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  • Title: Antibodies against the plasma membrane 3,3',5-triiodo-L-thyronine binding protein of rat pituitary GH3 cells: partial characterization and cross-species immunoreactivity.
    Author: Hasumura S, Rossi B, Alderson R, Pastan I, Cheng S.
    Journal: Biochem Biophys Res Commun; 1984 Nov 14; 124(3):956-62. PubMed ID: 6095830.
    Abstract:
    To develop antibodies against the plasma membrane 3,3',5-triiodo-L-thyronine (T3) binding protein (M.W. 55,000), rabbits were immunized with formalin-fixed GH3 cells or highly purified plasma membranes from these cells. Antibodies were screened by immunoprecipitation using detergent solubilized N-bromoacetyl-[125I]T3-labeled 55K protein. Among the nine detergents tested, 0.18% CHAPS was found to be the best in its solubilization efficiency and its ability to maintain the integrity of the antigenicity of the 55K protein. The N-bromoacetyl-[125I]T3-labeled 55K protein was also immunoprecipitated by anti-T3 antibodies. The anti-55K protein antibodies cross-reacted with plasma membrane T3 binding proteins from cultured cells and tissues of human and rodent origin. These results indicate that structural similarities exist in human and rodent plasma membrane T3 binding proteins. These antibodies should provide a powerful tool in the characterization and in probing the function(s) of the plasma membrane T3 binding protein in cells.
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