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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
Thrombosis Research
|July 4, 2001
Summary
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.