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. 1986 Aug 1;164(2):627–641. doi: 10.1084/jem.164.2.627

Transgenic mice with mu and kappa genes encoding antiphosphorylcholine antibodies

PMCID: PMC2188231  PMID: 2425036

Abstract

Transgenic mice were produced that carried in their germlines rearranged kappa and/or mu genes with V kappa and VH regions from the myeloma MOPC-167 kappa and H genes, which encode anti-PC antibody. The mu genes contain either a complete gene, including the membrane terminus (mu genes), or genes in which this terminus is deleted and only the secreted terminus remains (mu delta mem genes). The mu gene without membrane terminus is expressed at as high a level as the mu gene with the complete 3' end, suggesting that this terminus is not required for chromatin activation of the mu locus or for stability of the mRNA. The transgenes are expressed only in lymphoid organs. In contrast to our previous studies with MOPC-21 kappa transgenic mice, the mu transgene is transcribed in T lymphocytes as well as B lymphocytes. Thymocytes from mu and kappa mu transgenic mice display elevated levels of M-167 mu RNA and do not show elevated levels of kappa RNA, even though higher than normal levels of M-167 kappa RNA are detected in the spleen of these mice. Approximately 60% of thymocytes of mu transgenic mice produce cytoplasmic mu protein. However, despite a large amount of mu RNA of the membrane form, mu protein cannot be detected on the surface of T cells, perhaps because it cannot associate with T cell receptor alpha or beta chains. Mice with the complete mu transgene produce not only the mu transgenic mRNA but also considerably increased amounts of kappa RNA encoded by endogenous MOPC-167 like kappa genes. This suggests that B cells are selected by antigen (PC) if they coexpress the mu transgene and appropriate anti-PC endogenous kappa genes. Mice with the mu delta mem gene, however, do not express detectable levels of the endogenous MOPC-167 kappa mRNA. Like the complete mu transgene, the M-167 kappa transgene also causes amplification of endogenous MOPC-167 related immunoglobulins; mice with the kappa transgene have increased amounts of endogenous MOPC-167-like mu or alpha or gamma in the spleen, all of the secreted form. Implications for the regulation of immunoglobulin gene expression and B cell triggering are discussed.

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Selected References

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