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Evaluation of platelet turnover by flow cytometry
G L Salvagno1, M Montagnana, M Degan
1Department of Morphological-Biomedical Sciences, Policlinico GB Rossi, Verona, Italy.
Platelets
|May 17, 2006
Summary
Thiazole orange (TO) flow cytometry effectively measures reticulated platelets (RPs), indicating platelet turnover. This method aids in diagnosing thrombocytopenia and predicting recovery after chemotherapy.
Area of Science:
- Hematology
- Clinical Pathology
- Biotechnology
Background:
- Platelet production and removal determine circulating platelet counts.
- Reticulated platelets (RPs) with high RNA content serve as an index of platelet turnover.
- Flow cytometry with thiazole orange (TO) can quantify RPs.
Purpose of the Study:
- To assess the specificity of TO flow cytometry for measuring RPs.
- To apply TO flow cytometry in diagnosing thrombocytopenia due to impaired production or increased destruction.
- To evaluate TO flow cytometry's utility in predicting recovery from chemotherapy-induced bone marrow aplasia.
Main Methods:
- Venous blood samples were collected in K(2)EDTA.
- Samples were incubated with thiazole orange (TO) and an anti-GPIIIa antibody.
- Flow cytometry was used to quantify TO-positive RPs.
Main Results:
- Control subjects showed a mean RP percentage of 6.13 ± 3.09%.
- Patients with hematological malignancies during aplasia had 10.41 ± 9.02% RPs, increasing to 35.45 ± 6.11% during recovery.
- Elevated RP percentages were observed in idiopathic thrombocytopenic purpura (67.81 ± 18.79%), hepatic cirrhosis (21.04 ± 16.21%), and systemic lupus erythematosus (29.08 ± 15.57%).
Conclusions:
- TO flow cytometry is a reliable tool for identifying platelet disorders.
- This method offers higher sensitivity than platelet volume measurement for diagnosing thrombocytopenia.
- RP measurement aids in recognizing the pathogenetic mechanisms of thrombocytopenia.