Haemonetics Blood Services and Training Institute, Tucson, AZ
The expression of p-selectin during collection, processing, and storage of platelet concentrates: relationship to loss of in vivo viability
Article first published online: 27 FEB 2003
Volume 37, Issue 1, pages 12–17, January 1997
How to Cite
Holme, S., Sweeney, J.D., Sawyer, S. and Elfath, M.D. (1997), The expression of p-selectin during collection, processing, and storage of platelet concentrates: relationship to loss of in vivo viability. Transfusion, 37: 12–17. doi: 10.1046/j.1537-2995.1997.37197176945.x
- Issue published online: 27 FEB 2003
- Article first published online: 27 FEB 2003
- Received for publication January 23, 1996; revision received June 3, 1996, and accepted June 18, 1996.
BACKGROUND: Recent studies suggested that platelet activation with surface expression of p-selectin on stored platelets may be related to a loss of viability. At present, there has been no thorough investigation of the extent or significance of p-selectin expression during the collection, processing, and storage of platelet concentrates (PCs) under various conditions.
STUDY DESIGN AND METHODS: Platelet surface expression of p-selectin (CD62) was determined on fixed platelet samples using fluorescein-conjugated monoclonal antibodies. Platelet viability was assessed by autologous transfusion of platelets stored for 5 days and labeled with either 51Cr or 111in.
RESULTS: Little (2–10%) platelet expression of p-selectin was found in whole blood and platelet-rich-plasma preparations, whereas PCs showed a substantial increase in p-selectin expression to levels of 20 to 30 percent. Both fresh PCs and those stored for 5 days, obtained with one cell separator (MCS, Haemonetics) showed substantially lower levels of p-selectin expression than PCs from two other cell separators (Spectra, COBE, and CS-3000 with TNX-6, Baxter Healthcare). Exposure of platelets to EDTA, cold, or a pH below 6.2, conditions that are known to result in the loss of viability upon transfusion, produced substantial and irreversible p-selectin expression. PCs with a pH of 6.2 to 6.8 (conditions in which no loss of viability has been demonstrated) also showed pronounced p-selectin expression, which returned to control values after incubation at 37° C in plasma at pH 7.0 to 7.2. With storage under current conditions the in vivo studies (n = 61) demonstrated a rather poor correlation between p-selectin expression and the percentage of recovery (r = −0.25) but a somewhat better correlation with survival (r = −0.42). Better correlations were observed with the extent of shape change, lactate, and hypotonic shock response.
CONCLUSION: These studies show that p-selectin expression on the platelet surface is a predictor of platelet viability, although the extent of shape change and the hypotonic shock response may be more sensitive.