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Updated: Oct 5, 2026
Routine Screening Method for Microparticles in Platelet Transfusions
Published on: January 31, 2018
Assessment of in vitro-generated platelet microparticles using a modified flow cytometric strategy
E V Tocchetti1, R L Flower, J V Lloyd
1Division of Haematology, Institute of Medical and Veterinary Science, PO Box 14, Rundle Mall, SA 5000, Adelaide, Australia. rick.tocchetti@imvs.sa.gov.au
Abstract:
Quantification of platelet microparticles (PMPs) may be a useful marker for the detection of in vivo platelet activation. Optimisation of flow cytometric methods for detection and quantification of PMPs has not been systemically evaluated. This study reports the optimisation of flow cytometric procedures for the detection of PMPs, the determination of limits of size detection using microbeads, and the characterisation of PMP generation by in vitro activation of platelets using collagen and adenosine 5' diphosphate (ADP). Fluorescent and plain microbeads proved useful for defining the limits of the flow cytometer in detecting PMPs. A systematic calibration of the forward scatter (FS) threshold parameter (size) of the flow cytometer using microbeads allowed for the detection of very small particles (down to 0.1 microm diameter). PMPs generated in vitro using ADP and collagen were reliably detected by flow cytometry using monoclonal antibodies (MAb) directed towards platelet surface membrane glycoproteins (Gp). The PMP events were detected in the FS low (i.e., small size events) and fluorescence (FL) high (i.e., platelet Gp MAb-labelled events) region. PMPs of different size profiles were observed for each of the agonists. Flow cytometry can be used as a tool in the assessment of PMPs. As detection of particles of this type is at the limit of resolution of flow cytometers, careful attention is required with the choice of platelet-specific MAb, isotype control, and optimisation of procedure setup and performance.
Insights
Flow cytometry can quantify platelet microparticles (PMPs), indicating platelet activation. This study optimized flow cytometry methods for PMP detection and size determination, crucial for diagnostic applications.
Area of Science:
- Hematology
- Biotechnology
- Analytical Chemistry
Background:
- Platelet microparticles (PMPs) are potential biomarkers for in vivo platelet activation.
- Systematic evaluation of flow cytometric methods for PMP detection and quantification is lacking.
Purpose of the Study:
- To optimize flow cytometry procedures for PMP detection and quantification.
- To determine the size detection limits of flow cytometry for PMPs using microbeads.
- To characterize PMP generation in vitro using collagen and adenosine 5' diphosphate (ADP).
Main Methods:
- Utilized fluorescent and plain microbeads to define flow cytometer detection limits for PMPs.
- Calibrated the forward scatter (FS) threshold for precise size detection down to 0.1 micrometers.
- Employed monoclonal antibodies (MAb) against platelet glycoproteins (Gp) for PMP detection via flow cytometry.
Main Results:
- Microbeads successfully established flow cytometer size detection limits.
- Optimized flow cytometry reliably detected PMPs generated in vitro by ADP and collagen.
- PMP events were characterized by low forward scatter (small size) and high fluorescence (MAb-labeled).
- Different agonists (ADP, collagen) produced PMPs with distinct size profiles.
Conclusions:
- Flow cytometry is a viable tool for assessing PMPs.
- Careful optimization of MAb selection, isotype controls, and procedural setup is essential for accurate PMP detection at the limits of flow cytometer resolution.
