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Pinocembrin ameliorates lipopolysaccharide-induced HK-2 cell apoptosis and inflammation by regulating endoplasmic reticulum stress

Pinocembrin (PINO) is a natural flavonoid drug that possesses a range of biological activities, including antimicrobial, antioxidant and anti-inflammatory activities. The specific aim of the present study was to examine the pharmacological role of PINO in sepsis-mediated acute kidney injury (AKI), a...

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Autores principales: Zhang, Yu, Yu, Chenxi, Feng, Yi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: D.A. Spandidos 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9257947/
https://www.ncbi.nlm.nih.gov/pubmed/35837041
http://dx.doi.org/10.3892/etm.2022.11440
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author Zhang, Yu
Yu, Chenxi
Feng, Yi
author_facet Zhang, Yu
Yu, Chenxi
Feng, Yi
author_sort Zhang, Yu
collection PubMed
description Pinocembrin (PINO) is a natural flavonoid drug that possesses a range of biological activities, including antimicrobial, antioxidant and anti-inflammatory activities. The specific aim of the present study was to examine the pharmacological role of PINO in sepsis-mediated acute kidney injury (AKI), as well as to investigate the potential underlying mechanism. Human renal tubular epithelial cells (of the HK-2 cell line) were stimulated with lipopolysaccharide (LPS) for 24 h to simulate septic AKI in vitro, after which the experiments were repeated and the cells were pretreated with increasing concentrations of PINO (0, 50, 100 and 200 µg/ml). Using an MTT cell viability assay, PINO was revealed to be non-toxic to HK-2 cells. In LPS-treated HK-2 cells, PINO alleviated the loss of cell viability. Western blotting was used to analyze the expression levels of pro-inflammatory cytokines, including IL-1β, IL-6 and TNF-α, and the results revealed that PINO decreased the expression levels of these cytokines in a concentration-dependent manner. Furthermore, malondialdehyde (MDA) and glutathione (GSH) activities were assessed using MDA and GSH assay kits and it was revealed that PINO decreased the significantly increased level of malondialdehyde, while it also decreased the reduction in the level of GSH in LPS-challenged HK-2 cells. In addition, a TUNEL assay and western blotting were performed to examine cell apoptosis, and PINO was identified to significantly inhibit the level of apoptosis in LPS-induced HK-2 cells. Subsequently, the expression levels of endoplasmic reticulum stress (ERS)-associated factors, including activating transcription factor 4, C/EBP homologous protein and phosphorylated/total eukaryotic translation initiation factor 2 subunit 1 were examined by western blotting and it was demonstrated that ERS was triggered in HK-2 cells exposed to LPS, although this was partly circumvented through PINO treatment in a concentration-dependent manner. Furthermore, after the addition of tunicamycin, which acts as an agonist of ERS, the aforementioned experiments were performed again. Tunicamycin led to partial abolition of the protective function of PINO against inflammation, oxidative stress and apoptosis in LPS-challenged HK-2 cells. Overall, the results of the present study demonstrated that PINO was able to ameliorate the injuries sustained by LPS-challenged HK-2 cells via modulating ERS to reduce inflammation, oxidative stress and apoptosis; therefore, PINO may be a novel candidate drug for treating septic AKI.
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spelling pubmed-92579472022-07-13 Pinocembrin ameliorates lipopolysaccharide-induced HK-2 cell apoptosis and inflammation by regulating endoplasmic reticulum stress Zhang, Yu Yu, Chenxi Feng, Yi Exp Ther Med Articles Pinocembrin (PINO) is a natural flavonoid drug that possesses a range of biological activities, including antimicrobial, antioxidant and anti-inflammatory activities. The specific aim of the present study was to examine the pharmacological role of PINO in sepsis-mediated acute kidney injury (AKI), as well as to investigate the potential underlying mechanism. Human renal tubular epithelial cells (of the HK-2 cell line) were stimulated with lipopolysaccharide (LPS) for 24 h to simulate septic AKI in vitro, after which the experiments were repeated and the cells were pretreated with increasing concentrations of PINO (0, 50, 100 and 200 µg/ml). Using an MTT cell viability assay, PINO was revealed to be non-toxic to HK-2 cells. In LPS-treated HK-2 cells, PINO alleviated the loss of cell viability. Western blotting was used to analyze the expression levels of pro-inflammatory cytokines, including IL-1β, IL-6 and TNF-α, and the results revealed that PINO decreased the expression levels of these cytokines in a concentration-dependent manner. Furthermore, malondialdehyde (MDA) and glutathione (GSH) activities were assessed using MDA and GSH assay kits and it was revealed that PINO decreased the significantly increased level of malondialdehyde, while it also decreased the reduction in the level of GSH in LPS-challenged HK-2 cells. In addition, a TUNEL assay and western blotting were performed to examine cell apoptosis, and PINO was identified to significantly inhibit the level of apoptosis in LPS-induced HK-2 cells. Subsequently, the expression levels of endoplasmic reticulum stress (ERS)-associated factors, including activating transcription factor 4, C/EBP homologous protein and phosphorylated/total eukaryotic translation initiation factor 2 subunit 1 were examined by western blotting and it was demonstrated that ERS was triggered in HK-2 cells exposed to LPS, although this was partly circumvented through PINO treatment in a concentration-dependent manner. Furthermore, after the addition of tunicamycin, which acts as an agonist of ERS, the aforementioned experiments were performed again. Tunicamycin led to partial abolition of the protective function of PINO against inflammation, oxidative stress and apoptosis in LPS-challenged HK-2 cells. Overall, the results of the present study demonstrated that PINO was able to ameliorate the injuries sustained by LPS-challenged HK-2 cells via modulating ERS to reduce inflammation, oxidative stress and apoptosis; therefore, PINO may be a novel candidate drug for treating septic AKI. D.A. Spandidos 2022-06-14 /pmc/articles/PMC9257947/ /pubmed/35837041 http://dx.doi.org/10.3892/etm.2022.11440 Text en Copyright: © Zhang et al. https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License (https://creativecommons.org/licenses/by-nc-nd/4.0/) , which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
spellingShingle Articles
Zhang, Yu
Yu, Chenxi
Feng, Yi
Pinocembrin ameliorates lipopolysaccharide-induced HK-2 cell apoptosis and inflammation by regulating endoplasmic reticulum stress
title Pinocembrin ameliorates lipopolysaccharide-induced HK-2 cell apoptosis and inflammation by regulating endoplasmic reticulum stress
title_full Pinocembrin ameliorates lipopolysaccharide-induced HK-2 cell apoptosis and inflammation by regulating endoplasmic reticulum stress
title_fullStr Pinocembrin ameliorates lipopolysaccharide-induced HK-2 cell apoptosis and inflammation by regulating endoplasmic reticulum stress
title_full_unstemmed Pinocembrin ameliorates lipopolysaccharide-induced HK-2 cell apoptosis and inflammation by regulating endoplasmic reticulum stress
title_short Pinocembrin ameliorates lipopolysaccharide-induced HK-2 cell apoptosis and inflammation by regulating endoplasmic reticulum stress
title_sort pinocembrin ameliorates lipopolysaccharide-induced hk-2 cell apoptosis and inflammation by regulating endoplasmic reticulum stress
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9257947/
https://www.ncbi.nlm.nih.gov/pubmed/35837041
http://dx.doi.org/10.3892/etm.2022.11440
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