title: Selected properties of [3H]prostaglandin E1 binding to dispersed bovine luteal cells.
abstract: Selected properties of [3H]prostaglandin (PG) E1 binding to collagenase dispersed bovine luteal cells were studied and compared with those observed in luteal plasma membranes. [3H]-PGE1 specific binding to a relatively homogeneous population of luteal cells was a rapid (K1 = 4.2 X 10(5) M-1 .sec-1), reversible (K-1 = 3.9 X 10(-3) sec-1), saturable and specific process at 38 degrees C. The binding was homogeneous with an apparent dissociation constant of 2.4 nM and 1.8 X 10(5) receptors per cell. The presence of increasing amounts of unlabeled PGs inhibited [3H]PGE1 binding in a dose-dependent manner. The potency order for this inhibition of binding was: PGE 2 greater than PGE1, (15S)-15-methyl-PGE2 methyl ester greater than PGF2alpha greater than PGF1alpha greater than other PGs, PGE, PGF metabolites and PGF analogs. Other than the homogeneous nature of [3H]PGE1 binding and the greater effectiveness of PGE2 compared to PGE1 in cells, the rest of the properties of [3H]PGE1 binding to cells were in excellent agreement with those observed in plasma membranes.
mesh_terms: D000818:Animals; D002417:Cattle; D002462:Cell Membrane / Q000378:metabolism; D003338:Corpus Luteum / Q000378:metabolism*; D005260:Female; D007700:Kinetics; D008184:Luteal Cells / Q000378:metabolism*; D011453:Prostaglandins / Q000378:metabolism; D011458:Prostaglandins E / Q000378:metabolism*; D011956:Receptors, Cell Surface / Q000378:metabolism*; D011982:Receptors, Prostaglandin / Q000378:metabolism*; D013329:Structure-Activity Relationship; D013696:Temperature
chemical_list: D011453:Prostaglandins; D011458:Prostaglandins E; D011956:Receptors, Cell Surface; D011982:Receptors, Prostaglandin