Distinct miRNA expression in dorsal striatal subregions is associated with risk for addiction in rats
Autor: | Christopher V. Dayas, Belinda J. Goldie, Doug W. Smith, Murray J. Cairns, Amanda L. Brown, Emily M. Levi, R. K. Quinn, Phillip W. Dickson |
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Rok vydání: | 2015 |
Předmět: |
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Drug-Seeking Behavior Nerve Tissue Proteins Striatum Cocaine-Related Disorders Cellular and Molecular Neuroscience mental disorders microRNA Neuroplasticity Gene expression Animals RNA Messenger Biological Psychiatry media_common Neuronal Plasticity Arc (protein) Behavior Animal Gene Expression Profiling Addiction Corpus Striatum Rats Neostriatum Gene expression profiling Cytoskeletal Proteins Disease Models Animal MicroRNAs Psychiatry and Mental health Synaptic plasticity Original Article Psychology Neuroscience |
Zdroj: | Translational Psychiatry |
ISSN: | 2158-3188 |
Popis: | Recently, we published data using an animal model that allowed us to characterize animals into two groups, addiction vulnerable and addiction resilient, where we identified that addiction/relapse vulnerability was associated with deficits in synaptic plasticity-associated gene expression in the dorsal striatum (DS). Notable was the strong reduction in expression for activity-regulated cytoskeleton-associated protein (Arc) considered a master regulator of synaptic plasticity. In the present study, we confirmed that Arc messenger RNA was significantly decreased in the DS, but importantly, we identified that this reduction was restricted to the dorsomedial (DMS) and not dorsolateral striatum (DLS). There is recent evidence of microRNA (miRNA)-associated posttranscriptional suppression of Arc and animal models of addiction have identified a key role for miRNA in the regulation of addiction-relevant genes. In further support of this link, we identified several differentially expressed miRNA with the potential to influence addiction-relevant plasticity genes, including Arc. A key study recently reported that miR-212 expression is protective against compulsive cocaine-seeking. Supporting this hypothesis, we found that miR-212 expression was significantly reduced in the DMS but not DLS of addiction-vulnerable animals. Together, our data provide strong evidence that miRNA promote ongoing plasticity deficits in the DS of addiction-vulnerable animals. |
Databáze: | OpenAIRE |
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