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Related Concept Videos

Feedback Regulation of Calcium Concentration01:27

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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.
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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Updated: Nov 8, 2025

Simultaneous Measurement of Mitochondrial Calcium and Mitochondrial Membrane Potential in Live Cells by Fluorescent Microscopy
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Mitochondrial calcium at the synapse.

Sayantan Datta1, Manish Jaiswal1

  • 1Tata Institute of Fundamental Research, Hyderabad, India.

Mitochondrion
|April 25, 2021
PubMed
Summary
This summary is machine-generated.

Mitochondria regulate synaptic calcium, impacting neuronal energy production and preventing excitotoxicity. This review explores mitochondrial calcium

Keywords:
LETM1MCUMitochondrial calcium EffluxMitochondrial calcium influxNCLXSynaptic calciumVDAC

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Mitochondrial Biology

Background:

  • Mitochondria are vital organelles involved in energy production, ion buffering, and signaling.
  • Neurons have high metabolic demands, making mitochondria crucial for their function.
  • Mitochondrial dynamics and function are closely linked to synaptic activity and calcium levels.

Purpose of the Study:

  • To review the multifaceted roles of mitochondrial calcium at neuronal synapses.
  • To highlight how synaptic calcium influences mitochondrial calcium uptake and function.
  • To discuss the implications of mitochondrial calcium buffering for neurotransmission and neuronal health.

Main Methods:

  • This is a review article, synthesizing existing research.
  • Literature search and analysis of studies on mitochondrial calcium and synaptic function.
  • Integration of findings on ATP production, calcium buffering, and mitochondrial dynamics.

Main Results:

  • Synaptic calcium influx triggers mitochondrial calcium uptake, boosting ATP production.
  • Mitochondrial calcium buffering is essential for preventing excitotoxicity and ensuring proper neurotransmission.
  • Mitochondrial calcium levels regulate mitochondrial mobility, causing them to accumulate at active synapses.

Conclusions:

  • Mitochondrial calcium plays a critical regulatory role at the synapse.
  • It is integral to neuronal energy homeostasis, synaptic transmission fidelity, and neuroprotection.
  • Understanding these roles is key to comprehending neuronal function and dysfunction.