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Acquired secretion defect in platelets after cryopreservation in dimethyl sulfoxide
Transfusion
|July 1, 1986
Summary
Cryopreserved platelets exhibit impaired function and reduced aggregation due to cryopreservation damage. This study reveals a secretion defect in platelets, impacting granule content and ATP levels after freezing.
Area of Science:
- Biomedical Science
- Hematology
- Cell Biology
Background:
- Platelets are crucial for hemostasis but are susceptible to damage during cryopreservation.
- Cryopreserved platelets often display reduced functionality in various in vitro assays.
Purpose of the Study:
- To investigate the functional deficits of cryopreserved platelets, specifically focusing on aggregation and secretion mechanisms.
- To analyze the impact of cryopreservation on platelet granule content and adenine nucleotide levels.
Main Methods:
- Assessing platelet aggregation in response to collagen.
- Quantifying dense- and alpha-granule content.
- Analyzing adenine nucleotide pools (cytosolic and storage) and adenylate energy charge.
Main Results:
- Cryopreserved platelets showed significantly diminished aggregation when stimulated by collagen.
- A 20-30% loss of dense- and alpha-granule content was observed, indicating a secretion defect.
- Adenine nucleotide analysis revealed a 50% reduction in cytosolic ATP and depleted dense granule ATP and ADP.
Conclusions:
- Platelet cryopreservation induces a significant secretion defect, impairing platelet function.
- The observed defects are likely a consequence of activation processes occurring during freezing and thawing.
- These findings highlight the challenges in preserving platelet function through cryopreservation.