Review articleFunction and role of microparticles in various clinical settings
Introduction
\Microparticles (MPs) are small membrane vesicles that are released from many different cell types by a process of exocytic budding of the plasma membrane [1], [2], [3]. During their formation, the symmetry of the plasma membrane lipid bilayer is altered, resulting in the exposure of a phospholipid rich surface. Because MPs disseminate various bioactive effectors originating from the parent cells, they can alter vascular function and may induce biological responses involved in vascular homeostasis [4], [5]. Although most MPs in human blood originate from platelets, MPs are also released from leukocytes, erythrocytes and endothelial cells, albeit at much lower numbers [6], [7], [8], [9], [10]. Cell membrane MPs have been detected at small amounts in the blood of normal individuals. Elevated platelet-derived MP (PDMP), endothelial cell-derived MP (EDMP), and monocyte-derived MP (MDMP) concentrations are documented in almost all thrombotic diseases occurring in both venous and arterial beds [11], [12], [13], [14], [15], [16]. In addition, elevated levels of MPs have been found in a number of conditions associated with inflammation, cellular activation and dysfunction, angiogenesis and transport [17], [18], [19], [20], [21], [22], [23]. However, whether MPs directly contribute to disease, or are merely a reflection of disease, remains to be determined. In this review, we will address the function of MPs, and present evidence for a dynamic role of MPs in various clinical settings.
Section snippets
Composition of MPs
MPs can range in size from 0.02 μm to 0.1 μm, and they have no clear definition. It is unclear whether MPs arise from complete conversion of a few cells or from partial conversion of many or most cells, but it is likely that either process occurs. MP membrane composition reflects the membranous elements of the cell of origin (Table 1). George et al. [24] quantified many different glycoprotein (GP)s on PDMPs and many were present routinely, notably αIIbβ3 and GPIb/IX/V. Sims et al. [25]
Diseases and MPs
Decreased numbers of MPs may be associated with a tendency for bleeding. For example, Scott Syndrome and Castman Syndrome have been attributed to a bleeding tendency by qualitative or quantitative abnormalities in PDMP [88], [89], [90]. However, most problems concerning MPs in the clinical setting are related to a thrombotic tendency. That is to say, increased numbers of circulating MPs have been reported in a wide range of diseases associated with an increased risk of thrombosis. Numerous
Conclusion
We have summarized the literature to date relevant to MPs, including the growing list of clinical disorders associated with elevated MP levels. MPs were initially thought to be small particles with procoagulant activity. However, the possibility that MPs evoke cellular responses in the immediate microenvironments where they are formed is now under investigation.
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