Effect of red cell age on vesiculation in vitro

Area of Science:

• Biomedical science
• Hematology
• Cell biology

Background:

• Microvesiculation, the shedding of membrane-bound vesicles, occurs in red blood cells (RBCs) both in vivo and during in vitro storage.
• Understanding RBC vesiculation is critical for blood banking and transfusion medicine.

Purpose of the Study:

• To investigate and compare the microvesiculation process between young and old red blood cell populations under standard blood bank storage conditions.
• To quantitatively analyze the biochemical composition of vesicles shed by different age groups of RBCs.

Main Methods:

• Red blood cells from whole blood units were separated by density into young and old fractions within a closed system.
• Following 35 days of storage under blood bank conditions, hemoglobin-containing vesicles were quantitatively recovered.
• Protein, cholesterol, and phospholipid content of the recovered vesicles were measured.

Main Results:

• Significantly greater amounts of protein, cholesterol, and phospholipids were found in vesicles shed by younger RBCs compared to older ones.
• No other significant differences were observed in the composition of vesicles shed by the two RBC populations.

Conclusions:

• RBC age influences the biochemical composition of shed microvesicles, with younger cells releasing vesicles richer in protein, cholesterol, and phospholipids.
• These findings contribute to understanding RBC aging and vesicle formation during blood storage.