Antecedent infections in Fisher syndrome: a common pathogenesis of molecular mimicry.
Autor(es): Koga M,Gilbert M,Li J,Koike S,Takahashi M,Furukawa K,Hirata K,Yuki N
Resumo: To assess the production mechanism of anti-GQ1b autoantibody in Fisher syndrome (FS). The authors conducted a prospective case-control serologic study of five antecedent infections (Campylobacter jejuni, cytomegalovirus, Epstein-Barr virus, Mycoplasma pneumoniae, and Haemophilus influenzae) in 73 patients with FS and 73 sex- and age-matched hospital controls (HCs). Serologic evidence in FS patients of C. jejuni (21%) and H. influenzae (8%) infections was present significantly more often than in the HCs. None of the five pathogens examined was found in the 49 (67%) patients with FS. Anti-GQ1b IgG antibody was detected in most FS patients infected with C. jejuni or H. influenzae. Mass spectrometry analysis identified a C. jejuni strain (CF93-6) carrying a GT1a-like lipo-oligosaccharide (LOS) that had been isolated from an FS patient. Immunization of complex ganglioside-lacking knockout mice with the GT1a-like LOS generated IgG class monoclonal antibodies (mAbs) that reacted with GQ1b and GT1a. Thin-layer chromatography with immunostaining showed that anti-GQ1b mAb bound to the C. jejuni LOS (50% of the 20 FS-related strains) more commonly than in the Guillain-Barré syndrome (GBS)-related (7% of 70) or enteritis-related (20% of 65) strains. Anti-GM1 and anti-GD1a mAbs also reacted with the LOS from some FS-related strains (both 20%), but binding frequencies were higher in the GBS-related strains (74 and 57%). The GQ1b epitope was detected in 4 (40%) of the 10 FS-related H. influenzae strains but was absent in strains from patients with GBS (n = 4) and uncomplicated respiratory infections (n = 10). C. jejuni and H. influenzae are related to Fisher syndrome (FS) development, and production of anti-GQ1b autoantibody is mediated by the GQ1b-mimicking lipo-oligosaccharides on those bacteria. The causative agents remain unclear in the majority of patients with FS.
Imprenta: Neurology, v. 64, n. 9, p. 1605-1611, 2005
Identificador do objeto digital: 10.1212/01.WNL.0000160399.08456.7C
Descritores: Guillain-Barre Syndrome - Pathogenesis ; Guillain-Barre Syndrome - Proteins ; Guillain-Barre Syndrome - Antibodies ; Guillain-Barre Syndrome - Viral infections ; Guillain-Barre Syndrome - Molecular methods ; Guillain-Barre Syndrome - virus ; Guillain-Barre Syndrome - Immunology ; Guillain-Barre Syndrome - Public health
Data de publicação: 2005
