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Biochem Biophys Res Commun. 1997 Jan 13;230(2):258-61.

Pulsatile Ca2+ influx in human neutrophils undergoing CD11b/CD18 integrin engagement.

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Department of Surgery, University of Wales College of Medicine, Heath Park, Cardiff, United Kingdom.


Rapid-time confocal scanning has demonstrated that neutrophils undergoing CDllb/CD18 integrin-dependent adhesion show repeated elevations in cytosolic free Ca2+ concentration, due to Ca2+ influx. The magnitude of each individual influx, compared to the previous one, depended upon the time between the two, and not upon the cytosolic Ca2+ concentration at the start of the influx. Influx events occurring less than 100 seconds after the previous Ca2+ rise were observed not to reach the concentration of the preceding peak, whilst events occurring later usually exceeded the magnitude of the previous Ca2+ concentration. This suggested temporary inactivation, followed by recovery, of the Ca2+ influx mechanism. In addition, Ca2+ influx was most likely to occur immediately following this recovery. The involvement of Ca2+ store release at the site of integrin engagement suggested that the cytoskeletal connection between the peripheral store and membrane was facilitating the signalling of Ca2+ influx.

[Indexed for MEDLINE]

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