title: Light-chain diversification during pre-B cell differentiation.
abstract: The possibility that a committed normal pre-B cell can generate progeny expressing more than one light chain was studied by isoelectric focusing of supernatants from pre-B cells cultured at limiting dilution. Supernatants from mitogen-stimulated mature spleen B-cells analysed on day 6 have shown the presence of a rather homogeneous IgM spectrotype profile. Supernatants from the 8-10-day cultures were usually negative. Isoelectric focusing profiles of supernatants from cultures of bone marrow pre-B cells were different from those of mature spleen cells. Many IgM spectrotypes appeared in the culture supernatants of bone marrow pre-B cells between days 6 and 13, whether the cultures were negative or restricted in their IgM profiles on day 6. These results support the idea that normal pre-B cells, during differentiation, can associate a variety of light chains with an already chosen mu heavy chain.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology*; D001853:Bone Marrow / Q000276:immunology; D001854:Bone Marrow Cells; D002454:Cell Differentiation; D002478:Cells, Cultured; D005260:Female; D007147:Immunoglobulin Light Chains / Q000032:analysis*; D007075:Immunoglobulin M / Q000032:analysis*; D007525:Isoelectric Focusing; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D007147:Immunoglobulin Light Chains; D007075:Immunoglobulin M