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• W2023704944 abstract "Adenovirus vectors have been used extensively in pre-clinical and clinical studies as agents for gene delivery. Acute, transient thrombocytopenia is a known adverse effect of adenovirus vector administration with a mechanism that currently remains unresolved. The fall in platelets appears 24 hours following IV administration of adenovector and is vector dose dependent. We have initiated experiments to investigate the mechanism of Ad induced thrombocytopenia. We examined the expression of the platelet activation marker P-selectin (CD-62p) on mouse platelets after incubation with adenovirus in vitro by means of flow cytometry. An indirect immunoflourescence approach was used with anti-mouse CD 62p monoclonal antibody and an FITC labeled rat antimouse-IgG. An appropriate negative isotype control and positive platelet activation control using thrombin were incorporated into these studies. The index of platelet activation (IPA), was used to quantify the activation effect of Ad on the platelets. This is the product of the mean channel fluorescence and the percentage of positive cells. We also examined Platelet leucocyte association (PLA) using the direct immunoflourescence and double colour staining of platelets and leucocytes using FITC labeled anti-mouse CD41 (platelets) and PE labeled anti-mouse CD 45 (common leucocyte antigen) respectively. Our study has shown that the mean IPA for platelets stimulated by adenovirus was 2519.4 compared to 128.2 for resting platelets (n=5, p<0.02). Flow cytometric analysis of CD41 (platelets) and CD45 (leucocytes) double stained positive events indicated that Ad stimulation induced PLA when compared to the unstimulated samples. PLA visualisation was also confirmed by means of direct fluorescence microscopy. These preliminary in vitro results indicate that the Adenovirus activates mouse platelets as it induces degranulation and expression of P-selectin and supports the recruitment of leucocytes presumably through an interaction with the leucocyte P-selectin glycoprotein ligand-1. This may have a role in mediating the accelerated platelet clearance by the reticuloendothelial system following adenovirus administration. In addition, the interaction with leucocytes may also stimulate pro-coagulant microparticle generation and thus lead to systemic hemostatic activation. To our knowledge, this is the first report that identifies Adenovirus as an inducer for mouse platelet activation and as a promoter for platelet leucocyte association. However, further in vitro and in vivo studies are still needed to better understand the mechanism of Ad induced thrombocytopenia; a complication that significantly limits the application of Ad mediated gene therapy." @default.
• W2023704944 created "2016-06-24" @default.
• W2023704944 date "2005-05-01" @default.
• W2023704944 modified "2023-10-18" @default.
• W2023704944 title "410. Adenovirus Activates Mouse Platelets and Induces Platelet Leucocyte Association" @default.
• W2023704944 doi "https://doi.org/10.1016/j.ymthe.2005.06.413" @default.
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