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J Biomed Sci. 2019 Sep 6;26(1):67. doi: 10.1186/s12929-019-0562-5.

Most of anti-glycolipid IgG-antibodies associated to neurological disorders occur without their IgM counterpart.

Author information

1
Facultad de Ciencias Químicas. Departamento de Química Biológica Ranwel Caputto, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina. rlardone@fcq.unc.edu.ar.
2
Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), CONICET. Universidad Nacional de Córdoba, Córdoba, Argentina. rlardone@fcq.unc.edu.ar.
3
Facultad de Ciencias Químicas. Departamento de Química Biológica Ranwel Caputto, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina.
4
Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), CONICET. Universidad Nacional de Córdoba, Córdoba, Argentina.

Abstract

BACKGROUND:

Different neurological disorders frequently display antibodies against several self-glycans. Increasing evidence supports their pathogenic role; however, far less is known about their origin. Meanwhile, antibodies recognizing non-self glycans appear in normal human serum during immune response to bacteria.

METHODS:

Using high performance thin layer chromatography-immunostaining, we comparatively evaluated humoral immune response (IgG and IgM immunoreactivity) against glycolipids carrying self-glycans (GM3/GM2/GM1/GD1a/GD1b/GD3/GT1b/GQ1b) and non-self glycans (Forssman/GA1/"A" blood group/Nt7) in sera from 383 patients with neurological disorders along with 87 healthy controls.

RESULTS:

In contrast to no healthy controls having anti-self glycan IgG antibodies, one-fifth of patients' sera had anti-self glycan IgG antibodies: remarkably, 60% of these occurred without IgM antibodies of the same specificity. Contrary to this unusual fact (anti-self glycan IgG occurrence without simultaneous presence of IgM having the same specificity ~ IgG/IgM discordance), all IgG antibodies against non-self glycans occurred simultaneously with their IgM antibody counterpart (i.e. 0% discordance). When analyzed closer, the IgG/IgM discordance frequency for anti-self glycans exhibited a dual trend: below 40% for IgG antibodies against GM2, GM1 and GD1b, and greater than 53% for IgG antibodies against the remaining self glycans. Interestingly, this discordance behavior was common to several different neurological disorders.

CONCLUSIONS:

Classic immunology principles indicate this anti-self glycan IgG/IgM discordance should not occur in an antibody response; its unusual presence is discussed within the "binding site drift hypothesis" context, where anti-self glycan IgG antibodies could originate from pre-existing IgG recognizing structurally-related non-self glycans.

KEYWORDS:

Anti-ganglioside IgG-antibodies; Autoimmunity; Glycan; Glycolipid; IgG/IgM discordance; Neurological disorder

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