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      Kidney Injury Molecule-1 Outperforms Traditional Biomarkers of Kidney Injury in Multi-site Preclinical Biomarker Qualification Studies

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          Abstract

          Kidney toxicity accounts for a significant percentage of morbidity and drug candidate failure. Serum creatinine (SCr) and blood urea nitrogen (BUN) have been used to monitor kidney dysfunction for over a century but these markers are insensitive and non-specific. In multi-site preclinical rat toxicology studies the diagnostic performance of urinary kidney injury molecule-1 (Kim-1) was compared to traditional biomarkers as predictors of kidney tubular histopathologic changes, currently considered the “gold standard” of nephrotoxicity. In multiple models of kidney injury, urinary Kim-1 significantly outperformed SCr and BUN. The area under the receiver operating characteristic curve for Kim-1 was between 0.91 and 0.99 as compared to 0.79 to 0.9 for BUN and 0.73 to 0.85 for SCr. Thus urinary Kim-1 is the first injury biomarker of kidney toxicity qualified by the FDA and EMEA and is expected to significantly improve kidney safety monitoring.

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          Most cited references23

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          Acute kidney injury, mortality, length of stay, and costs in hospitalized patients.

          The marginal effects of acute kidney injury on in-hospital mortality, length of stay (LOS), and costs have not been well described. A consecutive sample of 19,982 adults who were admitted to an urban academic medical center, including 9210 who had two or more serum creatinine (SCr) determinations, was evaluated. The presence and degree of acute kidney injury were assessed using absolute and relative increases from baseline to peak SCr concentration during hospitalization. Large increases in SCr concentration were relatively rare (e.g., >or=2.0 mg/dl in 105 [1%] patients), whereas more modest increases in SCr were common (e.g., >or=0.5 mg/dl in 1237 [13%] patients). Modest changes in SCr were significantly associated with mortality, LOS, and costs, even after adjustment for age, gender, admission International Classification of Diseases, Ninth Revision, Clinical Modification diagnosis, severity of illness (diagnosis-related group weight), and chronic kidney disease. For example, an increase in SCr >or=0.5 mg/dl was associated with a 6.5-fold (95% confidence interval 5.0 to 8.5) increase in the odds of death, a 3.5-d increase in LOS, and nearly 7500 dollars in excess hospital costs. Acute kidney injury is associated with significantly increased mortality, LOS, and costs across a broad spectrum of conditions. Moreover, outcomes are related directly to the severity of acute kidney injury, whether characterized by nominal or percentage changes in serum creatinine.
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            Kidney injury molecule-1 (KIM-1), a putative epithelial cell adhesion molecule containing a novel immunoglobulin domain, is up-regulated in renal cells after injury.

            We report the identification of rat and human cDNAs for a type 1 membrane protein that contains a novel six-cysteine immunoglobulin-like domain and a mucin domain; it is named kidney injury molecule-1 (KIM-1). Structurally, KIM-1 is a member of the immunoglobulin gene superfamily most reminiscent of mucosal addressin cell adhesion molecule 1 (MAdCAM-1). Human KIM-1 exhibits homology to a monkey gene, hepatitis A virus cell receptor 1 (HAVcr-1), which was identified recently as a receptor for the hepatitis A virus. KIM-1 mRNA and protein are expressed at a low level in normal kidney but are increased dramatically in postischemic kidney. In situ hybridization and immunohistochemistry revealed that KIM-1 is expressed in proliferating bromodeoxyuridine-positive and dedifferentiated vimentin-positive epithelial cells in regenerating proximal tubules. Structure and expression data suggest that KIM-1 is an epithelial cell adhesion molecule up-regulated in the cells, which are dedifferentiated and undergoing replication. KIM-1 may play an important role in the restoration of the morphological integrity and function to postischemic kidney.
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              Kidney injury molecule-1: a tissue and urinary biomarker for nephrotoxicant-induced renal injury.

