from PART I - PHYSIOLOGY
Published online by Cambridge University Press: 10 May 2010
Platelet–leukocyte interaction: a tribute to Giulio Bizzozero
The interaction of blood platelets with leukocytes at the site of vascular injury was clearly described by Giulio Bizzozero, more than one century ago:
The blood platelets which are carried by the blood stream are arrested as soon as they reach the lesion of the arterial wall; at first one observes two to six platelets; very rapidly their number grows into hundreds. Usually, among these, a few white blood corpuscles are also arrested.
Every time when a vascular wall is damaged … arrest of white blood corpuscles represents a secondary phenomenon and may, perhaps, be caused by increased adhesive properties of blood platelets whereby these cells react with white blood corpuscles which have been brought into contact with them by blood circulation (Fig. 28.1).
This was probably the first observation of the simultaneous involvement of platelets and leukocytes in hemostasis and thrombus formation.
Since then, the presence of leukocytes in hemostatic platelet plugs and arterial thrombi has been repeatedly observed by microscopy, but the general consensus was that these cells were only playing a passive role in thrombus formation being more likely involved in the subsequent repair process. In the past two decades, a number of studies have been performed looking for interactions between platelets and leukocytes to better understand their possible importance in the physiopathology of thrombosis.
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