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CytoTell™ UltraGreen

Flow cytometry combined with fluorescence staining is a powerful tool to analyze heterogeneous cell populations. Among all the existing fluorescent dyes CFSE is the preferred cell proliferation indicator that is widely used for live cell analysis. However, there are a few severe problems associated with the use of CFSE for monitoring cell proliferation. 1). CFSE is highly toxic to cells. CFSE indiscriminately reacts with all amino groups, thus changes many critical intracellular protein functions (such as cell membrane GPCRs); 2). CFSE has slow response and is inconvenient to use. The CFSE fluorescence intensity of the 2nd generation cells is decreased more than 10 fold from the 1st generation. You would have to wait for another generation to start the cell proliferation analysis. 3). Medium removal is required. You would have to remove medium for cell analysis with a flow cytometer since CFSE reacts with medium components. CytoTell™ Green has been developed to eliminate these CFSE limitations. Based on our customers' feedbacks on our CytoTell™ Green, CytoTell™ UltraGreen is our newest improvement. It has distinct advantages. 1). CytoTell™ UltraGreen is well retained in cells; 2). CytoTell™ UltraGreen exhibits much faster response and is more convenient to use than CFSE. The fluorescence intensity gap between 1st and 2nd generation is significantly minimized. As cells divide, CytoTell™ UltraGreen is distributed equally between daughter cells that can be measured as successive halving of the fluorescence intensity of the dye; 3). CytoTell™ UltraGreen is more sensitive than CFSE. Up to 9 generations may be visualized; 4). CytoTell™ UltraGreen is much more stable than CFSE. CytoTell™ UltraGreen stock solution can be stored at room temperature for a few days. CytoTell™ UltraGreen can also be used for long term tracking of labeled cells. Analysis using two-parameter plots may provide better resolution of each generation, especially between undivided cells and the first generation. CytoTell™ UltraGreen has a peak excitation of 492 nm and can be excited by the blue (488 nm) laser line, making it compatible with FITC filter set.

Example protocol

AT A GLANCE

Protocol Summary
  1. Prepare cells with test compounds
  2. Add 1X dye working solution
  3. Incubate dyes with cells at room temperature or 37 oC for 10 to 30 minutes
  4. Remove the dye working solution
  5. Analyse with flow cytometer with appropriate filter set
Important Note

Bring all the kit components at room temperature before starting the experiment.

Note: The CytoTell™ dyes are lyophilized powders. They should be stable for at least 6 months if store at -20 °C, protecting from light, and avoiding freeze/thaw cycles.

PREPARATION OF STOCK SOLUTIONS

Unless otherwise noted, all unused stock solutions should be divided into single-use aliquots and stored at -20 °C after preparation. Avoid repeated freeze-thaw cycles

CytoTell™ dye stock solution (500X)

Add 500 µL DMSO into the dye powder vial, mix it well by vortexing to have a stock solution (500X).

Note: The stock solution should be used promptly; any remaining solution should be aliquoted and frozen at < - 20 oC. Avoid repeated freeze-thaw cycles, and protect from light.

PREPARATION OF WORKING SOLUTION

CytoTellTM dye working solution (1X)

Dilute the 500X DMSO stock solution at 1 to 500 in Hanks and 20 mM Hepes buffer (HHBS) or the buffer of your choice, pH 7 (such as 1 µL of 500X DMSO stock solution to 500 µL buffer) right before use. Mix them well by vortexing.

Note: The final concentration of the dye working solution should be empirically determined for different cell types and/or experimental conditions. It is recommended to test at the concentrations that are at least over ten fold range. Such as CytoTell™ Red might use much less amount in some cell types than the recommend concentrations.

SAMPLE EXPERIMENTAL PROTOCOL

  1. Treat cells with test compounds for a desired period of time.
  2. Centrifuge the cells to get 1-5 × 105 cells per tube.
  3. Resuspend cells in 500 µL of the CytoTell™ dye working solution.

    Optional: One can add the 500X DMSO stock solution into the cells directly without medium removing (such as, add 1 µL500X DMSO stock solution into 500 µL cells)

  4. Incubate cells with a dye solution at room temperature or 37 °C for 10 to 30 minutes, protected from light.
  5. Remove the dye working solution from the cells, wash the cells with HHBS or buffer of your choice. Resuspend cells in 500 µL of pre-warmed HHBS or medium to get 1-5 × 105 cells per tube.
  6. Monitor the fluorescence change at respected Ex/Em (see Table 1) with a flow cytometer or a fluorescence microscope.

