Neuronal Activity Induces Synaptic Delivery of hnRNP A2/B1 by a BDNF-Dependent Mechanism in Cultured Hippocampal Neurons
Autor: | Carlos B. Duarte, Graciano Leal, Pedro M. Afonso |
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Rok vydání: | 2014 |
Předmět: |
Transmembrane Receptors
lcsh:Medicine Tropomyosin receptor kinase B Bioinformatics Hippocampus Biochemistry Synapse Neurotrophic factors Heterogeneous-Nuclear Ribonucleoprotein Group A-B Animals Premovement neuronal activity RNA Messenger lcsh:Science Cells Cultured Ribonucleoprotein Neurons Multidisciplinary biology Brain-Derived Neurotrophic Factor lcsh:R Intracellular Signaling Peptides and Proteins Membrane Proteins Biology and Life Sciences Proteins Neurochemistry Long-term potentiation Dendrites Neurotransmitters Cell Biology Rats Up-Regulation Cell biology nervous system Polyribosomes Cellular Neuroscience Synapses Synaptic plasticity biology.protein lcsh:Q Disks Large Homolog 4 Protein Research Article Signal Transduction Neuroscience Synaptic Plasticity Neurotrophin |
Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP PLoS ONE, Vol 9, Iss 10, p e108175 (2014) PLoS ONE |
ISSN: | 1932-6203 |
Popis: | Dendritic protein synthesis plays a critical role in several forms of synaptic plasticity, including BDNF (brain-derived neurotrophic factor)-mediated long-term synaptic potentiation (LTP). Dendritic transcripts are typically transported in a repressed state as components of large ribonucleoprotein complexes, and then translated upon stimulation at, or in the vicinity, of activated synapses. Heterogeneous nuclear ribonucleoprotein A2/B1 (hnRNP A2/B1) is a trans-acting factor involved in dendritic mRNA trafficking, but how the distribution of the protein in dendrites is regulated has not been characterized. Here we found that a fraction of hnRNP A2/B1 is present at the synapse under resting conditions in cultured hippocampal neurons. Accordingly, this ribonucleoprotein was detected in free mRNP, monosomal, and polyribosomal fractions obtained from synaptoneurosomes. Neuronal activity and BDNF treatment increased hnRNP A2/B1 protein levels in the cell body and dendritic compartments, and induced the delivery of this protein to synaptic sites. The activity-dependent accumulation of hnRNP A2/B1 at the synapse required, at least in part, the activation of TrkB receptors, presumably by BDNF. This neurotrophin also upregulated the hnRNP A2/B1 mRNA in the soma but was without effect on the abundance of neuritic hnRNP A2/B1 transcripts. These results show that the distribution of hnRNP A2/B1 is regulated by BDNF and by neuronal activity, an effect that may have a role in BDNF-induced synaptic plasticity events. |
Databáze: | OpenAIRE |
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