Microvesicles preparation from mesenchymal stem cells.

Area of Science:

• Cell Biology
• Biotechnology
• Nanotechnology

Background:

• Extracellular vesicles (EVs), including exosomes, microvesicles (MVs), and apoptotic bodies, vary in size and biological function.
• Standardized methods for isolating MVs are lacking, posing a significant challenge in research.
• This study focuses on isolating MVs from umbilical cord-derived mesenchymal stem cells (UC-MSCs).

Purpose of the Study:

• To evaluate different ultracentrifugation schemes for isolating MVs from UC-MSCs.
• To determine the optimal centrifugation speed for maximizing MV yield and purity.
• To characterize the isolated UC-MSC-derived MVs.

Main Methods:

• UC-MSCs were cultured, and MVs were isolated using four different ultracentrifugation speeds (10,000×g to 60,000×g).
• MV fractions were analyzed using Dynamic Light Scattering (DLS) for size, total protein quantification, and flow cytometry for marker expression.
• UC-MSCs were characterized for stem cell markers (CD44, CD73) and hematopoietic markers (CD45, CD34).

Main Results:

• UC-MSCs expressed MSC markers (CD44, CD73) and lacked hematopoietic markers (CD45, CD34).
• Isolated particles ranged from 50 to 1250 nm and expressed UC-MSC surface markers (CD90, CD106, CD166, CD44), while lacking CD34, CD63, and CD9.
• All tested centrifugation speeds yielded MVs <1000 nm; speeds of 40,000×g and 60,000×g additionally produced particles <100 nm.

Conclusions:

• Centrifugation speed significantly impacts the purity and yield of isolated MVs.
• A centrifugation speed of 20,000×g is identified as optimal for purifying UC-MSC-derived MVs.
• This optimized method facilitates reliable MV isolation for further studies.