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Increase of Fatty Acid Oxidation and VLDL Assembly and Secretion Overexpression of PTEN in Cultured Hepatocytes of Newborn Calf

机译:新生小牛肝细胞中脂肪酸氧化和VLDL组装的增加以及PTEN的分泌过表达

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biBackground /i/bPhosphatase and tensin homolog (PTEN) is a potent tumor suppressor gene that also plays a vital role in regulating fatty acid metabolism. Here we attempted to elucidate the role of PTEN in the regulation of fatty acid oxidation and the assembly and secretion of very low density lipoprotein (VLDL) in dairy cow liver. biMethods /i/bWe transfected primary culture calf hepatocytes with adenovirus-mediated PTEN overexpression vector (AD-GFP-PTEN).PTEN-overexpressing hepatocytes and control hepatocytes were obtained. biResults /i/bCompared with controls, overexpression of PTEN significantly up-regulated CPT I, ACSL, HADH expression (ip/i0.05), which are all involved in fatty acid oxidation. At the same time, the expression of ApoB100 (ip/i&0.01), ApoE (ip/i0.05) and MTP (ip/i0.01) increased. Therefore, the assembly and secretion of VLDL was enhanced (ip/i0.05). The expression of LDLR was slightly up-regulated, but there was no significant difference (ip/i&0.05). To demonstrate that fatty acid metabolism was changed, we measured the concentrations of TG and VLDL. The concentration of TG was significantly decreased in hepatocytes (ip/i0.01), while the concentration of VLDL was significantly increased in the medium (iP/i0.05). biConclusions /i/bOverexpressing PTEN enhanced fatty acid oxidation and assembly and secretion of VLDL. PTEN gene therapy could have therapeutic potential for fatty liver diseases of dairy cattle.
机译:背景 磷酸酶和张力蛋白同源物(PTEN)是有效的抑癌基因,在调节脂肪酸代谢中也起着至关重要的作用。在这里,我们试图阐明PTEN在乳牛肝中脂肪酸氧化调节以及极低密度脂蛋白(VLDL)的组装和分泌中的作用。 方法 我们用腺病毒介导的PTEN过表达载体(AD-GFP-PTEN)转染原代培养小牛肝细胞,获得了PTEN过表达的肝细胞和对照肝细胞。 结果 与对照组相比,PTEN的过度表达显着上调了CPT I,ACSL和HADH的表达( p <0.05)在脂肪酸氧化。同时,ApoB100( p &#38; 0.01),ApoE( p <0.05)和MTP( p <0.01)增加。因此,VLDL的组装和分泌得到增强( p <0.05)。 LDLR的表达略有上调,但没有显着差异(> 0.05)。为了证明脂肪酸代谢发生了变化,我们测量了TG和VLDL的浓度。肝细胞中TG的浓度显着降低( p <0.01),而培养基中VLDL的浓度显着升高( P <0.05)。 结论 过表达的PTEN增强了脂肪酸的氧化以及VLDL的组装和分泌。 PTEN基因疗法可能对奶牛的脂肪肝具有治疗潜力。

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