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Vol. 26, No. 1, 2006
Issue release date: April 2006
Am J Nephrol 2006;26:22–33

Acute-on-Chronic Renal Failure in the Rat: Functional Compensation and Hypoxia Tolerance

Goldfarb M. · Rosenberger C. · Abassi Z. · Shina A. · Zilbersat F. · Eckardt K.U. · Rosen S. · Heyman S.N.
aNephrology Unit, Bikur Holim Hospital, Jerusalem, bDepartment of Physiology, the Technion Medical School, Haifa, and cDepartment of Medicine, Hadassah-Hebrew University Hospital, Mt. Scopus, Jerusalem, Israel; dDepartment of Nephrology and Critical Care, Charité University Clinic, Berlin, and eDivision of Nephrology and Hypertension, University of Erlangen-Nuremberg, Erlangen-Nuremberg, Germany; fDepartment of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Mass., USA

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Background: We hypothesized that chronic renal parenchymal disease may predispose to acute renal failure (ARF), facilitating the induction of hypoxic medullary tubular injury. Methods: To induce chronic renal parenchymal injury, rats underwent sham operation (control) or bilateral 50-min clamping of the renal artery [ischemia-reperfusion (IR)]. One or 3 months later, both groups were subjected to an ARF protocol, consisting of radiocontrast and the inhibition of prostaglandin and nitric oxide synthesis. Renal function and morphology were determined 24 h later. Results: Chronic tubulointerstitial changes (fibrosis, atrophy and hypertrophy) in the IR group correlated with baseline tubular function, but glomerular function was preserved. Functional deterioration after the ARF protocol was only marginally more pronounced in the IR group, and the degree of medullary acute tubular necrosis (ATN) was unaffected by prior IR. The extent of both tubular necrosis and chronic tubulointerstitial changes independently predicted the acute decline in renal function. Immunostaining of IR kidneys disclosed critically low medullary pO2 (determined by pimonidazole adducts), regional hypoxic cell response (hypoxia-inducible factors) and upregulation of endothelin-B receptors. Conclusions: Compensatory changes result in normal plasma creatinine 1 and 3 months after IR, despite diminished tubular function. Preexisting renal disease only marginally predisposes to ARF, and the extent of ATN is not significantly enhanced. These findings illustrate the complex interaction between chronic and acute renal injury and dysfunction and parallel the difficulty of their assessment in the clinical practice. Adaptive cellular responses to chronic hypoxia in conjunction with parenchymal loss and decreased oxygen demand might alleviate acute hypoxic injury.

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