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Calbryte™ 520 AM

ATP response was measured in CHO-K1 cells using Calbryte™ 520 AM (Cat No. 20653) and Fluo-4, AM (Cat No. 20550). CHO-K1 cells were seeded overnight at 50,000 cells/100 µL/well in a 96-well black wall/clear bottom costar plate. 100 µL of either 10 µg/mL Calbryte™ 520 AM in HH Buffer with probenecid or 10 µg/mL Fluo-4, AM in HH Buffer with probenecid was added to the wells and incubated for 45 minutes at 37°C.  Both dye loading solutions were removed and replaced with 200 µL HH Buffer/well.  ATP (50 µL/well) was added to achieve the final indicated concentration of 10 µM. Images were acquired on a Keyence microscope in the FITC channel.
ATP response was measured in CHO-K1 cells using Calbryte™ 520 AM (Cat No. 20653) and Fluo-4, AM (Cat No. 20550). CHO-K1 cells were seeded overnight at 50,000 cells/100 µL/well in a 96-well black wall/clear bottom costar plate. 100 µL of either 10 µg/mL Calbryte™ 520 AM in HH Buffer with probenecid or 10 µg/mL Fluo-4, AM in HH Buffer with probenecid was added to the wells and incubated for 45 minutes at 37°C.  Both dye loading solutions were removed and replaced with 200 µL HH Buffer/well.  ATP (50 µL/well) was added to achieve the final indicated concentration of 10 µM. Images were acquired on a Keyence microscope in the FITC channel.
ATP response was measured in CHO-K1 cells using Calbryte™ 520 AM (Cat No. 20653) and Fluo-4, AM (Cat No. 20550). CHO-K1 cells were seeded overnight at 50,000 cells/100 µL/well in a 96-well black wall/clear bottom costar plate. 100 µL of either 10 µg/mL Calbryte™ 520 AM in HH Buffer with probenecid or 10 µg/mL Fluo-4, AM in HH Buffer with probenecid was added to the wells and incubated for 45 minutes at 37°C.  Both dye loading solutions were removed and replaced with 200 µL HH Buffer/well.  ATP (50 µL/well) was added to achieve the final indicated concentration of 10 µM. Images were acquired on a Keyence microscope in the FITC channel.
Carbachol dose-response was measured in CHO-M1 cells with Calbryte™ 520 AM and Fluo-4 AM. CHO-M1 cells were seeded overnight at 50,000 cells/100 µL/well in a 96-well black wall/clear bottom costar plate. 100 µL of 10 µg/ml Calbryte™ 520 AM in HH Buffer or 10 µg/ml Fluo-4 in HH Buffer was added and incubated for 45 minutes at 37°C. Dye loading solution was then removed and replaced with 200 µL HH Buffer/well. Carbachol (50 µL/well) was added by FlexStation 3 to achieve the final indicated concentrations.
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Physical properties
Dissociation constant (Kd, nM)1200
Molecular weight1090.90
SolventDMSO
Spectral properties
Excitation (nm)493
Emission (nm)515
Quantum yield0.751
Storage, safety and handling
Certificate of OriginDownload PDF
H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22
StorageFreeze (< -15 °C); Minimize light exposure
UNSPSC12352200
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OverviewpdfSDSpdfProtocol


