Term information
The effective concentration of a growth inhibitor, which produces 50% of the maximum possible response for that inhibitor. GI50 is calculated from [(Ti-Tz)/(C-Tz)] x 100 = 50, where Tz is absorbance at time zero, Ti is absorbance in the presence of test drug, and C is absorbance in the control (untreated cells). As a measure of viable or proliferating cells, different researchers measure different parameters, namely, protein content (by sulforhodamine B staining followed by absorbance measurement), mitochondrial dehydrogenase activity (by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrasodium bromide, known as MTT staining followed by absorbance measurement), expression of proliferation associated antigens (by immunostaining for Ki-67), and ATP content (by using CellTiter-Glo reagent (Promega) followed by luminescence measurement).
Term relations
- concentration response endpoint and has mode of action some growth inhibition and has percent response some 50 percent growth inhibition and based on normalization some percent inhibition normalization and has mode of action only growth inhibition and has percent response only 50 percent growth inhibition and based on normalization only percent inhibition normalization