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The Journal of Immunology, Vol 140, Issue 8 2593-2599, Copyright © 1988 by American Association of Immunologists

ARTICLES

Development of a human monoclonal antibody from a Graves' disease patient that identifies a novel thyroid membrane antigen

JR Baker Jr, NB Saunders, W Kaulfersch and KD Burman
Transplant Immunology Service, Walter Reed Army Medical Center, Washington, DC 20307.

To investigate the interaction between antibodies and the thyroid gland in Graves' disease, PBL were harvested from seven Graves' disease patients and transformed into lymphoblasts by the addition of EBV in the presence of cyclosporine A. These lymphoblasts were cloned by limiting dilution and then assayed for binding activity to human thyroglobulin, thyroid-stimulating hormone, thyroid microsome, and thyroid as well as guinea pig fat cell membranes. Four patients' cells produced antibody that bound to at least one of the Ag; a single clone from one patient that bound equally well to both thyroid and guinea pig fat cell membranes (but not to other thyroid Ag) was selected for further evaluation. Fusion of these cells with SHM-D33 heteromyeloma cells yielded three cell lines that produced genetically identical mAb. Immunostaining of human thyrocytes with this mAb demonstrated an Ag present on both nuclear and cell membranes. This Ag was identified as an 18,000 m.w. protein band on Western blots of both human thyroid and guinea pig fat cell membranes. The mAb was also able to alter thyrocyte physiology as the short term incubation of this mAb with FRTL-5 cells in vitro inhibited thyroid-stimulating hormone-mediated production of cAMP. Thus, this mAb and the Ag it identifies may be relevant to Graves' disease.


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