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Pluralistic roles for glycogen in the central and peripheral nervous systems

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Abstract

Glycogen is present in the mammalian nervous system, but at concentrations of up to one hundred times lower than those found in liver and skeletal muscle. This relatively low concentration has resulted in neglect of assigning a role(s) for brain glycogen, but in the last 15 years enormous progress has been made in revealing the multifaceted roles that glycogen plays in the mammalian nervous system. Initial studies highlighted a role for glycogen in supporting neural elements (neurons and axons) during aglycemia, where glycogen supplied supplementary energy substrate in the form of lactate to fuel neural oxidative metabolism. The appropriate enzymes and membrane bound transporters have been localized to cellular locations consistent with astrocyte to neuron energy substrate shuttling. A role for glycogen in supporting the induction of long term potential (LTP) in the hippocampus has recently been described, where glycogen is metabolized to lactate and shuttled to neurons via the extracellular space by monocarboxylate transporters, where it plays an integral role in the induction process of LTP. This is the first time that glycogen has been assigned a role in a distinct, complex physiological brain function, where the lack of glycogen, in the presence of normoglycemia, results in disturbance of the function. The signalling pathway that alerts astrocytes to increased neuronal activity has been recently described, highlighting a pivotal role for increased extracellular potassium ([K+]o) that routinely accompanies increased neural activity. An astrocyte membrane bound bicarbonate transporter is activated by the [K+]o, the resulting increase in intracellular bicarbonate alkalizing the cell’s interior and activating soluble adenyl cyclase (sAC). The sAC promotes glycogenolysis via increases in cyclic AMP, ultimately producing lactate, which is shuttled out of the astrocyte and presumably taken up by neurons from the extracellular space.

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Authors and Affiliations

  1. School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, UK

    Kirsty L. Fryer & Angus M. Brown

  2. Department of Neurology, University of Washington, Seattle, WA, 98195, USA

    Angus M. Brown

  3. School of Life Sciences, Queens Medical Centre, University of Nottingham, Nottingham, NG7 2UH, UK

    Angus M. Brown

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  1. Kirsty L. Fryer
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  2. Angus M. Brown
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Correspondence to Angus M. Brown.

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Fryer, K.L., Brown, A.M. Pluralistic roles for glycogen in the central and peripheral nervous systems. Metab Brain Dis 30, 299–306 (2015). https://doi.org/10.1007/s11011-014-9516-5

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