Effects of inflammatory cytokines on the release and cleavage of the endothelial cell–derived ultralarge von Willebrand factor multimers under flow by.

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Presentation transcript:

Effects of inflammatory cytokines on the release and cleavage of the endothelial cell–derived ultralarge von Willebrand factor multimers under flow by Aubrey Bernardo, Chalmette Ball, Leticia Nolasco, Joel F. Moake, and Jing-fei Dong Blood Volume 104(1):100-106 July 1, 2004 ©2004 by American Society of Hematology

IL-8 and TNF-α, but not IL-6, stimulated the release of ULVWF multimers. IL-8 and TNF-α, but not IL-6, stimulated the release of ULVWF multimers. HUVECs were stimulated with TNF-α (50 ng/mL), IL-6 (100 ng/mL), or IL-8 (100 ng/mL) for 30 minutes and then perfused with washed platelets suspended in Tyrode buffer at 2.5 dyne/cm2. The formation of the platelet-decorated ULVWF strings was detected on endothelial cells stimulated with TNF-α (A) or IL-8 (B), but not on those stimulated with IL-6 (C). Histamine-stimulated endothelial cells (D) were used as positive control. No strings formed on untreated endothelial cells (E). The figure is a representative of 6 separate experiments (bar = 100 μm). Aubrey Bernardo et al. Blood 2004;104:100-106 ©2004 by American Society of Hematology

IL-8 and TNF-α induced the release of ULVWF from HUVECs IL-8 and TNF-α induced the release of ULVWF from HUVECs. (A) HUVECs were treated with various concentrations of cytokines for 30 minutes and then perfused with washed platelets suspended in Tyrode buffer at 2.5 dyne/cm2. IL-8 and TNF-α induced the release of ULVWF from HUVECs. (A) HUVECs were treated with various concentrations of cytokines for 30 minutes and then perfused with washed platelets suspended in Tyrode buffer at 2.5 dyne/cm2. The ULVWF released from HUVECs stimulated by IL-8 or TNF-α had maximal effects at 100 and 10 ng/mL, respectively (mean ± SEM, Student t test, n = 9). (B) HUVECs were treated with 50 ng/mL TNF-α for up to 24 hours before perfusion with washed platelets. The formation of ULVWF strings increased with incubation times, reaching a plateau after 60 minutes (mean ± SEM, n = 4). Aubrey Bernardo et al. Blood 2004;104:100-106 ©2004 by American Society of Hematology

IL-6 bound sIL-6R and stimulated ULVWF release from HUVECs IL-6 bound sIL-6R and stimulated ULVWF release from HUVECs. Recombinant human IL-6 (100 ng/mL) was incubated with sIL-6R (80 ng/mL), and IL-6 binding to sIL-6R detected using a monoclonal IL-6 antibody. IL-6 bound sIL-6R and stimulated ULVWF release from HUVECs. Recombinant human IL-6 (100 ng/mL) was incubated with sIL-6R (80 ng/mL), and IL-6 binding to sIL-6R detected using a monoclonal IL-6 antibody. (A). sIL-6R bound to immobilized IL-6, but not BSA (mean ± SEM, Student t test, n = 3, *P < .001, as compared to plates coated with BSA). (B). HUVECs were treated with preformed IL-6–sIL-6R complexes for 30 minutes and perfused with washed platelets at 2.5 dyne/cm2 shear stress. The platelet-decorated ULVWF strings formed on the complex-stimulated HUVECs, but the number of strings was significantly less than those of cells stimulated with histamine, IL-8, and TNF-α (mean ± SEM, Student t test, n = 3, **P < .01, compared to stimulation with histamine). Aubrey Bernardo et al. Blood 2004;104:100-106 ©2004 by American Society of Hematology

IL-6, but not IL-8 and TNF-α, inhibited cleavage of ULVWF strings by ADAMTS13 under flow. IL-6, but not IL-8 and TNF-α, inhibited cleavage of ULVWF strings by ADAMTS13 under flow. Normal PRP samples were pretreated with each of the 3 cytokines and perfused over histamine-stimulated HUVECs at 2.5 dyne/cm2 shear stress. The platelet-decorated ULVWF strings were mostly cleaved in the presence of PRP treated with IL-8 or TNF-α, but not in the presence of IL-6–pretreated PRP. The maximal inhibitory effect on ULVWF cleavage was observed at 100 ng/mL IL-6. As controls, there was no string formed with untreated PRP (100% cleavage), whereas the perfusion of washed platelets suspended in Tyrode buffer resulted in a significant number of strings (no cleavage). Figures were mean ± SEM, Student t test, n = 6, *P < .01 compared to IL-8– and TNF-α–treated PRP. Aubrey Bernardo et al. Blood 2004;104:100-106 ©2004 by American Society of Hematology

IL-6 inhibited the cleavage of ULVWF strings under different conditions. IL-6 inhibited the cleavage of ULVWF strings under different conditions. (A) PRP treated with preformed IL-6–sIL-6R complexes inhibited the cleavage of ULVWF strings similarly to that of IL-6 alone. IL-6 also inhibited cleavage of ULVWF strings in whole blood. (B) Pretreatment of partially purified ADAMTS13 with IL-6 inhibited the cleavage of ULVWF strings under flow by approximately 50%. Figures are mean ± SEM, Student t test, n = 6, *P < .01 compared to untreated PRP or purified ADAMTS13. Aubrey Bernardo et al. Blood 2004;104:100-106 ©2004 by American Society of Hematology

Time course of IL-6 inhibition on the cleavage of ULVWF strings. Time course of IL-6 inhibition on the cleavage of ULVWF strings. The rates of cleavage of ULVWF strings by normal plasma, plasma pretreated with 100 ng/mL IL-6, or plasma from patients with congenital TTP were measured by quantitating the numbers of ULVWF-platelet strings formed on HUVECs over a period of 15 minutes. Normal plasma completely cleaved and released ULVWF strings from endothelial cells within 2 minutes after the initiation of perfusion. Cleavage by plasma treated with IL-6 was significantly delayed with maximal cleavage achieved 15 minutes after perfusion initiation. TTP plasma failed to cleave ULVWF strings within 15 minutes of perfusion. Figures are mean ± SEM, n = 4. Aubrey Bernardo et al. Blood 2004;104:100-106 ©2004 by American Society of Hematology

IL-6, IL-8, and TNF-α did not inhibit cleavage of ULVWF multimers under static conditions. IL-6, IL-8, and TNF-α did not inhibit cleavage of ULVWF multimers under static conditions. ULVWF multimers were incubated with normal plasma or plasma pretreated for 30 minutes at room temperature with IL-6, IL-8, or TNF-α in the presence of urea and barium. After a 24-hour incubation, plasma treated with each cytokine cleaved ULVWF substrate to the same extent as untreated plasma. The figure is a representative of 3 independent experiments. Aubrey Bernardo et al. Blood 2004;104:100-106 ©2004 by American Society of Hematology