What is the membrane potential of mitochondria?
The mitochondrial membrane potential (ΔΨm) generated by proton pumps (Complexes I, III and IV) is an essential component in the process of energy storage during oxidative phosphorylation. Together with the proton gradient (ΔpH), ΔΨm forms the transmembrane potential of hydrogen ions which is harnessed to make ATP.
What is the typical potential difference across a mitochondrial membrane?
Under normal conditions, cardiac myocytes typically exhibit a plasma membrane potential of –90 mV and a mitochondrial membrane potential of up to –150 mV.
What is TMRM bind?
As discussed in Results, TMRM, TMRE, and R123 were found to bind to mitochondria, causing an apparent deviation of the ΔΨ-dependent accumulation of these probes from that predicted by the Nernst equation.
Does JC 1 increase mitochondrial membrane potential?
mitochondrial membrane potential in human fibroblast cells was determined by JC-1. FCCP treated cells showed increased monomeric (green) signal which supported change of mitochondrial membrane potential compared to control cells.
What is mitochondrial membrane depolarization?
This mechanism consists of mild depolarization of the inner mitochondrial membrane to decrease the membrane potential to a level sufficient to form ATP but insufficient to generate mROS.
What is the mitochondrial membrane potential mV?
Mitochondrial membrane potential (ΔΨM) is a central intermediate in oxidative energy metabolism. In cultured rat cortical neurons, ΔΨM is −139 mV at rest, and is regulated between −108 mV and −158 mV by concerted increases in ATP demand and Ca2+-dependent metabolic activation.
What is electrical membrane potential?
Membrane potential (also transmembrane potential or membrane voltage) is the difference in electric potential between the interior and the exterior of a biological cell. Almost all plasma membranes have an electrical potential across them, with the inside usually negative with respect to the outside.
What is the difference between membrane potential and resting membrane potential?
If the membrane potential becomes more positive than it is at the resting potential, the membrane is said to be depolarized. If the membrane potential becomes more negative than it is at the resting potential, the membrane is said to be hyperpolarized.
What is TMRM staining?
TMRM staining is used to monitor mitochondrial function. When mitochondrial membrane potential collapses in apoptotic or metabolically stressed cells, the TMRM reagent is dispersed throughout the cell cytosol and fluorescence levels drop dramatically.
What does a decrease in mitochondrial membrane potential mean?
328,329 Loss of mitochondrial membrane potential is a signal of bioenergetic stress and may result in the release of apoptotic factors leading to cell death.