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Published on: January 31, 2018
Analytical validation of platelet microparticle quantification in cats
Signe E Cremer1, Jørgen Koch1, Nanna Graversen1
1Department of Veterinary Clinical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
Insights
Platelet microparticles (PMPs) can be reliably measured in cat whole blood, but concentrations did not differ between healthy cats and those with asymptomatic hypertrophic cardiomyopathy (HCM) in this pilot study.
Area of Science:
- Veterinary Medicine
- Cardiology
- Hematology
Background:
- Cardiogenic embolism (CE) in cats is a serious condition often linked to hypertrophic cardiomyopathy (HCM).
- Hypercoagulability is a risk factor for thrombus formation, but predicting CE is challenging.
- Platelet microparticles (PMPs) are implicated in thrombosis in humans.
Purpose of the Study:
- To analytically validate flow cytometric quantification of PMPs in cats.
- To assess procoagulant annexin V (AnV) positive PMP concentrations in healthy cats and cats with asymptomatic HCM.
Main Methods:
- Quantified CD61+ AnV+ PMPs (0.3-1.0 μm) using flow cytometry in whole blood (WB) and platelet-poor plasma (PPP).
- Analyzed samples from 6 healthy cats and 5 cats with asymptomatic HCM.
- Calculated intra-assay and inter-assay coefficients of variation (CV).
Main Results:
- Whole blood PMP quantification showed acceptable intra-assay CV for both CD61+ /AnV- and CD61+ /AnV+ PMPs.
- Inter-assay CV was acceptable for WB PMPs but unacceptable for PPP PMPs.
- No significant difference in WB PMP concentrations (CD61+ /AnV- or CD61+ /AnV+) was observed between healthy cats and cats with asymptomatic HCM.
Conclusions:
- Whole blood PMP quantification is reliable for cats in a clinical setting.
- This pilot study found no difference in PMP concentrations between healthy cats and those with asymptomatic HCM.
Background:
Cardiogenic embolism (CE) in cats is a devastating condition primarily associated with hypertrophic cardiomyopathy (HCM). Hypercoagulability may pose a risk for thrombus formation; however, no single test can predict CE development. Platelet microparticles (PMPs) released from platelet membranes are associated with thrombosis in humans.
Objectives:
The aims were to validate flow cytometric PMP quantification in cats analytically and, in a pilot study, evaluate the procoagulant annexin V (AnV) positive PMP concentration in healthy cats and cats with asymptomatic HCM.
Methods:
With CD61 as a platelet marker, CD61+ AnV+ PMPs (0.3-1.0 μm) were quantified in citrated whole blood (WB) and platelet-poor plasma (PPP) using flow cytometry. Analyses were performed in 6 healthy cats and 5 cats with asymptomatic HCM. The coefficient of variation (CV) for duplicate (intra-assay) and parallel (inter-assay) analyses were calculated.
Results:
PMP concentrations were quantified with acceptable intra-assay CV for WB (CD61+ /AnV- ; 2.4%, 0.2%-8.4% (median, range), CD61+ /AnV+ ; 3.8%, 0.1%-12.5%) and PPP (CD61+ /AnV- ; 5.0%, 0.7%-12.8%, CD61+ /AnV+ ; 7.4%, 0.5%-15.3%), and acceptable inter-assay CV for WB in 10/11 cats (CD61+ /AnV- ; 6.2%, 1.4%-13.3%, CD61+ /AnV+ ; 6.4%, 0.7%-17.2%), but unacceptable for PPP (CD61+ /AnV- ; 15.6%, 5.8%-42.7%, CD61+ /AnV+ ; 27.8%, 8.4%-77.1%). For WB PMP concentrations, the pilot data demonstrated no differences between healthy cats and cats with asymptomatic HCM (4/5 with left ventricular outflow obstruction) for either the CD61+ /AnV- or the CD61+ /AnV+ PMPs.
Conclusions:
Only WB PMP concentrations could be quantified reliably in cats in a clinical setting. PMP concentrations did not differ between healthy and asymptomatic HCM cats in this pilot study.
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