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Modulation of mitochondrial function by endogenous Zn2+ pools.

Stefano L Sensi1, Dien Ton-That, Patrick G Sullivan

  • 1Department of Neurology, University of California, Irvine 92697-4292, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 2, 2003
PubMed
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Intracellular zinc (Zn2+) accumulation contributes to neuronal injury. This study reveals a distinct mitochondrial zinc pool in neurons, separate from cytosolic stores, with implications for brain health.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Intracellular zinc (Zn2+) accumulation is implicated in neuronal injury during epilepsy and ischemia.
  • While synaptic zinc release is studied, intracellular zinc pools mobilized by stimulation are increasingly recognized.

Purpose of the Study:

  • To investigate the presence and characteristics of intracellular zinc pools in cultured cortical neurons.
  • To determine the functional effects of zinc mobilization on neuronal mitochondria.

Main Methods:

  • Utilized advanced imaging techniques to visualize intracellular zinc distribution.
  • Employed pharmacological agents to selectively mobilize distinct zinc pools.
  • Performed patch-clamp recordings on isolated brain mitochondria (mitoplasts).

Related Experiment Videos

  • Measured mitochondrial oxygen consumption and reactive oxygen species (ROS) generation.

    • Main Results:

    • Identified a novel mitochondrial zinc pool distinct from cytosolic protein-bound pools.
    • Demonstrated pharmacological independence of cytosolic and mitochondrial zinc mobilization, with inter-pool transfer observed.
    • Revealed complex effects of submicromolar zinc on mitochondria, including depolarization and altered oxygen consumption.
    • Observed that higher zinc levels increased ROS generation, while lower levels decreased it.
    • Showed that mobilization of protein-bound zinc can lead to partial mitochondrial depolarization.

    Conclusions:

    • A distinct mitochondrial zinc pool exists in neurons, separate from cytosolic pools.
    • Interplay between cytosolic and mitochondrial zinc pools may be functionally significant in neuronal processes.
    • Zinc's concentration-dependent effects on mitochondrial function highlight its critical role in neuronal health and disease.