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Related Concept Videos

Feedback Regulation of Calcium Concentration01:27

Feedback Regulation of Calcium Concentration

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Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
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Updated: Apr 16, 2026

Registration of Calcium Transients in Mouse Neuromuscular Junction with High Temporal Resolution using Confocal Microscopy
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Calcium: amplitude, duration, or location?

R C Evans1, K T Blackwell2

  • 1George Mason University, The Krasnow Institute for Advanced Studies, MS 2A1, Fairfax, Virginia 22030-444.

The Biological Bulletin
|March 7, 2015
PubMed
Summary
This summary is machine-generated.

Calcium concentration, duration, and location influence synaptic plasticity. This review examines evidence for these factors in long-term potentiation (LTP) and long-term depression (LTD), advocating for a renewed focus on calcium influx location.

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Computational Biology

Background:

  • Calcium ions are critical mediators of synaptic plasticity, influencing both the strengthening (long-term potentiation, LTP) and weakening (long-term depression, LTD) of synapses.
  • The opposing effects of calcium on synaptic plasticity have led to several hypotheses regarding its role, primarily categorized by concentration amplitude, elevation duration, and influx location.

Purpose of the Study:

  • To review the experimental evidence supporting and refuting existing hypotheses on how calcium triggers distinct synaptic plasticity outcomes (LTP vs. LTD).
  • To evaluate recent computational models that incorporate these hypotheses.
  • To propose a renewed focus on the location of calcium influx as a key determinant of synaptic plasticity.

Main Methods:

  • Literature review of experimental studies investigating the role of calcium in synaptic plasticity.
  • Analysis of computational models simulating calcium dynamics and synaptic plasticity.
  • Synthesis of evidence for and against hypotheses based on calcium concentration, duration, and location.

Main Results:

  • Existing hypotheses regarding calcium's role in LTP/LTD are based on concentration, duration, or location.
  • Computational models have been developed to explore these different hypotheses.
  • Experimental evidence for each hypothesis varies, with ongoing debate.

Conclusions:

  • The precise mechanisms by which calcium triggers opposing forms of synaptic plasticity (LTP/LTD) remain incompletely understood.
  • Advances in calcium imaging and computational modeling provide new tools to re-evaluate these mechanisms.
  • The location of calcium influx warrants further investigation as a critical factor in determining synaptic plasticity outcomes.