Department of Thoracic Surgery, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, 121001, China.
Department of Vasculocardiology, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, 121001, China.
Arch Biochem Biophys. 2022 Oct 15;728:109352. doi: 10.1016/j.abb.2022.109352. Epub 2022 Jul 19.
Esophageal carcinoma (ESCA) is one of the most prevalent and aggressive malignancies of the gastrointestinal tract and constitutes sixth primary cause of cancer-related death worldwide. It is urgently needed to identify effective therapeutic targets. Differentially expressed genes (DEGs) involved in ESCA were identified via bioinformatics analysis. Four DEGs were selected for further analysis using Gene Expression Profiling Interactive Analysis, Human Protein Atlas, UALCAN web portal, and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis. 5-ethynyl-2'-deoxyuridine incorporation and cell counting kit-8 assays were used to evaluate cell proliferation. Western blot analysis was used to detect the protein levels of lysosomal-associated transmembrane protein 4B (LAPTM4B), Notch1, hairy and enhancer of split 1 (Hes1), and hairy and enhancer of split-related with YRPW motif 1 (Hey1). Results showed that LAPTM4B, Bcl-2 homology domain 3 (BH3)-interacting domain death agonist (BID), epithelial cell transforming sequence 2 (ECT2), and aurora kinase A (AURKA) were upregulated in several types of tumors including ESCA and correlated with tumor stage and tumor histology based on bioinformatics analysis. KEGG pathway analysis suggested that LAPTM4B-associated genes were significantly enriched in Notch pathway. Meanwhile, BID-, ECT2-, and AURKA-correlated genes were particularly enriched in p53 signaling pathway. Additionally, we found that LAPTM4B silencing inhibited cell proliferation and Notch pathway in ESCA cells. Notch1 overexpression abrogated LAPTM4B knockdown-induced proliferation reduction in ESCA cells. In conclusion, LAPTM4B silencing inhibited proliferation in ESCA cells by inactivating the Notch pathway.
食管癌(ESCA)是最常见和最具侵袭性的胃肠道恶性肿瘤之一,也是全球癌症相关死亡的第六大主要原因。因此,迫切需要确定有效的治疗靶点。通过生物信息学分析鉴定了参与 ESCA 的差异表达基因(DEGs)。使用基因表达谱交互分析、人类蛋白质图谱、UALCAN 门户网站和京都基因与基因组百科全书(KEGG)途径分析进一步选择了四个 DEGs 进行分析。使用 5-乙炔基-2'-脱氧尿苷掺入和细胞计数试剂盒-8 测定来评估细胞增殖。使用 Western blot 分析来检测溶酶体相关跨膜蛋白 4B(LAPTM4B)、Notch1、头发和增强子分裂 1(Hes1)和头发和增强子分裂相关与 YRPW 基序 1(Hey1)的蛋白水平。结果表明,LAPTM4B、Bcl-2 同源结构域 3(BH3)-相互作用结构域死亡激动剂(BID)、上皮细胞转化序列 2(ECT2)和极光激酶 A(AURKA)在包括 ESCA 在内的几种类型的肿瘤中上调,并根据生物信息学分析与肿瘤分期和肿瘤组织学相关。KEGG 途径分析表明,LAPTM4B 相关基因在 Notch 途径中显著富集。同时,BID、ECT2 和 AURKA 相关基因在 p53 信号通路中特别富集。此外,我们发现 LAPTM4B 沉默抑制 ESCA 细胞的增殖和 Notch 途径。Notch1 过表达可消除 LAPTM4B 敲低诱导的 ESCA 细胞增殖减少。总之,LAPTM4B 沉默通过失活 Notch 途径抑制 ESCA 细胞的增殖。