Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Zbikowska, H.M. et al.

Halina Malgorzata Zbikowska, Pawel Nowak, Barbara Wachowicz,

Haemostatic properties of human plasma subjected to a sterilizing dose of gamma irradiation in the presence of ascorbate.

The objective was to study the effects of gamma irradiation, in the presence of sodium ascorbate, on coagulation/fibrinolytic activity of fresh frozen plasma to be applied to inactivate the transfusion-transmitted viruses in plasma-derived products. Plasma was irradiated (50 kGy total dose, on dry ice) using a 60Co source. The plasma proteins were analysed by sodium dodecyl sulphate-polyacrylamide gel electrophoresis and western blot and the following parameters estimated: prothrombin time, functional fibrinogen concentration, thrombin-induced fibrinogen polymerization, plasminogen activity, and tissue-type plasminogen activator-induced conversion of plasminogen to plasmin. In irradiated plasma a moderate fragmentation of the most labile plasma proteins was found. The prothrombin time was prolonged (1.5-fold), functional fibrinogen was significantly reduced (60%), fibrinogen polymerization was impaired, plasminogen was predominantly maintained (90%) and tissue-type plasminogen activator-induced conversion of plasminogen to plasmin was unchanged. Ascorbate (25 mmol/l) raised the level of functional fibrinogen in irradiated plasma (to 50%; P=0.0245) and slightly accelerated its polymerization. The small protective effect of ascorbate might be due to inhibition of the radiation-induced fibrinogen oxidation and/or fragmentation but addition of other antioxidants/stabilizers would be crucial when a high irradiation dose, an effective treatment for inactivation of the most resistant viruses, is applied.[1]

References

Haemostatic properties of human plasma subjected to a sterilizing dose of gamma irradiation in the presence of ascorbate. Zbikowska, H.M., Nowak, P., Wachowicz, B. Blood Coagul. Fibrinolysis (2007) [Pubmed]

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