Interleukin-1β inhibits PDGF-BB−induced migration by cooperating with PDGF-BB to induce cyclooxygenase-2 expression in baboon aortic smooth muscle cells

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Interleukin-1β inhibits PDGF-BB−induced migration by cooperating with PDGF-BB to induce cyclooxygenase-2 expression in baboon aortic smooth muscle cells Michael J Englesbe, MD, Jessie Deou, AS, Brenda D Bourns, PhD, Alexander W Clowes, MD, Günter Daum, PhD Journal of Vascular Surgery Volume 39, Issue 5, Pages 1091-1096 (May 2004) DOI: 10.1016/j.jvs.2004.01.041

Fig 1 Interleukin-1β (IL-1β) inhibits platelet-derived growth factor-BB–induced migration in a mechanism dependent on cyclooxygenase-2 and p38 mitogen-activated protein kinase. Where indicated, smooth muscle cells were preincubated for 30 minutes with 10 μmol/L of indomethacin (A), 10 μmol/L of NS398 (B), or 3 μmol/L of SB203589 (C) before addition of IL-1β (0.1 ng/mL) for 2 hours. Cells were harvested and subjected to Boyden chamber assay with PDGF-BB (10 ng/mL) as stimulant (see Methods). Data (mean ± SD) are presented as percent activity, with 100% for unstimulated controls (n = 3 for each group). Statistical significance for the indicated pairwise comparisons was calculated with adjusted Bonferroni correction. All comparisons are significant at P < .05. Journal of Vascular Surgery 2004 39, 1091-1096DOI: (10.1016/j.jvs.2004.01.041)

Fig 2 Platelet-derived growth factor-BB (PDGF-BB) and interleukin-1β (IL-1β) synergize to express cyclooxygenase-2 (COX2); effect of SB203580. A, Quiescent baboon smooth muscle cells were stimulated with 0.1 ng/mL of IL-1β and 10 ng/mL of PDGF-BB in the absence (black bars) or presence (gray bars) of 10 μmol/L of SB203580, as indicated. At 5 hours after stimulation, protein was extracted and analyzed with Western blotting for COX2 (see Methods). Data (mean ± SD) are presented as percent COX2 expression, with 100% the strongest band per experiment. In all four experiments, strongest COX2 expression was obtained in response to IL-1beta plus PDGF-BB in the absence of SB203580. A representative blot is included. *P < .008 (Student t test). Journal of Vascular Surgery 2004 39, 1091-1096DOI: (10.1016/j.jvs.2004.01.041)

Fig 3 Cyclooxygenase-2 (COX2) expression in murine and human smooth muscle cells. Quiescent smooth muscle cells from mouse (black bars) and human being (gray bars) were stimulated with interleukin-1β (IL-1beta; 0.1 ng/mL) and platelet-derived growth factor-BB (PDGF-BB; 10 ng/mL), as indicated. Total cell lysates were prepared 5 hours after stimulation. COX2 expression was analyzed after Western blotting with densitometry of the films. Data (mean ± SD; n = 4 for mouse, n = 2 for human) are presented as percent COX2 expression, with 100% the strongest band per experiment. In all six experiments, strongest COX2 expression was obtained in response to IL-1β plus PDGF-BB. Journal of Vascular Surgery 2004 39, 1091-1096DOI: (10.1016/j.jvs.2004.01.041)

Fig 4 Phosphorylation of p38 mitogen-activated protein kinase (MAPK) in response to interleukin-1β (IL-1β) and platelet-derived growth factor-BB (PDGF-BB). Quiescent baboon smooth muscle cells were stimulated with IL-1β (IL, 0.1 ng/mL) and PDGF-BB (P, 10 ng/mL) for 10, 30, 60, and 120 minutes, as indicated. Total cell lysates were prepared and analyzed with Western blotting for phosphorylated p38 MAPK. A, Representative blot. B, Data (mean ± SEM, n = 3) are presented as percent p38 MAPK phosphorylation, with 100% the strongest band per experiment. For all three experiments, p38 MAPK phosphorylation was strongest in response to IL-1β plus PDGF-BB at 30 minutes after stimulation. Journal of Vascular Surgery 2004 39, 1091-1096DOI: (10.1016/j.jvs.2004.01.041)