Gastroenterology:Let-7b和miR-495有助于腺泡细胞的稳定分化

2013-09-10 吴军 编译 医学论坛网

胰腺外分泌疾病通常与胰腺腺泡细胞分化异常有关。 MicroRNAs (miRNAs)调节胰腺的生长分化,但对于胰腺腺泡细胞分化是否有影响知之甚少。近日,来自比利时鲁汶大学的Pierre-Paul Prevot等研究了miRNAs在促进和控制腺泡细胞稳定分化方面的作用;研究显示Let-7b、miR-495和它们的靶基因构成了一个建立和维持胰腺腺泡细胞分化的基因网

胰腺外分泌疾病通常与胰腺腺泡细胞分化异常有关。 MicroRNAs (miRNAs)调节胰腺的生长分化,但对于胰腺腺泡细胞分化是否有影响知之甚少。

近日,来自比利时鲁汶大学的Pierre-Paul Prevot等研究了miRNAs在促进和控制腺泡细胞稳定分化方面的作用;研究显示Let-7b、miR-495和它们的靶基因构成了一个建立和维持胰腺腺泡细胞分化的基因网络。关于该基因网络的其他研究有助于提高对胰腺疾病的了解。该文近日发表于《胃肠病学》杂志(Gastroenterology.145:668-678)。【原文下载】

研究者以胰腺的或腺泡的Dicer特异性失活的小鼠 (Foxa3-Cre/DicerloxP/−鼠),联合(或不)肝细胞核因子(HNF) 6失活的鼠 (Foxa3-Cre/DicerloxP/−/Hnf6−/−鼠)作为研究对象;采用miRNA抑制剂转染培养的细胞来探索特定miRNAs在胰腺腺泡分化中的作用。并通过给小鼠服用蛙皮素来探索胰腺炎诱导的化生机制。

研究结果显示腺泡中失活Dicer来抑制miRNA合成以及胰腺炎诱导的化生,与抑制腺泡分化和诱导HNF6和肝基因有关;Dicer缺乏的腺泡的表现型依赖于诱导HNF6;在生长中的胰腺细胞中过表达该因子可以充分的抑制腺泡分化和诱导肝基因;Let-7b和miR-495抑制 HNF6及在生长中腺泡中表达。在Dicer缺乏的腺泡中以及胰腺炎诱导的化生中,该表达被抑制。除此之外,在腺泡细胞中抑制Let-7b和miR-495表达,可以发现与Dicer缺乏的腺泡和化生细胞中产生相似的效果,也就是诱导HNF6和肝基因和抑制腺泡的分化。

原文下载

Prévot PP, Augereau C, Simion A, Van den Steen G, Dauguet N, Lemaigre FP, Jacquemin P.Let-7b and miR-495 Stimulate Differentiation and Prevent Metaplasia of Pancreatic Acinar Cells by Repressing HNF6.Gastroenterology. 2013 Sep;145(3):668-678.

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    2014-03-29 许安
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    2013-12-30 smallant2002
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