Abstract
Neutrophils isolated from human peripheral blood added to a monolayer of human endothelial cells (ECV-304 cell line) stimulated with LPS (100 ng ml−1) resulted in: (a) neutrophil activation, measured by spreading and release of leukotriene B4 (LTB4); (b) neutrophil degranulation, measured by release of matrix pro-metalloproteinase-9 (proMMP-9) and (c) loss of the monolayer integrity due to detachment of the endothelial cells. Stimulation of endothelial cells with tumor necrosis factor-α (TNF-α 10 ng ml−1) or interleukin-1 (IL-1; 10 ng ml−1) induced a similar dose-dependent increase in the neutrophil activation and endothelial cell detachment. Pre-treatment of LPS-activated ECV-304 cells with [Phe22]BigET-1(19–37) (10−9 M; an inhibitor of endothelin converting enzyme (ECE)) or addition of BQ-123 (10−6 M; a selective endothelin A (ETA) receptor antagonist) to the co-cultures, significantly reduced neutrophil spreading (50–70% inhibition) as well as the levels of LTB4 (70–100% inhibition) and proMMP-9 (40–50% inhibition) in the co-culture supernatants. In addition, the detachment of endothelial cells was also reduced (60–75% inhibition). Moreover, the exogenous addition of ET-1 (10−9 M) to neutrophil suspensions induced neutrophil spreading and release of LTB4 and proMMP-9. Taken together, these findings indicate that neutrophils added to stimulated endothelial cells in the co-culture system employed in this study, get activated by products of these cells and degranulate. In parallel, the detachment of endothelial cell monolayer from the culture plates, possibly by the action of neutrophil granule-derived gelatinases, is observed. Endothelins (ETs) produced by the endothelial cells are suggested to play an essential role in these phenomena.
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Acknowledgements
The authors would like to thank Dr. Helena Nader (UNIFESP, São Paulo, Brazil) for the generous gift of the ECV-304 cell line. The study was supported by a grant from the Fundação de Amparo a Pesquisa do Estado de São Paulo, the Conselho Nacional de Pesquisa e Tecnologia (CNPq) and the Canadian Institutes of Health Research.
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Toffoli, M.C., Gabra, B.H., Teixeira, C.F.P. et al. Endothelins Mediate Neutrophil Activation, ProMMP-9 Release and Endothelial Cell Detachment. Inflammation 30, 28–37 (2007). https://doi.org/10.1007/s10753-006-9018-7
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DOI: https://doi.org/10.1007/s10753-006-9018-7