title: Activity-associated miRNA are packaged in Map1b-enriched exosomes released from depolarized neurons.
abstract: Rapid input-restricted change in gene expression is an important aspect of synaptic plasticity requiring complex mechanisms of post-transcriptional mRNA trafficking and regulation. Small non-coding miRNA are uniquely poised to support these functions by providing a nucleic-acid-based specificity component for universal-sequence-dependent RNA binding complexes. We investigated the subcellular distribution of these molecules in resting and potassium chloride depolarized human neuroblasts, and found both selective enrichment and depletion in neurites. Depolarization was associated with a neurite-restricted decrease in miRNA expression; a subset of these molecules was recovered from the depolarization medium in nuclease resistant extracellular exosomes. These vesicles were enriched with primate specific miRNA and the synaptic-plasticity-associated protein MAP1b. These findings further support a role for miRNA as neural plasticity regulators, as they are compartmentalized in neurons and undergo activity-associated redistribution or release into the extracellular matrix.
authors: School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW 2308, Australia Schizophrenia Research Institute, Sydney, Australia Centre for Translational Neuroscience and Mental Health, Hunter Medical Research Institute, University of Newcastle, Callaghan, NSW 2308, Australia.
authors: Belinda J
authors: BJ
authors: Goldie
authors: School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW 2308, Australia Hunter Cancer Research Alliance, Hunter Medical Research Institute, University of Newcastle, Callaghan, NSW, 2308, Australia.
authors: Matthew D
authors: MD
authors: Dun
authors: School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia.
authors: Minjie
authors: M
authors: Lin
authors: ABRF, Research Services, University of Newcastle, Callaghan, NSW 2308, Australia.
authors: Nathan D
authors: ND
authors: Smith
authors: School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW 2308, Australia Hunter Cancer Research Alliance, Hunter Medical Research Institute, University of Newcastle, Callaghan, NSW, 2308, Australia.
authors: Nicole M
authors: NM
authors: Verrills
authors: School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW 2308, Australia Centre for Translational Neuroscience and Mental Health, Hunter Medical Research Institute, University of Newcastle, Callaghan, NSW 2308, Australia.
authors: Christopher V
authors: CV
authors: Dayas
authors: School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW 2308, Australia Schizophrenia Research Institute, Sydney, Australia Centre for Translational Neuroscience and Mental Health, Hunter Medical Research Institute, University of Newcastle, Callaghan, NSW 2308, Australia murray.cairns@newcastle.edu.au.
authors: Murray J
authors: MJ
authors: Cairns
mesh_terms: D045744:Cell Line, Tumor; D015536:Down-Regulation; D055354:Exosomes / Q000737:chemistry / Q000378:metabolism*; D006801:Humans; D035683:MicroRNAs / Q000032:analysis / Q000378:metabolism*; D008869:Microtubule-Associated Proteins / Q000032:analysis; D009419:Nerve Tissue Proteins / Q000032:analysis; D016501:Neurites / Q000737:chemistry / Q000378:metabolism; D009474:Neurons / Q000378:metabolism* / Q000502:physiology; D014176:Protein Biosynthesis; D020543:Proteome / Q000737:chemistry; D012333:RNA, Messenger / Q000378:metabolism; D015398:Signal Transduction; D014158:Transcription, Genetic
chemical_list: D035683:MicroRNAs; D008869:Microtubule-Associated Proteins; D009419:Nerve Tissue Proteins; D020543:Proteome; D012333:RNA, Messenger; C085284:microtubule-associated protein 1B