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A multi-color flow cytometric method for characterizing murine reticulated platelets using SYTO 13
Muataz Ali Hamad1,2,3,4, Krystin Krauel1,4,5, Nancy Schanze1,4,5
1Department of Cardiology and Angiology, Heart Center, Faculty of Medicine, University of Freiburg, Freiburg im Breisgau, Germany.
Platelets
|April 28, 2025
Summary
Reticulated platelets (RP), immature cells with high RNA, indicate disease. A new SYTO 13 flow cytometry method effectively detects RP in mice, showing higher levels during recovery and increased activation markers upon stimulation.
Area of Science:
- Hematology
- Immunology
- Flow Cytometry
Background:
- Reticulated platelets (RP) are immature platelets characterized by elevated RNA content.
- Increased circulating RP levels are linked to various pathological conditions.
- Accurate detection of RP is crucial for understanding platelet kinetics and disease states.
Purpose of the Study:
- To develop and validate a novel flow cytometry method for detecting reticulated platelets (RP) in mice.
- To characterize murine RP, including their activation status and response to stimulation.
- To establish a tool for simultaneous monitoring of RP levels and platelet activation in murine disease models.
Main Methods:
- Utilized a novel flow cytometry approach employing the nucleic acid dye SYTO 13 and an anti-mouse CD42b antibody.
- Quantified circulating RP levels in platelet-depleted, recovering mice versus untreated controls.
- Assessed P-selectin expression and geometric mean fluorescence intensity on RP and non-RP following stimulation with a thrombin receptor agonist (PAR-4).
Main Results:
- The SYTO 13 method successfully identified higher circulating RP levels in recovering mice (35%) compared to controls (11%).
- Stimulated RP showed a significantly higher percentage of P-selectin-positive platelets (93%) than non-RP (77%).
- RP exhibited higher geometric mean fluorescence intensity than non-RP, indicating distinct cellular properties.
Conclusions:
- The SYTO 13-based flow cytometry method is effective for identifying reticulated platelets (RP) in mice.
- This method allows for the assessment of RP activation status, differentiating them from mature platelets.
- The technique provides a promising tool for studying platelet dynamics in murine models relevant to human diseases.
