Specificity of the beta 2-adrenergic receptor stimulating cyclic AMP accumulation in the intermediate lobe of rat pituitary gland

European Journal of Pharmacology
H Meunier, F Labrie


Changes of cyclic AMP levels were used to assess the specificity of the beta-adrenergic receptor in primary cultures of cells prepared from the intermediate lobe of rat pituitary gland. During a 4 min incubation, beta-adrenergic agonists led to a 4 to 6 fold stimulation of cyclic AMP concentration with the following order of potency (Kd values): zinterol (0.75 nM) greater than hydroxybenzylisoproterenol (1.0 nM) greater than (--)-isoproterenol (4.6 nM) greater than soterenol greater than (7.7 nM) greater than (--)-epinephrine (10 nM) greater than OPC 2009 (procaterol, 11 nM) much greater than (--)-norepinephrine (300 nM). The potent antagonists cyanopindolol, (--)-propranolol and hydroxybenzylpindolol reversed the stimulatory effect of (--)-isoproterenol at Kd values of 0.4-0.6 nM. Other beta-adrenergic antagonists had the following order of potency: pindolol = (--)-alprenolol = timolol (0.9-1.0 mM) much greater than metoprolol (100 nM) greater than dichloroisoproterenol (300 nM) greater than butoxamine (1100 nM). The beta 1-selective antagonist practolol had a low potency at 700 nM. The stereoselectivity of the receptor is indicated by the 400 to 70 fold higher potency of the (--)-isomers of isoproterenol, epinephrine and prop...Continue Reading


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