Palmitoleate inhibits insulin transcription by activating the ERK1/2 pathway in rat pancreatic β-cells

被引:3
作者
Yang, Yumei [1 ]
Gong, Liangliang [2 ]
机构
[1] Zhejiang Univ, Sch Med, Dept Endocrinol & Metab, Affiliated Hosp 4, Yiwu 322000, Zhejiang, Peoples R China
[2] Zhejiang Univ, Sch Med, Dept Rheumatol, Affiliated Hosp 4, 1 Shangcheng Rd, Yiwu 322000, Zhejiang, Peoples R China
关键词
palmitoleate; insulin; pancreatic and duodenal homeo box 1; extracellular signal-regulated kinase 1/2; phosphorylated extracellular signal-regulated kinase 1/2; phosphorylated-peroxisome proliferator-activated receptor gamma; MONOUNSATURATED FATTY-ACIDS; RECEPTOR-GAMMA; PROTEIN-KINASE; CYTOPROTECTIVE ACTIONS; PALMITATE; EXPRESSION; SECRETION; PDX-1; LINE;
D O I
10.3892/etm.2017.4344
中图分类号
R-3 [医学研究方法]; R3 [基础医学];
学科分类号
1001 ;
摘要
The aim of the present study was to evaluate the effects of palmitoleate on insulin secretion and insulin mRNA levels, and to investigate the transcriptional regulation of insulin. INS-1 rat insulinoma cells were treated with palmitoleate in the presence of high glucose, and the amount of secreted insulin was measured via radioimmunoassay. Reverse transcription-quantitative polymerase chain reaction was performed to evaluate the mRNA levels of insulin and pancreatic and duodenal homeobox 1 (PDX1) under palmitoleate treatment. The levels of PDX1, peroxisome proliferator-activated receptor gamma (PPARG), extracellular signal-regulated kinase (ERK) 1/2 and phosphorylated ERK1/2 were measured using western blot analysis. Low concentrations of palmitoleate significantly induced insulin secretion (P=0.024), whereas the mRNA levels of insulin and PDX1 were markedly reduced. However, the inhibitory effects were reversed with the addition of U0126, suggesting that the ERK1/2-mediated pathway may be the underlying mechanism responsible for palmitoleate-induced downregulation of insulin mRNA. Exposure of INS-1 cells to high glucose significantly increased the phosphorylation of ERK1/2 (P=0.039), which was further enhanced by palmitoleate (P=0.025). Exposure of INS-1 cells to high glucose significantly decreased PPARG (P=0.001), which was further decreased by the addition of palmitoleate. U0126 was able to reverse the palmitoleate-induced effects. In conclusion, the present study suggested that palmitoleate may induce insulin secretion and inhibit insulin mRNA expression in pancreatic beta-cells.
引用
收藏
页码:2805 / 2811
页数:7
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