A flow cytometric method for characterization of circulating cell-derived microparticles in plasma

Journal of Extracellular Vesicles

Morten Hjuler Nielsen¹  Morten Nørgaard Andersen²  Aase Handberg³  Henning Beck-Nielsen⁴ 

[1] Danish PhD School of Molecular Metabolism, Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark;Department of Biomedicine, Aarhus University, Aarhus, Denmark;Department of Clinical Biochemistry, Aalborg University Hospital, Aalborg, Denmark;Department of Endocrinology M, Odense University Hospital, Odense, Denmark;

关键词: extracellular vesicles;    flow cytometry;    coincidence occurrence;    platelet-derived;    monocyte-derived;    endothelial cell-derived;    erythrocyte-derived;    tissue-factor;    lactadherin;   

DOI  :  10.3402/jev.v3.20795

来源: DOAJ

【 摘 要 】

Background and aim: Previous studies on circulating microparticles (MPs) indicate that the majority of MPs are of a size below the detection limit of most standard flow cytometers. The objective of the present study was to establish a method to analyze MP subpopulations above the threshold of detection of a new generation BD FACSAria™ III digital flow cytometer. Methods: We analyzed MP subpopulations in plasma from 24 healthy individuals (9 males and 15 females). MPs were identified according to their size (<1.0-µm), by Lactadherin-FITC labelling, and by exposure of cell-specific markers. The sensitivity of the flow cytometer was tested against that of a previous-generation instrument FC500. Reproducibility of the FACSAria and our set-up was investigated, and the percentage of phosphatidylserine (PS) exposing MPs binding Lactadherin was determined. Results: By using a flow cytometric approach we identified and quantitated MPs derived from platelets, monocytes, erythrocytes and endothelial cells. In addition, levels of tissue factor-positive MPs were determined. The FACSAria demonstrated improved sensitivity and increased MP detection range compared to the FC500 instrument. The reproducibility of PS+PMP and PS+MP measurements was 11.7 and 23.2%, respectively. When expressed as a percentage of total MPs, the PS-positive MP population represented 15.1±5.5%, and PS-positive MPs were significantly increased in men. Conclusion: We have established a method to measure MPs above the detection limit of a new generation flow cytometer and derived from a number of cell-types in a healthy population of men and women.

【 授权许可】

Unknown