Abstract
Background
Though significant progress has been made towards new diagnostic approaches for early detection of acute kidney injury (AKI) induced by different factors, there is still an urgent demand for a more specific and predictive biomarker for each type. The aim of this study is to unravel the potential diagnostic utility of circulating osteoprotegerin (OPG) in septic patients who developed AKI in the ICU, compared to cystatin C (a renal function maker) and KIM-1 (a kidney damage marker).
Methods
Eighty patients (male = 43, female = 37) with ages ranging from 42 to 46 years and with sepsis, 40 of whom developed AKI, and 30 healthy controls were enrolled in this prospective study.
Results
Results revealed significant progressive elevation of OPG, along with cystatinCand KIM-1, among sepsis, severe sepsis, and sepsis-AKI patients. The progression of OPG levels paralleled the deterioration of kidney and endothelial functions from sepsis to sepsis-AKI, revealed as progressively increased levels of serum Eselectin (15.3%), endothelin-1 (ET-1) (19.6%), and decreased nitric oxide (NO) (29.7%), associated with elevations of TNF-α (25.5%) and TGF-β (18%). Their comparative prognostic validity of sepsis-AKI was assessed using ROC analysis, which revealed that OPG, KIM-1, and cystatin C showed similar AUCs (0.827-0.83) but with different sensitivities, viz., 84%, 88%, and 92%, respectively. Although cystatin showed 82% specificity, OPG showed a higher, similar specificity to KIM-1 of 85%, indicating its potential function as a marker of renal damage such as KIM-1.
Conclusion
This study revealed a significant elevation of circulating OPG in septic patients with different levels of severity and those who progressed to AKI. Moreover, OPG showed a significant correlation to KIM-1 and cystatin, as well as conventional renal, inflammatory, and endothelial markers. Having a similar specificity to KIM-1, as evidenced by the ROC analysis, OPG has the potential to serve as a reliable biomarker of kidney damage in cases of sepsis-AKI.
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Abbreviations
- AKI:
-
acute kidney injury
- GFR:
-
glomerular filtration rate
- ET-1:
-
endothelin-1
- DN:
-
diabetic nephropathy
- ECM:
-
extracellular matrix
- ICU:
-
intensive care unit
- ICAM-1:
-
intercellular adhesion molecule
- IFN-γ:
-
interferon gamma
- IL:
-
interleukin
- OPG:
-
osteoprotegerin
- KIM-1:
-
kidney injury molecule 1
- NGAL:
-
neutrophil gelatinase-associated lipocalin
- NO:
-
nitric oxide
- iNOS:
-
inducible NO synthase
- eNOS:
-
endothelial NO synthase
- ROC:
-
receiver operating curve
- RANKL:
-
receptor activator of NF-kappa B ligand
- TNF-α:
-
tumor necrosis factor-α
- TNF-R tumor:
-
necrosis factor-α receptor
- TGF-β:
-
transforming growth factor-β
- TNFSF:
-
tumor necrosis factor-α superfamily
- TRAIL:
-
TNF-related apoptosis-inducing ligand
- TWEAK:
-
TNF-like weak inducer of apoptosis
- LPS:
-
lipopolysaccharide
- LBP:
-
lipopolysaccharide binding protein
- WBC:
-
white blood count
- VCAM-1:
-
vascular cell adhesion molecule
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Schaalan, M., Mohamed, W. Predictive ability of circulating osteoprotegerin as a novel biomarker for early detection of acute kidney injury induced by sepsis. Eur Cytokine Netw 28, 52–62 (2017). https://doi.org/10.1684/ecn.2017.0393
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DOI: https://doi.org/10.1684/ecn.2017.0393