How and when to measure mitochondrial inner membrane potentials.

Area of Science:

• Biochemistry
• Cell Biology
• Pathology

Background:

• Mitochondria play critical roles in various diseases, including metabolic disorders, neurodegeneration, cardiovascular diseases, inflammation, and cancer.
• Research extensively investigates mitochondrial function, often employing fluorescent probes to measure inner mitochondrial membrane potential (ΔΨm).

Purpose of the Study:

• To provide a comprehensive overview of techniques for measuring mitochondrial pH (ΔpH) and ΔΨm.
• To highlight the advantages, limitations, and applications of these measurement techniques.
• To discuss the drawbacks of ΔΨm probes, particularly uncalibrated usage, and suggest alternative methods.

Main Methods:

• Review of existing scientific literature on mitochondrial function measurement techniques.
• Analysis of fluorescent probes for assessing ΔΨm and methods for measuring ΔpH.
• Discussion of calibration requirements and potential artifacts associated with ΔΨm probes.

Main Results:

• Fluorescent probes are commonly used to assess mitochondrial function, but their interpretation requires careful consideration of calibration and potential artifacts.
• Understanding the limitations of ΔΨm probes is crucial for accurate assessment of mitochondrial protonmotive force and oxidative phosphorylation.
• Alternative methods may be more suitable than ΔΨm probes under specific experimental conditions.

Conclusions:

• Accurate measurement of mitochondrial function is essential for advancing research in various pathological conditions.
• Researchers should be aware of the limitations of commonly used ΔΨm probes and consider alternative, more precise methods when necessary.
• Adopting artifact-free, sensitive, and quantitative measurements will significantly benefit studies on mitochondrial roles in health and disease.