See also: Calcium Indicators, Fluo-3, Fluo-4
Molecular weight
1090.90
Dissociation constant (Kd, nM)
1200
Excitation (nm)
493
Emission (nm)
515
Quantum yield
0.751
The intracellular calcium flux assay is a widely used method in monitoring signal transduction pathways and high throughput screening of G protein"coupled receptors (GPCRs) and calcium channel targets. Followed by Fluo-3 being introduced in 1989, Fluo-4, Fluo-8 and Cal-520 were later developed with improved signal/background ratio, and became the widely used Ca2+ indicators for confocal microscopy, flow cytometry and high throughput screening applications. However, there are still a few severe problems with Fluo-4. For example, as for Fluo-3, in all most all the intracellular calcium assays with Fluo-4 AM, probenecid is required to prevent the cell-loaded Fluo-4 from leaking out of cells. The use of probenecid with Fluo-4-based calcium assays compromises the assay results since probenecid is well-documented to have a variety of complicated cellular effects. Calbryte™ 520, AM is a novel fluorescent and cell-permeable indicator for the measurement of intracellular calcium. Like other dye AM esters, Calbryte™ 520 AM is non-fluorescent and non-activatable. Once Calbryte™ 520 AM enters the cell, it is readily hydrolyzed by intracellular esterase where it becomes activated and responsive to calcium. The activated indicator is now a polar molecule that is incapable of freely diffusing through the cell membrane, essentially trapping it inside the cell. Upon binding calcium ions, Calbryte™ 520 produces a bright fluorescence signal with extremely high signal/background ratio. It has the identical excitation and emission wavelength as Fluo-4, thus the same Fluo-4 assay settings can be readily applied to Calbryte™ 520-based calcium assays. Its greatly improved signal/background ratio and intracellular retention properties make Calbryte™ 520 AM the most robust indicator for evaluating GPCR and calcium channel targets as well as for screening their agonists and antagonists in live cells.

Platform


Flow cytometer

Excitation488 nm laser
Emission530/30 nm filter
Instrument specification(s)FITC channel

Fluorescence microscope

ExcitationFITC
EmissionFITC
Recommended plateBlack wall/clear bottom

Fluorescence microplate reader

Excitation490
Emission525
Cutoff515
Recommended plateBlack wall/clear bottom
Instrument specification(s)Bottom read mode/Programmable liquid handling

Example protocol


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.

Calbryte™ 520 AM Stock Solution
Prepare a 2 to 5 mM stock solution of Calbryte™ 520 AM in anhydrous DMSO.

PREPARATION OF WORKING SOLUTION

Calbryte™ 520 AM Working Solution
On the day of the experiment, either dissolve Calbryte™ 520 AM in DMSO or thaw an aliquot of the indicator stock solution to room temperature. Prepare a dye working solution of 2 to 20 µM in a buffer of your choice (e.g., Hanks and Hepes buffer) with 0.04% Pluronic® F-127. For most cell lines, Calbryte™ 520 AM at a final concentration of 4 to 5 μM is recommended. The exact concentration of indicators required for cell loading must be determined empirically.
Note     The nonionic detergent Pluronic® F-127 is sometimes used to increase the aqueous solubility of Calbryte™ 520 AM. A variety of Pluronic® F-127 solutions can be purchased from AAT Bioquest.
Note     If your cells contain organic anion-transporters, probenecid (1-2 mM) may be added to the dye working solution (final in well concentration will be 0.5-1 mM) to reduce leakage of the de-esterified indicators. A variety of ReadiUse™ probenecid products, including water-soluble, sodium salt, and stabilized solution, can be purchased from AAT Bioquest.

SAMPLE EXPERIMENTAL PROTOCOL

Following is our recommended protocol for loading AM esters into live cells. This protocol only provides a guideline and should be modified according to your specific needs.
  1. Prepare cells in growth medium overnight.
  2. On the next day, add 1X Calbryte™ 520 AM working solution into your cell plate.
    Note     If your compound(s) interfere with the serum, replace the growth medium with fresh HHBS buffer before dye-loading.
  3. Incubate the dye-loaded plate in a cell incubator at 37 °C for 30 to 60 minutes.
    Note     Incubating the dye for longer than 1 hour can improve signal intensities in certain cell lines.
  4. Replace the dye working solution with HHBS or buffer of your choice (containing an anion transporter inhibitor, such as 1 mM probenecid, if applicable) to remove any excess probes.
  5. Add the stimulant as desired and simultaneously measure fluorescence using either a fluorescence microscope equipped with a FITC filter set or a fluorescence plate reader containing a programmable liquid handling system such as an FDSS, FLIPR, or FlexStation, at Ex/Em = 490/525 nm cutoff 515 nm. 

Calculators


Common stock solution preparation

Table 1. Volume of DMSO needed to reconstitute specific mass of Calbryte™ 520 AM to given concentration. Note that volume is only for preparing stock solution. Refer to sample experimental protocol for appropriate experimental/physiological buffers.

