ab MTT Cell Proliferation Assay Kit
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1 Version 1 Last updated 22 March 2018 ab MTT Cell Proliferation Assay Kit For the measurement of cell proliferation in cultured cells. This product is for research use only and is not intended for diagnostic use. Copyright 2018 Abcam. All rights reserved
2 Table of Contents 1. Overview 1 2. Protocol Summary 2 3. Precautions 3 4. Storage and Stability 3 5. Limitations 4 6. Materials Supplied 4 7. Materials Required, Not Supplied 5 8. Technical Hints 6 9. Reagent Preparation Assay Procedure Typical Data Troubleshooting Notes 12 Copyright 2018 Abcam. All rights reserved
3 1. Overview MTT Cell Proliferation Assay Kit (ab211091) provides a simple and accurate method to quantify cell proliferation and viability. The assay is based on the conversion of water soluble MTT (3-(4,5- dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) compound to an insoluble formazan product. Viable cells with active metabolism convert MTT into formazan. Dead cells, on the other hand, lose this ability and therefore show no signal. Thus color formation serves as a useful and convenient marker of only the viable cells. The measured absorbance at OD 590 nm is proportional to the number of viable cells. This assay kit provides an easy-to-use, non-radioactive, and highthroughput method for measuring cell proliferation, cell viability and cytotoxicity. MTT Mitochondrial reductase Formazan Application: Measurement of cell proliferation in response to growth factors, cytokines, mitogens, and nutrients, etc. Analysis of cytotoxic and cytostatic compounds such as anticancer drugs, toxic agents and other pharmaceuticals. Assessment of physiological mediators and antibodies that inhibit cell growth. ab MTT Cell Proliferation Assay Kit 1
4 2. Protocol Summary Grow cells and treat as desired Discard media and add serum-free media and MTT reagent Incubate cells at 37 C for 3 hours Add MTT Solvent Shake on an orbital shaker for 15 minutes Measure absorbance at OD590 nm Determine change as percentage of control after background subtraction ab MTT Cell Proliferation Assay Kit 2
5 3. Precautions Please read these instructions carefully prior to beginning the assay. All kit components have been formulated and quality control tested to function successfully as a kit. We understand that, occasionally, experimental protocols might need to be modified to meet unique experimental circumstances. However, we cannot guarantee the performance of the product outside the conditions detailed in this protocol booklet. Reagents should be treated as possible mutagens and should be handled with care and disposed of properly. Please review the Safety Datasheet (SDS) provided with the product for information on the specific components. Observe good laboratory practices. Gloves, lab coat, and protective eyewear should always be worn. Never pipette by mouth. Do not eat, drink or smoke in the laboratory areas. All biological materials should be treated as potentially hazardous and handled as such. They should be disposed of in accordance with established safety procedures. 4. Storage and Stability Store kit at -20 C in the dark immediately upon receipt. Kit has a storage time of 1 year from receipt. Refer to list of materials supplied for storage conditions of individual components. Observe the storage conditions for individual prepared components in the Materials Supplied section. Aliquot components in working volumes before storing at the recommended temperature. ab MTT Cell Proliferation Assay Kit 3
6 5. Limitations Assay kit intended for research use only. Not for use in diagnostic procedures. Do not mix or substitute reagents or materials from other kit lots or vendors. Kits are QC tested as a set of components and performance cannot be guaranteed if utilized separately or substituted. 6. Materials Supplied Item Quantity Storage temperatur e (before prep) Storage temperatur e (after prep) MTT Reagent 50 ml -20 C -20 C MTT Solvent 150 ml -20 C -20 C ab MTT Cell Proliferation Assay Kit 4
7 7. Materials Required, Not Supplied These materials are not included in the kit, but will be required to successfully perform this assay: Microplate reader capable of measuring absorbance at OD 590 nm Pipettes and pipette tips, including multi-channel pipette Tubes for the preparation of reagents and buffer solutions 96 well plate with clear flat bottom General cell culture supplies Materials and instrumentation necessary to work under sterile conditions Foil ab MTT Cell Proliferation Assay Kit 5
8 8. Technical Hints This kit is sold based on number of tests. A test simply refers to a single assay well. The number of wells that contain sample, control or standard will vary by product. Review the protocol completely to confirm this kit meets your requirements. Please contact our Technical Support staff with any questions. Selected components in this kit are supplied in surplus amount to account for additional dilutions, evaporation, or instrumentation settings where higher volumes are required. They should be disposed of in accordance with established safety procedures. Avoid foaming or bubbles when mixing or reconstituting components. Avoid cross contamination of samples or reagents by changing tips between sample reagent additions. Ensure plates are properly sealed or covered during incubation steps. Ensure all reagents and solutions are at the appropriate temperature before starting the assay. Make sure all necessary equipment is switched on and set at the appropriate temperature. ab MTT Cell Proliferation Assay Kit 6
