Ultrastructural alterations and phagocytic function of cryopreserved platelets.

Area of Science:

• Hematology
• Cell Biology
• Biotechnology

Background:

• Platelets are crucial for hemostasis and thrombosis.
• Cryopreservation is a common method for storing biological materials, including platelets.
• Understanding the impact of cryopreservation on platelet morphology and function is vital for transfusion medicine.

Purpose of the Study:

• To investigate the ultrastructural changes in human platelets after cryopreservation using dimethylsulfoxide.
• To assess the functional capacity of cryopreserved platelets in terms of particle uptake.
• To correlate morphologic alterations with potential reductions in platelet functional activity.

Main Methods:

• Human platelets were cryopreserved in 4% dimethylsulfoxide.
• Platelets were examined ultrastructurally before and after incubation with latex particles.
• Morphological changes and latex particle phagocytosis were evaluated using electron microscopy.

Main Results:

• Cryopreserved platelets showed fewer discoid forms and more sphered platelets compared to fresh platelets.
• Sphered platelets exhibited increased vacuolation and organelle pallor.
• Phagocytosis of latex particles into vacuoles was significantly impaired in cryopreserved platelets.

Conclusions:

• Cryopreservation, including freezing, thawing, and washing, induces significant ultrastructural alterations in human platelets.
• These morphologic changes are associated with a marked impairment in phagocytic activity.
• The observed alterations suggest a reduction in the overall functional capacity of cryopreserved platelets.