A variety of methods have been developed to measure cell proliferation in whole population of cells. One method quantifies the reducing environment of the cells. It relates to the fact that metabolizing cells maintain a reducing environment within their cytosol and this reduced state can be measured spectrophotometrically through the conversion of fluorometric/colorimetic redox indicators such as alamarBlue®.
The assay was tested in human osteoblast cells (HOb 406-05a) grown on two substrates. Cell viability was assessed every 24-36 h over a culture period of 17 days. Cells were incubated with the alamarBlue® dye for 4 h before exchanging the medium and measurement of the fluorescent signal by the BMG LABTECH microplate reader.
The nontoxic reagent in combination with the stable measurements of the reader allowed for continuous monitoring of cell viability and revealed differences in the suitability of two differing culturing substrates.