The Duffy antigen receptor for chemokines in acute renal failure: A facilitator of renal chemokine presentation.

Abstract:

OBJECTIVE:Acute renal failure remains a major challenge in critical care medicine. Both neutrophils and chemokines have been proposed as key components in the development of acute renal failure. Although the Duffy antigen receptor for chemokines (DARC) is present in several tissues and a highly specific ligand for various chemokines, its exact role in vivo remains unclear. DESIGN:Prospective, controlled experimental study. SETTING:University-based research laboratory. SUBJECTS:C57BL/6 wild-type and DARC gene-deficient mice (DARC-/-). INTERVENTIONS:To unravel the functional relevance of DARC in vivo, we compared wild-type and DARC-/- using neutrophil-dependent models of acute renal failure, induced by either local (renal ischemia-reperfusion) or systemic (endotoxemia, lipopolysaccharide) injury. MEASUREMENTS AND MAIN RESULTS:Plasma creatinine and blood urea nitrogen concentrations served as indicators of renal function or dysfunction. Enzyme-linked immunosorbent assays were used to measure tissue and plasma chemokine concentrations. We also performed immunostaining to localize chemokine expression and flow cytometry to evaluate neutrophil recruitment into the kidney. Following renal injury, wild-type mice developed moderate renal ischemia-reperfusion(lipopolysaccharide, 300% increase in plasma creatinine concentrations) to severe acute renal failure (renal ischemia-reperfusion, 40% mortality) as well as extensive renal neutrophil recruitment. DARC-/- mice exhibited no renal dysfunction (renal ischemia-reperfusion) or only very mild renal dysfunction (lipopolysaccharide, 20% increase in serum creatinine concentrations). DARC-/- mice showed no postischemic neutrophil infiltration. Although DARC-/- and wild-type mice exhibited similar global renal neutrophil-recruitment during endotoxemia, DARC-/- mice showed significantly impaired neutrophil extravasation. Total renal concentrations of the chemokine macrophage inflammatory protein 2, which has been shown to bind to DARC and to be crucial in postischemic acute renal failure, were either identical (lipopolysaccharide) or only moderately different (renal ischemia-reperfusion) between wild-type and DARC-/- mice. Immunostaining revealed an absence of macrophage inflammatory protein-2 in renal endothelial cells of DARC-/- mice. CONCLUSIONS:We suggest that DARC predominantly exerts its effects by controlling spatial chemokine distribution, which in turn regulates neutrophil recruitment and subsequent acute renal failure.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

Zarbock A,Schmolke M,Bockhorn SG,Scharte M,Buschmann K,Ley K,Singbartl K

doi

10.1097/01.ccm.0000280570.82885.32

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

2156-63

issue

9

eissn

0090-3493

issn

1530-0293

journal_volume

35

pub_type

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