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?2C and D); however, both IgG and IgM antibodies from sera of SLE patients positive for anti-EPOR antibodies dose-dependently inhibited EPO-mediated growth of AS-E2 cells, but had no effect on SCF-mediated growth (Fig.?2E and F). The extent of anaemia and the number of reticulocytes were compared between patients with and without anti-EPOR antibodies. CKD patients receiving erythropoiesis-stimulating agents (ESA) were excluded from the analysis. The haemoglobin level and the number of reticulocytes were lower in patients with than in those without anti-EPOR antibodies (Fig.?3A and B). In addition, there was a negative correlation between optical density of anti-EPOR antibodies by ELISA and the number of reticulocytes (P? http://www.selleckchem.com/products/loxo-101.html (Fig.?3C). Twenty-seven patients with anaemia in whom bone marrow aspiration was performed were examined to evaluate the status of the bone marrow http://www.selleck.cn/products/ON-01910.html erythroid series. As before, CKD patients treated with ESA were excluded from the analysis. The Mann�CWhitney U test indicated that the proportion of bone marrow erythroblasts was lower in patients with than in those without anti-EPOR antibodies (Fig.?4A). In addition, the number of erythroblasts was decreased in patients with anti-EPOR antibodies (Fig.?4B), and the number of erythroblasts was inversely correlated to the optical density of anti-EPOR antibodies measured by ELISA (Fig.?4C). Demographic and clinical findings as well as coexisting autoantibodies were compared between SLE http://www.selleckchem.com/products/abc294640.html patients with and without anti-EPOR antibodies; selected findings are shown in Table?1. The Hb level and the number of reticulocytes were lower in patients with than in those without anti-EPOR antibodies. However, the SLEDAI score was the same for both groups, indicating that the presence of anti-EPOR antibodies was not associated with disease activity. With respect to other autoantibodies, anti-U1 RNP was more frequent in patients with than in those without anti-EPOR antibodies. Table?2 shows Hb concentrations, number of reticulocytes, and serum anti-EPOR antibody levels over time in two SLE patients with anaemia. Both patients were newly diagnosed with SLE and had haematological manifestations at the time of their first admission to our hospital. Bone marrow examination in Patient 2 revealed erythroid hypoplasia. Before-treatment sera from each patient were anti-EPOR antibody-positive when first tested, but after corticosteroid therapy, the Hb and reticulocyte levels increased and the serum became negative for anti-EPOR antibodies. The clinical courses of these patients further supported the association between impaired erythropoiesis and anti-EPOR antibodies. This is the first report to document the presence of EPOR autoantibodies in pathological states of anaemia with erythroid hypoplasia.