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  • Title: Neutrophil gelatinase-associated lipocalin and end-stage renal disease: it is not all about the kidneys!
    Author: Rau S, Habicht A, Kauke T, Hillmer A, Wessely M, Stangl M, Guba M, Fischereder M, Schönermarck U.
    Journal: Eur J Clin Invest; 2013 Aug; 43(8):816-20. PubMed ID: 23710757.
    Abstract:
    INTRODUCTION: Neutrophil gelatinase-associated lipocalin (NGAL) is a powerful biomarker for the early detection of acute kidney injury. However, recent data suggest that NGAL also plays an important role in chronic kidney disease (CKD), reflecting the level of acute kidney damage within the CKD condition. To study whether elevated NGAL levels in CKD are a consequence of damaged tubular cells or rather due to extrarenal production, we investigated NGAL levels in anephric patients on dialysis. METHODS: Plasma NGAL levels were investigated in 14 dialysis patients who underwent bilateral nephrectomy (anephric group), 18 anuric dialysis patients with remaining kidneys (dialysis group) and 12 healthy patients (healthy group). RESULTS: Plasma NGAL levels were significantly lower in the healthy group compared with the anephric group (143 vs. 981 ng/mL; P < 0·001) or the dialysis group (143 vs. 838 ng/mL; P < 0·001), respectively. However, NGAL levels did not differ between the anephric group and the dialysis group (981 vs. 838 ng/mL; P = 0·19). DISCUSSION: Assuming that NGAL is highly expressed in chronically damaged kidneys due to tubular stress, there should be significantly less NGAL in anephric patients compared with anuric dialysis patients with remaining kidneys. In contrast to this hypothesis, we found no difference in NGAL expression between these two groups, proving the entire extrarenal NGAL production in anephric patients and suggesting that the tubular NGAL expression seems to be negligible in anuric dialysis patients.
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