Effects of cytokines on human basophil chemotaxis

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Abstract
Summary: Basophil chemotactic activity (BCA) of eight recombinant human (rh) cytokines was examined. Highly purified basophils were obtained by Percoll discontinuous gradients, followed by negative selection using flow cytometry. Then BCA was measured by means of modified Boyden chamber method. Both interleukin (IL)‐3 and granulocyte‐macrophage colony‐stimulating factor (GM‐CSF) had much more potent BCA than complement C5a, leukotriene B4 and platelet activating factor, well known as granulocyte chemotactic factors. Chemotaxis rather than chemokinesis was shown in chequerboard analysis of basophil migration induced by IL‐3 and GM‐CSF. Relatively high concentrations of IL‐5 also induced basophil migration, although predominantly chemokinetic. IL‐8 had apparent BCA, which was not so high as that of C5a. In contrast, IL‐2, IL‐4, interferon(IFN)‐γ and granulocyte colony‐stimulating factor (G‐CSF) had no significant BCA. These findings suggest that IL‐3, IL‐5, GM‐CSF and, perhaps, IL‐8 have an effect on basophil migration as well as modulation of basophil mediator release and may provide some insight into the basophil accumulation observed in late‐phase allergic responses.