title: Distinct miRNA expression in dorsal striatal subregions is associated with risk for addiction in rats.
abstract: 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.
authors: 1] Neurobiology of Addiction Laboratory, School of Biomedical Sciences and Pharmacy, University of Newcastle, Newcastle, NSW, Australia [2] The Centre for Translational Neuroscience and Mental Health Research, University of Newcastle, Newcastle, NSW, Australia [3] Hunter Medical Research Institute, Newcastle, NSW, Australia.
authors: R K
authors: RK
authors: Quinn
authors: 1] Neurobiology of Addiction Laboratory, School of Biomedical Sciences and Pharmacy, University of Newcastle, Newcastle, NSW, Australia [2] The Centre for Translational Neuroscience and Mental Health Research, University of Newcastle, Newcastle, NSW, Australia [3] Hunter Medical Research Institute, Newcastle, NSW, Australia.
authors: A L
authors: AL
authors: Brown
authors: 1] Neurobiology of Addiction Laboratory, School of Biomedical Sciences and Pharmacy, University of Newcastle, Newcastle, NSW, Australia [2] The Centre for Translational Neuroscience and Mental Health Research, University of Newcastle, Newcastle, NSW, Australia [3] Hunter Medical Research Institute, Newcastle, NSW, Australia.
authors: B J
authors: BJ
authors: Goldie
authors: 1] Neurobiology of Addiction Laboratory, School of Biomedical Sciences and Pharmacy, University of Newcastle, Newcastle, NSW, Australia [2] The Centre for Translational Neuroscience and Mental Health Research, University of Newcastle, Newcastle, NSW, Australia [3] Hunter Medical Research Institute, Newcastle, NSW, Australia.
authors: E M
authors: EM
authors: Levi
authors: 1] Neurobiology of Addiction Laboratory, School of Biomedical Sciences and Pharmacy, University of Newcastle, Newcastle, NSW, Australia [2] The Centre for Translational Neuroscience and Mental Health Research, University of Newcastle, Newcastle, NSW, Australia [3] Hunter Medical Research Institute, Newcastle, NSW, Australia.
authors: P W
authors: PW
authors: Dickson
authors: 1] Neurobiology of Addiction Laboratory, School of Biomedical Sciences and Pharmacy, University of Newcastle, Newcastle, NSW, Australia [2] The Centre for Translational Neuroscience and Mental Health Research, University of Newcastle, Newcastle, NSW, Australia [3] Hunter Medical Research Institute, Newcastle, NSW, Australia.
authors: D W
authors: DW
authors: Smith
authors: 1] Neurobiology of Addiction Laboratory, School of Biomedical Sciences and Pharmacy, University of Newcastle, Newcastle, NSW, Australia [2] The Centre for Translational Neuroscience and Mental Health Research, University of Newcastle, Newcastle, NSW, Australia [3] Hunter Medical Research Institute, Newcastle, NSW, Australia.
authors: M J
authors: MJ
authors: Cairns
authors: 1] Neurobiology of Addiction Laboratory, School of Biomedical Sciences and Pharmacy, University of Newcastle, Newcastle, NSW, Australia [2] The Centre for Translational Neuroscience and Mental Health Research, University of Newcastle, Newcastle, NSW, Australia [3] Hunter Medical Research Institute, Newcastle, NSW, Australia.
authors: C V
authors: CV
authors: Dayas
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D019970:Cocaine-Related Disorders / Q000235:genetics*; D003342:Corpus Striatum; D003598:Cytoskeletal Proteins / Q000235:genetics* / Q000378:metabolism; D004195:Disease Models, Animal; D058999:Drug-Seeking Behavior; D020869:Gene Expression Profiling; D035683:MicroRNAs / Q000235:genetics*; D017072:Neostriatum; D009419:Nerve Tissue Proteins / Q000235:genetics* / Q000378:metabolism; D009473:Neuronal Plasticity / Q000235:genetics*; D012333:RNA, Messenger / Q000378:metabolism*; D051381:Rats
chemical_list: D003598:Cytoskeletal Proteins; C552427:MIRN212 microRNA, rat; D035683:MicroRNAs; D009419:Nerve Tissue Proteins; D012333:RNA, Messenger; C092069:activity regulated cytoskeletal-associated protein
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