Multiple non-aggregatory functions of human platelets (PLT) are widely acknowledged, yet their functional examination is limited mainly due to a lack of standardized isolation and analytic methods. Platelet apheresis (PA) is an established clinical method for PLT isolation aiming at the treatment of bleeding diathesis in severe thrombocytopenia. On the other hand, density gradient centrifugation (DC) is an isolation method applied in research for the analysis of the mitochondrial metabolic profile of oxidative phosphorylation (OXPHOS) in PLT obtained from small samples of human blood. We studied PLT obtained from 29 healthy donors by high-resolution respirometry for comparison of PA and DC isolates. ROUTINE respiration and electron transfer capacity of living PLT isolated by PA were significantly higher than in the DC group, whereas plasma membrane permeabilization resulted in a 57% decrease of succinate oxidation in PA compared to DC. These differences were eliminated after washing the PA platelets with phosphate buffer containing 10 mmol·L-1 ethylene glycol-bis (2-aminoethyl ether)-N,N,N',N'-tetra-acetic acid, suggesting that several components, particularly Ca2+ and fuel substrates, were carried over into the respiratory assay from the serum in PA. A simple washing step was sufficient to enable functional mitochondrial analysis in subsamples obtained from PA. The combination of the standard clinical PA isolation procedure with PLT quality control and routine mitochondrial OXPHOS diagnostics meets an acute clinical demand in biomedical research of patients suffering from thrombocytopenia and metabolic diseases.

3rd Department of Internal Medicine Metabolic Care and Gerontology University Hospital Hradec Kralove Sokolska 581 500 05 Hradec Kralove Czech Republic

4th Department of Internal Medicine Hematology University Hospital Hradec Kralove Sokolska 581 500 05 Hradec Kralove Czech Republic

D Swarovski Research Laboratory Department of General and Transplant Surgery Medical University of Innsbruck Christoph Probst Platz 1 Innrain 52 A 6020 Innsbruck Austria

Department of Analytical Chemistry Faculty of Pharmacy in Hradec Kralove Charles University Akademika Heyrovskeho 1203 8 500 05 Hradec Kralove Czech Republic

Department of Clinical Biochemistry and Diagnostics University Hospital Hradec Kralove Sokolska 581 500 05 Hradec Kralove Czech Republic

Department of Clinical Immunology and Allergology University Hospital Hradec Kralove Sokolska 581 500 05 Hradec Kralove Czech Republic

Oroboros Instruments GmbH Schoepfstrasse 18 A 6020 Innsbruck Austria

Transfusion Department University Hospital Hradec Kralove Sokolska 581 500 05 Hradec Kralove Czech Republic

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