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[Synaptic zinc in the central nervous system].

C López-García1, A Molowny, X Ponsoda

  • 1Unidad de Neurobiología Celular; Universidad de Valencia. Facultad de Biología, Burjasot, 46100, España.

Revista De Neurologia
|October 6, 2001
PubMed
Summary

Zinc, an abundant element in brain tissue, plays a dual role in neuronal function. While essential, excess synaptic zinc can be neurotoxic, potentially contributing to Alzheimer's disease pathogenesis.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Cell Biology

Context:

  • Zinc is the second most abundant trace element in the brain, crucial for nervous tissue function.
  • A small fraction of brain zinc exists as free ions within vesicles, particularly in synaptic vesicles.
  • This ionic zinc is released during synaptic transmission, termed synaptic zinc.

Purpose:

  • To elucidate the multifaceted role of zinc in neuronal function and its implications in neurodegenerative diseases.
  • To investigate the mechanisms of synaptic zinc release, its modulatory effects, and its potential neurotoxicity.
  • To explore the link between impaired zinc homeostasis and the etiology of Alzheimer's disease.

Summary:

  • Synaptic zinc modulates neuronal receptors and ion channels, but its prolonged extracellular presence can lead to postsynaptic neurotoxicity.

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  • Neurons and glial cells possess efficient mechanisms for clearing extracellular synaptic zinc, possibly alongside glutamate.
  • Dysfunctional zinc clearance may trigger compensatory responses, such as amyloid precursor protein precipitation, potentially exacerbating Alzheimer's disease factors.

    • Impact:

    • Understanding synaptic zinc dynamics is crucial for comprehending normal brain function and neuroprotection.
    • Identifying the role of zinc dyshomeostasis in neurodegeneration opens avenues for novel therapeutic strategies.
    • This research highlights the complex involvement of trace elements in neurological health and disease, particularly Alzheimer's disease.