The human promyelocytic leukemia cell (HL-60 cell) beta-adrenergic receptor.
We have characterized the beta-adrenergic receptor binding site and the beta-adrenergic cAMP response of the HL-60 cell. The hydrophilic ligand [3H]-(-)-CGP-12177 was specifically and reversibly bound to one single class of binding sites (Kd 220 pM and Bmax 1,970 sites/cell). The adrenergic agonists inhibited the specific radioligand binding. The order of potency was isoproterenol greater than epinephrine greater than norepinephrine. The beta-2 selective antagonist ICI 118551 had a binding affinity 3 orders of potency higher than the beta-1 selective antagonist, atenolol. The adrenergic agonists elevated the cAMP accumulation in a concentration-dependent mode. The order of potency was isoproterenol greater than epinephrine greater than norepinephrine. Both the binding and the functional studies revealed stereospecificity and reversibility. The present data show that HL-60 cells possess beta-2 adrenergic receptors functionally coupled to adenylate cyclase.
Sager
G
G
Department of Pharmacology, University of Tromsø, Norway.
Bang
B E
BE
Pedersen
M
M
Aarbakke
J
J
D000242:Cyclic AMP / Q000032:analysis; D006801:Humans; D007545:Isoproterenol / Q000494:pharmacology; D015470:Leukemia, Myeloid, Acute / Q000378:metabolism*; D011412:Propanolamines / Q000378:metabolism; D011943:Receptors, Adrenergic, beta / Q000032:analysis*; D014407:Tumor Cells, Cultured
D011412:Propanolamines; D011943:Receptors, Adrenergic, beta; D000242:Cyclic AMP; D007545:Isoproterenol; C033394:CGP 12177