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Weiss R, Mostageer M, Eichhorn T, Huber S, Egger D, Spittler A, Tripisciano C, Kasper C, Weber V. The fluorochrome-to-protein ratio is crucial for the flow cytometric detection of tissue factor on extracellular vesicles. Sci Rep 2024; 14:6419. [PMID: 38494537 PMCID: PMC10944842 DOI: 10.1038/s41598-024-56841-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Accepted: 03/12/2024] [Indexed: 03/19/2024] Open
Abstract
Extracellular vesicles (EVs) have crucial roles in hemostasis and coagulation. They sustain coagulation by exposing phosphatidylserine and initiate clotting by surface expression of tissue factor (TF) under inflammatory conditions. As their relevance as biomarkers of coagulopathy is increasingly recognized, there is a need for the sensitive and reliable detection of TF+ EVs, but their flow cytometric analysis is challenging and has yielded controversial findings for TF expression on EVs in the vascular system. We investigated the effect of different fluorochrome-to-protein (F/P) ratios of anti-TF-fluorochrome conjugates on the flow cytometric detection of TF+ EVs from activated monocytes, mesenchymal stem cells (MSCs), and in COVID-19 plasma. Using a FITC-labeled anti-TF antibody (clone VD8), we show that the percentage of TF+ EVs declined with decreasing F/P ratios. TF was detected on 7.6%, 5.4%, and 1.1% of all EVs derived from activated monocytes at F/P ratios of 7.7:1, 6.6:1, and 5.2:1. A similar decline was observed for EVs from MSCs and for EVs in plasma, whereas the detection of TF on cells remained unaffected by different F/P ratios. We provide clear evidence that next to the antibody clone, the F/P ratio affects the flow cytometric detection of TF+ EVs and should be carefully controlled.
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Affiliation(s)
- René Weiss
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria
| | - Marwa Mostageer
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria
| | - Tanja Eichhorn
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria
| | - Silke Huber
- Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, Innsbruck, Austria
| | - Dominik Egger
- Institute of Cell and Tissue Culture Technology, Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Andreas Spittler
- Core Facility Flow Cytometry & Surgical Research Laboratories, Medical University of Vienna, Vienna, Austria
| | - Carla Tripisciano
- Clinical Division of Haematology and Haemostaseology, Department of Medicine I, Medical University of Vienna, Vienna, Austria
| | - Cornelia Kasper
- Institute of Cell and Tissue Culture Technology, Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Viktoria Weber
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria.
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Eichhorn T, Weiss R, Huber S, Ebeyer-Masotta M, Mostageer M, Emprechtinger R, Knabl L, Knabl L, Würzner R, Weber V. Expression of Tissue Factor and Platelet/Leukocyte Markers on Extracellular Vesicles Reflect Platelet-Leukocyte Interaction in Severe COVID-19. Int J Mol Sci 2023; 24:16886. [PMID: 38069209 PMCID: PMC10707108 DOI: 10.3390/ijms242316886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/21/2023] [Accepted: 11/24/2023] [Indexed: 12/18/2023] Open
Abstract
Severe COVID-19 is frequently associated with thromboembolic complications. Increased platelet activation and platelet-leukocyte aggregate formation can amplify thrombotic responses by inducing tissue factor (TF) expression on leukocytes. Here, we characterized TF-positive extracellular vesicles (EVs) and their cellular origin in 12 patients suffering from severe COVID-19 (time course, 134 samples overall) and 25 healthy controls. EVs exposing phosphatidylserine (PS) were characterized by flow cytometry. Their cellular origin was determined by staining with anti-CD41, anti-CD45, anti-CD235a, and anti-CD105 as platelet, leukocyte, red blood cell, and endothelial markers. We further investigated the association of EVs with TF, platelet factor 4 (PF4), C-reactive protein (CRP), and high mobility group box-1 protein (HMGB-1). COVID-19 patients showed higher levels of PS-exposing EVs compared to controls. The majority of these EVs originated from platelets. A higher amount of EVs in patient samples was associated with CRP, HMGB-1, PF4, and TF as compared to EVs from healthy donors. In COVID-19 samples, 16.5% of all CD41+ EVs displayed the leukocyte marker CD45, and 55.5% of all EV aggregates (CD41+CD45+) co-expressed TF, which reflects the interaction of platelets and leukocytes in COVID-19 on an EV level.
