Activation of K+ current in macrophages by platelet activating factor. |
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Authors: | M Ichinose N Hara M Sawada T Maeno |
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Institution: | Department of Physiology, Shimane Medical University, Izumo, Japan. |
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Abstract: | Puff application of platelet activating factor (10(-8) M) onto peritoneal macrophages from thioglycollate-stimulated mice induced an outward current at a holding potential of -63 mV. The current was suppressed by an antagonist Y-24180 but not by CV-3988. Charybdotoxin (10(-6) M) suppressed the current. Reversal potentials were dependent on external K+ concentrations. The current was not suppressed in Ca(2+)-free EGTA-containing solution but was completely abolished in BAPTA-AM containing solution. These results suggest that platelet activating factor activates a Ca(2+)-dependent K+ channel. |
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