Filling Gaps in the Vascular Endothelium with Blood Platelets


IN thrombogenesis the interaction between platelets and the wall of the blood vessel is very important. It has been found that after a slight injury to the layer of endothelial cells, platelets adhere to the basement lamina which has been denuded of endothelial cells1. Other platelets adhere to this first layer and form aggregates. Evidence from in vitro investigations has aided the elucidation of the mechanism of platelet–platelet interaction. This mechanism involves ADP, calcium, fibrinogen and possibly some other agents2 in a biological chain reaction3. The mechanism of platelet–vessel wall interaction is not clear. It has been demonstrated in vivo and in vitro that platelets can adhere to collagen fibres4,5. Nevertheless, in experimental thrombosis where the layer of endothelial cells is the only visible site of injury, platelets adhere exclusively to the basement lamina. Collagen fibres are not involved in this process of adhesion1. It is not clear from these experiments, however, whether injury to the endothelial cells and the eventual release of tissue factors were necessary for the interaction of platelet with basement lamina.

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    Baumgartner, H. R., Tranzer, J. P., and Studer, A., Thrombos. Diathes. Haemorrh. (in the press).

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    Born, G. V. R., Vorträge des 4 Freiburger Kolloquiums über Kreislaufmessungen (1963).

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    Born, G. V. R., Ann. Roy. Coll. Surg. Eng., 36, 200 (1965).

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    Hugues, J., CR Soc. Biol., 154, 866 (1960).

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    French, J. E., Macfarlane, R. G., and Sanders, A. G., Brit. J. Exp. Pathol., 45, 467 (1964).

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    Tranzer, J. P., and Thoenen, H., Experientia, 23, 123 (1967).

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TRANZER, J., BAUMGARTNER, H. Filling Gaps in the Vascular Endothelium with Blood Platelets. Nature 216, 1126–1128 (1967).

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