Measurement of phagocyte chemiluminescence in a microtitre plate format.

Previously described assays of phagocyte chemiluminescence have required large numbers of cells and have not been able to follow responses from a large number of samples in single experiments. Recently, sensitive luminometers which employ a 96 well microtitre plate format have become available. We describe the application of this equipment to the measurement of phagocyte chemiluminescence using lucigenin to enhance the response and the estimation of the opsonic activity of serum. It was found that as few as 5 X 10(4) cells (polymorphonuclear leukocytes or monocytes) per well and a ratio of 10:1 zymosan particles to cells gave good results when opsonised with 10% whole serum. This method allows assays of opsonic activity to be performed in triplicate on large numbers of sera with a relatively small number of phagocytes and should aid the investigation of the role of opsonisation in infectious disease.