CytoTrace™ Red CMTPX

CytoTrace™ Red CMTPX is a cell-permeant, mitochondria-targeted fluorescent dye designed for long-term tracking of viable cells in culture. After intracellular processing and covalent retention, it produces a stable red fluorescence signal that persists through multiple cell divisions, enabling lineage and proliferation studies without the need for continuous dye replenishment. Its red emission also supports multicolor workflows when paired with spectrally compatible fluorophores.

1. Cell Lineage Tracking

CytoTrace™ Red CMTPX is used by cell biology and stem cell research groups to follow progeny of initially labeled populations over extended culture periods. Researchers typically label cells at the start of an experiment and then monitor dilution of the retained red fluorescence as cells divide, providing a practical readout for lineage propagation and proliferation dynamics in adherent or suspension systems. The retained signal supports longitudinal imaging and endpoint analyses, including comparisons across experimental conditions such as perturbations to growth or differentiation protocols.

2. Fluorescence Microscopy Imaging

CytoTrace™ Red CMTPX is commonly applied in fluorescence microscopy to visualize labeled cells and map spatial patterns of proliferation within heterogeneous cultures. Imaging workflows benefit from the dye's retained red fluorescence, which reduces the need for repeated staining during time-course experiments. Laboratories use it to assess relative expansion of labeled subpopulations in co-culture formats, spheroids, or tissue-like models where tracking cell behavior over time is essential for interpreting cellular dynamics.

3. Flow Cytometry Proliferation Analysis

CytoTrace™ Red CMTPX is frequently used in flow cytometry to quantify proliferation by measuring fluorescence intensity distributions after defined culture intervals. In typical experimental design, researchers gate on viable cells, then analyze how the red fluorescence shifts due to signal dilution among daughter cells, enabling robust population-level comparisons between treatment groups. The dye's retained labeling supports consistent endpoint measurements and supports multicolor panels when combined with other markers for phenotype or viability.

4. Multicolor Phenotyping With Proliferation

CytoTrace™ Red CMTPX is used in immunophenotyping workflows where proliferation status is correlated with additional cellular markers. By combining the retained red dye signal with antibody-based staining for surface or intracellular targets, researchers can distinguish proliferating versus non-proliferating subpopulations and relate those states to marker-defined phenotypes. This approach is particularly valuable in mechanistic studies of differentiation, activation, or culture-driven remodeling where cell division and marker expression need to be interpreted together.