0.1 mg0.5 mg1 mg5 mg10 mg
1 mM91.667 µL458.337 µL916.674 µL4.583 mL9.167 mL
5 mM18.333 µL91.667 µL183.335 µL916.674 µL1.833 mL
10 mM9.167 µL45.834 µL91.667 µL458.337 µL916.674 µL

Molarity calculator

Enter any two values (mass, volume, concentration) to calculate the third.

Mass (Calculate)Molecular weightVolume (Calculate)Concentration (Calculate)Moles
/=x=

Spectrum


Open in Advanced Spectrum Viewer
spectrum

Spectral properties

Excitation (nm)493
Emission (nm)515
Quantum yield0.751

Product Family


NameExcitation (nm)Emission (nm)
Calbryte™ 590 AM581593
Calbryte™ 630 AM607624
Calbryte™-520L AM493515
Calbryte™-520XL AM493515
Cal-520®, AM493515
Mag-520™ AM506525
SoNa™ 520 AM491511

Images


ATP response&nbsp;was measured in&nbsp;CHO-K1&nbsp;cells using&nbsp;Calbryte&trade; 520 AM (Cat No. 20653) and Fluo-4, AM (Cat No. 20550).&nbsp;CHO-K1&nbsp;cells were seeded overnight at 50,000 cells/100 &micro;L/well in a 96-well black wall/clear bottom costar plate. 100 &micro;L of either 10 &micro;g/mL&nbsp;Calbryte&trade; 520 AM&nbsp;in HH&nbsp;Buffer with probenecid&nbsp;or 10 &micro;g/mL Fluo-4, AM in HH Buffer&nbsp;with probenecid&nbsp;was&nbsp;added to the wells and incubated for 45 minutes at 37&deg;C. &nbsp;Both dye loading solutions were removed and replaced with 200 &micro;L HH Buffer/well.&nbsp; ATP&nbsp;(50 &micro;L/well) was added&nbsp;to&nbsp;achieve the final indicated&nbsp;concentration of 10 &micro;M. Images were acquired on a Keyence microscope in the FITC channel.
Figure 1. ATP response was measured in CHO-K1 cells using Calbryte™ 520 AM (Cat No. 20653) and Fluo-4, AM (Cat No. 20550). CHO-K1 cells were seeded overnight at 50,000 cells/100 µL/well in a 96-well black wall/clear bottom costar plate. 100 µL of either 10 µg/mL Calbryte™ 520 AM in HH Buffer with probenecid or 10 µg/mL Fluo-4, AM in HH Buffer with probenecid was added to the wells and incubated for 45 minutes at 37°C.  Both dye loading solutions were removed and replaced with 200 µL HH Buffer/well.  ATP (50 µL/well) was added to achieve the final indicated concentration of 10 µM. Images were acquired on a Keyence microscope in the FITC channel.
Carbachol dose-response was measured in CHO-M1 cells with Calbryte&trade; 520 AM and Fluo-4 AM. CHO-M1 cells were seeded overnight at 50,000 cells/100 &micro;L/well in a 96-well black wall/clear bottom costar plate. 100 &micro;L of 10 &micro;g/ml Calbryte&trade; 520 AM in HH Buffer or 10 &micro;g/ml Fluo-4 in HH Buffer was added and incubated for 45 minutes at 37&deg;C. Dye loading solution was then removed and replaced with 200 &micro;L HH Buffer/well. Carbachol (50 &micro;L/well) was added by FlexStation 3 to achieve the final indicated concentrations.
Figure 2. Carbachol dose-response was measured in CHO-M1 cells with Calbryte™ 520 AM and Fluo-4 AM. CHO-M1 cells were seeded overnight at 50,000 cells/100 µL/well in a 96-well black wall/clear bottom costar plate. 100 µL of 10 µg/ml Calbryte™ 520 AM in HH Buffer or 10 µg/ml Fluo-4 in HH Buffer was added and incubated for 45 minutes at 37°C. Dye loading solution was then removed and replaced with 200 µL HH Buffer/well. Carbachol (50 µL/well) was added by FlexStation 3 to achieve the final indicated concentrations.

