Activated, not resting, platelets increase leukocyte rolling in murine skin utilizing a distinct set of adhesion molecules

Ralf J. Ludwig*, Jeanette E. Schultz, Wolf Henning Boehncke, Maurizio Podda, Christa Tandi, Fritz Krombach, Holger Baatz, Roland Kaufmann, Ulrich H. Von Andrian, Thomas M. Zollner

*Corresponding author for this work
94 Citations (Scopus)


Selectin-mediated tethering and rolling initiates the multi-step process of leukocyte extravasation which is crucial for the formation of an inflammatory infiltrate. We studied the impact of platelets on this process in the skin. Using intravital microscopy, we analyzed platelet interactions with cutaneous post-capillary venules of mouse ears and observed an increase in platelet rolling if platelets were activated (41.6 ± 20.2% vs. 13.1 ± 8.5% rolling of resting platelets). Experiments with P-selectin deficient mice and antibodies blocking either P-selectin, GPIIb/IIIa or GPIb showed that rolling depends on platelet PSGL-1 and GPIIb/IIIa on one hand, and endothelial P-selectin on the other. Next, formation of platelet-leukocyte aggregates was demonstrated by simultaneous observation of platelets and leukocytes in vivo utilizing a newly developed two-color technique. Aggregates increased overall leukocyte rolling (leukocytes alone: 27.4 ± 11.2%, leukocytes with resting platelets: 25.3 ± 10.2%, leukocytes with activated platelets 38.1 ± 11.8%). To investigate if activated platelets may contribute to the pathogenesis of chronic cutaneous inflammation, platelet P-selectin expression was studied in 8 patients with psoriasis. A correlation between platelet P-selectin expression and disease severity was established. In summary, we show that activated, not resting, platelets increase leukocyte rolling in murine skin. This increased rolling is due to the aggregate formation of platelets with leukocytes. We also provide evidence for a potential role of this mechanism in the pathogenesis of chronic inflammatory skin diseases.

Original languageEnglish
JournalJournal of Investigative Dermatology
Issue number3
Pages (from-to)830-836
Number of pages7
Publication statusPublished - 01.03.2004


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