The new composition of circulating microvesicles: optimized protocols and reassessment of their characteristics and physiological functions

TL;DR

This paper shows that centrifugation speed affects microvesicle composition, with most being platelet-derived at lower speeds, impacting their clinical and functional interpretations.

Contribution

The study identifies 3000 g as a critical centrifugation speed for isolating platelet-derived microvesicles, clarifying their origin and function.

Findings

Centrifugation at 3000 g yields MVs where over 80% are platelet-derived.

Higher centrifugation speeds result in MVs with only about 20% platelet origin.

Platelet-derived MVs are linked to procoagulation activity and clinical diagnosis.

Abstract

Microvesicles (MVs) have convenient clinical applications and play functional roles in cellular signal transduction. Although the clinical importance of MVs is being increasingly recognized, the current diversity of isolated protocols results in a heterogeneous population of their unknown origins, even expands to uncertain functions. Here, we systematically investigated the composition of MVs at different centrifugal speed intervals and discovered that centrifugation at 3000 g is critical in determining the composition of MVs. We observed that platelet-derived particles accounted for more than 80% of MVs under 3000 g, while only about 20% of MVs were obtained over 3000 g. The discovery that more than 80% of platelet-derived MVs sheds new light on their function, including procoagulation activity and clinical diagnosis, etc. Our work not only optimizes the method for MVs isolation but also clarifies the physiological functions and characteristics that should be attributed to platelets rather than MVs. Consequently, these findings will derive new conceptualizations regarding MVs’ composition and function.

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