Citations


View all 182 citations: Citation Explorer
Effects of extremely low frequency electromagnetic fields on the tumor cell inhibition and the possible mechanism
Authors: Sun, Jie and Tong, Yingying and Jia, Yu and Jia, Xu and Wang, Hua and Chen, Yang and Wu, Jiamin and Jin, Weiyang and Ma, Zheng and Cao, Kai and others,
Journal: Scientific Reports (2023): 6989
Probabilistic cell seeding and non-autofluorescent 3D-printed structures as scalable approach for multi-level co-culture modeling
Authors: Buchmann, Sebastian and Enrico, Alessandro and Holzreuter, Muriel Alexandra and Reid, Michael and Zeglio, Erica and Niklaus, Frank and Stemme, G{\"o}ran and Herland, Anna
Journal: Materials Today Bio (2023): 100706
An airway-to-brain sensory pathway mediates influenza-induced sickness
Authors: Bin, Na-Ryum and Prescott, Sara L and Horio, Nao and Wang, Yandan and Chiu, Isaac M and Liberles, Stephen D
Journal: Nature (2023): 1--8
A succinate/SUCNR1-brush cell defense program in the tracheal epithelium
Authors: Perniss, Alexander and Boonen, Brett and Tonack, Sarah and Thiel, Moritz and Poharkar, Krupali and Alnouri, Mohamad Wessam and Keshavarz, Maryam and Papadakis, Tamara and Wiegand, Silke and Pfeil, Uwe and others,
Journal: Science Advances (2023): eadg8842
Restoring calcium homeostasis in Purkinje cells arrests neurodegeneration and neuroinflammation in the ARSACS mouse model
Authors: Del Bondio, Andrea and Longo, Fabiana and De Ritis, Daniele and Spirito, Erica and Podini, Paola and Brais, Bernard and Bachi, Angela and Quattrini, Angelo and Maltecca, Francesca
Journal: JCI insight (2023)
Deletion of SNX9 alleviates CD8 T cell exhaustion for effective cellular cancer immunotherapy
Authors: Trefny, Marcel P and Kirchhammer, Nicole and Auf der Maur, Priska and Natoli, Marina and Schmid, Dominic and Germann, Markus and Fernandez Rodriguez, Laura and Herzig, Petra and L{\"o}tscher, Jonas and Akrami, Maryam and others,
Journal: Nature Communications (2023): 86
Functional characteristics of hub and wave-initiator cells in b cell networks
Authors: {\v{S}}terk, Marko and Dolen{\v{s}}ek, Jurij and Klemen, Ma{\v{s}}a Skelin and Bombek, Lidija Krizancic and Leitgeb, Eva Paradiz and Kercmar, Jasmina and Perc, Matjaz and Rupnik, Marjan Slak and Stozer, Andraz and Gosak, Marko
Journal: (2023)
High Throughput Longitudinal Electrophysiology Screening of Mature Chamber Specific hiPSC-CMs Using Optical Mapping
Authors: Allan, Andrew and Creech, Jeffery and Hausner, Christian and Krajcarski, Peyton and Gunawan, Bianca and Poulin, Noah and Kozlowski, Paul and Clark, Christopher Wayne and Dow, Rachel and Saraithong, Prakaimuk and others,
Journal: iScience (2023)

