Lipoprotein-apheresis reduces circulating microparticles in individuals with familial hypercholesterolemia
Connolly, Katherine D.
Willis, Gareth R.
Datta, Dev B.N.
Ellins, Elizabeth A.
Price, David A
Guschina, Irina A.
Rees, D. Aled
American Society for Biochemistry and Molecular Biology
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Lipoprotein-apheresis (apheresis) removes LDL-cholesterol in patients with severe dyslipidemia. However, reduction is transient, indicating that the long-term cardiovascular benefits of apheresis may not solely be due to LDL removal. Microparticles (MPs) are submicron vesicles released from the plasma membrane of cells. MPs, particularly platelet-derived MPs, are increasingly being linked to the pathogenesis of many diseases. We aimed to characterize the effect of apheresis on MP size, concentration, cellular origin, and fatty acid concentration in individuals with familial hypercholesterolemia (FH). Plasma and MP samples were collected from 12 individuals with FH undergoing routine apheresis. Tunable resistive pulse sensing (np200) and nanoparticle tracking analysis measured a fall in MP concentration (33 and 15%, respectively; P < 0.05) pre- to post-apheresis. Flow cytometry showed MPs were predominantly annexin V positive and of platelet (CD41) origin both pre- (88.9%) and post-apheresis (88.4%). Fatty acid composition of MPs differed from that of plasma, though apheresis affected a similar profile of fatty acids in both compartments, as measured by GC-flame ionization detection. MP concentration was also shown to positively correlate with thrombin generation potential. In conclusion, we show apheresis nonselectively removes annexin V-positive platelet-derived MPs in individuals with FH. These MPs are potent inducers of coagulation and are elevated in CVD; this reduction in pathological MPs could relate to the long-term benefits of apheresis.
Journal of Lipid Research;
Connolly, K.D., Willis, G.R., Datta, D.B., Ellins, E.A., Ladell, K., Price, D.A., Guschina, I.A., Rees, D.A. and James, P.E. (2014) 'Lipoprotein-apheresis reduces circulating microparticles in individuals with familial hypercholesterolemia', Journal of Lipid Research, 55(10), pp.2064-2072.
This article was published in Journal of Lipid Research on 13 August 2014 (online), available at http://dx.doi.org/10.1194/jlr.M049726 Author's choice paid open access