Abstract
It is very well established that purinergic signaling plays a relevant role in vascular physiology and pathophysiology. Recently, a new purinoceptor agonist uridine adenosine tetraphosphate (Up4A) has been identified as a highly potent endothelial-derived contracting factor (EDCF). The purpose of the study was to investigate Up4A's influence on pro-inflammatory mechanisms. An early component of the inflammatory response in atherogenesis is the oxidative stress-induced formation of monocyte chemoattractant protein-1 (MCP-1). Here, we investigated the influence of Up4A on MCP-1 formation and characterized the underlying signaling transduction mechanisms in rat vascular smooth muscle cells (VSMCs). Up4A induced MCP-1 expression and secretion in VSMCs via the activation of P2Y2 in a concentration-dependent manner. MCP-1 formation depends on generation of reactive oxygen species (ROS). To determine whether the predominant source of ROS in the vasculature, the NAD(P)H oxidase (Nox), is involved, we used different approaches. The ROS scavenger, tiron, the Nox inhibitor, apocynin and diphenyl-iodonium, as well as Nox1 knockdown, diminished the Up4A-induced MCP-1 formation. Rac1 activation and p47phox translocation from cytosol to the plasma membrane—both required for assembling and activation of Nox, were stimulated by Up4A. ERK1/2 and p38 activation is essential for the intracellular signal transduction. In summary, Up4A induced Nox1-dependent ROS generation, which further stimulated MCP-1 formation via MAPK phosphorylation in VSMCs. This process requires the activation of the G-protein coupled receptor P2Y2. Therefore, Up4A is not only a potent EDCF but also a potent inductor of pro-inflammatory response in the vascular wall.
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Acknowledgments
This work was supported by grants of Deutsche Forschungsgemeinschaft (MvdG, JJ: GI339/7-2); Sonnenfeld-Stiftung (MvdG, MT).
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The authors declare no conflict of interests related to this study.
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Schuchardt, M., Prüfer, J., Prüfer, N. et al. The endothelium-derived contracting factor uridine adenosine tetraphosphate induces P2Y2-mediated pro-inflammatory signaling by monocyte chemoattractant protein-1 formation. J Mol Med 89, 799–810 (2011). https://doi.org/10.1007/s00109-011-0750-6
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DOI: https://doi.org/10.1007/s00109-011-0750-6