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. 1984 Mar;81(6):1609–1613. doi: 10.1073/pnas.81.6.1609

Monoclonal antibodies against the rat liver glucocorticoid receptor.

S Okret, A C Wikström, O Wrange, B Andersson, J A Gustafsson
PMCID: PMC344967  PMID: 6200880

Abstract

Splenic cells from one BALB/c mouse and one C57/BL mouse, immunized with purified rat liver glucocorticoid receptor (GR), were fused with the mouse myeloma cell line Sp 2/0-Ag 14. Screening for production of anti-GR-antibodies by the hybridomas was carried out with an enzyme-linked immunosorbent assay, using partially purified rat liver GR as antigen. Further screening was by a second-antibody immunoprecipitation assay using [3H]triamcinolone acetonide-GR complex from rat liver cytosol as tracer. Hybridomas from 10 different microplate wells, positive in both assays, were successfully cloned by the limiting dilution method to monoclonality. The different origins of the monoclonal antibodies were confirmed by their various isoelectric points when analyzed by isoelectric focusing. Four of the monoclonal hybridoma cell lines secreted IgM antibodies; two, IgG1; three, IgG2a; and one, IgG2b. The GR-antibody complex was identified in glycerol density gradients by a shift of the 4S GR to an 8.5S or 19S GR-antibody complex when incubated with monoclonal IgG or IgM antibody, respectively. The 10 monoclonal antibodies recognized different determinants on the GR, all situated on that domain of the receptor that is separate from the ligand and DNA-binding domains. Also, the cross-reactivity to the mouse liver GR varied among the monoclonal antibodies. No cross-reactivity was observed to the human lymphocytic GR. NaDodSO4 electrophoresis of a 0.5% pure GR preparation followed by immunoblotting using one of the monoclonal antibodies identified a single peptide with a molecular weight of 94,000, identical to the purified rat liver GR.

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Selected References

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