Kinetic measurement of cytotoxicity using CellTox Green Cytotoxicity Assay on the IncuCyte TM FLR or ZOOM
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1 Kinetic measurement of cytotoxicity using CellTox Green Cytotoxicity Assay on the IncuCyte TM FLR or ZOOM The CellPlayer TM cytotoxicity assay described in this protocol utilizes CellTox Green Dye (Promega, Cat #: G8731), a cell impermeant cyanine dye that binds to dsdna of membrane compromised cells. This allows for the kinetic evaluation of cytotoxicity using the IncuCyte TM FLR or ZOOM live-cell imaging systems. CellTox Green Dye can be added directly to tissue culture wells using a no-wash, mix-and-read protocol in complete growth medium. Optimizing CellTox Green Dye Concentration Before setting-up an experiment, we recommend titrating the CellTox Green reagent with your cell line and desired medium in order to determine the optimal CellTox Green Dye concentration. CellTox Green Dye should not affect the proliferation rate of the cells. To find the optimal CellTox Green Dye concentration, we recommend growing cells in a range of concentrations (1:1000-1:64000) in the presence or absence of a cytotoxic compound, such as camptothecin. Phase confluence data can be used to identify the maximum tolerated concentration of CellTox Green Dye, one that has no adverse effects on cell proliferation (Figure 1A). Green fluorescence data should be used to determine the minimum concentration necessary for optimal signal (Figure 1B). Figure 1: Determining the Optimal Concentration of CellTox Green Dye. Left) HT-1080 cells were grown in the presence of increasing dilutions of CellTox Green Dye. Confluence was monitored over time. CellTox Dye did not have an effect on proliferation at any dilution tested. Right) HT-1080 cells were treated with 150nM camptothecin in the presence of varying dilutions of CellTox Green Dye. Cells treated with 1:4000 CellTox Green Dye showed a similar response as those treated with 1:1000 CellTox Green Dye. A 1:4000 dilution was chosen for further experimentation.
2 2 CellPlayer 96-Well Kinetic CellTox Green Cytotoxicity Protocol Sample Protocol Day 0: 1) Plate cells per well in a 96-well plate such that the next day, cells are approximately 10-20% confluent (N=3 wells per treatment is recommended). For example, HT-1080 and MDA-MB-231 cells are 10-20% confluent hours post seeding. Confluence can be monitored in the IncuCyte TM FLR or ZOOM. Day 1: 2) Treatment preparation a. Dilute CellTox Green Dye in desired medium formulation. Promega recommends diluting the reagent 1:500-1:2000. Determine the optimal concentration for your specific cell type following the protocol described above. NOTE: All test agents will be diluted in this medium, so make up a volume that will accommodate all treatment conditions and reagent dilutions. b. Prepare drug dilutions using media containing CellTox Green Dye. A volume of 100 µl per well is generally sufficient for the duration of the assay. 3) Aspirate spent media from the 96-well plate containing cells, and add 100 µl prepared treatments to cells 4) Place the plate within a microplate tray into the IncuCyte TM FLR or ZOOM 5) Set Scan Type to Fluorescence & Phase-Contrast if using the IncuCyte FLR or select the phase and green channels if using the IncuCyte ZOOM 6) Acquire images every 2-3 hours. Collecting 2 images per well is recommended NOTE: A delay of minutes before the first scan is recommended to allow the plate sufficient time to equilibrate to the incubator environment. Insufficient equilibration may result in condensation on the bottom of lid compromising image quality. Ending the assay and data analysis Assay duration will vary depending on the cytotoxic stimulus and cell type used. It is recommended to track the experiment s progress by either performing an Open Ended analysis job, which can be initiated after the first scan is complete, when using the IncuCyte FLR or ZOOM, or to apply an analysis job at the time of scheduling when using the IncuCyte ZOOM. Both the IncuCyte TM FLR and ZOOM will automatically collect and store data until the plate is removed from the instrument, and therefore the end of the assay may be determined retroactively. Data analysis of cytotoxicity is best done using the object counting analysis built
3 CellPlayer 96-Well Kinetic Cytotoxicity Protocol 3 into the IncuCyte FLR software or the IncuCyte ZOOM basic analyzer. Common metrics used when using IncuCyte analysis tools include both object count/mm 2 and object confluence, although the specific metric used to measure cytotoxicity is up to the user. In the example below, CellTox object count/mm 2 over time is used to quantify the number of dying cells in response to a staurosporine (Figure 2A). The area under the curve (AUC) of object count/mm 2 over time is used to kinetically calculate EC50 values (Figure 2B). For more complete information on analysis, see the CellPlayer 96-Well Cytotoxicity Application Note at A B Figure 2: Data Analysis using CellTox Green Dye. HT-1080 cells were treated with varying concentrations of staurosporine in the presence of CellTox Green Dye (diluted 1:4000). A) CellTox object counts/mm 2 were measured over time using IncuCyte ZOOM s basic analyzer and used to show a staurosporine concentration response. B) Area under the curve of CellTox object counts/mm 2 over time was used to calculate an EC50 value of 41.2nM. Optional: Endpoint Normalization Using Triton X-100 In order to factor cell proliferation into the final analysis when using an IncuCyte FLR, we recommend normalizing the number of CellTox Green Dye positive objects at the end of the assay to the total number of DNA containing objects. Permeablizing the intact cells with the direct addition of % Triton X-100 to label all DNA-containing objects with CellTox Green Dye at the end of the assay.* The final total DNA-containing object count can then be utilized to normalize the data. *NOTE: The concentration of Triton X-100 or the incubation time allowed to permeablize cells may have to be adjusted depending upon cell type used.
