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. 1989 Aug 15;262(1):165–172. doi: 10.1042/bj2620165

Desensitization of calcium mobilization and cell function in human neutrophils.

G H Lee 1, J S Kaptein 1, S J Scott 1, H Niedzin 1, C I Kalunta 1, P M Lad 1
PMCID: PMC1133243  PMID: 2554882

Abstract

Neutrophils pretreated with the chemoattractant formylmethionyl-leucyl-phenylalanine become unresponsive when re-exposed to the same ligand, a process termed desensitization. We have examined whether desensitization of transduction (Ca2+ mobilization) or of other cell functions (superoxide generation, enzyme release, or aggregation) occurs synchronously. Simultaneous studies of Ca2+ mobilization and aggregation by using Fura-2-loaded cells indicate that, under conditions where the aggregation response is abolished, most of the Ca2+ mobilization is unaltered. Further studies were then carried out to ascertain whether desensitization of Ca2+ mobilization could in fact be induced. Desensitization was observed, and was dependent on the number of exposures of the cells to the ligand, the concentration of the ligand, and whether the ligand was left in the medium or was removed. The pattern of resensitization was dependent on the experimental design. Under conditions where ligand was continuously present, no recovery of the Ca2+-mobilization response was seen with subsequent challenges. In contrast, on removal of ligand, this response showed partial recovery. Whereas complete desensitization of aggregation was noted, enzyme release showed a markedly lesser degree of desensitization and required more frequent exposures to the ligand before it was observed. Little or no desensitization of superoxide generation was observed regardless of the conditions utilized. Studies using phorbol myristate acetate as the ligand showed that Ca2+ mobilization and aggregation could be simultaneously inhibited. Our results suggest that discrete mechanisms of desensitization are possible in human neutrophils, and that desensitization of one particular function (aggregation) does not imply concomitant desensitization of other functions.

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Selected References

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