An improved method for the isolation of eosinophilic granulocytes from peripheral blood of normal individuals

A simple and improved procedure is described for the isolation of human eosinohils from normal individuals with about 2% eosinophils in their peripheral blood. This method comprises a preincubation of a mixed granulocyte preparation with 10 nM fMLP for 10 min at 37°C followed by a one-step density centrifugation on isotonic Percoll. The recovery of eosinophils is 49 ± 4% at 89 ± 4% purity. Because of the relatively high rate of recovery, it is now possible to isolate eosinophils from blood samples as small as 20 ml. Because treatment with fMLP may alter the functional activity of the eosinophils, the following metabolic functions were tested: changes in cytosolic free Ca²⁺, oxygen consumption, chemiluminescence, chemotaxis, and leukotriene C4 formation. We found that 10 nM fMLP does not activate eosinohils in these assays, whereas 1 μM fMLP does (with the exception of chemotaxis). Furthermore, pretreatment of eosinophils with 10 nM fMLP did not influence the response to other stimuli in these assays. The usefulness of this method was evaluated by comparing it with three other previously described procedures. In our hands, only the method presented here enabled us to isolate eosinophils from normal individuals with about 2% eosinophils in their peripheral blood.