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ACT 1™
Assay for CytoToxicity
A non-radioactive cytotoxicity assay for flow cytometry
Key Benefits:
  • No radioactive materials required
  • Applications - Works with a flow cytometer or fluorescence microscope
  • Detects cytolytic activity at a cellular level
  • Works with multiple types of mammalian cell lines
Technology:
The most commonly used method to measure CMC/ADCC is a radioactive chrominum-51 (51Cr) release assays (2). There are several disadvantages with this assay: it is expensive, difficult to load certain cell types, expensive to dispose of due to strict environmental regulations, and has high background from spontaneous release of 51Cr. With the use of flow cytometry, it is now possible to eliminate the need for radioactive material and increase the ability to quantify cytolytic activity on a single cell bases. Various groups have demonstrated that measuring CMC/ADCC activity by flow cytometry has a strong (95%) correlation with the traditional 51Cr release assay (3,4,5,6).
Assay Principle :
A cell tracking dye CFSE ( 7,8,9) is utilized to label the target cell population. After the assay has run its experimental protocol, 7AAD (live/dead) (10,11) is added to measure cell death. 7AAD only enters membrane-compromised cells and binds to DNA.

Flow cytometry is utilized to gate on the target cells and measure 7AAD negative vs 7AAD postitve cells. % cytotoxicity is calculated by the following equation (see experimental example below):

7AAD positive (upper right quadrant)=R1/ 7AAD Postitve (upper right quadrant)= R1 + 7AAD negative (lower right quadrant)=R2 x100

Kit contents:
  • 4 vials of CFSE membrane stain, part no 4002.
  • 3 vials of 7AAD Live/Dead stain, part no 4003.
The following kit is available:
Product
 
Catalog No.
 
Size
(No. of Tests)
Price
ACT 1
Assay for CytoToxicity

 
ACT100-2 100 $275