Plasma levels of P-selectin are determined by platelet turn-over and the P-selectin Thr715Pro polymorphism.
BACKGROUND
Plasma levels of soluble P-selectin (sP-selectin) are often used to demonstrate platelet activation.


METHODS
We determined sP-selectin in a variety of disorders characterized by high or low platelet counts and compared their levels with those in healthy subjects. Furthermore, we determined the Thr715Pro polymorphism in all subjects.


RESULTS
Total concentrations of sP-selectin were clearly associated with levels of platelet counts. Thus, calculation of sP-selectin per platelet showed that these levels in patients with thrombocytopenia due to marrow failure and in patients with increased platelet counts were similar to those in controls. Only patients with an increased platelet turn-over had elevated sP-selectin per platelet. While carriers of the Pro715 polymorphism had lower sP-selectin levels than non-carriers, this genetic disposition was over-ruled in patients with increased platelet turn-over.


CONCLUSIONS
For the demonstration of platelet activation it is preferable to define sP-selectin based on platelet counts under the consideration of the Pro715Thr polymorphism.
Panzer
Simon
S
Clinic for Blood Group Serology, Department of Internal Medicine I, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria. simon.panzer@meduniwien.ac.at
Rosales
Sergio
S
Gisslinger
Heinz
H
Jungbauer
Lea
L
Kaider
Alexandra
A
Knöbl
Paul
P
Sillaber
Christian
C
Pabinger
Ingrid
I
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001792:Blood Platelets / Q000737:chemistry* / Q000378:metabolism; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019007:P-Selectin / Q000097:blood* / Q000235:genetics*; D010976:Platelet Count; D011110:Polymorphism, Genetic
D019007:P-Selectin