INFUSIBLE PLATELET MEMBRANES IMPROVE HEMOSTASIS IN THROMBOCYTOPENIC RABBITS: STUDIES WITH TWO DIFFERENT INJECTION DOSES

Due to the limited life span of platelets during regular storage in blood banks, we were interested to investigate the both potential hemostatic effect and dose-dependent response properties of non-viable platelet preparations with injection of two high and low doses in experimental animal model. Infusible platelet membrane (IPM) was prepared from outdated platelet concentrates. Platelet concentrates were pooled, disrupted by freeze-thaw procedure, pasteurized for 20 hours to inactivate possible viral or bacterial contaminants and finally formulated with sucrose and human serum albumin. Rabbits were made thrombocytopenic. Administration of IPM at two doses of 0.5 and 2.0 mg per kg results significant reduction in the bleeding time. The values of bleeding time in the 80 data sets were obtained. Reduction in the percentage of bleeding time elevation during 2, 4, 6 and 24 hours after injections of 0.5 mg/kg were found 56.8, 66.0, 73.7 ,96.8 and after 2.0 mg/kg injections were observed 24.8, 39.0, 52.4 and 95.6  respectively. We concluded that IPM can significantly reduce bleeding time in thrombocytopenic rabbits with two high and low doses of IPM that confirms potential hemostatic efffect and also shows dose-dependent response property and finally may support its clinical potential utility as a transfusion substitute for platelets.