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The mitochondrial membrane potential (ΔΨm) is generated by the electrochemical proton gradient across the inner mitochondrial membrane and is essential for oxidative phosphorylation, ATP production, and overall cellular energy metabolism. Maintenance of ΔΨm reflects mitochondrial integrity and function, whereas its dissipation is a hallmark of mitochondrial dysfunction.
A decrease in ΔΨm is one of the earliest biochemical events during apoptosis and typically precedes cytochrome c release, caspase activation, and irreversible cell death. Therefore, ΔΨm is widely used as a sensitive and early indicator for mitochondrial damage, apoptosis initiation, oxidative stress, and drug-induced cytotoxicity.
JC-1 (5,5',6,6'-tetrachloro-1,1',3,3'-tetraethylbenzimidazolylcarbocyanine iodide) is a lipophilic cationic fluorescent dye that selectively accumulates in mitochondria in a membrane potential–dependent manner:
• High ΔΨm: JC-1 aggregates in the mitochondrial matrix, forming J-aggregates that emit red fluorescence
• Low ΔΨm: JC-1 remains in its monomeric form, emitting green fluorescence
By measuring the relative intensity of red and green fluorescence, changes in mitochondrial membrane potential can be assessed qualitatively or semi-quantitatively. This method is compatible with both flow cytometry and fluorescence microscopy and can be applied to adherent or suspension cells.
Cell culture → Drug treatment → JC-1 staining → Washing →Flow cytometry analysis / Fluorescence microscopy imaging → Data analysis
• JC-1 fluorescent dye (≥98% purity)
• Dimethyl sulfoxide (DMSO)
• Phosphate-buffered saline (PBS, pH 7.2–7.4)
• Serum-free culture medium
• CCCP (Carbonyl cyanide m-chlorophenyl hydrazone)
• 6-well tissue culture plates
• Flow cytometer (FITC and PE channels) or fluorescence microscope (FITC/TRITC filters)
Cell Culture
Experimental Treatment
After cells reach the appropriate confluence, treat them with the test compounds or experimental conditions according to the experimental design. Incubate the cells for the required duration before proceeding to JC-1 staining.
Control Groups
Negative control: untreated cells maintained under the same culture conditions.
Positive control: cells treated with 50 μM CCCP at 37°C for 20 minutes. CCCP acts as a mitochondrial uncoupler and is used to completely dissipate the mitochondrial membrane potential (ΔΨm), serving as a validation control for the assay.
A decrease in the red/green fluorescence intensity ratio indicates a reduction in mitochondrial membrane potential, which is commonly associated with early apoptosis or mitochondrial dysfunction.
A. Flow Cytometry Analysis
B. Fluorescence Microscopy Observation
• Normal mitochondrial membrane potential: dominant red fluorescence (JC-1 aggregates, emission ≈590 nm)
• Depolarized mitochondria: increased green fluorescence (JC-1 monomers, emission ≈529 nm)
Images are acquired using FITC and TRITC dual-channel settings.
Flow Cytometry Data (FlowJo)
Gating strategy
Fluorescence quantification
Interpretation
Microscopy Image Analysis (ImageJ)
• JC-1 is light-sensitive; all staining procedures should be performed in the dark
• Optimal JC-1 concentration may vary among cell types; preliminary optimization is recommended
• Excessive dye loading or poor cell viability may interfere with fluorescence ratio interpretation
• Inclusion of CCCP-treated positive controls is strongly recommended for assay validation
The excitation and emission maxima of JC-1 monomers are 510 and 527 nm, while those of JC-1 aggregates are 585 and 590 nm. Standard FITC and TRITC filter settings are sufficient for routine observation.
Because mitochondrial membrane depolarization is an early and critical event in apoptosis, the JC-1 assay provides a reliable and intuitive method for assessing mitochondrial health, apoptosis initiation, and drug-induced mitochondrial toxicity in a wide range of experimental systems.
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