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Urinary L-Type Fatty Acid-Binding Protein as a New Renal Biomarker

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Abstract

Fatty acid-binding proteins (FABPs) are a group of intracellular proteins of 14 kDa, belonging to the lipocalin family. FABPs play a key role in the binding and trafficking of fatty acids and some other hydrophobic molecules. In the human kidney, liver-type FABP (L-FABP) is expressed in the proximal tubule. L-FABP expression and secretion into urine is increased during tubulointerstitial damage in the kidney. Our research laboratory has developed L-FABP ELISA kit for diagnostic use in Japan. This chapter provides a brief summary of the urinary L-FABP monitoring with particular emphasis on its important roles in recent clinical studies (e.g., diabetic nephropathy, non-diabetic nephropathy, contrast-induced acute kidney injury, septic shock, kidney transplant, pediatric acute kidney injury).

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Abbreviations

ACE:

Angiotensin converting enzyme

ADPKD:

Autosomal dominant polycystic kidney disease

AER:

Albumin excretion rate

AKI:

Acute kidney injury

AKIN:

Acute Kidney Injury Network

APACHE:

Acute physiology and chronic health evaluation

ARB:

Angiotensin II receptor blocker

ARF:

Acute renal failure

AUC:

Area under the curve

BSA:

Bovine serum albumin

CCD:

Charge coupled devices

CI-AKI:

Contrast-induced acute kidney injury

CKD:

Chronic kidney disease

CPB:

Cardiopulmonary bypass

DN:

Diabetic nephropathy

ELISA:

Enzyme-linked immunosorbent assay

FABP:

Fatty acid-binding protein

FFA:

Free fatty acid

FGS:

Focal glomerulosclerosis

HIF:

Hypoxia-inducible factor

HNF:

Hepatocyte nuclear factor

ICU:

Intensive care unit

IL-18:

Interleukin-18

IVD:

In vitro diagnostics

KDIGO:

Kidney Disease Improving Global Outcomes

KIM-1:

Kidney injury molecule-1

LDL:

Low-density lipoprotein

L-FABP:

Liver-type fatty acid-binding protein

MCNS:

Minimal change nephrotic syndrome

MG:

Microglobulin

NAG:

N-acetyl-β-d-glucosaminidase

NGAL:

Neutrophil gelatinase-associated lipocalin

8-OHdG:

8-Hydroxydeoxyguanosine

pAKI:

Pediatric acute kidney injury

PMX-F:

Polymyxin B-immobilized fiber

PPAR:

Peroxisome proliferator-activated receptor

ROC:

Receiver operating characteristic

UAE:

Urinary albumin excretion

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Acknowledgments

The authors thank Dr. Kenjiro Kimura and Dr. Atsuko Kamijo-Ikemori (Department of Nephrology and Hypertension, Internal Medicine, St. Marianna University School of Medicine, Kanagawa, Japan), Dr. Yasuhiko Tomino and Dr. Yusuke Suzuki (Division of Nephrology, Department of Internal Medicine, Juntendo University Faculty of Medicine, Tokyo, Japan) for scientific encouragement and helpful discussions.

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Correspondence to Takeshi Sugaya Ph.D. .

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Oikawa, T., Sugaya, T. (2014). Urinary L-Type Fatty Acid-Binding Protein as a New Renal Biomarker. In: Tsukahara, H., Kaneko, K. (eds) Studies on Pediatric Disorders. Oxidative Stress in Applied Basic Research and Clinical Practice. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-0679-6_7

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