title: Preferential solubilization of Triton X-100 resistant nuclear glucocorticoid receptors by deoxyribonuclease I.
abstract: Nuclei, prepared by hypo-osmotic lysis from rat thymocytes that had been incubated at 37 degrees C with 20 nM [1,2,4-3H] triamcinolone acetonide, contained 2600-2800 stably and specifically bound steroid molecules per nucleus, 70-80% of which were retained after treatment with Triton X-100. DNAase I was more effective than DNAase II in solubilizing detergent-resistant glucocorticoid-receptor complexes from nuclei at both 0 degrees C and 37 degrees C; at 0 degrees C, DNAase I digestion released 50-55% of the bound steroid with only 10% digestion of DNA. These results imply that the glucocorticoid-receptor complex is preferentially associated with transcriptionally active chromatin.
mesh_terms: D000818:Animals; D003850:Deoxyribonuclease I; D004706:Endodeoxyribonucleases / Q000378:metabolism*; D008297:Male; D017830:Octoxynol; D011092:Polyethylene Glycols; D051381:Rats; D011919:Rats, Inbred Strains; D011965:Receptors, Glucocorticoid / Q000378:metabolism*; D011987:Receptors, Steroid / Q000378:metabolism*; D012995:Solubility; D013950:Thymus Gland / Q000378:metabolism; D014222:Triamcinolone Acetonide / Q000494:pharmacology
chemical_list: D011965:Receptors, Glucocorticoid; D011987:Receptors, Steroid; D011092:Polyethylene Glycols; D017830:Octoxynol; D004706:Endodeoxyribonucleases; D003850:Deoxyribonuclease I; C019329:deoxyribonuclease II; D014222:Triamcinolone Acetonide