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Gadolinium (Gd3+) competes with calcium, disrupting synaptic transmission. This study reveals Gd3+ reduces calcium influx, impacting neurotransmitter release and potentially affecting brain function.

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Area of Science:

  • Neuroscience
  • Biophysics
  • Pharmacology

Background:

  • Gadolinium (Gd3+) is a lanthanide used as an MRI contrast agent.
  • Concerns exist regarding Gd3+ deposition in the body after multiple administrations.
  • The precise mechanism by which Gd3+ affects synaptic calcium channels remains unclear.

Purpose of the Study:

  • To investigate the mechanism of calcium influx into the presynaptic terminal.
  • To elucidate the effect of Gd3+ on neurotransmitter release into the synaptic cleft.

Main Methods:

  • Utilized Monte Carlo Cell simulation for data analysis.
  • Employed Blender software for 3D modeling and visualization of a spherical synapse.

Main Results:

  • Gd3+ interferes with calcium diffusion into the presynaptic terminal.
  • A decrease in presynaptic calcium influx was observed in the presence of Gd3+.
  • This reduction led to diminished active membrane establishment, synaptic vesicle docking, and neurotransmitter release.

Conclusions:

  • Gadolinium and calcium ions compete for calcium channels at the synapse.
  • Gd3+ presence triggers a cascade effect, impairing chemical synapse signal transmission.
  • The study highlights reduced active membrane, synaptic vesicle docking, and neurotransmitter release due to Gd3+ exposure.