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• W304386099 abstract "Fetuin A (FetA), a secreted glycoprotein, is known to affect inflammation and insulin resistance (IR) in obese humans and animals. Lipotoxicity from chronic hyperlipidemia damages pancreatic β cells, hastening the onset of diabetes. We sought to determine whether FetA promotes lipotoxicity through modulation of the toll-like receptor 4 (TLR4) inflammatory signaling pathway as well as the protective effect of pioglitazone(PIO) on lipotoxicity.βTC6, a glucose-sensitive mouse pancreatic β cell line, and Sprague-Dawley rats with diet-induced obesity, were used to investigate FetA-mediated lipotoxicity. Protein expression/activation were measured by Western blotting. Small interfering (si)RNAs for TLR4 were used. Cell apoptosis was quantified by TUNEL analysis or flow cytometry, respectively. Insulin release was assessed with an insulin ELISA.FetA dose-dependently aggravated palmitic acid (PA)-induced βTC6 cell apoptosis, insulin secretion impairment, and inhibition of the expression of G-protein-coupled receptor 40 (GPR40) and pancreatic duodenal homeobox-1(PDX-1). Combined FetA + PA induced TLR4 expression, and subsequent inhibition of TLR4 signaling or expression was shown to prevent the strengthening effect of FetA on PA-induced lipotoxicity in βTC6 cells. FetA + PA induced p-JNK and nuclear factor-κB (NF-κB) subunit P65 expression, and inhibition of this activity reduced PA+ FetA lipotoxicity in βTC6 cells. PIO could ameliorate PA+ FetA-induced damage to βTC6 cells. Similarly, PIO improved insulin secretion disorder, reduced apoptosis, decreased FetA, TLR4, p-JNK, NF-κB subunit P65 and cleaved caspase 3 expression, and increased GPR40 and PDX-1 expression in islet β cells of diet-induced obese rats. The correlative bivariate analysis showed that increases in Fetuin A were directly proportional to the development of β cell injury.FetA can promote lipotoxicity in β cells through the TLR4-JNK-NF-κB signaling pathway. The protective effects of PIO on lipotoxicity in β cells may involve the inhibition of the activation of the FetA and TLR4 signaling pathway." @default.
• W304386099 created "2016-06-24" @default.
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• W304386099 date "2015-09-01" @default.
• W304386099 modified "2023-10-03" @default.
• W304386099 title "Fetuin A promotes lipotoxicity in β cells through the TLR4 signaling pathway and the role of pioglitazone in anti-lipotoxicity" @default.
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• W304386099 doi "https://doi.org/10.1016/j.mce.2015.05.014" @default.
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