Abstract:
:Antisera raised against human lymphoid glucocorticoid receptors were used in combination with the glucocorticoid receptor affinity label [3H]dexamethasone 21-mesylate [( 3H]DM) to identify the glucocorticoid receptors of the human B-lymphoblastoid cell line IM-9 and the human T-cell leukemic cell line CEM-C7. Antisera were obtained following immunization of New Zealand White rabbits with [3H]triamcinolone acetonide [( 3H]TA)-glucocorticoid receptor complexes partially purified by two-stage DNA-cellulose chromatography. The presence of anti-human glucocorticoid receptor antibodies was verified by: (a) adsorption of [3H]TA-receptor-antibody complexes to Protein A; (b) a shift to higher apparent molecular weight in the elution position from Sephacryl S300 of [3H]TA-receptor complexes incubated with immune serum; and (c) the ability of immune serum to displace [3H]TA-receptor complexes on sucrose gradients. These antibodies also recognized rat liver and murine S49 cell glucocorticoid receptors. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of [3H]DM-labeled IM-9 cytosol identified a major competable band with a molecular weight of approximately 90,000, three minor competable components with molecular weights of approximately 78,000, approximately 51,000, and approximately 38,500, and at least 21 other noncompetable components. Following immunoprecipitation of [3H]DM-labeled cytosol with immune serum, only the Mr 90,000 and 78,000 components were seen. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of [3H]DM-labeled CEM-C7 cytosol revealed a larger number of [3H]DM-labeled components. However, after immunoprecipitation of [3H]DM-labeled CEM-C7 cytosol, a predominant competable component with a molecular weight of 90,000 was easily identified. This component was markedly diminished when cytosols from the glucocorticoid receptor-deficient cell line ICR-27 were used. Thus, the combination of affinity labeling and anti-human glucocorticoid receptor antibodies is capable of providing direct physical identification of human lymphoid glucocorticoid receptors.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Harmon JM,Eisen HJ,Brower ST,Simons SS Jr,Langley CL,Thompson EBsubject
Has Abstractpub_date
1984-10-01 00:00:00pages
4540-7issue
10eissn
0008-5472issn
1538-7445journal_volume
44pub_type
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