Optogenetic inhibition of D1R containing nucleus accumbens neurons alters cocaine-mediated regulation of Tiam1

Ramesh Chandra, Jeffrey Lenz, Amy M. Gancarz, Dipesh Chaudhury, Gabrielle L. Schroeder, Ming Hu Han, Joseph F. Cheer, David M. Dietz, Mary Kay Lobo

    Research output: Contribution to journalArticle

    Abstract

    Exposure to psychostimulants results in structural and synaptic plasticity in striatal medium spiny neurons (MSNs). These cellular adaptations arise from alterations in genes that are highly implicated in the rearrangement of the actin cytoskeleton, such as Tiam1. Previous studies have demonstrated a crucial role for dopamine receptor 1 (D1)-containing striatal MSNs in mediating psychostimulant induced plasticity changes. These D1-MSNs in the nucleus accumbens (NAc) positively regulate drug seeking, reward, and locomotor behavioral effects as well as the morphological adaptations of psychostimulant drugs. Here, we demonstrate that rats that actively self-administer cocaine display reduced levels of Tiam1 in the NAc. To further examine the cell type specific contribution to these changes in Tiam1 we used optogenetics to selectively manipulate NAc D1-MSNs or dopamine receptor 2 (D2) expressing MSNs. We find that repeated ChR2 activation of D1-MSNs but not D2-MSNs caused a down-regulation of Tiam1 levels similar to the effects of cocaine. Further, activation of D2-MSNs, which caused a late blunted cocaine-mediated locomotor behavioral response, did not alter Tiam1 levels. We then examined the contribution of D1-MSNs to the cocaine-mediated decrease of Tiam1. Using the light activated chloride pump, eNpHR3.0, we selectively inhibited D1-MSNs during cocaine exposure, which resulted in a behavioral blockade of cocaine-induced locomotor sensitization. Moreover, inhibiting these NAc D1-MSNs during cocaine exposure reversed the down-regulation of Tiam1 gene expression and protein levels. These data demonstrate that altering activity in specific neural circuits with optogenetics can impact the underlying molecular substrates of psychostimulant mediated behavior and function.

    Original languageEnglish (US)
    JournalFrontiers in Molecular Neuroscience
    Issue numberMAY
    DOIs
    StatePublished - May 13 2013

    Fingerprint

    Optogenetics
    Nucleus Accumbens
    Dopamine Receptors
    Cocaine
    Neurons
    Corpus Striatum
    Inhibition (Psychology)
    Down-Regulation
    Neuronal Plasticity
    Gene Expression Regulation
    Actin Cytoskeleton
    Reward
    Pharmaceutical Preparations
    Chlorides

    Keywords

    • Cocaine
    • Medium spiny neurons
    • Nucleus accumbens
    • Optogenetics
    • Tiam1

    ASJC Scopus subject areas

    • Molecular Biology
    • Cellular and Molecular Neuroscience

    Cite this

    Optogenetic inhibition of D1R containing nucleus accumbens neurons alters cocaine-mediated regulation of Tiam1. / Chandra, Ramesh; Lenz, Jeffrey; Gancarz, Amy M.; Chaudhury, Dipesh; Schroeder, Gabrielle L.; Han, Ming Hu; Cheer, Joseph F.; Dietz, David M.; Kay Lobo, Mary.

    In: Frontiers in Molecular Neuroscience, No. MAY, 13.05.2013.

    Research output: Contribution to journalArticle

    Chandra, R, Lenz, J, Gancarz, AM, Chaudhury, D, Schroeder, GL, Han, MH, Cheer, JF, Dietz, DM & Kay Lobo, M 2013, 'Optogenetic inhibition of D1R containing nucleus accumbens neurons alters cocaine-mediated regulation of Tiam1', Frontiers in Molecular Neuroscience, no. MAY. https://doi.org/10.3389/fnmol.2013.00013
    Chandra, Ramesh ; Lenz, Jeffrey ; Gancarz, Amy M. ; Chaudhury, Dipesh ; Schroeder, Gabrielle L. ; Han, Ming Hu ; Cheer, Joseph F. ; Dietz, David M. ; Kay Lobo, Mary. / Optogenetic inhibition of D1R containing nucleus accumbens neurons alters cocaine-mediated regulation of Tiam1. In: Frontiers in Molecular Neuroscience. 2013 ; No. MAY.
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    AU - Chaudhury, Dipesh

    AU - Schroeder, Gabrielle L.

    AU - Han, Ming Hu

    AU - Cheer, Joseph F.

    AU - Dietz, David M.

    AU - Kay Lobo, Mary

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