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Updated: Jul 4, 2026

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
Published on: November 29, 2024
Quantitative and real-time detection of secretion of chemical messengers from individual platelets
Shencheng Ge1, Nathan J Wittenberg, Christy L Haynes
1Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Abstract:
Carbon-fiber microelectrochemical methods were utilized in this study to measure individual exocytotic events of secretion of serotonin and histamine from washed rabbit platelets. The quantal release of serotonin was quantitatively characterized with a delta-granule serotonin concentration of 0.6 M and secretion time course of 7 ms. Additionally, extracellular osmolarity influences quantal size, causing quantal size increases under hypotonic conditions, presumably due to the influx of cytosolic serotonin into the halo region of the delta-granules.