              Nephrotoxicity is a common side effect of therapeutic interventions, environmental insults, and exposure to toxicants in the workplace. Although biomarkers for nephrotoxicity are available, they often lack sensitivity and are not specific as indicators of epithelial cell injury. Kidney injury molecule-1 (Kim-1) is a type 1 membrane protein with extracellular immunoglobulin and mucin domains. The mRNA and protein for Kim-1 are expressed at very low levels in normal rodent kidney, but expression increases dramatically after injury in proximal tubule epithelial cells in postischemic rodent kidney and in humans during ischemic acute renal failure. To evaluate the utility of Kim-1 as a biomarker for other types of renal injury, we analyzed tissue and urinary expression in response to three different types of nephrotoxicants in the rat: S-(1,1,2,2-tetrafluoroethyl)-l-cysteine (TFEC), folic acid, and cisplatin. Marked increases in Kim-1 expression were confirmed by immunoblotting in all three models. The protein was shown to be localized to the proximal tubule epithelial cell by immunofluorescence. Furthermore, Kim-1 protein was detected in urine of toxicant-treated rats. The temporal pattern of expression in response to TFEC is similar to the Kim-1 expression pattern in the postischemic kidney. In folic acid-treated kidneys, Kim-1 is clearly localized to the apical brush border of the well-differentiated proximal tubular epithelial cells. After folic acid treatment, expression of Kim-1 is present in the urine despite no significant increase in serum creatinine. Cisplatin treatment results in early detection of urinary Kim-1 protein and diffuse Kim-1 expression in S3 cells of the proximal tubule. Kim-1 can be detected in the tissue and urine on days 1 and 2 after cisplatin administration, occurring before an increase in serum creatinine. The upregulation of expression of Kim-1 and its presence in the urine in response to exposure to various types of nephrotoxicants suggest that this protein may serve as a general biomarker for tubular injury and repair processes.
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                Author and article information

                Journal
                9604648
                20305
                Nat Biotechnol
                Nature biotechnology
                1087-0156
                1546-1696
                17 May 2010
                May 2010
                1 November 2010
                : 28
                : 5
                : 478-485
                Affiliations
                [1 ]Renal Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115
                [2 ]Merck Research Laboratories, Safety Assessment, West Point, PA, 19486
                [3 ]Translational Sciences, Novartis Institutes for BioMedical Research, Basel, Switzerland
                [4 ]Molecular Physiology Unit, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México and Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
                [5 ]Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, Maryland 20993
                Author notes
                []Correspondence may be addressed to: Vishal S. Vaidya, PhD, Brigham and Women's Hospital, Harvard Medical School, Harvard Institutes of Medicine, Renal Division, Rm 550, 4 Blackfan circle, Boston, MA 02115. Tel: 617-525-5974. Fax: 617-525-5965. vvaidya@ 123456partners.org ; Josef S. Ozer, PhD, Merck Research Laboratories, Safety Assessment, West Point, PA 19486. Tel: 215-652-5100, josef_ozer@ 123456merck.com .; Frank Dieterle, PhD, Translational Sciences, Novartis Institutes for BioMedical Research, CH-4002 Basel, Switzerland. Tel: +41-616961980, frank.dieterle@ 123456novartis.com
                Article
                nihpa190939
                10.1038/nbt.1623
                2885849
                20458318
                e556e1a5-c8b4-4e74-8404-3e8a7a6909f6

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                History
                Funding
                Funded by: National Institute of Diabetes and Digestive and Kidney Diseases : NIDDK
                Funded by: National Institute of Environmental Health Sciences : NIEHS
                Award ID: R33 DK074099-05S1 ||DK
                Funded by: National Institute of Diabetes and Digestive and Kidney Diseases : NIDDK
                Funded by: National Institute of Environmental Health Sciences : NIEHS
                Award ID: R01 DK072381-05 ||DK
                Funded by: National Institute of Diabetes and Digestive and Kidney Diseases : NIDDK
                Funded by: National Institute of Environmental Health Sciences : NIEHS
                Award ID: R01 DK039773-26 ||DK
                Funded by: National Institute of Diabetes and Digestive and Kidney Diseases : NIDDK
                Funded by: National Institute of Environmental Health Sciences : NIEHS
                Award ID: R00 ES016723-03S1 ||ES
                Funded by: National Institute of Diabetes and Digestive and Kidney Diseases : NIDDK
                Funded by: National Institute of Environmental Health Sciences : NIEHS
                Award ID: R00 ES016723-03 ||ES
                Funded by: National Institute of Diabetes and Digestive and Kidney Diseases : NIDDK
                Funded by: National Institute of Environmental Health Sciences : NIEHS
                Award ID: R00 ES016723-02 ||ES
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                Biotechnology
                Biotechnology

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