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Updated: Sep 23, 2026
Routine Screening Method for Microparticles in Platelet Transfusions
Published on: January 31, 2018
Analysis of individual platelet-derived microparticles, comparing flow cytometry and capillary electrophoresis with
Guohua Xiong1, Omer Aras, Arun Shet
1Department of Chemistry, Institute of Technology, University of Minnesota, Minneapolis, MN 55455, USA.
Abstract:
Platelet-derived microparticles (PMPs) formed by vesiculation during platelet activation seem to play a role in blood coagulation and in pathological disease states. Flow cytometry is currently the gold standard to characterize platelets and PMPs. Using this technique we distinguished between platelets and PMPs based on size and the presence of phosphatidyl serine (PS); PMPs were arbitrarily defined to be smaller than one micrometer and capable of forming a stable complex with fluorescently-labeled Annexin V, a protein that forms a calcium-dependent complex with PS. Further confirmation of PMP and platelet identity was done by use of fluorescently-labeled antibodies against CD41a, a glycoprotein found on the surface of both platelets and PMPs. In this report we also introduce the use of capillary electrophoresis with post-column laser-induced fluorescence detection (CE-LIF) for the analysis of fluorescently labeled platelets and PMPs. While both flow cytometry and CE-LIF can measure individual fluorescent events, only CE-LIF allowed us to calculate individual electrophoretic mobilities of activated platelets and PMPs that were then represented as distributions. A comparison between distributions suggests that PMPs have less negative mobilities. The fact that activated platelet preparations include PMPs partially obscure the interpretation of the data. While PMP and platelet number ml(-1) determined by flow cytometry is lower than the same parameter determined by CE-LIF, signal-to-noise ratio was 20 fold better for flow cytometry than for CE-LIF. This is the first time that a direct comparison between these two techniques is reported.
Insights
Platelet-derived microparticles (PMPs) and platelets were analyzed using flow cytometry and capillary electrophoresis. CE-LIF revealed distinct electrophoretic mobilities for PMPs, offering new insights into their characterization.
Area of Science:
- Hematology
- Biophysical Chemistry
- Analytical Chemistry
Background:
- Platelet-derived microparticles (PMPs) are implicated in blood coagulation and disease.
- Flow cytometry is the standard for characterizing platelets and PMPs.
- PMPs are vesicles formed during platelet activation, distinguished by size and phosphatidyl serine (PS) exposure.
Purpose of the Study:
- To introduce and evaluate capillary electrophoresis with laser-induced fluorescence detection (CE-LIF) for analyzing platelets and PMPs.
- To directly compare CE-LIF with flow cytometry for platelet and PMP characterization.
- To investigate differences in electrophoretic mobility between platelets and PMPs.
Main Methods:
- Characterization of platelets and PMPs using flow cytometry based on size and Annexin V/CD41a staining.
- Analysis of fluorescently labeled platelets and PMPs using CE-LIF.
- Calculation and comparison of individual electrophoretic mobility distributions for platelets and PMPs.
Main Results:
- CE-LIF enabled calculation of individual electrophoretic mobilities, distinguishing PMPs from platelets.
- PMPs exhibited less negative electrophoretic mobilities compared to activated platelets.
- Flow cytometry provided a better signal-to-noise ratio, but CE-LIF offered more detailed mobility data.
Conclusions:
- CE-LIF is a valuable technique for characterizing PMPs and platelets, providing insights into their biophysical properties.
- Direct comparison highlights complementary strengths of flow cytometry and CE-LIF.
- Understanding PMP characteristics is crucial for elucidating their roles in hemostasis and disease.
