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LncRNA PLUTO促进胰岛素转录和分泌的作用及机制研究

Mechanism of lncRNA-PLUTO on promoting insulin biosynthesis and secretion

  • 摘要: 探讨长链非编码RNA PLUTO对胰岛β细胞合成及分泌胰岛素作用的影响及机制。利用酶法分离提取db/db、ob/ob及HFD小鼠胰岛细胞,检测PLUTO在不同肥胖模型小鼠胰岛细胞中的表达量;利用糖脂毒性刺激胰岛原代细胞和Min6细胞,检测PLUTO的表达量,阐明肥胖因素诱导PLUTO下调的原因。通过RT-qPCR和ELISA方法分析PLUTO对胰岛素合成及分泌的影响;采用Western blot及功能回复实验阐明PLUTO调控胰岛β细胞的作用机制。结果表明:与正常小鼠相比,PLUTO在肥胖小鼠模型中表达量显著降低;在胰岛原代细胞和Min6细胞中过表达PLUTO促进胰岛合成和分泌;Western blot实验证明PLUTO通过上调相邻基因Pdx1的转录和翻译,促进胰岛素合成及分泌。

     

    Abstract: The aim of this study is to investigate the effect of long non-coding RNA PLUTO on β cell function and its underlying mechanism. Islet cells of db/db, ob/ob and HFD mice were isolated and extracted by enzymatic method to detect the expression of PLUTO in islet cells of different obesity model mice. Glucolipid toxicity was used to stimulate islet primary cells and Min6 cells, and the expression of PLUTO was detected to elucidate the reasons of PLUTO down-regulation induced by obesity factors. RT-qPCR and ELISA were performed to analyze the function of PLUTO on β cells; Western blot and rescue experiments were carried out to elucidate the regulatory mechanism of β cells by PLUTO. The results showed that the expression levels of PLUTO were significantly decreased in obesity model mice compared with control mice; over-expression PLUTO in primary islets and Min6 cells could improve insulin biosynthesis and secretion; Western blot analysis showed that PLUTO promoted insulin secretion and synthesis by up-regulating the transcription and translation of Pdx1, which is the adjacent gene of PLUTO.

     

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