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. 1993 Aug;79(4):568–573.

Anti-mouse red blood cell monoclonal antibodies use functionally rearranged genes from the VH J558 family and are derived from the CD5- B-lymphocyte subpopulation.

B B Scott 1, S Sadigh 1, M Stow 1, R A Mageed 1, E M Andrew 1, R N Maini 1
PMCID: PMC1421910  PMID: 7691732

Abstract

The NZB mouse strain is genetically predisposed to develop, at approximately 6 months of age, a spontaneous and severe autoimmune anaemia caused by the production of pathogenic anti-mouse red blood cell (MRBC) autoantibodies. Although it is believed that the predisposition to autoimmune anaemia is multigenic in nature, the main pathogenic mechanism is attributed to anti-MRBC autoantibodies. We have generated eight anti-MRBC monoclonal antibody (mAb)-producing hybridomas derived from splenocytes of 9- and 12-month-old NZB mice with spontaneous autoimmune anaemia to dissect the molecular and cellular mechanisms resulting in the production of these pathogenic antibodies. The predominant immunoglobulin isotype was IgG2a, produced by five out of eight hybridomas (63%), while IgM, IgG1 and IgG2b were each produced by one hybridoma cell line (12%). Antigen specificity analysis of all eight hybridomas revealed that antibodies from seven out of eight hybridomas were monospecific for MRBC antigen(s). Only one hybridoma (clone 4-16-1) cross-reacted with rat RBC. None of the hybridomas produced antibodies reactive with single- or double-stranded DNA (ss- or dsDNA). Surface and cytoplasmic staining for the CD5 antigen revealed that none of the hybridomas was derived from CD5+ B lymphocytes. All hybridomas cause anaemia when implanted intraperitoneally into normal BALB/c mice. Molecular studies of five of the eight anti-MRBC mAb reveal that all use functionally rearranged genes from the VH J558 gene family. Three of these five mAb used FL16.1 DH genes while one had a CDR3 that resulted from a fusion between two DH genes (SP2.3 and SP2.2) from the SP family.

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Selected References

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