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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
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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,...
Potentiometry: Overview01:06

Potentiometry: Overview

Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as the...
Energy to Drive Translocation01:37

Energy to Drive Translocation

Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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ATP Driven Pumps I: An Overview01:27

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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
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High-Resolution Fluorespirometry to Assess Dynamic Changes in Mitochondrial Membrane Potential in Human Immune Cells
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Mitochondrial membrane potential probes and the proton gradient: a practical usage guide.

Seth W Perry1, John P Norman, Justin Barbieri

  • 1Department of Biomedical Engineering, University of Rochester School of Medicine and Dentistry, Rochester, NY 14627, USA. seth_perry@urmc.rochester.edu

Biotechniques
|April 14, 2011
PubMed
Summary
This summary is machine-generated.

This review guides researchers on using fluorescent probes to monitor mitochondrial membrane potential. It highlights critical controls and complementary assays for accurate interpretation of mitochondrial function in cell fate studies.

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Area of Science:

  • Biomedical Research
  • Cell Biology
  • Biophysics

Background:

  • Fluorescent probes are vital for assessing mitochondrial membrane potential and function.
  • Accurate interpretation requires understanding probe behavior and potential confounding factors.
  • Mitochondrial function is crucial for cell fate determination.

Purpose of the Study:

  • To provide a practical guide for using cationic fluorescent probes to monitor mitochondrial membrane potential.
  • To outline essential technical considerations and controls for reliable results.
  • To highlight the strengths and limitations of common mitochondrial membrane potential dyes.

Main Methods:

  • Review of existing literature on fluorescent probes for mitochondrial membrane potential.
  • Discussion of technical considerations, including non-protonic charge effects.
  • Emphasis on necessary experimental controls and complementary assays.

Main Results:

  • Identified key factors influencing fluorescent probe behavior and signal interpretation.
  • Outlined a framework for implementing appropriate controls and complementary assays.
  • Illustrated potential pitfalls and best practices for dye application.

Conclusions:

  • Careful consideration of technical aspects and controls is essential for accurate mitochondrial membrane potential assessment.
  • This review offers best-usage approaches for efficacious application of mitochondrial dyes in life sciences.
  • Proper methodology ensures reliable data for cell fate and mitochondrial function studies.