Dexamethasone Ameliorates Renal Ischemia-reperfusion Injury

Overview

Journal J Am Soc Nephrol

Specialty Nephrology

Date 2009 Oct 3

PMID 19797168

Citations 53

Authors

Sanjeev Kumar

David A Allen

Julius E Kieswich

Nimesh S A Patel

Steven Harwood

Emanuela Mazzon

Salvatore Cuzzocrea

Martin J Raftery

Christoph Thiemermann

Muhammad M Yaqoob

Affiliations

Soon will be listed here.

Abstract

In the setting of renal ischemia-reperfusion injury (IRI), the effect and mechanism of action of glucocorticoids are not well understood. In rat renal IRI, a single dose of dexamethasone administered before ischemia, or at the onset of reperfusion, ameliorated biochemical and histologic acute kidney injury after 24 h. Dexamethasone upregulated Bcl-xL, downregulated ischemia-induced Bax, inhibited caspase-9 and caspase-3 activation, and reduced apoptosis and necrosis of proximal tubular cells. In addition, dexamethasone decreased the number of infiltrating neutrophils and ICAM-1. We observed the protective effect of dexamethasone in neutrophil-depleted mice, suggesting a neutrophil-independent mechanism. In vitro, dexamethasone protected human kidney proximal tubular (HK-2) cells during serum starvation and IRI-induced apoptosis, but inhibition of MEK 1/2 abolished its anti-apoptotic effects in these conditions. Dexamethasone stimulated rapid and transient phosphorylation of ERK 1/2, which required the presence of the glucocorticoid receptor and was independent of transcriptional activity. In summary, in the setting of renal ischemia-reperfusion injury, dexamethasone directly protects against kidney injury by a receptor-dependent, nongenomic mechanism.

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