Simple, reliable, and time-efficient colorimetric method for the assessment of mitochondrial function and toxicity

Area of Science:

• Cell Biology
• Biochemistry
• Biomedical Research

Background:

• Mitochondria are vital organelles for cellular energy production and signaling.
• Mitochondrial dysfunction is linked to diseases like metabolic disorders, neurodegeneration, and cancer.
• Accurate assessment of mitochondrial function is crucial for understanding health and disease.

Purpose of the Study:

• To develop a simple, cost-efficient, and time-saving colorimetric assay for assessing mitochondrial function.
• To establish Janus green B (JG-B) reduction as a reliable indicator of mitochondrial activity and toxicity.

Main Methods:

• Utilized Janus green B (JG-B), a lipophilic cationic dye, as the basis for a colorimetric assay.
• Monitored the reduction of JG-B by mitochondrial dehydrogenases to diethylsafranine (pink color, max absorption at 550 nm).
• Applied the assay to in vitro mitochondrial preparations isolated from rat brain.

Main Results:

• Demonstrated that JG-B conversion to diethylsafranine is a robust indicator of mitochondrial activity.
• Showcased the assay's ability to reliably detect mitochondrial toxicity.
• Validated the assay's effectiveness in proof-of-principle studies with isolated mitochondria.

Conclusions:

• The JG-B-based colorimetric assay provides a simple, efficient, and cost-effective method for evaluating mitochondrial function.
• This assay has broad potential applications in analytical and therapeutic biomedical research.
• The assay serves as a reliable tool for assessing mitochondrial activity and toxicity.