title: Human androgen insensitivity mutation does not alter oligonucleotide recognition by the androgen receptor-DHT complex.
abstract: We studied the binding of dihydrotestosterone-receptor complexes (DHT-R) from human genital skin fibroblasts to oligodeoxyribonucleotides and DNA. Following incubation of fibroblasts with 2 nM [3H]DHT (45 min, 37 degrees C), DHT-R were prepared as total fibroblast sonicates (sonication of cells in 0.5 M KCl), intact fibroblast cytosol (100000 X g supernatant) or intact fibroblast nuclear extract (sonication of nuclei in 0.5 M KCl). DHT-R were also prepared by incubation of fractionated fibroblast cytosol with 4 nM [3H]DHT (4 h, 0 degrees C). Optimal conditions were established for binding of DHT-R from total fibroblast sonicates to oligo-dT cellulose: 60 min, 0 degrees C, low salt (0.05-0.10 M KCl), linearity with DHT-R concentration, and nucleotide saturation. With total fibroblast sonicates the rank order of DHT-R binding was oligo-dT approximately equal to -dG greater than DNA greater than -dC greater than or equal to -dA approximately equal to -dI. Intact fibroblast cytosol displayed a similar preference of DHT-R binding to oligo-dT and -dG but the binding was quantitatively higher than for total fibroblast sonicates, the binding for fractionated fibroblast cytosolic DHT-R formed at 0 degrees C being quantitatively lower. However, binding of DHT-R from cytosol (0 degrees C) to DNA-cellulose was equal to that for DHT-R from cytosol (37 degrees C). Binding of DHT-R from intact fibroblast nuclear extracts was lower than for total fibroblast sonicates. Preparations from cells of patients with receptor-negative, complete androgen insensitivity lacked both DHT-R formation and specific oligonucleotide binding. Binding of oligonucleotides to DHT-R from cells of patients with receptor-positive, complete androgen insensitivity could not be distinguished from that of normal cells. These results suggest: (a) androgen receptor-steroid complexes recognize and bind to certain preferred deoxyribonucleotides; (b) various factors affect the quantitative binding of DHT-R from different cellular preparations to deoxyribonucleotides; and (c) neither qualitative nor quantitative abnormalities for DHT-R of complete androgen-insensitive patients were detectable from oligonucleotide or DNA binding.
mesh_terms: D004247:DNA / Q000378:metabolism; D013196:Dihydrotestosterone / Q000378:metabolism*; D005347:Fibroblasts / Q000378:metabolism; D006801:Humans; D008297:Male; D009154:Mutation; D009838:Oligodeoxyribonucleotides / Q000378:metabolism; D009841:Oligonucleotides / Q000378:metabolism*; D011944:Receptors, Androgen / Q000378:metabolism*; D011965:Receptors, Glucocorticoid / Q000378:metabolism; D011987:Receptors, Steroid / Q000378:metabolism*
chemical_list: D009838:Oligodeoxyribonucleotides; D009841:Oligonucleotides; D011944:Receptors, Androgen; D011965:Receptors, Glucocorticoid; D011987:Receptors, Steroid; D013196:Dihydrotestosterone; D004247:DNA