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Summary
Platelet serotonin (5HT) levels remain stable during 5-day storage of platelet concentrates. This indicates that 5HT is sequestered within platelets and not metabolized, preserving its integrity for transfusion.
Area of Science:
- Biochemistry
- Hematology
- Analytical Chemistry
Background:
- Platelets store significant amounts of serotonin (5-hydroxytryptamine, 5HT).
- Understanding 5HT stability in platelet concentrates (PCs) is crucial for transfusion medicine.
Purpose of the Study:
- To quantify 5HT levels in platelets.
- To investigate the stability and fate of platelet 5HT during PC storage.
Main Methods:
- High-pressure liquid chromatography (HPLC) with native fluorescence detection was employed.
- 5HT was extracted from platelets lysed with Triton X-100.
- Platelet concentrates were stored at 22°C with agitation for 5 days.
Main Results:
- HPLC method achieved femtomol detection limits for 5HT.
- Mean 5HT content was comparable in random-donor PCs and cytapheresis-prepared platelets.
- Platelet 5HT remained sequestered within platelets after 5 days of storage.
- No significant increase in major 5HT metabolites was detected in plasma.
Conclusions:
- Platelet-derived 5HT is stable and sequestered in dense granules during 5-day storage of PCs at 22°C.
- The integrity of platelet 5HT is maintained, suggesting no significant degradation or metabolism occurs under these storage conditions.