References


View all 63 references: Citation Explorer
Calreticulin regulates TGF-&beta;1-induced epithelial mesenchymal transition through modulating Smad signaling and calcium signaling
Authors: Wu, Yanjiao and Xu, Xiaoli and Ma, Lunkun and Yi, Qian and Sun, Weichao and Tang, Liling
Journal: The International Journal of Biochemistry &amp; Cell Biology (2017)
Monosialoganglioside 1 may alleviate neurotoxicity induced by propofol combined with remifentanil in neural stem cells
Authors: Lu, Jiang and Yao, Xue-qin and Luo, Xin and Wang, Yu and Chung, Sookja Kim and Tang, He-xin and Cheung, Chi Wai and Wang, Xian-yu and Meng, Chen and Li, Qing and others, undefined
Journal: Neural Regeneration Research (2017): 945
Obtaining spontaneously beating cardiomyocyte-like cells from adipose-derived stromal vascular fractions cultured on enzyme-crosslinked gelatin hydrogels
Authors: Yang, Gang and Xiao, Zhenghua and Ren, Xiaomei and Long, Haiyan and Ma, Kunlong and Qian, Hong and Guo, Yingqiang
Journal: Scientific Reports (2017): 41781
Dexmedetomidine reduces hypoxia/reoxygenation injury by regulating mitochondrial fission in rat hippocampal neurons
Authors: Liu, Jia and Du, Qing and Zhu, He and Li, Yu and Liu, Maodong and Yu, Shoushui and Wang, Shilei
Journal: Int J Clin Exp Med (2017): 6861--6868
Di (2-ethylhexyl) phthalate-induced apoptosis in rat INS-1 cells is dependent on activation of endoplasmic reticulum stress and suppression of antioxidant protection
Authors: Sun, Xia and Lin, Yi and Huang, Qiansheng and Shi, Junpeng and Qiu, Ling and Kang, Mei and Chen, Yajie and Fang, Chao and Ye, Ting and Dong, Sijun
Journal: Journal of cellular and molecular medicine (2015): 581--594
The effect of mitochondrial calcium uniporter on mitochondrial fission in hippocampus cells ischemia/reperfusion injury
Authors: Zhao, Lantao and Li, Shuhong and Wang, Shilei and Yu, Ning and Liu, Jia
Journal: Biochemical and biophysical research communications (2015): 537--542
Role of mitochondrial calcium uniporter in regulating mitochondrial fission in the cerebral cortexes of living rats
Authors: Liang, Nan and Wang, Peng and Wang, Shilei and Li, Shuhong and Li, Yu and Wang, Jinying and Wang, Min
Journal: Journal of Neural Transmission (2014): 593--600
Propofol and remifentanil at moderate and high concentrations affect proliferation and differentiation of neural stem/progenitor cells
Authors: Li, Qing and Lu, Jiang and Wang, Xianyu and others, undefined
Journal: Neural regeneration research (2014): 2002
Fungus induces the release of IL-8 in human corneal epithelial cells, via Dectin-1-mediated protein kinase C pathways.
Authors: Peng, Xu-Dong and Zhao, Gui-Qiu and Lin, Jing and Jiang, Nan and Xu, Qiang and Zhu, Cheng-Cheng and Qu, Jain-Qiu and Cong, Lin and Li, Hui
Journal: International journal of ophthalmology (2014): 441--447
Increased expression of cell adhesion molecule 1 by mast cells as a cause of enhanced nerve--mast cell interaction in a hapten-induced mouse model of atopic dermatitis
Authors: Hagiyama, M and Inoue, T and Furuno, T and Iino, T and Itami, S and Nakanishi, M and Asada, H and Hosokawa, Y and Ito, A
Journal: British Journal of Dermatology (2013): 771--778

Documents


Certificate of origin
Safety data sheet
Product protocol
Certificate of analysis

Application notes


Calbryte™ 520, Calbryte™ 590 and Calbryte™ 630 Calcium Detection Reagents
Calibration Protocol for Fluorescent Calcium Indicators
Introducing Calbryte™ Series
What's A Ratiometric Indicator
A Comparison of Fluorescent Red Calcium Indicators for Detecting Intracellular Calcium Mobilization in CHO Cells

FAQ


Are there any calcium indicators that don't require probenecid (PBC)?
Can I intracellularly measure mitochondria calcium flux and changes in mitochondria membrane potential at the same time?
Do you offer any products for measuring intracellular calcium concentration or movement by flow cytometry?
What is a calcium flux assay?
What is a calcium ion?

AssayWise


Calbryte™ series now available
Multicolor Intracellular Calcium Detection Probes
Cal-520™ Calcium Indicators
Cal-590™ Calcium Indicators
Cal-630™ Calcium Indicators
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