Abstract: (3535 Views)
In this study cellular phosphatase activity, referred to as enzyme developed
color (EDC) assay, was used for an in vitro assessment of cell proliferation and
cytotoxicity. Optimum conditions were established and found to be 10 x103 cells /
well at 37°C and 60 min incubation (for developing color). Under the same conditions
a direct correlation between optical density (00) and cell number was observed.
Thus, the ODs for a cell line, Ish at 100, 50, 25 and 10 X 103 cells/well were
1.0S ±0.05, 0.59 ±0.02, 0.33 ±0.02, and 0.17 ±0.01 respectively (r=0.995,p<0.001).
When EDC was compared with another colorimetric assay, i.e. MTT, the results
showed a direct correlation with r=0.995, p<0.001 .
Repeating the experiment with live and fixed tumor cells showed similar results.
Thus, for the Ish line, the ODs at 50 and 10 X 103 cells/well for fixed and live cells
were 0.66±0.01, 0.18±0.01 and O.64±0.03 (p>0.05), 0.19±0.01 (p>0.05),
respectively. The assay was also shown to be suitable for the measurement of cell
cytotoxicity and compared well with the MTT assay.
These findings indicated that a simple, rapid and economical EDC assay could
be used to investigate various cellular functions. The main advantage of EDC is it's
suitability to use stored cells. This provides flexibility for testing samples stored over
a long period in order to limit inter-experimental variations