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Activation of a potassium outward current by zymosan and opsonized zymosan in mouse peritoneal macrophages

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Abstract

The effects of zymosan and human serum opsonized zymosan on membrane currents of adherent mouse peritoneal macrophages which had been cultured for 5 to 20 days were investigated with the whole-cell voltage-clamp technique. Both stimuli activated an outward current. The outward current activation was transient and lasted about 5 min. In solutions with 10 or 50 mmol/l extracellular potassium concentration the activation of an outwardly directed current occurred at test potentials positive to the respective potassium equilibrium potential. This particle-induced current resembled a calciu-mactivated potassium current which could be activated with the calcium ionophore A 23187 and with platelet activating factor. The order of maximal responses (test potential +55 mV, amplitude given as percentage of the respective control) was: 0.1 μmol/l platelet activating factor (222±36%,n=8,P<0.01) > 1 μmol/l A 23187 (190±24%,n=11,P<0.01) >900 μg/ml opsonized zymosan (134±7%,n=22,P<0.01) >900 μg/ml zymosan (116±5%,n = 21,P<0.01) The lower efficiency of zymosan as compared to opsonized zymosan is explained in part by a lower percentage of responding cells which was 48% for zymosan and 73% for opsonized zymosan. Macrophages which were pretreated with particles showed a greater reactivity to calcium as compared to untreated cells. Elevation of extracellular calcium from 0.9 to 4.5 mmol/l activated the outward current to 145±12% (n = 11,P< 0.01) after preincubation with opsonized zymosan and to 144±21% (n = 12,P< 0.01) under the influence of zymosan while in untreated cells current increase by elevation of extracellular calcium was not significant (120±10%,n = 9, n.s.).

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Authors and Affiliations

  1. Institut für Pharmakologie, Heinrich-Heine-Universität Düsseldorf, Moorenstrasse 5, D-40225, Düsseldorf, Germany

    F. Berger, U. Borchard, D. Hafner & T. Weis

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  1. F. Berger
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  2. U. Borchard
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  3. D. Hafner
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  4. T. Weis
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Correspondence to: U. Borchard at the above address

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Berger, F., Borchard, U., Hafner, D. et al. Activation of a potassium outward current by zymosan and opsonized zymosan in mouse peritoneal macrophages. Naunyn-Schmiedeberg's Arch. Pharmacol. 349, 594–601 (1994). https://doi.org/10.1007/BF01258465

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  • DOI: https://doi.org/10.1007/BF01258465

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