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. 1992 Apr 15;283(Pt 2):379–383. doi: 10.1042/bj2830379

Spiking in cytosolic calcium concentration in single fibrinogen-bound fura-2-loaded human platelets.

J W Heemskerk 1, J Hoyland 1, W T Mason 1, S O Sage 1
PMCID: PMC1131044  PMID: 1575681

Abstract

Fura-2-loaded human platelets were immobilized on a fibrinogen-coated surface and the cytosolic free calcium concentration ([Ca2+]i) was measured in single platelets by low-light-level video-ratio image-processing of the optical probe signal. Some fibrinogen-bound platelets showed repetitive spiking in [Ca2+]i with a mean frequency of about 2/min, which increased to 5/min in the presence of ADP. Other cells showed no activity until the addition of agonist. When immobilized in the presence of prostaglandin I2 and the fibrinogen antagonist Arg-Gly-Asp-Ser, the platelets adhered less firmly to fibrinogen, and in many [Ca2+]i remained low and constant. Subsequent activation of such platelets with ADP evoked oscillations in [Ca2+]i with a peak frequency of about 5/min and which persisted for at least 5 min. These results indicate that human platelets, like many other non-excitable cells, have an elaborate system of calcium signalling involving spiking.

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Selected References

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