Activation of nociceptin/orphanin FQ-NOP receptor system inhibits tyrosine hydroxylase phosphorylation, dopamine synthesis, and dopamine D(1) receptor signaling in rat nucleus accumbens and dorsal striatum

Journal of Neurochemistry
Maria C OlianasPierluigi Onali

Abstract

Nociceptin/orphanin FQ (N/OFQ) has been reported to inhibit dopamine (DA) release in basal ganglia mainly by acting on NOP receptors in substantia nigra and ventral tegmental area. We investigated whether N/OFQ could affect DA transmission by acting at either DA nerve endings or DA-targeted post-synaptic neurons. In synaptosomes of rat nucleus accumbens and striatum N/OFQ inhibited DA synthesis and tyrosine hydroxylase (TH) phosphorylation at Ser40 via NOP receptors coupled to inhibition of the cAMP/protein kinase A pathway. Immunofluorescence studies showed that N/OFQ preferentially inhibited phospho-Ser40-TH in nucleus accumbens shell and that in this subregion NOP receptors partly colocalized with either TH or DA D(1) receptor positive structures. In accumbens and striatum N/OFQ inhibited DA D(1) receptor-stimulated cAMP formation, but failed to affect either adenosine A(2A) or DA D(2) receptor regulation of cAMP. In accumbens slices, N/OFQ inhibited DA D(1)-induced phosphorylation of NMDA and alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate glutamate receptors, whereas in primary cultures of accumbal cells, which were found to coexpress NOP and DA D(1) receptors, N/OFQ curtailed DA D(1) receptor-induced cAMP-response el...Continue Reading

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Dec 25, 2009·Neurotoxicity Research·Frederico C PereiraZbigniew K Binienda
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