Abstract
HL-60 cells differentiate into mature granulocytes in response to treatment with a variety of chemical agents. Such HL-60 cell derived granulocytes display many of the properties associated with their peripheral blood counterpart. In this study we have investigated the development of the degranulation response in dimethylsulfoxide (DMSO) or retinoic acid differentiated HL-60 cells over a six day period. The release of a number of enzymes in response to stimulation by a variety of agents was examined. Soluble aggregated IgG (SAIgG) stimulated the release primarily of elastase from HL-60 derived granulocytes with little or no release of other granule enzymes, in particular myeloperoxidase. This contrasted to what was seen when peripheral blood granulocytes were used. The lack of myeloperoxidase release was not due to the parallel release of enzyme inhibitors or failure of the stimulus to bind to the cells. Neither was it due to variations in the kinetics of enzyme release or the presence of myeloperoxidase and elastase in discrete sub-populations of HL-60 cells. When other stimuli such as fMet-Leu-Phe, A23187, or phorbol myristate acetate (PMA) were used a relatively normal degranulation response was seen. Thus, the degranulation response in granulocytes derived from HL-60 cells appears relatively normal when a range of commonly used stimuli are used but is impaired when aggregates of IgG are used.
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