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- Vikerfors, A, et al.
(författare)
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Studies of microparticles in patients with the antiphospholipid syndrome (APS)
- 2012
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Ingår i: Lupus. - : SAGE Publications. - 1477-0962 .- 0961-2033. ; 21:7, s. 802-805
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: To study circulating platelet, monocyte and endothelial microparticles (PMPs, MMPs and EMPs) in patients with antiphospholipid syndrome (APS) in comparison with healthy controls. Material and method: Fifty-two patients with APS and 52 healthy controls were investigated. MPs were measured on a flow cytometer (Beckman Gallios) and defined as particles sized < 1.0 µm, negative to phalloidin, positive to lactadherin and positive to either CD42a (PMPs), CD144 (EMPs) or CD14 (MMPs). Exposure of CD142 (TF) was measured on CD144 positive MPs. Results: Total number of MPs (i.e. lactadherin positive particles) was higher in APS patients versus controls ( p < 0.001). An increased number of EMPs ( p < 0.001), increased TF-positive EMPs ( p < 0.001) and increased MMPs ( p < 0.001) were also observed. PMP numbers did not differ between the groups. None of the MP types differed in numbers between obstetric and thrombotic APS patients. Conclusion: We observed a high number of EMPs expressing TF in APS patients. The numbers of MMPs and total EMPs were also higher as compared with healthy controls but in contrast to previous reports, the number of PMPs did not differ between groups.
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- Schulman, S., et al.
(författare)
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The plasma concentration of activated protein C appears normal in patients with haemophilia
- 2009
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Ingår i: Haemophilia. - : Wiley. - 1351-8216 .- 1365-2516. ; 15:2, s. 566-570
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Tidskriftsartikel (refereegranskat)abstract
- Increased concentration of activated protein C (APC) has been observed in patients with thromboembolic disorders, but whether the level of APC in patients with bleeding disorders is decreased remains unknown. Seventy patients with haemophilia A or B with mild, moderate or severe form were studied. Detailed information on bleeding, arthropathy and factor consumption was collected during a 10-year period. The clinical severity of the disease was expressed as the Hemophilia Severity Score (HSS). Plasma concentration of APC was measured as APC in complex with protein C inhibitor. The median concentration of APC-PCI complex in patients with haemophilia was 0.14 mu g L-1 and it did not differ between the types and forms. In 16 patients with severe haemophilia A and the inversion mutation in intron 22, there was no correlation between clinical severity and the concentration of APC-PCI complex. Patients with haemophilia appear to generate normal concentrations of APC during basal conditions. APC does not seem to be an important modulator of the phenotypic expression of haemophilia.
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