Fig 1: Frequency of DM and Immunofluorescence Stainings on Pancreatic Tissue(A) Frequency of diabetes mellitus is significantly elevated in patients seropositive for antiparanodal antibodies (33.3%) compared with seronegative patients (14.1%, p = 0.014) and with the general German population (9.9%, p < 0.001), especially in anti–contactin-1-seropositive patients (58.3% vs 14.1% in seronegative, p < 0.001 and 9.9% in the German population, p < 0.001). Significance levels are marked with asterisks: *p < 0.05, **p < 0.01, ***p < 0.001. (B) In seropositive patients not having received corticosteroid treatment within the last 28 days and who were therapy naive to rituximab, HbA1c levels (y-axis, %) were determined in 14 patients at the time point of serum withdrawal and correlated significantly with the autoantibody titer, displayed on a logarithmic scale (r = 0.58, p = 0.029). (C.a–l) Photomicrographs show human pancreatic normal tissue sections with nucleus staining (DAPI) shown in blue (C.a, C.d, C.g, and C.j) and double staining with synaptophysin as marker for the islets of Langerhans (displayed in green, C.b, C.e, C.h, and C.k) and serum or antiparanodal antibodies (displayed in magenta, C.c, C.f, C.i, and C.l). Serum of a patient with CIDP and DM type 1 with GAD antibodies binds to β cells in pancreatic islets of Langerhans (C.a–c), whereas serum of a patient with anti–contactin-1 antibodies (C.d–f) and commercial goat anti–contactin-1 (C.g–i) and commercial chicken anti–pan-neurofascin (C.j–l) do not show any binding. Photomicrographs of binding of the other patients' sera or commercial antibodies tested in the assay are not shown. Scale bar = 10 μm. CNTN = contactin-1; DAPI = 4′,6-diamidino-2-phenylindole; DM = diabetes mellitus; HbA1c = hemoglobin A1C.
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