转录因子ChREBP-α增强小鼠原代肝细胞的脂质合成能力
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国家杰出青年科学基金(31025013),国家自然科学基金(81100614).


Transcription factor ChREBP-α enhances lipogenesis of primary hepatocytes
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Supported by National Science Foundation for Distinguished Young Scholars (31025013), and National Natural Science Foundation of China(81100614).

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    摘要:

    目的 构建含转录因子ChREBP-α基因的重组腺病毒载体,检测其在小鼠原代肝细胞中的表达及其对脂质合成的调节作用。方法ChREBP-α cDNA克隆到穿梭质粒pShuttle-CMV载体,与pAdEasy质粒在大肠杆菌BJ5183中同源重组,获得腺病毒载体pAd-ChREBP-α,在293A 细胞中进行病毒的包装和扩增,检测病毒的滴度; 将腺病毒Ad-ChREBP-α感染小鼠原代肝细胞,用实时荧光定量PCR及蛋白质印迹法检测ChREBP-α的表达,实时荧光定量PCR检测ChREBP-α靶基因LPK mRNA的表达。用核素14C示踪法测定肝细胞的脂质合成速率。结果 成功制备了ChREBP-α重组腺病毒,利用其在原代肝细胞过表达ChREBP-α,可显著上调靶基因LPK的表达,并增强肝细胞的脂质合成速率。结论 成功制备了具有生物学活性、能在原代肝细胞中过表达的ChREBP-α重组腺病毒,为研究ChREBP-α的糖脂代谢调控作用奠定了基础。

    Abstract:

    Objective To construct recombinant adenovirus expressing mouse ChREBP-α, and examine the effect of ChREBP-α overexpression on lipid synthesis in mouse primary hepatocytes. Methods The mouse ChREBP-α cDNA was subcloned into pShuttle-CMV vector, and the product was transformed into E. coli strain BJ5183 for homologous recombination with pAdEasy-1.The resultant recombinant vector was transfected into 293A cells for viral package. Mouse primary hepatocytes were infected with adenoviruses Ad-ChREBP-α, and gene expression was analyzed at mRNA and protein levels by real-time PCR and Western blotting analsysis. The expression levels of ChREBP target gene LPK were measured at mRNA level by real-time PCR, and the fatty acid synthesis rate was determined by \[14C\]-acetate incorporation. Results We successfully constructed recombinant adenoviruses expressing mouse ChREBP-α. Adenovirus-mediated overexpression of ChREBP-α markedly increased LPK mRNA expression and fatty acid synthesis in primary hepatocytes. Conclusion We have successfully constructed recombinant adenoviruses expressing mouse ChREBP-α, which is biologically active and can overexpress ChREBP-α in primary hepatocytes. Overexpression of ChREBP-α can enhance lipid synthesis.

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  • 收稿日期:2012-11-12
  • 最后修改日期:2012-12-26
  • 录用日期:2013-01-15
  • 在线发布日期: 2013-01-22
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