title: Computer-assisted monocyte esterase assay by flow-cytophotometry.
abstract: A Wang model 2200 computer has been interfaced with the Bio/Physics Systems, Inc. model 6300 Cytograf and model 2100 Distribution Analyzer. Using a custom designed software program, in conjunction with an azo-dye technic for staining monocytes for nonspecific esterase activity, it has been possible to obtain rapid and reliable data concerning relative values for intracellular monocyte esterase activity. The method is based on measuring the axial light-loss voltage signal for each of one thousand stained monocytes. Individual stained monocytes were assigned to one of four groups (A, B, C, D), dependent upon the magnitude of the signal and were given different rating values (1, 2, 3, 4) according to their group designation. A "score" was derived for each blood sample by multiplying the percentage of cells (monocytes) in each group category by the appropriate factor and summing these values. The technic permits rapid objective assessment of intracellular nonspecific esterase activity in monocytes suspended in a mixed cell population. Both Gaussian and bi-modal patterns for monocyte esterase were observed. The latter suggests a dual monocyte population.
mesh_terms: D003201:Computers; D004950:Esterases / Q000378:metabolism*; D006801:Humans; D008722:Methods; D009000:Monocytes / Q000201:enzymology*; D010783:Photometry; D013194:Staining and Labeling
chemical_list: D004950:Esterases