RT Journal Article
SR Electronic
T1 P-selectin glycoprotein ligand-1 VNTR polymorphisms and risk of thrombosis in the antiphospholipid syndrome
JF Annals of the Rheumatic Diseases
JO Ann Rheum Dis
FD BMJ Publishing Group Ltd and European League Against Rheumatism
SP 1378
OP 1380
DO 10.1136/ard.2007.075945
VO 66
IS 10
A1 Diz-Kucukkaya, Reyhan
A1 Inanc, Murat
A1 Afshar-Kharghan, Vahid
A1 Zhang, Q Ed
A1 López, José A
A1 Pekcelen, Yuksel
YR 2007
UL http://ard.bmj.com/content/66/10/1378.abstract
AB Objectives: Antiphospholipid antibodies (aPLA) have been shown to enhance thrombus formation by increasing the expression of adhesive receptors such as P-selectin on endothelial cells. The P-selectin counter-receptor on leucocytes is P-selectin glycoprotein ligand-1 (PSGL-1). We have previously described a variable number of tandem repeats (VNTR) polymorphism in the mucin-like region of PSGL-1, with three alleles: allele A, 16 repeats; allele B, 15 repeats; and allele C, 14 repeats.Methods: We compared the PSGL-1 VNTR allele and genotype frequencies in 90 patients with antiphospholipid syndrome (APS) with thrombosis, 39 patients with persistent aPLA positivity without thrombosis, and 203 healthy controls.Results: The frequency of the B allele was significantly higher in patients with APS with thrombosis compared with patients without thrombosis (p = 0.023). When we compared the groups by genotype frequencies, we found a markedly higher frequency of the AB genotype in patients with APS with thrombosis than in aPLA-positive patients without thrombosis (38.9% vs 10.3%, p = 0.001) or in normal population (38.9% vs 22.2%, p<0.01).Conclusions: We suggest that the VNTR polymorphism of PSGL-1 is a significant determinant of thrombotic predisposition in patients with APS. Furthermore, risk appears to correlate best with the combination of alleles inherited rather than with the presence of any particular allele.