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Expression of striatal D1 dopamine receptors coupled to inositol phosphate production and Ca2+ mobilization in Xenopus oocytes.

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  • 1. Laboratory of Cell Biology, National Institute of Mental Health, National Institutes of Health, Bethesda, MD.
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    • Mahan LC 1
    (1 author)

Proceedings of the National Academy of Sciences of the United States of America, 01 Mar 1990, 87(6):2196-2200
https://doi.org/10.1073/pnas.87.6.2196 PMID: 1690425 PMCID: PMC53653

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Abstract 

Expression of central nervous system receptors for dopamine was examined by injection of poly(A)+ RNA (mRNA) from rat striatum into oocytes from Xenopus laevis. Electrophysiological measurements in mRNA-injected oocytes indicated that addition of 100 microM dopamine induced an inward current (40-100 nA) that was consistent with the activation of endogenous Ca2(+)-dependent Cl- channels. This current was also elicited by addition of the selective D1 agonist SKF 38393 but not by the selective D2 agonist quinpirole. Prior addition of the dopaminergic antagonist cis-piflutixol completely abolished dopamine-induced currents but had no effect on currents produced by serotonin. Using 45Ca2+ efflux assays, addition of 100 microM dopamine to injected oocytes stimulated efflux 2- to 3-fold. This increase was mimicked by SKF 38393 and was blocked by the D1-selective antagonist (+)SCH 23390 but not by the D2-selective antagonist domperidone. No increase in 45Ca2+ efflux was seen with 100 microM quinpirole. Size fractionation of striatal mRNA yielded a single peak (2.5-3.0 kilobases) of D1 receptor-mediated 45Ca2+ efflux activity in injected oocytes. In addition, dopamine stimulation of oocytes injected with peak fractions and prelabeled with myo-[3H]inositol caused a 3-fold increase in [3H]inositol 1,4,5-triphosphate [( 3H]InsP3) formation. No effect on [3H]InsP3 production or 45Ca2+ efflux was observed, however, in injected oocytes incubated with 1 mM N6,O2'-dibutyryladenosine 3',5'-cyclic monophosphate. Thus, in addition to D1 receptors that stimulate adenylyl cyclase, rat striatum contains D1 receptors that can couple to InsP3 formation and mobilization of intracellular Ca2+.

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Proc Natl Acad Sci U S A. 1990 Mar; 87(6): 2196–2200.
PMCID: PMC53653
PMID: 1690425

Expression of striatal D1 dopamine receptors coupled to inositol phosphate production and Ca2+ mobilization in Xenopus oocytes.

L C Mahan, R M Burch, F J Monsma, Jr, and D R Sibley
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Abstract

Expression of central nervous system receptors for dopamine was examined by injection of poly(A)+ RNA (mRNA) from rat striatum into oocytes from Xenopus laevis. Electrophysiological measurements in mRNA-injected oocytes indicated that addition of 100 microM dopamine induced an inward current (40-100 nA) that was consistent with the activation of endogenous Ca2(+)-dependent Cl- channels. This current was also elicited by addition of the selective D1 agonist SKF 38393 but not by the selective D2 agonist quinpirole. Prior addition of the dopaminergic antagonist cis-piflutixol completely abolished dopamine-induced currents but had no effect on currents produced by serotonin. Using 45Ca2+ efflux assays, addition of 100 microM dopamine to injected oocytes stimulated efflux 2- to 3-fold. This increase was mimicked by SKF 38393 and was blocked by the D1-selective antagonist (+)SCH 23390 but not by the D2-selective antagonist domperidone. No increase in 45Ca2+ efflux was seen with 100 microM quinpirole. Size fractionation of striatal mRNA yielded a single peak (2.5-3.0 kilobases) of D1 receptor-mediated 45Ca2+ efflux activity in injected oocytes. In addition, dopamine stimulation of oocytes injected with peak fractions and prelabeled with myo-[3H]inositol caused a 3-fold increase in [3H]inositol 1,4,5-triphosphate [( 3H]InsP3) formation. No effect on [3H]InsP3 production or 45Ca2+ efflux was observed, however, in injected oocytes incubated with 1 mM N6,O2'-dibutyryladenosine 3',5'-cyclic monophosphate. Thus, in addition to D1 receptors that stimulate adenylyl cyclase, rat striatum contains D1 receptors that can couple to InsP3 formation and mobilization of intracellular Ca2+.

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Selected References

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