Journal of Molecular Medicine

, Volume 86, Issue 12, pp 1329–1339

The A20 gene protects kidneys from ischaemia/reperfusion injury by suppressing pro-inflammatory activation

  • Jens Lutz
  • Le A. Luong
  • Matthias Strobl
  • Meihong Deng
  • Hai Huang
  • Martina Anton
  • Mustafa Zakkar
  • Karine Enesa
  • Hera Chaudhury
  • Dorian O. Haskard
  • Marcus Baumann
  • Joseph Boyle
  • Sarah Harten
  • Patrick H. Maxwell
  • Charles Pusey
  • Uwe Heemann
  • Paul C. Evans
Original Article

DOI: 10.1007/s00109-008-0405-4

Cite this article as:
Lutz, J., Luong, L.A., Strobl, M. et al. J Mol Med (2008) 86: 1329. doi:10.1007/s00109-008-0405-4

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.

Keywords

Endothelial cells Renal Hypoxia/re-oxygenation Ischaemia/reperfusion A20 NF-κB Ischaemia Kidney Gene transfer 

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Jens Lutz
    • 1
  • Le A. Luong
    • 2
  • Matthias Strobl
    • 1
  • Meihong Deng
    • 1
  • Hai Huang
    • 1
  • Martina Anton
    • 3
  • Mustafa Zakkar
    • 2
  • Karine Enesa
    • 2
  • Hera Chaudhury
    • 2
  • Dorian O. Haskard
    • 2
  • Marcus Baumann
    • 1
  • Joseph Boyle
    • 2
  • Sarah Harten
    • 4
  • Patrick H. Maxwell
    • 4
  • Charles Pusey
    • 4
  • Uwe Heemann
    • 1
  • Paul C. Evans
    • 2
  1. 1.Department of NephrologyTechnische Universität München, Klinikum rechts der IsarMunichGermany
  2. 2.BHF Cardiovascular Sciences UnitNational Heart and Lung Institute, Imperial College LondonLondonUK
  3. 3.Department of Experimental Oncology and Therapy ResearchTechnische Universität München, Klinikum rechts der IsarMunichGermany
  4. 4.Renal SectionImperial College LondonLondonUK

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