, Division of Internal Medicine, University Medical Centre, Ljubljana, Slovenia

Publication date: 2011-11-01

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