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BMC Nephrology

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Open Access 01-12-2018 | Research article

NGAL protects against endotoxin-induced renal tubular cell damage by suppressing apoptosis

Authors: Mei Han, Ying Li, Di Wen, Maodong Liu, Yuteng Ma, Bin Cong

Published in: BMC Nephrology | Issue 1/2018

Abstract

Background

We sought to confirm that neutrophil gelatinase-associated lipocalin (NGAL) protects against apoptosis during endotoxemia.

Methods

Endotoxemia was induced in rats with lipopolysaccharide (LPS; 3.5 mg/kg) and serum creatinine (SCr), urinary NGAL (uNGAL), renal histopathology confirmed acute kidney injury (AKI). Renal caspase 3 and NGAL were assayed with immunohistochemistry 6 h later. A HK-2 cell model was used in which NGAL and caspase 3 mRNA were evaluated by qRT-PCR within 6 h after LPS (50 μM) treatment, and correlations were studied. NGAL and caspase 3 mRNA expression were measured after delivering NGAL siRNA in HK-2 cells and apoptosis was measured with TUNEL and flow cytometry.

Results

SCr and uNGAL were significantly increased after LPS treatment and renal morphology data indicated AKI and renal tubular epithelial cell apoptosis. Caspase 3 and NGAL were predominantly expressed in the tubular epithelial cells and there was a correlation between caspase 3 and NGAL protein (r = 0.663, p = 0.01). In vitro, there was a strong correlation between caspase 3 and NGAL mRNA in LPS-injured HK-2 cells within 24 h (r = 0.448, p < 0.05). Suppressing the NGAL gene in HK-2 cells increased caspase 3 mRNA 4.5-fold and apoptosis increased 1.5-fold after LPS treatment.

Conclusions

NGAL is associated with caspase 3 in renal tubular cells with endotoxin-induced kidney injury, and may regulate its expression and inhibit apoptosis.

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Title: NGAL protects against endotoxin-induced renal tubular cell damage by suppressing apoptosis
Authors: Mei Han
Ying Li
Di Wen
Maodong Liu
Yuteng Ma
Bin Cong
Publication date: 01-12-2018
Publisher: BioMed Central
Published in: BMC Nephrology / Issue 1/2018
Electronic ISSN: 1471-2369
DOI: https://doi.org/10.1186/s12882-018-0977-3

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