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Pre-pre-B cells containing only cytoplasmic B220 can be induced by dendritic cells and T cells to differentiate in
F Saleh1, D M Spalding, J A Griffin
1Department of Microbiology, Birmingham Veterans Administration Hospital, Alabama.
We have derived from spleens of nude mice early B lineage cells that were phenotypically compatible with a pre-pre-B cell stage of differentiation. Although these cells containing large basophilic granules had the B lymphocyte antigen B220, in the cytoplasm, they had no surface B220, no cytoplasmic or surface immunoglobulin heavy or light chains, no surface Thy-1, and no surface Ia. In addition, they appeared to have little or no heavy chain gene rearrangements, including the D to J that occurs on both chromosomes prior to the VH rearrangement that forms the code for the C mu heavy chain polypeptide. Cells at even this early stage of differentiation could be induced by DC-T to express B220 on the surface and to synthesize and then to secrete immunoglobulins. These phenotypic changes were associated with a morphologic change in the cells to a lymphoblastoid appearance. Different patterns of immunoglobulin secretion resulted when pre-pre-B cells were cocultivated with DC-T from different tissues; SP DC-T induced the secretion of only IgM, PP DC-T induced the secretion of IgM as well as IgG and IgA. The early inductive event(s) appeared to occur during cell-cell contact in aggregates of the inducing DC-T and the pre-pre-B cells.
We have derived from spleens of nude mice early B lineage cells that were phenotypically compatible with a pre-pre-B cell stage of differentiation. Although these cells containing large basophilic granules had the B lymphocyte antigen B220, in the cytoplasm, they had no surface B220, no cytoplasmic or surface immunoglobulin heavy or light chains, no surface Thy-1, and no surface Ia. In addition, they appeared to have little or no heavy chain gene rearrangements, including the D to J that occurs on both chromosomes prior to the VH rearrangement that forms the code for the C mu heavy chain polypeptide. Cells at even this early stage of differentiation could be induced by DC-T to express B220 on the surface and to synthesize and then to secrete immunoglobulins. These phenotypic changes were associated with a morphologic change in the cells to a lymphoblastoid appearance. Different patterns of immunoglobulin secretion resulted when pre-pre-B cells were cocultivated with DC-T from different tissues; SP DC-T induced the secretion of only IgM, PP DC-T induced the secretion of IgM as well as IgG and IgA. The early inductive event(s) appeared to occur during cell-cell contact in aggregates of the inducing DC-T and the pre-pre-B cells.