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Affiliation(s)
- Tanja Eichhorn
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, 3500 Krems, Austria; (R.W.); (M.E.-M.); (M.M.); (V.W.)
| | - René Weiss
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, 3500 Krems, Austria; (R.W.); (M.E.-M.); (M.M.); (V.W.)
| | - Silke Huber
- Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, 6020 Innsbruck, Austria; (S.H.); (R.W.)
| | - Marie Ebeyer-Masotta
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, 3500 Krems, Austria; (R.W.); (M.E.-M.); (M.M.); (V.W.)
| | - Marwa Mostageer
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, 3500 Krems, Austria; (R.W.); (M.E.-M.); (M.M.); (V.W.)
| | - Robert Emprechtinger
- Faculty of Health and Medicine, University for Continuing Education Krems, 3500 Krems, Austria;
| | - Ludwig Knabl
- Department of Internal Medicine, Hospital St. Vinzenz, 6511 Zams, Austria;
| | | | - Reinhard Würzner
- Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, 6020 Innsbruck, Austria; (S.H.); (R.W.)
| | - Viktoria Weber
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, 3500 Krems, Austria; (R.W.); (M.E.-M.); (M.M.); (V.W.)
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Shen H, Zaitseva D, Yang Z, Forsythe L, Joergensen S, Zone AI, Shehu J, Maghraoui S, Ghorbani A, Davila A, Issadore D, Abella BS. Brain-derived extracellular vesicles as serologic markers of brain injury following cardiac arrest: A pilot feasibility study. Resuscitation 2023; 191:109937. [PMID: 37591443 PMCID: PMC10528050 DOI: 10.1016/j.resuscitation.2023.109937] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 08/08/2023] [Accepted: 08/09/2023] [Indexed: 08/19/2023]
Abstract
AIM Assessment of neurologic injury within the immediate hours following out-of-hospital cardiac arrest (OHCA) resuscitation remains a major clinical challenge. Extracellular vesicles (EVs), small bodies derived from cytosolic contents during injury, may provide the opportunity for "liquid biopsy" within hours following resuscitation, as they contain proteins and RNA linked to cell type of origin. We evaluated whether micro-RNA (miRNA) from serologic EVs were associated with post-arrest neurologic outcome. METHODS We obtained serial blood samples in an OHCA cohort. Using novel microfluidic techniques to isolate EVs based on EV surface marker GluR2 (present on excitatory neuronal dendrites enriched in hippocampal tissue), we employed reverse transcription quantitative polymerase chain reaction (RT-qPCR) methods to measure a panel of miRNAs and tested association with dichotomized modified Rankin Score (mRS) at discharge. RESULTS EVs were assessed in 27 post-arrest patients between 7/3/2019 and 7/21/2022; 9 patients experienced good outcomes. Several miRNA species including miR-124 were statistically associated with mRS at discharge when measured within 6 hours of resuscitation (AUC = 0.84 for miR-124, p < 0.05). In a Kendall ranked correlation analysis, miRNA associations with outcome were not strongly correlated with standard serologic marker measurements, or amongst themselves, suggesting that miRNA provide distinct information from common protein biomarkers. CONCLUSIONS This study explores the associations between miRNAs from neuron-derived EVs (NDEs) and circulating protein biomarkers within 6 hours with neurologic outcome, suggesting a panel of very early biomarker may be useful during clinical care. Future work will be required to test larger cohorts with a broader panel of miRNA species.
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Affiliation(s)
- Hanfei Shen
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, USA
| | - Daria Zaitseva
- Penn Acute Research Collaboration, Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Zijian Yang
- Department of Radiology, Stanford University, Palo Alto, CA, USA
| | - Liam Forsythe
- Penn Acute Research Collaboration, Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Sarah Joergensen
- Penn Acute Research Collaboration, Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Alea I Zone
- Penn Acute Research Collaboration, Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Joana Shehu
- Penn Acute Research Collaboration, Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Sarah Maghraoui
- Penn Acute Research Collaboration, Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Anahita Ghorbani
- Penn Acute Research Collaboration, Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Antonio Davila
- Penn Acute Research Collaboration, Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA, USA; School of Nursing, University of Pennsylvania, Philadelphia, PA, USA
| | - David Issadore
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, USA
| | - Benjamin S Abella
- Penn Acute Research Collaboration, Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA, USA; Center for Resuscitation Science, Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA, USA.
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