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Circulating microparticles: new insights into the biochemical basis of microparticle release and activity
Silvia Montoro-García1, Eduard Shantsila, Francisco Marín
1Haemostasis, Thrombosis and Vascular Biology Unit, City Hospital, University of Birmingham Centre for Cardiovascular Sciences, Birmingham B18 7QH, UK.
Abstract:
Circulating microparticles released from various cell types are present in healthy individuals and the number and composition of their membrane vary in different disorders. Long considered to be cellular debris, microparticles have been recently identified as regulatory vectors of intercellular cross-talk. Indeed, circulating microparticles represent a heterogeneous mixture of spheroids of diverse surface membrane glycoproteins and lipids, with diverse cytoplasm components, the pattern of which depends on the type of stimulation and pathophysiology of parental cells. Despite extensive research into the procoagulant and proinflammatory properties of microparticles, there are few data that can provide information on the mechanism(s) of their formation and biological effects. Although several mechanisms of microparticle release have been suggested, the precise order of the events associated with key features of microparticle formation, transmembrane phosphatidylserine redistribution and cytoskeleton disruption remain to be clarified. In this review, we provide an overview of the molecular mechanisms involved in microparticle formation, as well as the diverse physiological and pathological roles they are able to undertake. Understanding the mechanism(s) governing microparticle release processes may be critical to understanding their precise role in various pathophysiological processes and thus indicate new potential routes to therapy.
Insights
Circulating microparticles, once thought to be debris, are key intercellular communicators. Understanding their formation mechanisms is crucial for revealing their roles in disease and developing new therapies.
Area of Science:
- Cell Biology
- Biochemistry
- Pathophysiology
Background:
- Circulating microparticles (MPs) are released from various cell types and are present in healthy individuals.
- MPs were previously considered cellular debris but are now recognized as regulatory mediators of intercellular communication.
- Their composition varies with stimulation and the pathophysiology of parent cells, highlighting their complexity.
Purpose of the Study:
- To provide an overview of the molecular mechanisms governing microparticle formation.
- To explore the diverse physiological and pathological roles of microparticles.
- To clarify the precise sequence of events in microparticle release, including phosphatidylserine redistribution and cytoskeleton disruption.
Main Methods:
- Literature review focusing on molecular mechanisms of microparticle formation.
- Analysis of existing data on the biological effects and roles of microparticles.
- Synthesis of information regarding transmembrane phosphatidylserine redistribution and cytoskeleton dynamics.
Main Results:
- Microparticles are heterogeneous vesicles with diverse membrane glycoproteins, lipids, and cytoplasmic components.
- While procoagulant and proinflammatory properties are studied, formation mechanisms and biological effects require further elucidation.
- The precise order of events in microparticle release, such as phosphatidylserine exposure and cytoskeleton changes, remains incompletely understood.
Conclusions:
- Understanding microparticle formation is critical for deciphering their roles in various pathophysiological processes.
- Elucidating these mechanisms may reveal novel therapeutic strategies.
- Further research is needed to fully clarify the molecular events driving microparticle release and their functional consequences.
