What is the significance of mitochondrial proteins in neurons?

Mitochondrial proteins are essential for energy production and cellular metabolism, impacting neuronal health and function.

How does flow cytometry work in this context?

Flow cytometry analyzes the physical and chemical characteristics of cells by passing them through a laser and detecting emitted fluorescence.

What are the main challenges in labeling mitochondrial proteins?

Challenges include preventing non-specific binding and ensuring adequate penetration of antibodies into the mitochondrial membranes.

Can this method be used for other cell types?

Yes, the protocol can be adapted for various cell types that require mitochondrial analysis.

What are the applications of this study?

Applications include research on neurodegenerative diseases, metabolic disorders, and mitochondrial dysfunction.

How can the results be interpreted?

Results can indicate the health of mitochondria and their role in neuronal function and disease.

Measurement of Multiple Mitochondrial Parameters in Neurons using Flow Cytometry

JoVE Encyclopedia of Experiments

Neuroscience

0 views • 2:09 min • July 8th, 2025

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Take fixed and permeabilized neurons in a tube.

Add a blocking buffer to prevent non-specific antibody binding.

Centrifuge the suspension and remove the supernatant. Then, resuspend the neurons in buffer.

Transfer the suspension equally into tubes containing untagged and fluorophore-tagged primary antibodies.

Incubate, allowing the antibodies to specifically bind to mitochondrial respiratory chain or MRC complex subunits, a mitochondrial DNA-associated protein, and a mitochondrial outer membrane protein within the neurons.

Remove any unbound antibodies.

Incubate with fluorophore-tagged secondary antibodies that bind to the untagged primary antibodies.

Centrifuge the mixture and discard the supernatant.

Resuspend the neurons in buffer and transfer them to microcentrifuge tubes.

Perform flow cytometry to detect the fluorescent signals on the labeled neurons, corresponding to the expression levels of MRC complex subunits and the measurement of relative mitochondrial DNA levels.

Block the samples in 1 milliliter of blocking buffer, and wash the cells by centrifugation with PBS as demonstrated. To detect different mitochondrial complexes and subunits, incubate the cells for 30 minutes with the respective primary antibodies described in the text manuscript. After washing the cells once with PBS, incubate the cells with secondary antibody for 30 minutes.

At the end of the incubation, wash and resuspend the cells in PBS as demonstrated. Transfer the cell suspension into a 1.5-milliliter microcentrifuge tube, kept in the dark, on ice. Next, analyze the cells on the flow cytometer and detect signals and filter one using a 530/30 bandpass filter.