A few reports has been appeared concerning on a human circulating B cells; the lymphocytes on which surfaces bound immunoglobulins. These reports covered mainly a special diseasers such as chronic lymphocytic leukemia, acute lymphocytic leukemia, Hodgkin's disease and congenital immunodeficiency syndromes. The percentages of B cell in circulating lymphocytes of the parients with autoimmune diseases and some hematological disorders were examined in this paper. The Conray 400-Ficoll technique was used for separation of circulating lymphocytes. This lymphocytes had 98% purity and 100% viability. Using the membrane immunofluorescent technique, surface immunoglobulin bearing cell (SIBC) was determined by the Nikon fluoromicroscope. SIBC were able to classify into three types; caping form, and faint form, according to their staining patterns. Caping and ring form staining were considered to be specific for SIBC, and calcuated their percentages against the circulating lymphocytes. In normal subjects the percentage of SIBC (IgG, A, M) was 20.7%, SIBC (IgG) 18.8% and SIBC (IgM) 9.3%. Increased SIBC (IgG, A, M) was observed in the patients with polymyositis and chronic lymphocytic leukemia and decreased in the patients with myasthenia gravis. SIBC (IgM) did not show remarkable changes in these diseases examined. After thymectomy, SIBC (IgG, A, M and IgG) increased significantly than before thymectomy in the parients with myasthenia gravis, having no remarkable changes in SIBC (IgM).
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