The MitoPT TMRE Assay detects mitochondrial membrane depolarization utilizing the fluorescent dye TMRE. When accumulated in a negatively charge polarized mitochondria, TMRE fluoresces orange. When mitochondrial membrane potential collapses in apoptotic or metabolically stressed cells, TMRE reagent is dispersed through the cell cytosol and fluorescence levels drop dramatically. Analyze your results using a flow cytometer, fluorescence plate reader, or fluorescence microscopy.

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MitoPT TMRE Assay
SKU: 9103

Size: 500 Tests
Sale price$281.00

Bulk Order MitoPT TMRE Assay

Loss of mitochondrial membrane potential is indicative of apoptosis. ICT’s MitoPT TMRE Assay utilizes the potentiometric fluorescent dye TMRE to detect mitochondrial membrane permeability and membrane depolarization. The TMRE dye has a delocalized positive charge dispersed throughout its molecular structure. In addition, its lipophilic solubility enables it to be readily membrane permeant and penetrate living cells. The TMRE dye enters the negatively charge mitochondria where it accumulates and fluoresces orange upon excitation. When the mitochondrial membrane potential collapses in apoptotic cells, MitoPT TMRE becomes distributed throughout the cytosol. Detection of the loss of orange-red fluorescence in TMRE stained cells is a reliable method for assessing apoptosis induction or oxidative stress-induced mitochondrial depolarization in experimental cell populations.
Mitochondrial depolarization
549 nm / 574 nm
Flow cytometry, Fluorescence microscope, fluorescence plate reader
Cell culture
Domestic: Overnight Delivery; International: Priority Shipping
United States
  1. Prepare samples.
  2. Create controls with CCCP.
  3. Dilute 10X Assay Buffer 1:10 with diH2O.
  4. Reconstitute MitoPT TMRE with DMSO.
  5. Dilute MitoPT TMRE with 1X Assay Buffer.
  6. Add MitoPT TMRE to each sample.
  7. Incubate 15-30 minutes.
  8. Wash cells: add 1X Assay Buffer and spin cells.
  9. Remove supernatant and resuspend cells for analysis.
  10. Anazlyze with a fluorescence microscope, fluorescence plate reader, or flow cytometer. MitoPT TMRE excites at 549 nm and emits at 574 nm (orange).
  • MitoPT TMRE Reagent, 500 Tests, #6254
  • 10X Assay Buffer, 2 x 125 mL, #6259
  • CCCP, 50 mM, 600 µL, #6258
  • Kit Manual
  • Merkel, M;Goebel, B;Boll, M;Adhikari, A;Maurer, V;Steinhilber, D;Culmsee, C. Mitochondrial Reactive Oxygen Species Formation Determines ACSL4/LPCAT2-Mediated Ferroptosis. Antioxidants (Basel, Switzerland). 2023 August

    Rehklau K, Hoffmann L, Gurniak CB, Ott M, Witke W, Scorrano L, Culmsee C, Rust MB. Cofilin1-dependent actin dynamics control DRP1-mediated mitochondrial fission. Cell Death Dis. 2017. Oct 5;8(10):e3063. doi: 10.1038/cddis.2017.448. Abstract

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