Synaptic Microtubule-Associated Protein EB3 and SRC Phosphorylation Mediate Structural and Behavioral Adaptations During Withdrawal From Cocaine Self-Administration
| Autor: | Paul J. Kenny, Amy M. Gancarz, Marine Salery, Jacqui Rabkin, Michael E. Cahill, Yasmin L. Hurd, Rachael L. Neve, Eric J. Nestler, David M. Dietz, Zahra Jlayer, Paola Defilippi, Joseph A. Landry, Craig T. Werner, Erin S. Calipari, Diane M. Damez-Werno, Arthur Godino, Alexander C.W. Smith, Emily G. Peck |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Male Dendritic spine nucleus accumbens Microtubule-associated protein Self Administration Nucleus accumbens Medium spiny neuron Microtubules Microtubule polymerization Oncogene Protein pp60(v-src) 03 medical and health sciences Cocaine-Related Disorders Mice 0302 clinical medicine Cocaine Animals MAPRE3 Phosphorylation Research Articles Chemistry General Neuroscience Actin remodeling dendritic spines podophyllotoxin SRCIN1 Cell biology Rats Substance Withdrawal Syndrome Mice Inbred C57BL 030104 developmental biology Synapses addiction Female Microtubule-Associated Proteins 030217 neurology & neurosurgery Locomotion Proto-oncogene tyrosine-protein kinase Src |
| Popis: | Addictive behaviors, including relapse, are thought to depend in part on long-lasting drug-induced adaptations in dendritic spine signaling and morphology in the nucleus accumbens (NAc). While the influence of activity-dependent actin remodeling in these phenomena has been studied extensively, the role of microtubules and associated proteins remains poorly understood. We report that pharmacological inhibition of microtubule polymerization in the NAc inhibited locomotor sensitization to cocaine and contextual reward learning. We then investigated the roles of microtubule end-binding protein 3 (EB3) and SRC kinase in the neuronal and behavioral responses to volitionally administered cocaine. In synaptoneurosomal fractions from the NAc of self-administering male rats, the phosphorylation of SRC at an activating site was induced after 1 d of withdrawal, while EB3 levels were increased only after 30 d of withdrawal. Blocking SRC phosphorylation during early withdrawal by virally overexpressing SRCIN1, a negative regulator of SRC activity known to interact with EB3, abolished the incubation of cocaine craving in both male and female rats. Conversely, mimicking the EB3 increase observed after prolonged withdrawal increased the motivation to consume cocaine in male rats. In mice, the overexpression of either EB3 or SRCIN1 increased dendritic spine density and altered the spine morphology of NAc medium spiny neurons. Finally, a cocaine challenge after prolonged withdrawal recapitulated most of the synaptic protein expression profiles observed at early withdrawal. These findings suggest that microtubule-associated signaling proteins such as EB3 cooperate with actin remodeling pathways, notably SRC kinase activity, to establish and maintain long-lasting cellular and behavioral alterations following cocaine self-administration. SIGNIFICANCE STATEMENT Drug-induced morphological restructuring of dendritic spines of nucleus accumbens neurons is thought to be one of the cellular substrates of long-lasting drug-associated memories. The molecular basis of these persistent changes has remained incompletely understood. Here we implicate for the first time microtubule function in this process, together with key players such as microtubule-bound protein EB3 and synaptic SRC phosphorylation. We propose that microtubule and actin remodeling cooperate during withdrawal to maintain the plastic structural changes initially established by cocaine self-administration. This work opens new translational avenues for further characterization of microtubule-associated regulatory molecules as putative drug targets to tackle relapse to drug taking. |
| Databáze: | OpenAIRE |
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