α-1 Adrenergic receptors are localized on presynaptic elements in the nucleus accumbens and regulate mesolimbic dopamine transmission.

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
Darlene A MitranoDavid Weinshenker

Abstract

Brainstem noradrenergic neurons innervate the mesocorticolimbic reward pathway both directly and indirectly, with norepinephrine facilitating dopamine (DA) neurotransmission via α1-adrenergic receptors (α1ARs). Although α1AR signaling in the prefrontal cortex (PFC) promotes mesolimbic transmission and drug-induced behaviors, the potential contribution of α1ARs in other parts of the pathway, such as the ventral tegmental area (VTA) and nucleus accumbens (NAc), has not been investigated before. We found that local blockade of α1ARs in the medial NAc shell, but not the VTA, attenuates cocaine- and morphine-induced locomotion. To determine the neuronal substrates that could mediate these effects, we analyzed the cellular, subcellular, and subsynaptic localization of α1ARs and characterized the chemical phenotypes of α1AR-containing elements within the mesocorticolimbic system using single and double immunocytochemical methods at the electron microscopic (EM) level. We found that α1ARs are found mainly extra-synaptically in axons and axon terminals in the NAc and are enriched in glutamatergic and dopaminergic elements. α1ARs are also abundant in glutamatergic terminals in the PFC, and in GABA-positive terminals in the VTA. In line w...Continue Reading

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Jan 17, 2013·Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology·Michel M M VerheijAlexander R Cools
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