Characterization of Microvesicles Released from Human Red Blood Cells

Area of Science:

• Cell Biology
• Hematology
• Biophysics

Background:

• Extracellular vesicles (EVs), including microvesicles (MVs), are released from cells under various conditions.
• Human red blood cells (RBCs) release MVs, but the formation process and physical properties are not well understood.
• This study focuses on MVs released from RBCs upon stimulation of Ca2+ uptake and protein kinase C activation.

Purpose of the Study:

• To investigate the formation process of MVs released from human RBCs.
• To isolate and characterize these MVs.
• To analyze the physical properties of RBC-derived MVs under specific stimulation conditions.

Main Methods:

• Single-cell fluorescence imaging, flow cytometry (FACS), SEM, AFM, and DLS were employed.
• MVs were collected using differential centrifugation.
• Characterization included size, morphology, and zeta potential measurements.

Main Results:

• Stimulation with Ca2+ or protein kinase C activators induced RBC morphological changes and MV release.
• Annexin V-FITC confirmed phosphatidylserine exposure and MV formation.
• SEM, AFM, and DLS characterized MVs with sizes of approximately 206 nm and 126 nm; zeta potential ranged from -40 mV to -10 mV.

Conclusions:

• Increased intracellular Ca2+ or activated protein kinase C induces MV formation and release in human RBCs.
• The study provides detailed characterization of RBC-derived MVs.
• Findings contribute to understanding EV biogenesis and RBC physiology.