title: Chronic lymphocytic leukemia B-lymphocytes forming SRBC-rosettes not due to an anti-SRBC activity of monoclonal surface immunoglobulin.
abstract: A case of chronic lymphocytic leukemia is described in which large numbers of peripheral blood lymphocytes expressed immunoglobulin on their membrane and rosetted spontaneously with sheep red blood cells (SRBC) at 4 degrees C. They also showed weak staining with a heterologous antiserum against T-cells as well as with a monoclonal antibody (OKT11) with specificity for an epitope associated with the SRBC-receptor, but failed to react with other T-lineage-restricted monoclonal antibodies. The B-cell origin of the leukemic cells was documented by the presence of light-chain-restricted monoclonal surface immunoglobulin, reactivity with various monoclonal anti-B-cell reagents, presence of Ia-like antigens, their capability to synthesize intracytoplasmic immunoglobulin on exposure to phorbol ester TPA, their lack of response to T-cell mitogen PHA, and their inability to help or suppress the allogeneic B-cell response upon PWM stimulation. Extensive blocking studies with both specific antisera and Forsmann antigen-rich guinea pig kidney extracts, which did not prevent SRBC-rosetting, lend support to the hypothesis that SRBC-rosette formation in this case was not attributable to an anti-SRBC affinity of the surface immunoglobulin on the cells. This case will be discussed in relation to the recent finding of SRBC-rosette expression on some cultured chronic lymphocytic leukemia B-lymphocytes.
mesh_terms: D000368:Aged; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D001402:B-Lymphocytes / Q000145:classification / Q000187:drug effects / Q000276:immunology*; D002462:Cell Membrane / Q000276:immunology; D004912:Erythrocytes / Q000276:immunology; D006801:Humans; D007945:Leukemia, Lymphoid / Q000276:immunology*; D008213:Lymphocyte Activation; D008297:Male; D008934:Mitogens / Q000494:pharmacology; D010641:Phenotype; D011947:Receptors, Antigen, B-Cell / Q000032:analysis*; D011971:Receptors, Immunologic / Q000032:analysis*; D012397:Rosette Formation; D012756:Sheep; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D000911:Antibodies, Monoclonal; D008934:Mitogens; D011947:Receptors, Antigen, B-Cell; D011971:Receptors, Immunologic; D013755:Tetradecanoylphorbol Acetate