Related Experiment Video
Updated: May 1, 2026
08:29
Analyses of Mitochondrial Calcium Influx in Isolated Mitochondria and Cultured Cells
Published on: April 27, 2018
13.6K
How does calcium regulate mitochondrial energetics in the heart? - new insights
Helena M Viola1, Livia C Hool1
1School of Anatomy, Physiology and Human Biology, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia.
Heart, Lung & Circulation
|March 25, 2014
Summary
Calcium and cytoskeleton regulate mitochondrial function in heart cells. L-type calcium channels control calcium entry, impacting ATP production and contraction for energy demands.
Area of Science:
- Cardiovascular Physiology
- Mitochondrial Biology
- Cellular Signaling
Background:
- Cellular calcium homeostasis is vital for mitochondrial ATP production and cardiac contraction.
- L-type calcium channels are the primary pathway for calcium influx into cardiac myocytes.
- Cytoskeletal proteins link plasma membrane signals to intracellular organelles like mitochondria.
Purpose of the Study:
- To explore the roles of calcium and the cytoskeleton in regulating mitochondrial function.
- To investigate the impact of altered L-type calcium channel activity on mitochondrial processes.
- To understand the functional coupling between L-type calcium channels and mitochondria.
Main Methods:
- The study reviews existing literature on L-type calcium channel activity and its effects.
- It examines the influence of calcium and cytoskeletal interactions on mitochondrial function.
- Analysis focuses on signal transduction from the plasma membrane to mitochondria.
Main Results:
- Direct activation of L-type calcium channels increases intracellular and mitochondrial calcium.
- This leads to elevated mitochondrial NADH production, oxygen consumption, and reactive oxygen species.
- The L-type calcium channel regulates mitochondrial membrane potential via cytoskeletal proteins.
Conclusions:
- A functional coupling exists between L-type calcium channels and mitochondria via the cytoskeleton.
- This coupling synchronizes mitochondrial function with calcium influx to meet energy demands.
- This mechanism supports beat-to-beat regulation of myocardial energy production.
Related Concept Videos
01:45Mitochondrial Membranes
11.7K
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,...
11.7K
01:28The Inner Mitochondrial Membrane
3.8K
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...
3.8K
01:37Mitochondria
13.4K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
13.4K
01:27Feedback Regulation of Calcium Concentration
2.9K
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...
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
2.9K
01:46Electron Transport Chain: Complex I and II
11.9K
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...
ROS generation is regulated and maintained at moderate levels necessary...
11.9K