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1 April 2002 Platelet Adhesion to Photodynamic Therapy–treated Extracellular Matrix Proteins
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Abstract

Photodynamic therapy (PDT) produces reactive species that alter vascular wall biology and vessel wall proteins. In this study, we examined platelet adhesion to PDT-treated (photosensitizer = Photofrin; fluence 100 J/cm2; λ = 630 nm) extracellular matrix (ECM), fibrinogen, von Willebrand factor (vWF) and collagen Types I and III, under flow conditions in a recirculating perfusion chamber. Platelet adhesion was quantified by image analysis. The effect of PDT on vWF was assessed by measuring the binding of domain-specific antibodies to treated vWF. PDT significantly decreased platelet adhesion to the ECM, fibrinogen and vWF. However, PDT of collagen resulted in significantly increased platelet adhesion, with large aggregate formation. PDT affected mostly the A1 (glycoprotein [GP]-Ib–binding site), A2 and A3 (collagen-binding site) domains of vWF but not the D'-D3 (factor VIII–binding site) and B-C1 (GP-IIb/IIIa–binding site) domains. In conclusion, PDT can alter the ECM, resulting in decreased platelet adhesion. However, vessels with high collagen content, such as veins and small arteries, may become increasingly prone to thrombosis. The results of this study may thus play a role in understanding the thrombogenic properties and mechanisms of vascular PDT.

Patrick Fungaloi, Randolph Statius van Eps, Ya-Ping Wu, Jan Blankensteijn, Phillip de Groot, Hero van Urk, Richard van Hillegersberg, and Glenn LaMuraglia "Platelet Adhesion to Photodynamic Therapy–treated Extracellular Matrix Proteins," Photochemistry and Photobiology 75(4), 412-417, (1 April 2002). https://doi.org/10.1562/0031-8655(2002)075<0412:PATPTT>2.0.CO;2
Received: 26 October 2001; Accepted: 1 January 2002; Published: 1 April 2002
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