Storage of buffy-coat-derived platelets in additive solutions at 4 degrees C and 22 degrees C: flow cytometry analysis of platelet glycoprotein expression.
BACKGROUND
The aim of our in vitro study is to compare the effects on platelet membrane glycoproteins that play an important role in the main functions of platelets, when platelets are stored for a period of 21 days at 4 degrees C or 22 degrees C.


METHODS
Platelet concentrates (PC) were prepared from pooled buffy-coats (BC) for paired studies (total eight pools from 80 BCs) by using the OrbiSac system. We divided each pool into two PCs and stored them at 4 degrees C or 22 degrees C.


RESULTS
The activation marker CD62 remained almost unchanged during storage in all units. The expression of CD63 was higher in PCs stored at 22 degrees C than in those stored at 4 degrees C. No significant difference in CD41 expression was detected over time. The expression of CD42b declined during storage and even more in PCs stored at 4 degrees C until day 21 [day 14: mean flourscence intensity: 32.5 +/- 13.1 vs. 46.5 +/- 19.1], but the percentage of platelets expressing CD42b remained high in platelets stored at 4 degrees C, but gradually decreased at 22 degrees C (day 14: 95.0 +/- 1.5 vs. 59.0 +/- 9.9). Storage at 4 degrees C reduced the rate of glycolysis and maintained the pH better after day 10 than in PCs stored at 22 degrees C (day 14: 7.009 +/- 0.067 vs. 7.233 +/- 0.125). The concentration of regulated upon activation of normal T-cells expressed and secreted was higher in PCs stored at 22 degrees C than at 4 degrees C (day 7: 414.7 +/- 32.3 vs. 49.6 +/- 19.0). No response to extent of shape change and no swirling were detected at 4 degrees C.


CONCLUSIONS
Platelets stored at 4 degrees C retain their in vitro characteristics better than those stored at 22 degrees C, except for parameters that reflect changes in shape. Storage at 4 degrees C is not associated with an increased expression of glycoprotein (GpIb, GpIIb/IIIa) and platelet activation markers (CD62p and CD63) as compared with storage at 22 degrees C.
Sandgren
P
P
Agneta Shanwell Department of Laboratory Medicine, Karolinska Institutet [corrected] Stockholm, Sweden. per.sandgren@karolinska.se
Hansson
M
M
Gulliksson
H
H
Shanwell
A
A
D001792:Blood Platelets / Q000166:cytology / Q000378:metabolism*; D001793:Blood Preservation; D048430:Cell Shape; D003080:Cold Temperature; D005434:Flow Cytometry; D005786:Gene Expression Regulation / Q000187:drug effects; D006358:Hot Temperature; D006801:Humans; D006863:Hydrogen-Ion Concentration; D019188:Organ Preservation Solutions / Q000494:pharmacology*; D015539:Platelet Activation / Q000187:drug effects; D010980:Platelet Membrane Glycoproteins / Q000096:biosynthesis*; D013997:Time Factors
D019188:Organ Preservation Solutions; D010980:Platelet Membrane Glycoproteins