Clearance and In Vivo Release by Heparin of Human Platelet Factor 4 (PF₄) in the Rabbit

Summary

13 male New Zealand rabbits were injected with two different doses (25 μg/Kg and 100 μg/Kg) of human platelet factor 4 antigen (PF₄). The disappearance of the protein was extremely fast with an half-life for the fast component of 1.07 ± 0.16 and 1.76 ± 0.11 min respectively. The half-life for the slow component, detectable only with the highest dosage, was 18.8 min.

The administration of 2500 I.U. of heparin 30 min after PF₄ administration induced a partial release of the injected protein and its clearance from plasma was slow, with half-life of 23.3 ± 5.9 min and 30.9 ± 2.19 min respectively.

Keywords

Human platelet factor 4 - Heparin - Rabbit

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