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• W2155990088 abstract "The T560 B lymphoma produces polyreactive IgG2a with the features of natural autoantibody. All T560 cells bear and secrete IgG2a but a small fraction spontaneously co-express IgA. Cells secreting IgA alone cannot be detected. IgA secretion is enhanced by interaction of T560 cells either with activated T cells and cognate antigen, or with LPS, but not with cytokines, including IL-5 and TGF-beta. IgA and IgG2a mRNAs have identical V186.2. DFL 16 and JH1 sequences from framework 2 through JH1. PCR analysis reveals that previous recombination events have led to deletion of the mu, gamma3, gamma1, gamma2b constant region genes from both the productive and the unproductive chromosome but the former has retained gamma2a, epsilon and alpha, the latter only alpha. Digestion-circularization (DC)-PCR experiments provide formal proof of DNA recombination between Ca and the intron upstream of Cmu. Evidently, the productive chromosome has switched only as far as gamma2a, the unproductive all the way to the alpha constant region gene. The unproductive allele is transcriptionally active as evidenced by the presence of mRNA encoding Calphal inappropriately spliced to a cryptic splice site in the downstream intron of DQ52 (eliminated from the productive chromosome). A specific RT-PCR using oligonucleotide primers derived from the upstream initiation site of the Ialpha exon and from Calpha1 discloses that T560 cells contain alpha-germ line mRNA, presumably transcribed from the Ialpha-region of the productive chromosome, spliced to Calpha. Treatment with LPS stops production of these spliced transcripts suggesting that it may promote either DNA recombination in cells spontaneously transcribing Ialpha or a change in splicing such that Ialpha sequence is no longer joined to Calpha. Verification of the DC-PCR product by sequencing reveals that the T560 and B10.A IgA (Ig2b allotype) hinge is different from the BALB/c IgA (Ig2a allotype) hinge: it has two extra Cys and has eliminated the first Thr, a potential glycosylation site in BALB/c IgA." @default.
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• W2155990088 date "2001-01-01" @default.
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• W2155990088 title "IgG2a and IgA Co-Expression by the Natural Autoantibody-producing Murine B Lymphoma T560" @default.
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• W2155990088 doi "https://doi.org/10.3109/08916930109008046" @default.
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