Characterization of a cytosolic inhibitor of calf estrogen receptor binding to nuclei.
An inhibitory component that diminishes estrogen receptor (ER) binding to nuclei in vitro is present in cytosol prepared from calf uterus. The inhibitor is heat stable and resistant to enzymatic treatment with trypsin, chymotrypsin, proteinase K, deoxyribonuclease I, or ribonucleases A, T1, and U2. Results of chromatography on DEAE-cellulose and Sephadex G-150 indicate that the factor is a negatively charged macromolecule. Inhibitory activity is sensitive to sequential digestion with chondroitinase ABC, hyaluronidase, and heparinase. Approximately 70% of the inhibitory activity is destroyed by treatment with heparinase alone. Heparitinase destroys only 30% of this activity. Furthermore, the addition of pure hyaluronic acid or chondroitin sulfate to the ER-nuclei binding assay results in little inhibition, whereas addition of heparin inhibits 75% of receptor binding. Overall, these results indicate that glycosaminoglycans, present in bovine uterine cytosol, are capable of inhibiting ER-nuclei interactions. The most potent inhibitory glycosaminoglycan displays heparin-like characteristics.
Lerea
C C
CC
Klinge
C M
CM
Bambara
R A
RA
Zain
S
S
Hilf
R
R
D000818:Animals; D002417:Cattle; D002467:Cell Nucleus / Q000378:metabolism*; D002810:Chondroitinases and Chondroitin Lyases / Q000494:pharmacology; D003600:Cytosol / Q000032:analysis; D003850:Deoxyribonuclease I / Q000494:pharmacology; D004958:Estradiol / Q000378:metabolism; D005260:Female; D006025:Glycosaminoglycans / Q000302:isolation & purification / Q000494:pharmacology*; D006493:Heparin / Q000494:pharmacology*; D019763:Heparin Lyase; D006358:Hot Temperature; D006821:Hyaluronoglucosaminidase / Q000494:pharmacology; D046911:Macromolecular Substances; D010447:Peptide Hydrolases / Q000494:pharmacology; D011133:Polysaccharide-Lyases / Q000494:pharmacology; D011960:Receptors, Estrogen / Q000187:drug effects* / Q000378:metabolism; D012260:Ribonucleases / Q000494:pharmacology; D014599:Uterus / Q000032:analysis*
D006025:Glycosaminoglycans; D046911:Macromolecular Substances; D011960:Receptors, Estrogen; D004958:Estradiol; D006493:Heparin; D012260:Ribonucleases; D003850:Deoxyribonuclease I; D006821:Hyaluronoglucosaminidase; D010447:Peptide Hydrolases; D002810:Chondroitinases and Chondroitin Lyases; D011133:Polysaccharide-Lyases; D019763:Heparin Lyase