George Haddad1, Malte Kölling1, Urs A Wegmann1, Angela Dettling2, Harald Seeger1, Roland Schmitt2, Inga Soerensen-Zender2, Hermann Haller2, Andreas D Kistler3, Anne Dueck4,5, Stefan Engelhardt4,5, Thomas Thum6,7, Thomas F Mueller1, Rudolf P Wüthrich1, Johan M Lorenzen8. 1. Department of Nephrology, University Hospital Zürich, Zurich, Switzerland. 2. Department of Nephrology, Hannover Medical School, Hannover, Germany. 3. Department of Internal Medicine, Cantonal Hospital Frauenfeld, Frauenfeld, Switzerland. 4. Institute of Pharmacology and Toxicology, Technical University of Munich, Munich, Germany. 5. German Center for Cardiovascular Research, partner site Munich Heart Alliance, Munich, Germany. 6. Institute of Molecular and Translational Therapeutic Strategies, Hannover Medical School, Hannover, Germany. 7. Fraunhofer Institute for Toxicology and Experimental Medicine, Hannover, Germany. 8. Department of Nephrology, University Hospital Zürich, Zurich, Switzerland Johan.lorenzen@usz.ch.
Abstract
BACKGROUND: Renal ischemia-reperfusion (I/R) injury is a major cause of AKI. Noncoding RNAs are intricately involved in the pathophysiology of this form of AKI. Transcription of hypoxia-induced, long noncoding RNA H19, which shows high embryonic expression and is silenced in adults, is upregulated in renal I/R injury. METHODS: Lentivirus-mediated overexpression, as well as antisense oligonucleotide-based silencing, modulated H19 in vitro. In vivo analyses used constitutive H19 knockout mice. In addition, renal vein injection of adeno-associated virus 2 (AAV2) carrying H19 caused overexpression in the kidney. Expression of H19 in kidney transplant patients with I/R injury was investigated. RESULTS: H19 is upregulated in kidney biopsies of patients with AKI, in murine ischemic kidney tissue, and in cultured and ex vivo sorted hypoxic endothelial cells (ECs) and tubular epithelial cells (TECs). Transcription factors hypoxia-inducible factor 1-α, LHX8, and SPI1 activate H19 in ECs and TECs. H19 overexpression promotes angiogenesis in vitro and in vivo. In vivo, transient AAV2-mediated H19 overexpression significantly improved kidney function, reduced apoptosis, and reduced inflammation, as well as preserving capillary density and tubular epithelial integrity. Sponging of miR-30a-5p mediated the effects, which, in turn, led to target regulation of Dll4, ATG5, and Snai1. CONCLUSIONS: H19 overexpression confers protection against renal injury by stimulating proangiogenic signaling. H19 overexpression may be a promising future therapeutic option in the treatment of patients with ischemic AKI.
BACKGROUND: Renal ischemia-reperfusion (I/R) injury is a major cause of AKI. Noncoding RNAs are intricately involved in the pathophysiology of this form of AKI. Transcription of hypoxia-induced, long noncoding RNA H19, which shows high embryonic expression and is silenced in adults, is upregulated in renal I/R injury. METHODS: Lentivirus-mediated overexpression, as well as antisense oligonucleotide-based silencing, modulated H19 in vitro. In vivo analyses used constitutive H19 knockout mice. In addition, renal vein injection of adeno-associated virus 2 (AAV2) carrying H19 caused overexpression in the kidney. Expression of H19 in kidney transplant patients with I/R injury was investigated. RESULTS: H19 is upregulated in kidney biopsies of patients with AKI, in murine ischemic kidney tissue, and in cultured and ex vivo sorted hypoxic endothelial cells (ECs) and tubular epithelial cells (TECs). Transcription factors hypoxia-inducible factor 1-α, LHX8, and SPI1 activate H19 in ECs and TECs. H19 overexpression promotes angiogenesis in vitro and in vivo. In vivo, transient AAV2-mediated H19 overexpression significantly improved kidney function, reduced apoptosis, and reduced inflammation, as well as preserving capillary density and tubular epithelial integrity. Sponging of miR-30a-5p mediated the effects, which, in turn, led to target regulation of Dll4, ATG5, and Snai1. CONCLUSIONS: H19 overexpression confers protection against renal injury by stimulating proangiogenic signaling. H19 overexpression may be a promising future therapeutic option in the treatment of patients with ischemic AKI.
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