Abstract:
:The brain relies on GABAergic neurons to control the ongoing activity of neuronal networks. GABAergic neurons control the firing pattern of excitatory cells, the temporal structure of membrane potential oscillations and the time window for integration of synaptic inputs. These actions require a fine control of the timing of GABA receptor activation which, in turn, depends on the precise timing of GABA release from pre-synaptic terminals and GABA clearance from the extracellular space. Extracellular GABA is not subject to enzymatic breakdown, and its clearance relies entirely on diffusion and uptake by specific transporters. In contrast to glutamate transporters, GABA transporters are abundantly expressed in neuronal pre-synaptic terminals. GABA transporters move laterally within the plasma membrane and are continuously trafficked to/from intracellular compartments. It is hypothesized that due to their proximity to GABA release sites, changes in the concentration and lateral mobility of GABA transporters may have a significant effect on the time course of the GABA concentration profile in and out of the synaptic cleft. To date, this hypothesis remains to be tested. Here we use 3D Monte Carlo reaction-diffusion simulations to analyze how changes in the density of expression and lateral mobility of GABA transporters in the cell membrane affect the extracellular GABA concentration profile and the activation of GABA receptors. Our results indicate that these manipulations mainly alter the GABA concentration profile away from the synaptic cleft. These findings provide novel insights into how the ability of GABA transporters to undergo plastic changes may alter the strength of GABAergic signals and the activity of neuronal networks in the brain.
journal_name
Front Cell Neuroscijournal_title
Frontiers in cellular neuroscienceauthors
Scimemi Adoi
10.3389/fncel.2014.00128subject
Has Abstractpub_date
2014-05-13 00:00:00pages
128issn
1662-5102journal_volume
8pub_type
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journal_title:Frontiers in cellular neuroscience
pub_type: 杂志文章,评审
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journal_title:Frontiers in cellular neuroscience
pub_type: 杂志文章
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abstract:BACKGROUND:Amyotrophic lateral sclerosis (ALS) is an incurable fatal motoneuron disease with a lifetime risk of approximately 1:400. It is characterized by progressive weakness, muscle wasting, and death ensuing 3-5 years after diagnosis. Granulocyte-colony stimulating factor (G-CSF) is a drug candidate for ALS, with e...
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pub_type: 杂志文章
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pub_type: 杂志文章,评审
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pub_type: 杂志文章
doi:10.3389/fncel.2018.00230
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pub_type: 杂志文章
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journal_title:Frontiers in cellular neuroscience
pub_type: 杂志文章
doi:10.3389/fncel.2020.00228
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abstract::[This corrects the article DOI: 10.3389/fncel.2017.00013.]. ...
journal_title:Frontiers in cellular neuroscience
pub_type: 已发布勘误
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journal_title:Frontiers in cellular neuroscience
pub_type: 杂志文章,评审
doi:10.3389/fncel.2013.00168
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journal_title:Frontiers in cellular neuroscience
pub_type: 杂志文章
doi:10.3389/fncel.2015.00442
更新日期:2015-11-12 00:00:00
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pub_type: 杂志文章,评审
doi:10.3389/fncel.2019.00383
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journal_title:Frontiers in cellular neuroscience
pub_type: 杂志文章
doi:10.3389/fncel.2015.00073
更新日期:2015-03-11 00:00:00
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pub_type: 杂志文章,评审
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章,评审
doi:10.3389/fncel.2018.00011
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