title: Anti-SGPG antibody in CIDP: nosological position of IgM anti-MAG/SGPG antibody-associated neuropathy.
abstract: Polyneuropathy with monoclonal gammopathy usually is considered a nosological entity different from chronic inflammatory demyelinating polyneuropathy (CIDP). Criteria proposed by the American Academy of Neurology AIDS Task Force (1991), however, show monoclonal gammopathy to be a condition concurrent with CIDP. The purpose of this study was to clarify the nosological relationship between CIDP and IgM anti-myelin-associated glycoprotein (MAG)/sulfated glucuronyl paragloboside (SGPG)-associated polyneuropathy. We investigated IgM anti-MAG/SGPG antibody in 85 CIDP patients by various methods, then examined the relation of M-protein to the presence of IgM anti-MAG/SGPG antibody. In our large study, 17 (20%) of 85 CIDP patients had high IgM anti-SGPG antibody titers in the enzyme-linked immunosorbent assay. This was confirmed by thin-layer chromatography-immunostaining for IgM anti-SGPG antibody and immunoblotting for IgM anti-MAG antibody. Immunoelectrophoresis and immunofixation, respectively, detected IgM M-protein in 6 (35%) and 13 (76%) of the 17 CIDP patients. We conclude that some patients with IgM anti-MAG/SGPG antibody with or without monoclonal gammopathy may be diagnosed as having CIDP, when patients are diagnosed according to the current CIDP criteria.
authors.affiliation: Department of Neurology, Dokkyo University School of Medicine, Kitakobayashi 880, Mibu, Shimotsuga, Tochigi 321-0293, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Tagawa
authors.forename: N
authors.initials: N
authors.lastname: Yuki
authors.forename: K
authors.initials: K
authors.lastname: Hirata
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001323:Autoantibodies / Q000097:blood*; D004594:Electrophysiology; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005915:Globosides / Q000276:immunology*; D006801:Humans; D007122:Immunoelectrophoresis; D007075:Immunoglobulin M / Q000097:blood; D008297:Male; D008875:Middle Aged; D018992:Myelin-Associated Glycoprotein / Q000276:immunology*; D020277:Polyradiculoneuropathy, Chronic Inflammatory Demyelinating / Q000175:diagnosis / Q000276:immunology* / Q000503:physiopathology*
chemical_list: D001323:Autoantibodies; D005915:Globosides; D007075:Immunoglobulin M; D018992:Myelin-Associated Glycoprotein; C051917:sulfate-3-glucuronyl paragloboside