Restricted expression of immunoglobulin by a long-term B lymphoid cell line derived from a patient with X-linked agammaglobulinemia is reproted. The patient had peripheral blood B lymphocytes with surface IgD and IgM. Culture of the B cells in vitro with mitogens did not stimulate immunoglobulin secretion, although pokeweed mitogen stimulation resulted in the development of cytoplasmic IgD and IgM. The lymphoid cell line established from these B lymphocytes primarily bore surface IgD, with a small population of cells also bearing surface IgM. These cells also had cytoplasmic immunoglobulin, primarily IgD. The cell line did not have a cytoplasmic pool of immunoglobulin for export and did not secrete immunoglobulin. This B lymphoid cell line is an in vitro analogue of the arrest in differentiation of the patient's B lymphocytes. The IgD-bearing phenotype may represent a normal transitional stage in the differentiation of B lymphocytes.
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| http://dx.doi.org/10.1073/pnas.75.5.2421 | DOI Listing |
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