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Granulocyte Rheology Before and After Chemotactic Activation in Deep Venous Thrombosis

Several data regard the role of leukocytes in venous disease (1-3). Their role is differentiated, and in fact, although the trapping concerns the monocytes, the activation regards the granulocytes. Recently we examined, in a group of 14 subjects with acute leg deep venous thrombosis (DVT), the granulocyte rheology, expressed as flow properties, the granulocyte membrane fluidity, and the granulocyte cytosolic Ca2+ content, before and after in vitro activation (prolonged for 5 and 15 minutes) with 4-phorbol 12-myristate 13-acetate (4). Venous blood samples were drawn from the arm of subjects within 3 days from the diagnosis. No subject had undergone treatment with molecules that might have interfered with granulocyte rheology and function. Granulocyte flow properties, expressed as initial relative flow rate (IRFR), were examined using the St. George’s Filtro-