Summary
Both retinoic acid and 17β-estradiol formed covalent bonds with proteins of the human breast cancer cell line MCF-7. Two-dimensional gel patterns of the labeled proteins were unique for each ligand. There were four major retinoylated proteins in MCF-7 consisting of two doublets with molecular masses of 37 kDa and 20 kDa. These proteins were designated 37a, 37b, 37c, and 20d. The extent of retinoylation was very low in a 55 kDa protein that we previously identified in the human myeloid leukemia cell line HL60 [Takahashi, N. and Breitman, T. R. (1989) J. Biol. Chem. 264, 5159–5163]. These results indicated that the protein substrates for retinoylation may vary among cell-types. About 10 proteins were labeled from 17β-estradiol. Two of these proteins had mobilities that were identitied to the retinoylated proteins 37a and 20c. These results indicate that in MCF-7 cells there are two proteins that can be retinoylated and labeled from estradiol. The demonstration that some ligands of the steroid/thyroid receptor family are covalently linked to cellular proteins suggests new mechanisms for the many effects of these agents on cells.
References
Takahashi, N.; Breitman, T. R. Retinoic acid acylation (retinoylation) of a nuclear protein in the human acute myeloid leukemia cell line HL60. J. Biol. Chem. 264:5159–5163; 1989.
Evans, R. M. The steroid and thyroid hormone receptor superfamily. Science 240:889–895; 1988.
Goldberg, Y.; Glineur, C.; Bosselut, R., et al. Thyroid hormone action and theerbA oncogene family. Biochimie 71:279–291; 1989.
Bligh, E. G.; Dyer, W. J., A rapid method of total lipid extraction and purification. Can. J. Biochem. Physiol. 37:911–917; 1959.
O’Farrell, P. H., High resolution two-dimensional electrophoresis of proteins. J. Biol. Chem. 250:4007–4021; 1975.
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This study is the first report showing that estradiol or one of its metabolic products covalently binds to proteins in the human breast cancer cell line MCF-7. Two of the proteins labeled from radioactive estradiol comigrate with proteins labeled from radioactive retinoic acid. These results suggest new mechanisms of action for the steroid and thyroid hormones.
EDITOR’S STATEMENT This study is the first report showing that estradiol or one of its metabolic products covalently binds to proteins in the human breast cancer cellline MCF-7. Two of the proteins labeled from radioactive estradiol comigrate with proteins labeled from radioactive retinoic acid. These results suggest new mechanisms of action for the steroid and thyroid hormones.
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Takahashi, N., Breitman, T.R. Covalent binding of 17β-estradiol and retinoic acid to proteins in the human breast cancer cell line MCF-7. In Vitro Cell Dev Biol 25, 1199–1200 (1989). https://doi.org/10.1007/BF02621275
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DOI: https://doi.org/10.1007/BF02621275