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Mononuclear phagocytes orchestrate prolyl hydroxylase inhibition-mediated renoprotection in chronic tubulointerstitial nephritis.

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Authors
Schley, Gunnar
Klanke, Bernd
Kalucka, Joanna
Schatz, Valentin
Daniel, Christoph
Mayer, Marleen
Goppelt-Struebe, Margarete
Herrmann, Martin
Thorsteinsdottir, Margret
Palsson, Runolfur
Beneke, Angelika
Katschinski, Dörthe M
Burzlaff, Nicolai
Eckardt, Kai-Uwe
Weidemann, Alexander
Jantsch, Jonathan
Willam, Carsten
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Issue Date
2019-08

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Mononuclear phagocytes orchestrate prolyl hydroxylase inhibition-mediated renoprotection in chronic tubulointerstitial nephritis. 2019, 96(2):378-396 Kidney Int
Abstract
Prolyl hydroxylase domain enzyme inhibitors (PHDIs) stabilize hypoxia-inducible factors (HIFs), and are protective in models of acute ischemic and inflammatory kidney disease. Whether PHDIs also confer protection in chronic inflammatory kidney disease models remains unknown. Here we investigated long-term effects of PHDI treatment in adenine-induced nephropathy as a model for chronic tubulointerstitial nephritis. After three weeks, renal dysfunction and tubulointerstitial damage, including proximal and distal tubular injury, tubular dilation and renal crystal deposition were significantly attenuated in PHDI-treated (the isoquinoline derivative ICA and Roxadustat) compared to vehicle-treated mice with adenine-induced nephropathy. Crystal-induced renal fibrosis was only partially diminished by treatment with ICA. Renoprotective effects of ICA treatment could not be attributed to changes in adenine metabolism or urinary excretion of the metabolite 2,8-dihydroxyadenine. ICA treatment reduced inflammatory infiltrates of F4/80+ mononuclear phagocytes in the kidneys and supported a regulatory, anti-inflammatory immune response. Furthermore, interstitial deposition of complement C1q was decreased in ICA-treated mice fed an adenine-enriched diet. Tubular cell-specific HIF-1α and myeloid cell-specific HIF-1α and HIF-2α expression were not required for the renoprotective effects of ICA. In contrast, depletion of mononuclear phagocytes with clodronate largely abolished the nephroprotective effects of PHD inhibition. Thus, our findings indicate novel and potent systemic anti-inflammatory properties of PHDIs that confer preservation of kidney function and structure in chronic tubulointerstitial inflammation and might counteract kidney disease progression.
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https://www.sciencedirect.com/science/article/pii/S0085253819302686?via%3Dihub
ae974a485f413a2113503eed53cd6c53
10.1016/j.kint.2019.02.016
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English Journal Articles (Peer Reviewed)

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