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J. Biol. Chem., Vol. 258, Issue 6, 3496-3502, Mar, 1983
M Staehelin, P Simons, K Jaeggi and N Wigger
A new, hydrophilic beta-adrenergic receptor radioligand, (+/-)-[3H]CGP-
12177 (4-(3-tertiarybutylamino-2-hydroxypropoxy)-benzimidazole-2-on
hydrochloride), was synthesized and radiolabeled to 40 Ci/mmol. The
nonspecific binding of this compound to turkey erythrocyte ghosts and C6
glioma cell membranes was less than 5% of the total binding at five times
the appropriate KD. Binding assays of intact C6 glioma cells also showed
low nonspecific binding, less than 20% of the total binding at five times
the appropriate KD. The affinities of the antagonists (-)- and
(+)-propranolol as well as of the agonist (-)-isoproterenol were examined
by their potency to displace various radioligands from intact C6 glioma
cell and membrane preparations. With membrane preparations, both [3H]
CGP-12177 and [3H]dihydroalprenolol (DHA) were displaced stereospecifically
by the antagonists (-)- and (+)-propranolol and the agonist
(-)-isoproterenol. With whole cells, [3H]CGP-12177 and [3H]DHA behaved
differently. [3H]DHA and [3H]carazolol could be stereospecifically
displaced by antagonists but only partially displaced by agonists, while
[3H]CGP-12177 could be completely displaced by both antagonists and
agonists as in membranes. In contrast to [3H]CGP-12177, the lipophilic
ligand [3H]DHA is actually taken up by cells. The inability of agonists to
displace lipophilic radioligands from receptors on intact cells may not be
due to a low affinity of agonists for receptors on cells, but to an
agonist-induced change in the receptors which renders them inaccessible to
hydrophilic agonists and antagonists. This change is likely to be their
internalization into the cell.
CGP-12177. A hydrophilic beta-adrenergic receptor radioligand reveals high affinity binding of agonists to intact cells
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