9 9. Reagent Preparation Briefly centrifuge small vials at low speed prior to opening. 9.1 MTT Reagent (50 ml): Ready to use as supplied. Equilibrate to room temperature before use and open vial under sterile conditions. Aliquot reagent so that you have enough volume to perform the desired number of assay. Store at -20 C, protected from light. 9.2 MTT Solvent (150 ml): Ready to use as supplied. Equilibrate to room temperature before use. Store at -20 C. Once opened, use within 2 months. ab MTT Cell Proliferation Assay Kit 7
10 10. Assay Procedure Equilibrate all materials and prepared reagents to room temperature prior to use. We recommend that you assay all controls and samples in duplicate. Culture conditions such as age of the culture, number of passages, and growth media can affect the result and must be taken into consideration when analyzing the data. Note Serum or phenol red present in the culture medium can generate background. If your sample contains serum or phenol red, set up Sample Background Controls Grow cells at varying densities (1-5 x10 6 cells per ml) in a clear plate according to the desired protocol. Note: Cells seeded at densities between 5,000-10,000 cells/well should reach optimal population densities within hours. We recommend using appropriate incubation time depending on the individual cell type and cell concentration used If treating cells, dissolve compounds of interest in an appropriate solvent and treat cells with compound for desired time period. Note: Prepare parallel well(s) as solvent control and use same volume of solvent as for the treated cells Discard treatment media: For adherent cells, carefully aspirate the media For suspension cells, spin the 96 well plate at 1,000 X g, 4 C for 5 minutes in a microplate-compatible centrifuge and carefully aspirate the media Add 50 µl of serum-free media and 50 µl of MTT Reagent into each well. Note: Background control wells: 50 µl MTT Reagent + 50 µl cell culture media (no cells) 10.5 Incubate the plate at 37 C for 3 hours After incubation, add 150 µl of MTT Solvent into each well Wrap the plate in foil and shake on an orbital shaker for 15 minutes Read absorbance at OD = 590 nm. ab MTT Cell Proliferation Assay Kit 8
11 11. Data Analysis CELL PROLIFERATION ASSAYS Average the duplicate reading for each sample. Subtract the culture medium background from your assay reading. This is the corrected absorbance. Amount of absorbance is proportional to cell number. Note: for cell counting, a standard curve can be established with known cell number and fixed incubation times with the assay reagent. CELL CYTOTOXICITY ASSAYS Average the duplicate reading for each sample. Subtract the culture medium background from your assay readings. This is the corrected absorbance. Calculate percentage cytotoxicity with the following equation, using corrected absorbance: % Cytotoxicity = (100 x (Control Sample)) Control ab MTT Cell Proliferation Assay Kit 9
12 12. Typical Data Figure 1. HeLa cells were grown in DMEM media supplemented with 10% FBS, harvested using trypsin and counted using Trypan blue and a hemocytometer. Cells were then serially diluted in a clear cell culture plate and incubated for 3 hours with MTT Reagent at 37 C. After incubation, cells were treated with MTT Solvent for 15 minutes at room temperature. Absorbance was measured at OD = 590 nm. Inset graph is an expanded segment of the assay data at lower cell number per well. ab MTT Cell Proliferation Assay Kit 10
13 13. Troubleshooting Problem Reason Solution Assay not working Unanticipated results Use of ice-cold reagent Plate read at incorrect wavelength Measured at incorrect wavelength Warm reagent to assay temperature Check equipment and filter settings of instrument Check equipment and filter settings of instrument ab MTT Cell Proliferation Assay Kit 11
14 14. Interferences These chemical or biological materials will cause interferences in this assay causing compromised results or complete failure: Serum or phenol red present in the cell culture media. ab MTT Cell Proliferation Assay Kit 12
15 15. Notes ab MTT Cell Proliferation Assay Kit 13
16 Technical Support Copyright 2017 Abcam, All Rights Reserved. The Abcam logo is a registered trademark. All information / detail is correct at time of going to print. Austria wissenschaftlicherdienst@abcam.com France supportscientifique@abcam.com Germany wissenschaftlicherdienst@abcam.com Spain soportecientifico@abcam.com Switzerland technical@abcam.com Deutsch: Français: UK, EU and ROW technical@abcam.com +44(0) Canada ca.technical@abcam.com US and Latin America us.technical@abcam.com Asia Pacific hk.technical@abcam.com (852) China cn.technical@abcam.com Japan technical@abcam.co.jp +81-(0) Singapore sg.technical@abcam.com Australia au.technical@abcam.com +61-(0) New Zealand nz.technical@abcam.com +64-(0) Copyright 2018 Abcam. All rights reserved
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