Cell cytotoxicity / Proliferation assay cell type - MDA-MB-231 breast adenocarcenoma

Cell cytotoxicity assays measure the ability of certain compounds or chemical mediators to reduce the viability of the cells. The term cell cytotoxicity assay can sometimes be used interchangeably with cell proliferation assay. Healthy living cells can be identified by the use of formazan dyes, protease biomarkers or by measuring ATP content. The formazan dyes are chromogenic products formed by the reduction of tetrazolium salts by dehydrogenases, such as lactate dehydrogenase (LDH) and reductases that are released during cell death. Common tetrazolium salts include INT, MTT, MTS and XTT. Cell cytotoxicity can also be measured by using the SRB and WST-1 assays. These assays can usually be used in a high-throughput fashion and can be quantitated by measuring absorbance, colorimetry or luminescence. All these assays require similar numbers of cell plating at the initiation, a time course of treatment with the cytotoxic agent and at least triplicates for each condition at every point of analysis. Cell shrinkage, plasma membrane blebbing, cell detachment, externalization of phosphatidylserine, nuclear condensation and ultimately DNA fragmentation are well-described features of apoptosis. The assays that rely on cell membrane integrity for their function, may not be able to quantify early apoptosis. Therefore, in order to distinguish early apoptotic vs. late apoptotic or necrotic cells, additional flow cytometry techniques can be used. A combination of Annexin V and PI (propidium iodide) can be used to distinguish early (Annexin V+/PI-) and late apoptotic (Annexin V+/PI+) cells. Sometimes, caspase assays are used in order to differentiate the stages of apoptosis.

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Found 3 matching solutions for this experiment

Upstream tips
- Cells were seeded at a cell density of 1×105 cells/ml.
Protocol tips
- Seeded cells were treated with insulin (25 nM) for 24h.

- Cells were incubated with BrdU for 24 h.
Downstream tips
- The absorbance was measured at a dual wavelength of 450–540 nm
Upstream tips
- Cells were seeded at a density of 1 × 104 cells/well of 96-well plates containing DMEM with 10% FBS
Protocol tips
- Cells were treated with BrdU solution 3h before the assay
Protocol tips
- Plate was incubated at 37ºC for 4 hours and then quantifiably measured at a wavelength of 570 nm.
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