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Related Concept Videos

Feedback Regulation of Calcium Concentration01:27

Feedback Regulation of Calcium Concentration

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...
Mitochondrial Membranes01:45

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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,...
Mitochondrial Membranes01:45

Mitochondrial Membranes

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,...
The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
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Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

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Related Experiment Video

Updated: Jun 13, 2026

Analyses of Mitochondrial Calcium Influx in Isolated Mitochondria and Cultured Cells
08:29

Analyses of Mitochondrial Calcium Influx in Isolated Mitochondria and Cultured Cells

Published on: April 27, 2018

Mitochondrial calcium channels.

Uta C Hoppe1

  • 1Department of Internal Medicine III, University of Cologne, Cologne, Germany. uta.hoppe@uni-koeln.de

FEBS Letters
|April 15, 2010
PubMed
Summary
This summary is machine-generated.

Mitochondrial calcium (Ca2+) transport is crucial for cell energy and signaling. While key transporters like the mitochondrial calcium uniporter (MCU) are known, the exact roles and structures of all mitochondrial Ca2+ channels require further investigation.

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Multi-parameter Measurement of the Permeability Transition Pore Opening in Isolated Mouse Heart Mitochondria
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Multi-parameter Measurement of the Permeability Transition Pore Opening in Isolated Mouse Heart Mitochondria

Published on: September 7, 2012

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Last Updated: Jun 13, 2026

Analyses of Mitochondrial Calcium Influx in Isolated Mitochondria and Cultured Cells
08:29

Analyses of Mitochondrial Calcium Influx in Isolated Mitochondria and Cultured Cells

Published on: April 27, 2018

Simultaneous Measurement of Mitochondrial Calcium and Mitochondrial Membrane Potential in Live Cells by Fluorescent Microscopy
08:43

Simultaneous Measurement of Mitochondrial Calcium and Mitochondrial Membrane Potential in Live Cells by Fluorescent Microscopy

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Multi-parameter Measurement of the Permeability Transition Pore Opening in Isolated Mouse Heart Mitochondria
13:42

Multi-parameter Measurement of the Permeability Transition Pore Opening in Isolated Mouse Heart Mitochondria

Published on: September 7, 2012

Area of Science:

  • Cellular Biology
  • Mitochondrial Physiology
  • Ion Transport

Background:

  • Mitochondrial calcium (Ca2+) handling is vital for cellular energy production and signaling pathways.
  • Calcium uptake is primarily mediated by the mitochondrial calcium uniporter (MCU), alongside other channels.
  • Calcium efflux occurs via Na+-dependent (mNCX) and Na+-independent mechanisms.

Purpose of the Study:

  • To review recent advancements in understanding mitochondrial Ca2+ transport.
  • To highlight the known and unknown aspects of mitochondrial Ca2+ channels and transporters.
  • To emphasize the need for further research into their physiological roles and molecular structures.

Main Methods:

  • Literature review of recent studies on mitochondrial Ca2+ transport.
  • Analysis of known molecular components involved in mitochondrial Ca2+ uptake and efflux.
  • Synthesis of current knowledge regarding the regulation and function of these transporters.

Main Results:

  • Significant progress has been made in elucidating the regulation and function of mitochondrial Ca2+ transport mechanisms.
  • The mitochondrial calcium uniporter (MCU) is a key player in Ca2+ uptake.
  • Both Na+-dependent and Na+-independent pathways contribute to mitochondrial Ca2+ efflux.

Conclusions:

  • Despite recent insights, the precise physiological functions of all mitochondrial Ca2+ transporters remain incompletely defined.
  • The molecular structures of various mitochondrial Ca2+ channels and transporters require further elucidation.
  • Continued research is essential to fully understand mitochondrial Ca2+ homeostasis and its implications.