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Related Concept Videos

Cellular Injury IV: Necrosis01:16

Cellular Injury IV: Necrosis

Necrosis is a form of irreversible cell death caused by severe injury such as ischemia, toxins, or trauma. Unlike programmed cell death, it is an uncontrolled, pathological process that typically provokes inflammation in surrounding tissues.Pathophysiologic ChangesNecrosis begins when cells sustain critical damage, leading to swelling of organelles, particularly mitochondria, and rapid ATP depletion. As energy levels decline, membrane ion pumps fail, leading to calcium influx and eventually,...
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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
Overview of Cell Death01:30

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Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

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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Related Experiment Video

Updated: Jul 6, 2026

Monitoring Dynamic Changes In Mitochondrial Calcium Levels During Apoptosis Using A Genetically Encoded Calcium Sensor
06:26

Monitoring Dynamic Changes In Mitochondrial Calcium Levels During Apoptosis Using A Genetically Encoded Calcium Sensor

Published on: April 1, 2011

Ca2+ signaling, mitochondria and cell death.

Carlotta Giorgi1, Anna Romagnoli, Paolo Pinton

  • 1Department of Experimental and Diagnostic Medicine, Section of General Pathology, Via Borsari 46, 44100 Ferrara, Italy.

Current Molecular Medicine
|March 14, 2008
PubMed
Summary

Calcium ions (Ca2+) are crucial regulators of cell death pathways, including apoptosis, necrosis, and autophagy. This review explores how calcium signaling influences mitochondria and controls cell fate decisions.

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Last Updated: Jul 6, 2026

Monitoring Dynamic Changes In Mitochondrial Calcium Levels During Apoptosis Using A Genetically Encoded Calcium Sensor
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05:53

Mitochondrial Ca2+ Retention Capacity Assay and Ca2+-triggered Mitochondrial Swelling Assay

Published on: May 1, 2018

Area of Science:

  • Cell Biology
  • Biochemistry
  • Physiology

Background:

  • Cytosolic calcium ions (Ca2+) are vital for eukaryotic cell function, regulating processes like muscle contraction and secretion.
  • Tight control of intracellular Ca2+ levels is maintained by transporters, pumps, channels, and binding proteins.
  • Disruptions in calcium handling can lead to cell death, highlighting its critical role in cellular homeostasis.

Purpose of the Study:

  • To review the involvement of calcium (Ca2+) in the three major cell death processes: apoptosis, necrosis, and autophagy.
  • To elucidate the complex signaling interplay through which Ca2+ signals are decoded into mitochondrial messages that control cell fate.

Main Methods:

  • Literature review of existing research on calcium signaling and cell death.
  • Analysis of the role of Ca2+ in apoptosis, necrosis, and autophagy.
  • Examination of Ca2+ interactions with mitochondria in cell death pathways.

Main Results:

  • Calcium ions (Ca2+) play a significant role in the activation of apoptosis, necrosis, and autophagy.
  • Changes in cytosolic Ca2+ concentration ([Ca2+]c) modulate cellular functions and influence cell death.
  • Ca2+ signals impact critical cell death checkpoints, particularly mitochondria, affecting cellular sensitivity to various challenges.

Conclusions:

  • Calcium signaling is a key determinant of cell fate, influencing the balance between cell survival and death.
  • Mitochondria act as central integrators of Ca2+ signals, translating them into specific cell death outcomes.
  • Understanding Ca2+ dynamics is essential for comprehending the mechanisms of cell death and developing therapeutic strategies.