炎性细胞因子TNF-α对胰淀素表达的上调作用及分子机制

2010-12-30 MedSci原创 MedSci原创

最近,国际学术期刊Diabetologia在线发表了上海生科院营养所乐颖影研究组的最新研究成果:TNF-α acutely upregulates amylin expression in murine pancreatic beta cells。这项工作主要由博士生蔡坤等在乐颖影研究员的指导下完成。  胰淀素(amylin),又称胰岛淀粉样多肽(islet amyloid polyp

最近,国际学术期刊Diabetologia在线发表了上海生科院营养所乐颖影研究组的最新研究成果:TNF-α acutely upregulates amylin expression in murine pancreatic beta cells。这项工作主要由博士生蔡坤等在乐颖影研究员的指导下完成。

 胰淀素(amylin),又称胰岛淀粉样多肽(islet amyloid polypeptide),最初是从2型糖尿病病人的胰岛淀粉样沉淀中分离发现的。胰淀素主要由胰岛β细胞合成和分泌,具有控制食欲、抑制胃排空、抑制胰岛素分泌等生理功能。离体和整体实验表明,胰淀素能诱导胰岛素抵抗、促进胰岛b细胞凋亡,参与2型糖尿病的发生发展。近年来发现在急性胰腺炎、胰腺移植后发生排斥的病人、肥胖症和胰岛素抵抗症患者,血浆胰淀素水平显著升高,但其原因及机制尚不清楚。

炎性细胞因子(如TNF-α、MCP-1等)在上述疾病的胰腺组织或血循环中显著升高,它们不仅在急性胰腺炎和移植排斥中发挥重要作用,还参与胰岛素抵抗和糖尿病的发生发展。蔡坤等利用小鼠胰岛b细胞株MIN6和原代培养小鼠胰岛,研究了炎性细胞因子对胰淀素表达的影响。发现TNF-α能够显著上调胰淀素基因的表达,这种调节作用呈时间和浓度依赖性。TNF-α还能促进胰淀素蛋白的合成,主要以胰淀素前体蛋白及其酶切中间产物为主。通过生化和分子生物学的多种研究手段进一步探讨了TNF-α发挥调节作用的机制,发现TNF-α通过PKCζ-ERK1/2/JNK-AP1和PI3K-NF-κB相关信号通路上调胰淀素基因的表达。此外还发现,TNF-α能显著增强人胰淀素基因启动子的活性,且这种调节作用由AP1和NF-κB介导,说明人胰淀素基因的表达和小鼠胰淀素基因一样受TNF-α调节。这些结果提示在胰腺急性炎症相关疾病,炎性细胞因子除直接发挥作用外,还可能通过诱导胰淀素表达而促进疾病的发展,为进一步探讨胰淀素的病理作用提供了新的线索。

此项工作得到国家科技部和上海市科委经费资助。(营养所)

炎性细胞因子TNF-α对胰淀素表达的上调作用及分子机制

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    2015-02-28 xiaoai5777

    不错的文章,学习了

    0

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    2011-06-07 zhangph
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    2011-01-01 snowpeakxu