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- W4387492806 abstract "In the brain microRNAs (miRNAs) are believed to play a role in orchestrating synaptic plasticity at a higher-level by acting as an additional mechanism of translational regulation, alongside the mRNAs/polysome system. Despite extensive research, our understanding of the specific contribution of individual miRNA to the function of dopaminergic neurons (DAn) remains limited. By performing a dopaminergic-specific miRNA screening, we have identified miR-218 as a critical regulator of DAn activity in male and female mice. We have found that miR-218 is specifically expressed in mesencephalic DAn and is able to promote dopaminergic differentiation of embryonic stem cells and functional maturation of transdifferentiated induced DA neurons. Midbrain-specific deletion of both genes encoding for miR-218 (referred to as miR-218-1 and mir218-2) affects the expression of a cluster of synaptic-related mRNAs and alters the intrinsic excitability of DAn, as it increases instantaneous frequencies of evoked action potentials, reduces rheobase current, affects the ionic current underlying the action potential after hyperpolarization phase and reduces dopamine efflux in response to a single electrical stimulus. Our findings provide a comprehensive understanding of the involvement of miR-218 in the dopaminergic system and highlight its role as a modulator of dopaminergic transmission.Significance StatementIn the past decade several miRNAs have emerged as potential regulators of synapse activity through the modulation of specific genes expression. Among these, we have identified a dopaminergic-specific miRNA, miR-218, which is able to promote dopaminergic differentiation and regulates the translation of an entire cluster of synapse related mRNAs. Deletion of miR-218 has notable effects on dopamine release and alters the intrinsic excitability of dopaminergic neurons indicating a direct control of dopaminergic activity by miR-218." @default.
- W4387492806 created "2023-10-11" @default.
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- W4387492806 date "2023-10-10" @default.
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- W4387492806 title "miR-218 promotes dopaminergic differentiation and controls neuron excitability and neurotransmitter release through the regulation of a synaptic-related genes network" @default.
- W4387492806 doi "https://doi.org/10.1523/jneurosci.0431-23.2023" @default.
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