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Updated: Apr 11, 2026

Assessment of Myofilament Ca2+ Sensitivity Underlying Cardiac Excitation-contraction Coupling
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Reduced endogenous Ca2+ buffering speeds active zone Ca2+ signaling.

Igor Delvendahl1, Lukasz Jablonski2, Carolin Baade2

  • 1Carl-Ludwig-Institute for Physiology, Medical Faculty, University of Leipzig, 04103 Leipzig, Germany; igor.delvendahl@medizin.uni-leipzig.de eneher@gwdg.de hallermann@medizin.uni-leipzig.de.

Proceedings of the National Academy of Sciences of the United States of America
|May 28, 2015
PubMed
Summary

Reduced calcium buffering in nerve terminals allows for sustained, fast neurotransmitter release during high-frequency firing. This finding reveals how synaptic transmission rates are regulated by calcium dynamics.

Keywords:
active zonecalcium bufferscalcium signalingneurotransmitter releasepresynaptic

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Biophysics

Background:

  • Fast neurotransmitter release relies on localized calcium (Ca2+) signals at the presynaptic active zone.
  • Endogenous Ca2+ buffers typically limit the spatiotemporal spread of these signals.
  • Sustaining rapid Ca2+ signaling during repetitive neuronal firing remains poorly understood.

Purpose of the Study:

  • To investigate the role of endogenous Ca2+ buffers in maintaining rapid Ca2+ signaling during high-frequency neurotransmission.
  • To understand the mechanisms enabling sustained synchronous release at the presynaptic active zone.

Main Methods:

  • Quantitative two-photon Ca2+ imaging in cerebellar mossy fiber boutons firing at high rates.
  • Experimentally constrained computational modeling of Ca2+ dynamics.
  • Ultra-high-resolution measurement of Ca2+ signals at varying distances from active zones.

Main Results:

  • Endogenous fixed Ca2+ buffers exhibit low Ca2+ binding ratios and low affinity.
  • Mobile buffers demonstrate high affinity for Ca2+.
  • Low endogenous buffering facilitates rapid Ca2+ clearance from the active zone during repetitive firing, consistent with model predictions.

Conclusions:

  • Reduced Ca2+ buffering is crucial for enabling fast active zone Ca2+ signaling.
  • The strength of endogenous Ca2+ buffering directly limits the rate of synchronous synaptic transmission.
  • This provides a novel mechanism for regulating synaptic efficacy.