CHARACTERIZATION OF THE GLUCOCORTICOID RECEPTOR TRANSLOCATED TO THE NUCLEUS IN INTACT AtT-20 MOUSE PITUITARY TUMOR CELLS AT LOW TEMPERATURES
| Autor: | Janelle Williams, Frank Svec |
|---|---|
| Rok vydání: | 1983 |
| Předmět: |
Receptors
Steroid medicine.medical_specialty Chemical Phenomena Sodium molybdate Dexamethasone Cell Line Mice chemistry.chemical_compound Receptors Glucocorticoid Endocrinology Glucocorticoid receptor Internal medicine medicine Animals Pituitary Neoplasms Receptor Stokes radius Cell Nucleus Chemistry Physical Charge density Neoplasms Experimental Cold Temperature medicine.anatomical_structure Nuclear receptor chemistry Agarose Nucleus |
| Zdroj: | Endocrinology. 113:1528-1530 |
| ISSN: | 1945-7170 0013-7227 |
| Popis: | Although low temperatures retard the nuclear translocation of glucocorticoid-receptor complexes, they do not completely inhibit it. To gain insight into the mechanism of nuclear translocation, we determined the Stokes radius and surface charge density of the receptors bound to the nucleus at 0 C and compared them with the values obtained from standard preparations of activated and unactivated glucocorticoid receptors. Specifically, intact, viable AtT-20 cells were incubated at 0 C for 3 h with 10 nM tritiated triamcinolone acetonide and the nuclear receptor extracted with 0.3 M KCl/20 mM sodium molybdate. These nuclear receptors were found to elute from an Agarose A 1.5 m column with a Stokes radius identical to that of an "activated" receptor (6.4 nm) but eluted from a DEAE column at the same position as an "unactivated" species (0.17 M KCl). From these results we hypothesize that the change in receptor structure that leads to nuclear binding is a multistep process, and although the change in molecular size may be a prerequisite for nuclear binding, the change in surface charge is not. |
| Databáze: | OpenAIRE |
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