Isolation of Microvesicles from Plasma Samples Avoiding Lipoprotein Contamination.

Area of Science:

• Virology
• Immunology
• Biochemistry

Background:

• Dengue virus infection causes severe dengue, characterized by inflammation, thrombocytopenia, and increased vascular permeability.
• Microvesicles (MVs) and lipoproteins are implicated in dengue's inflammatory amplification.
• Existing methods for isolating MVs are often contaminated with lipoproteins, hindering functional studies.

Purpose of the Study:

• To develop a method for simultaneous isolation of MVs and lipoproteins without cross-contamination.
• To enable accurate functional characterization of MVs in dengue pathogenesis.

Main Methods:

• Biphasic density-based gradient ultracentrifugation.
• Flow cytometry for MV quantification.
• Western blot for apolipoprotein B100 (apoB100) detection to assess purity.

Main Results:

• The described ultracentrifugation method successfully isolates MVs and lipoproteins concomitantly.
• The isolation process yields MVs free from lipoprotein contamination.
• Flow cytometry and western blot can confirm MV purity.

Conclusions:

• This novel isolation technique provides a valuable tool for studying the distinct roles of MVs and lipoproteins in dengue pathogenesis.
• Accurate isolation of MVs is essential for understanding their contribution to dengue-associated inflammation and disease severity.