title: Interaction of sodium thiocyanate with rat hepatic glucocorticoid-receptor complexes.
abstract: 0.1-0.3 M sodium thiocyanate greatly enhanced the rate of inactivation of unbound rat hepatic glucocorticoid receptors in vitro at 4 degrees C. Prior treatment of the unbound glucocorticoid receptor with 10 mM molybdate (at 25 degrees C for 30 min) protected the receptor from 0.3 M KCl, but not from 0.3 M NaSCN inactivation. When the [3H]dexamethasone-receptor complex was examined on sucrose density gradients containing 0.1 M NaSCN, the receptor sedimented as a 4 S complex rather than the 7 S form observed in 0.1 M KCl gradients. NaSCN was found to be more effective in the extraction of both in vivo and in vitro nuclear-bound [3H]dexamethasone-receptor complexes than KCl. At a concentration of 0.3 M, NaSCN extracted most of the specific nuclear-bound receptor. 50 mM NaSCN significantly blocked the thermal activation of preformed [3H]dexamethasone-receptor complexes. The chaotropic salt, NaSCN, appears therefore to have significant effects on glucocorticoid receptors in vitro. In addition, NaSCN appears to be a useful agent in quantitative extraction of steroid from nuclear-bound steroid-receptor complexes.
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000187:drug effects / Q000378:metabolism; D003600:Cytosol / Q000378:metabolism; D003907:Dexamethasone / Q000378:metabolism; D008099:Liver / Q000378:metabolism*; D051381:Rats; D011965:Receptors, Glucocorticoid / Q000187:drug effects / Q000302:isolation & purification / Q000378:metabolism*; D011987:Receptors, Steroid / Q000378:metabolism*; D013861:Thiocyanates / Q000494:pharmacology*
chemical_list: D011965:Receptors, Glucocorticoid; D011987:Receptors, Steroid; D013861:Thiocyanates; C028697:dexamethasone receptor; C024553:sodium thiocyanate; D003907:Dexamethasone