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[Protective effect and mechanism of neutrophil gelatinase-associated lipocalin against hypoxia/reoxygenation injury of HK-2 renal tubular epithelial cells].
Xi Bao Yu Fen Zi Mian Yi Xue za Zhi = Chinese Journal of Cellular and Molecular Immunology 2016 October
Objective To study the role of neutrophil gelatinase-associated lipocalin (NGAL) in hypoxia/reoxygenation injury and its regulatory effect on autophagy in HK-2 renal tubular epithelial cells. Methods Three sets of designed NGAL short-hairpin RNA (shRNA) sequences were synthesized and transfected into HK-2 cells. The expression levels of NGAL mRNA and protein were analyzed by quantitative real-time PCR and Western blotting, respectively. Then, the HK-2 cells with the best NGAL mRNA interference were selected to establish the hypoxia/reoxygenation model. The levels of microtubule-associated protein 1 light chain 3II (LC-3II) and beclin-1 were detected by Western blotting. Besides, the viability of cells was tested by Cell Titer-Blue and CCK-8 assay. Results Three sets of shRNA plasmids carrying silenced NGAL gene were successfully constructed and transfected into HK-2 cells. The expressions of NGAL mRNA and protein in these cells were significantly lower than those in the controls with blank vector. After NGAL-silenced HK-2 cells were subjected to hypoxia/reoxygenation, the levels of LC-3 II and beclin-1 were lower than those in the controls with blank vector, whereas the levels of LC-3 II and beclin-1 in were higher than those in the ones in which 400 ng/mL recombinant NGAL was added. Cell Titer-Blue and CCK-8 assays showed that the viability of NGAL-knockdown HK-2 cells was significantly lower than the controls. Conclusion NGAL may plays protective role towards HK-2 cells in the process of hypoxia/reoxygenation by enhancing autophagy.
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