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G(olf) and Gs in rat basal ganglia: possible involvement of G(olf) in the coupling of dopamine D1 receptor with adenylyl cyclase

D Herve, M Levi-Strauss, I Marey-Semper, C Verney, JP Tassin, J Glowinski and JA Girault
Journal of Neuroscience 1 May 1993, 13 (5) 2237-2248; DOI: https://doi.org/10.1523/JNEUROSCI.13-05-02237.1993
D Herve
Chaire de Neuropharmacologie, INSERM U 114, College de France, Paris.
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M Levi-Strauss
Chaire de Neuropharmacologie, INSERM U 114, College de France, Paris.
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I Marey-Semper
Chaire de Neuropharmacologie, INSERM U 114, College de France, Paris.
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C Verney
Chaire de Neuropharmacologie, INSERM U 114, College de France, Paris.
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JP Tassin
Chaire de Neuropharmacologie, INSERM U 114, College de France, Paris.
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J Glowinski
Chaire de Neuropharmacologie, INSERM U 114, College de France, Paris.
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JA Girault
Chaire de Neuropharmacologie, INSERM U 114, College de France, Paris.
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Abstract

Using specific antibodies and cDNA probes, we have investigated, in rat basal ganglia, the distribution and the regulation of the expression of the alpha subunits of Gs and G(olf), two GTP-binding proteins (G- proteins) that stimulate adenylyl cyclase. We confirmed that G(olf) alpha is highly expressed in caudate-putamen, nucleus accumbens, and olfactory tubercle, whereas Gs alpha is less abundant in these areas than in the other brain regions. Intrastriatal injections of quinolinic acid decreased dramatically the levels of G(olf) alpha protein in the striatum and the substantia nigra, and those of G(olf) alpha mRNA in the striatum. Retrograde lesions of striatonigral neurons with volkensin reduced markedly the levels of D1 dopamine (DA) binding sites, as well as those of G(olf) alpha protein and mRNA in the striatum, without altering D2 binding sites. In contrast, both types of lesions increased the levels of Gs alpha protein in the striatum and substantia nigra. Immunocytochemistry showed the presence of G(olf) alpha protein in striatal medium-sized neurons and in several other neuronal populations. These results demonstrate that striatonigral neurons contain high levels of G(olf) alpha and little, if any, Gs alpha, suggesting that the coupling of D1 receptor to adenylyl cyclase is provided by G(olf) alpha. The levels of G(olf) alpha were five- to sixfold higher in the striatum than in the substantia nigra, indicating a preferential localization of G(olf) alpha in the somatodendritic region of striatonigral neurons and providing a basis for the low efficiency of D1 receptor coupling in the substantia nigra. Six weeks after 6-hydroxydopamine lesions of DA neurons, an increase in G(olf) alpha (+53%) and Gs alpha (+64%) proteins was observed in the striatum. This increase in G(olf) alpha levels may account for the DA-activated adenylyl cyclase supersensitivity, without change in D1 receptors density, that follows destruction of DA neurons. Fine regulation of the levels of G(olf) alpha in physiological or pathological situations may be a critical parameter for the efficiency of DA neurotransmission.

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The Journal of Neuroscience: 13 (5)
Journal of Neuroscience
Vol. 13, Issue 5
1 May 1993
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G(olf) and Gs in rat basal ganglia: possible involvement of G(olf) in the coupling of dopamine D1 receptor with adenylyl cyclase
D Herve, M Levi-Strauss, I Marey-Semper, C Verney, JP Tassin, J Glowinski, JA Girault
Journal of Neuroscience 1 May 1993, 13 (5) 2237-2248; DOI: 10.1523/JNEUROSCI.13-05-02237.1993

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G(olf) and Gs in rat basal ganglia: possible involvement of G(olf) in the coupling of dopamine D1 receptor with adenylyl cyclase
D Herve, M Levi-Strauss, I Marey-Semper, C Verney, JP Tassin, J Glowinski, JA Girault
Journal of Neuroscience 1 May 1993, 13 (5) 2237-2248; DOI: 10.1523/JNEUROSCI.13-05-02237.1993
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