• Neuroscience · Dec 2024

    Microdosing of a kappa opioid receptor agonist within proximal nucleus accumbens shell microstructures revealing opposing behavioral outcomes.

    • Erin B Rousseau, Hannah D Jackson, Suman Guha, Sydney S Sherman, Michael Cima, and Elena H Chartoff.
    • Harvard-MIT Program in Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, USA.
    • Neuroscience. 2024 Dec 17; 563: 261267261-267.

    AbstractTargeted intracranial delivery of molecularly-specific therapies within intricate brain structures poses a formidable challenge due to the heterogeneity of neuronal phenotypes and functions. Here we report the use of an implantable, miniaturized neural drug delivery system permitting dynamic adjustment of pharmacotherapies. Specifically, we exploit the spatial accuracy afforded by this method for targeting modulation of neuronal microstructures. Kappa opioid receptors (KOR) within the dorsal medial nucleus accumbens shell (NASh) are selectively activated through micro infusions of the KOR agonist, U-50488. Remarkably, we demonstrate that micro infusions of U-50488 into the dorsal NASh induces reward-like conditioned place preferences, whereas a mere 1 mm shift ventrally results in conditioned place aversions. The striking precision afforded by this method may prove useful in other neurotherapeutic interventions.Copyright © 2024 International Brain Research Organization (IBRO). Published by Elsevier Inc. All rights reserved.

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