Abstract
Ischaemia followed by reperfusion (I/R) can induce inflammation and injury and is a risk factor for delayed graft function and rejection of transplanted kidneys. Inflammation is regulated by NF-κB transcription factors which induce pro-inflammatory molecules in endothelial cells (EC). We examined whether A20, a negative regulator of NF-κB, can protect kidneys from I/R injury. To mimic the fluctuations in endothelial oxygenation that occur during I/R we exposed cultured human umbilical vein EC (HUVEC) to hypoxia (1% O2 for 4 h) followed by re-oxygenation (21% O2 for 1 h–24 h). We observed transient expression of pro-inflammatory molecules (E-selectin, VCAM-1 and IL-8) and sustained expression of A20 in HUVEC exposed to hypoxia/re-oxygenation. The effect of A20 on endothelial responses to hypoxia/re-oxygenation was assessed. We observed that pre-treatment of HUVEC with an adenovirus containing A20 (Ad-A20) suppressed activation of NF-κB and induction of pro-inflammatory molecules by hypoxia/re-oxygenation, whereas a control adenovirus had little or no effect. Thus the induction of A20 may form a negative feedback loop in pro-inflammatory signalling in cells exposed to hypoxia/re-oxygenation. To validate our cell culture experiments we examined the role of A20 in renal responses to I/R. We observed that A20 was induced in rat kidneys exposed to I/R. Moreover, pre-treatment of animals with Ad-A20 significantly reduced acute tubular necrosis, renal expression of VCAM-1 and NF-κB activation in response to I/R, whereas pre-treatment with control adenovirus did not. Our observations suggest that A20 maintains physiological homeostasis in kidneys exposed to I/R by protecting them from inflammation and injury.
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Acknowledgments
We thank John McDaid (Imperial College London) and Katja Ahrens, Christoph Schmaderer, Marcel Roos and Krisztina Rusai (Technical University of Munich) for technical support. The work was funded by Kidney Research UK and the KKF program of the Medical Faculty of the Technical University of Munich.
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Jens Lutz and Le A. Luong made equal contributions.
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Lutz, J., Luong, L.A., Strobl, M. et al. The A20 gene protects kidneys from ischaemia/reperfusion injury by suppressing pro-inflammatory activation. J Mol Med 86, 1329–1339 (2008). https://doi.org/10.1007/s00109-008-0405-4
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DOI: https://doi.org/10.1007/s00109-008-0405-4