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Abstract

G-protein-linked serotonin receptors in mouse kidney exhibit identical properties to 5-HT1b receptors in brain.

R D Ciaranello, G L Tan and R Dean
Journal of Pharmacology and Experimental Therapeutics March 1990, 252 (3) 1347-1354;
R D Ciaranello
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G L Tan
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R Dean
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Abstract

The serotonin 1b (5-HT1b) receptor is thought to mediate both pre- and postsynaptic actions of serotonin. Until recently 5-HT1b sites were thought to be present only in rodent brain. We now report the presence of high-affinity [125I]iodocyanopindolol [( 125I] ICYP) binding sites in the mouse renal medulla with properties identical to those of brain 5-HT1b receptors. In vitro receptor autoradiography demonstrates that [125I]ICYP binding is highly localized to the outer stripe of the renal medulla. Association and dissociation kinetics, saturation analysis and competition displacement analyses indicate that renal medullary [125I]ICYP binding sites exhibit identical properties with brain 5-HT1b receptors. Incubation of renal medullary or brain membranes with guanylimidodiphosphate results in a decreased affinity of 5-HT1b sites for 5-HT and [125I]ICYP; this can be reversed by the addition of a purified mixture of G proteins (Gi/Go). Treatment of brain or kidney membranes with N-ethylmaleimide results in a decrease in 5-HT1b binding which can also be restored by reconstitution with purified G proteins. Adenylyl cyclase from renal medullary homogenates or minces can be stimulated more than 3-fold by forskolin and attenuated by 5-HT. These results indicate that mouse kidney contains high-affinity 5-HT1b receptors with identical properties to those found in brain. These are localized in the outer stripe of the renal medulla and are functionally coupled to adenylyl cyclase inhibitor (Gi) G-proteins.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 252, Issue 3
1 Mar 1990
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Abstract

G-protein-linked serotonin receptors in mouse kidney exhibit identical properties to 5-HT1b receptors in brain.

R D Ciaranello, G L Tan and R Dean
Journal of Pharmacology and Experimental Therapeutics March 1, 1990, 252 (3) 1347-1354;

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Abstract

G-protein-linked serotonin receptors in mouse kidney exhibit identical properties to 5-HT1b receptors in brain.

R D Ciaranello, G L Tan and R Dean
Journal of Pharmacology and Experimental Therapeutics March 1, 1990, 252 (3) 1347-1354;
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