A distinctive feature of the early stages of apoptosis is the disruption of the mitochondria, including changes in membrane and redox potential. We exclusively offer a number of fluorescent probes for analyzing mitochondrial activity in live cells by flow cytometry, with minimal disruption of cellular function.
The MitoProbe family of mitochondrial stains provide quick, easy, and reliable flow cytometric detection of the loss of mitochondrial membrane potential that occurs during apoptosis.
- Easy to use and compatible with existing research protocols
- Can be used with multiple cell types or laser excitations
- Available for 488 nm and 633/635 nm excitation
- Low compensation alternatives
MitoTracker dyes are membrane potential–dependent probes for staining mitochondria in live cells. The fluorescence signal of MitoTracker dyes is brighter in active mitochondria than in mitochondria with depolarized membranes, providing a way to identify healthy cells in a population.
The staining pattern of MitoTracker dyes is retained throughout subsequent flow cytometry immunocytochemistry, DNA end labeling, in situ hybridization, or counterstaining steps. MitoTracker Red CMXRos exhibits minimal spectral overlap when paired with a green-fluorescent dye, while MitoTracker Orange CMTMRos is compatible with far-red–fluorescent dyes.
The mitochondrial permeability transition pore (MPTP) is a nonspecific channel formed by components from the inner and outer mitochondrial membranes, and appears to be involved in the release of mitochondrial components during cell death. This assay provides a more direct method of measuring mitochondrial permeability transition pore opening than assays relying on mitochondrial membrane potential alone.
Figure 3. Flow cytometric analysis of MPTP using the MitoProbe Transition Pore Assay Kit. Jurkat cells were incubated with the reagents in the MitoProbe Transition Pore Assay Kit and analyzed by flow cytometry. In the absence of CoCl2 and ionomycin, fluorescent calcein is present in the cytosol as well as the mitochondria, resulting in a bright signal (left panel). In the presence of CoCl2, calcein in the mitochondria emits a signal, but the cytosolic calcein fluorescence is quenched; the overall fluorescence is reduced compared to calcein alone (center panel). When ionomycin (a calcium ionophore) and CoCl2 are added to the cells at the same time as calcein AM, the fluorescence signals from both the cytosol and mitochondria are largely abolished (right panel).
5 Steps Resources
Not for resale. Super Bright Polymer Dyes are sold under license from Becton, Dickinson and Company.
For Research Use Only. Not for use in diagnostic procedures.