Spectrum

Product family

NameExcitation (nm)Emission (nm)
CytoTell™ Blue410445
CytoTell™ Green510525
CytoTell™ Orange541560

Citations

View all 18 citations: Citation Explorer
PD-L1-expressing cancer-associated fibroblasts induce tumor immunosuppression and contribute to poor clinical outcome
Authors: Kawasaki, Kento and Noma, Kazuhiro and Kato, Takuya and Ohara, Toshiaki and Tanabe, Shunsuke and Takeda, Yasushige and Matsumoto, Hijiri and Nishimura, Seitaro and Kunitomo, Tomoyoshi and Akai, Masaaki and others,
Journal: (2023)
Lipocalin 2, synthesized using a cell-free protein synthesis system and encapsulated into liposomes, inhibits the adhesion of Porphyromonas gingivalis to human oral epithelial cells
Authors: Kido, Jun-ichi and Hiroshima, Yuka and Kido, Rie and Yoshida, Kaya and Inagaki, Yuji and Naruishi, Koji and Kajimoto, Kazuaki and Kataoka, Masatoshi and Shinohara, Yasuo and Yumoto, Hiromichi
Journal: Journal of Periodontal Research (2022)
Effect of impaired T-cell receptor signaling on the gut microbiota and systemic autoimmunity
Authors: Shirakashi, Mirei and Maruya, Mikako and Hirota, Keiji and Tsuruyama, Tatsuaki and Matsuo, Takashi and Watanabe, Ryu and Murata, Koichi and Tanaka, Masao and Ito, Hiromu and Yoshifuji, Hajime and others,
Journal: Arthritis \& Rheumatology (2021)
Extracellular vesicles of P. gingivalis-infected macrophages induce lung injury
Authors: Yoshida, Kayo and Yoshida, Kaya and Fujiwara, Natsumi and Seyama, Mariko and Ono, Kisho and Kawai, Hotaka and Guo, Jiajie and Wang, Ziyi and Weng, Yao and Yu, Yaqiong and others,
Journal: Biochimica et Biophysica Acta (BBA)-Molecular Basis of Disease (2021): 166236
Development of double-positive thymocytes at single-cell resolution
Authors: Li, Young and Li, Kun and Zhu, Lianbang and Li, Bin and Zong, Dandan and Cai, Pengfei and Jiang, Chen and Du, Pengcheng and Lin, Jun and Qu, Kun
Journal: Genome medicine (2021): 1--18
Page updated on October 12, 2024

Ordering information

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500 Tests
2x500 Tests
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Physical properties

Molecular weight

~500

Solvent

DMSO

Spectral properties

Excitation (nm)

492

Emission (nm)

514

Storage, safety and handling

H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22

Storage

Freeze (< -15 °C); Minimize light exposure
UNSPSC12352200

Platform

Flow cytometer

Excitation488 nm laser
Emission530, 30 nm filter
Instrument specification(s)FITC channel
Cell tracking assay using CytoTell&trade; UltraGreen. Jurkat cells (~2x10^6 cells/mL) were stained with CytoTell&trade; UltraGreen on Day 0. Cells were passed serially at 1:1 ratio for 7 days. Fluorescence intensity was measured using ACEA NovoCyte flow cytometer in FITC channel. Successive generations were represented by different colors.
Cell tracking assay using CytoTell&trade; UltraGreen. Jurkat cells (~2x10^6 cells/mL) were stained with CytoTell&trade; UltraGreen on Day 0. Cells were passed serially at 1:1 ratio for 7 days. Fluorescence intensity was measured using ACEA NovoCyte flow cytometer in FITC channel. Successive generations were represented by different colors.
Cell tracking assay using CytoTell&trade; UltraGreen. Jurkat cells (~2x10^6 cells/mL) were stained with CytoTell&trade; UltraGreen on Day 0. Cells were passed serially at 1:1 ratio for 7 days. Fluorescence intensity was measured using ACEA NovoCyte flow cytometer in FITC channel. Successive generations were represented by different colors.