4 4 CellPlayer 96-Well Kinetic CellTox Green Cytotoxicity Protocol Sample Protocol: 1) Prepare Triton X-100 for end point labeling a. Final concentration of Triton X-100 within each well should be % b. Dilutions of Triton X-100 can be made in either culture medium or PBS 2) Add diluted Triton X-100 directly to the wells immediately after the final CellTox Green scan. NOTE: Do not remove media from wells. The CellTox Green Dye staining present in the treatment is required for assessing total number of DNA containing objects. 3) Set the plate within a microplate tray into the IncuCyte TM FLR or ZOOM and incubate for 15min. 4) After incubation, schedule a single scan to acquire endpoint total DNA (CellTox Green) objects. 5) Export the object count data collected during the final scan of the CellTox Green assay and paste it into a 3 rd party spreadsheet program 6) Export the data collected following the treatment of wells with Triton X-100 Calculate Cytotoxic Index: Cytotoxic Index = #CellTox Green positive objects Total # of DNA containing objects Multiplexing: Monitor Proliferation using the CellPlayer NucLight Red Reagent or Cell Lines When used in conjunction with CellTox Green Dye and the IncuCyte ZOOM, Essen s NucLight Reagents and Cell Lines provide the unique ability to simultaneously measure proliferation and cytotoxicity within a single well. To accomplish this, first label your cell line of interest with the NucLight Red nuclear labeling reagent (Cat# 4476). Once established, use this cell line to complete the protocol described above. Apply an analysis job using a basic analyzer processing definition that includes phase (confluence), green (CellTox Green positive), and red (rednuclear cell label) analysis channels. Proliferation (Figure 3a) and cytotoxicity (Figure 3b) measurements will be kinetically monitored throughout the assay duration in real time. Area under the curve (AUC) of Nuclear and CellTox counts over time is used to calculate pharmacology EC50 and IC50 values, respectively (Figure 3c).
5 CellPlayer 96-Well Kinetic Cytotoxicity Protocol 5 Figure 3: Cytotoxicity and Proliferation Multiplex Data Set. HT-1080 NucLight Red cells were treated with varying concentrations of camptothecin (CMP) in the presence of CellTox Green Dye. (A) NucLight Red and (B) CellTox Green object counts/mm 2 were monitored over time using IncuCyte ZOOM s basic analyzer and used to show a camptothecin concentration response. (C) The area under the curve (AUC) of nuclear and CellTox objects/mm 2 over time was used to calculate IC 50 and EC 50 values, respectively. Related Products NucLight Reagents: Cat.# 4476 CellPlayer NucLight Red (Lenti, EF-1 alpha, puro) Cat.#4478 CellPlayer NucLight Red (Lenti, EF-1 apha, bleo) NucLight Cell Lines: Cat.# 4485 CellPlayer HT-1080 NucLight Red Cat.# 4487 CellPlayer MDA-MB-231 NucLight Red Cat.# 4489 CellPlayer HeLa NucLight Red Cat.# 4491 CellPlayer A549 NucLight Red Cat.# 4512 CellPlayer Neuro-2a NucLight Red For additional information on this and other products, please contact Essen BioScience at: sales@esenbio.com
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