Selective partial IgM deficiency: Functional assessment of T and B lymphocytesin vitro |
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Authors: | Takatoshi Inoue Yuzo Okumura Masafumi Shirahama Hiromi Ishibashi Seizaburo Kashiwagi Hideo Okubo |
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Affiliation: | (1) The First Department of Medicine, Faculty of Medicine, Kyushu University, 812 Fukuoka, Japan;(2) Present address: Kokura Municipal Hospital, 2-1-1, Bashaku-Cho, Kokura-Kitaku, 802 Kitakyushu, Japan |
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Abstract: | Seven patients with selective IgM deficiency (SIgMD) were studied for cell surface immunoglobulin (SmIg), T-cell subpopulations, and immunoglobulin (Ig) synthesisin vitro by peripheral blood lymphocytes (PBL). Serum IgM levels were less than 25 mg/dl, while IgA, IgG, and IgD were within normal levels. The patients had respiratory or urinary tract infections and two were diagnosed as having systemic lupus erythematosus (SLE). T/B-cell ratios in PBL were within normal ranges. Percentage ratios of B cells bearing SmIg were normal in five patients and decreased in two; however, normal values were seen after 7 days of culture in the presence of PWM. OKT4/OKT8 ratios decreased in five of seven patients, in whom two were due to a decrease in OKT4 and two to an increase in OKT8 cells. One showed a decrease in OKT4 and an increase in OKT8. Analysis of lymphocyte function for Ig synthesisin vitro, using a coculture of counterpart T and B cells from healthy individuals and patients with SIgMD, revealed that the increased function of IgM isospecific suppressor T cells (Ts) was responsible for the IgM deficiency in all seven patients. |
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Keywords: | IgM deficiency primary immune deficiency lymphocyte subsets |
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