Br J Cancer:SLC38A4调控Wnt/β-catenin/MYC/HMGCS2信号通路抑制肝细胞癌的发生发展

2021-07-24 xiaozeng MedSci原创

肝癌作为全球第六大常见癌症,也是全球癌症相关死亡的第三大原因。

肝癌作为全球第六大常见癌症,也是全球癌症相关死亡的第三大原因。在所有恶性肿瘤中,肝癌的预后相对较差,患者的5年生存率<20%。肝细胞癌(HCC)是肝癌的主要组织学亚型。目前急需进一步的研究驱动HCC发生发展的关键分子机制。

越来越多的证据显示,HCC与胚胎肝脏发育具有许多共同的分子特征。这些共同的分子事件被视为癌胚分子事件,例如胎儿肝脏和HCC中甲胎蛋白(AFP)的高表达。此外,一些具有更强胚胎基因表达特征的HCC的预后更差。


因此,进一步揭示胎儿肝脏发育和HCC期间的关键癌胚事件将为HCC发生和治疗靶点的研究提供新的见解。

在该研究中,研究人员通过qRT-PCR、蛋白质印迹、TCGA和GEO数据集研究了SLC38A4和HMGCS2的表达水平和临床相关性,并通过功能测定研究了SLC38A4的生物学作用。


研究人员将SLC38A4的沉默确定为癌胚分子事件。DNA高甲基化会导致胎儿肝脏和HCC中Slc38a4/SLC38A4的表达下调。研究人员发现,SLC38A4的低表达与HCC患者的不良预后相关。

相比于成人,胎儿肝脏中Slc38a4的表达下调

功能研究显示,敲除SLC38A4能够促进HCC细胞的增殖、干细胞特性和迁移能力,抑制体外HCC细胞的凋亡,并进一步抑制体内HCC肿瘤的发生。


HMGCS2被鉴定为SLC38A4的关键下游靶标。SLC38A4可通过上调AXIN1的表达以及抑制Wnt/β-catenin/MYC信号通路来提高HMGCS2的表达水平。功能性拯救(rescue)试验显示,过表达HMGCS2能够逆转SLC38A4敲除在HCC中的致癌作用。

在HCC组织中SLC38A4的表达下调且与患者的预后呈负相关

总而言之,该研究结果显示,SLC38A4的表达下调被认为是一种新的癌胚事件,SLC38A4也被鉴定为HCC发生发展过程中的一种新型肿瘤抑制因子。


原始出处:

Li, J., Li, Mh., Wang, Tt. et al. SLC38A4 functions as a tumour suppressor in hepatocellular carcinoma through modulating Wnt/β-catenin/MYC/HMGCS2 axis. Br J Cancer (17 July 2021).

 

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    2021-12-08 xjy02
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    2021-07-25 guihongzh
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    2021-07-25 zhwj

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