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Kline GH, Hartwell L, Beck-Engeser GB, Keyna U, Zaharevitz S, Klinman NR, Jäck HM. Pre-B Cell Receptor-Mediated Selection of Pre-B Cells Synthesizing Functional μ Heavy Chains. THE JOURNAL OF IMMUNOLOGY 1998. [DOI: 10.4049/jimmunol.161.4.1608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Ig gene rearrangements could generate VH-D-JH joining sequences that interfere with the correct folding of a μ-chain, and thus, its capability to pair with IgL chains. Surrogate light (SL) chain might be the ideal molecule to test the capacity of a μ-chain to pair with a L chain early in development, in that only pre-B cells that assemble a membrane μ-SL complex would be permitted to expand and further differentiate. We have previously identified two SL chain nonpairing VH81X-μ-chains with distinct VH-D-JH joining regions. Here, we show that one of these VH81X-μ-chains does not rescue B cell development in JH knock-out mice, because flow cytometric analysis of bone marrow cells from VH81X-μ transgenic JH knock-out mice revealed normal numbers of pro-B cells, but essentially no pre-B and surface IgM+ B cells. Immunoprecipitation analysis of transfected pre-B and hybridoma lines revealed that the same μ-chain fails to pair not only with SL chain but also with four distinct κ L chains. These findings demonstrate that early pre-B cells are selected for maturation on the basis of the structure of a μ-chain, in particular its VH-D-JH joining or CDR3 sequence, and that one mechanism for this selection is the capacity of a μ-chain to assemble with SL chain. Therefore, we propose a new function of SL chain in early B cell development: SL chain is part of a quality control mechanism that tests a μ-chain for its ability to pair with conventional L chains.
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Affiliation(s)
- Gregory H. Kline
- *Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037; and
| | - Laura Hartwell
- †Department of Microbiology and Immunology, and Program in Molecular Biology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL 60153
| | - Gabrielle B. Beck-Engeser
- †Department of Microbiology and Immunology, and Program in Molecular Biology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL 60153
| | - Ulrike Keyna
- †Department of Microbiology and Immunology, and Program in Molecular Biology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL 60153
| | - Samantha Zaharevitz
- *Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037; and
| | - Norman R. Klinman
- *Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037; and
| | - Hans-Martin Jäck
- †Department of Microbiology and Immunology, and Program in Molecular Biology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL 60153
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