Ferroptosis is a distinct form of regulated cell death characterized by the accumulation of lipid peroxides and iron-dependent membrane damage that is a significant contributor to drug resistance in glioblastoma(GBM)....Ferroptosis is a distinct form of regulated cell death characterized by the accumulation of lipid peroxides and iron-dependent membrane damage that is a significant contributor to drug resistance in glioblastoma(GBM).Dysregulated iron metabolism is a hallmark of cancer,making ferroptosis a unique potential target for anticancer therapy.Ferritinophagy,the selective autophagy of ferritin,plays an essential role in cellular iron homeostasis and may impact the vulnerability of cells to ferroptosis.Nuclear receptor coactivator 4(NCOA4)protein is a selective cargo receptor that plays a crucial role in ferritinophagy by targeting and delivering the ferritin iron storage protein to the lysosome for degradation,releasing iron[1].However,the underlying molecular mechanism that causes reduced NCOA4 expression in glioma is not fully understood.展开更多
三元基序家族蛋白7(tripartite motif-containing protein 7,TRIM7)作为E3泛素连接酶TRIM家族的成员,在免疫调控、代谢等生理过程中发挥重要调控作用。此外,TRIM7的异常表达与肝细胞癌(hepatocellular carcinoma,HCC)的发生发展密切相...三元基序家族蛋白7(tripartite motif-containing protein 7,TRIM7)作为E3泛素连接酶TRIM家族的成员,在免疫调控、代谢等生理过程中发挥重要调控作用。此外,TRIM7的异常表达与肝细胞癌(hepatocellular carcinoma,HCC)的发生发展密切相关并呈现出复杂的调控作用,但其在HCC中的表达调控机制尚不清楚。本研究首先利用多种在线数据库分析发现,TRIM7在HCC中高表达,并且TRIM7高表达的肝细胞癌患者预后较差;利用UCSC、JASPAR数据库分析预测TRIM7基因启动子区的转录因子结合位点。结果显示,TRIM7启动子上含有4个特异性蛋白1(specificity protein 1,SP1)转录因子结合位点。本研究利用双荧光素酶报告实验、ChIP-PCR方法检测发现,SP1通过直接结合在TRIM7启动子上的SP1结合位点,从而正调控TRIM7启动子驱动的转录活性。RT-qPCR、Western印迹检测结果进一步显示,过表达SP1在mRNA和蛋白质水平均上调TRIM7基因的表达(P<0.01),且利用SP1抑制剂Mithramycin A处理能够逆转SP1对TRIM7基因表达的调控作用(P<0.01)。总之,本研究初步揭示了TRIM7在肝细胞癌中高表达的调控机制,为深入研究该基因功能以及早期诊断、靶向治疗提供重要的理论依据。展开更多
基金The President Foundation of Nanfang Hospital,Southern Medical University,Grant/Award Number:2022A018。
文摘Ferroptosis is a distinct form of regulated cell death characterized by the accumulation of lipid peroxides and iron-dependent membrane damage that is a significant contributor to drug resistance in glioblastoma(GBM).Dysregulated iron metabolism is a hallmark of cancer,making ferroptosis a unique potential target for anticancer therapy.Ferritinophagy,the selective autophagy of ferritin,plays an essential role in cellular iron homeostasis and may impact the vulnerability of cells to ferroptosis.Nuclear receptor coactivator 4(NCOA4)protein is a selective cargo receptor that plays a crucial role in ferritinophagy by targeting and delivering the ferritin iron storage protein to the lysosome for degradation,releasing iron[1].However,the underlying molecular mechanism that causes reduced NCOA4 expression in glioma is not fully understood.
文摘三元基序家族蛋白7(tripartite motif-containing protein 7,TRIM7)作为E3泛素连接酶TRIM家族的成员,在免疫调控、代谢等生理过程中发挥重要调控作用。此外,TRIM7的异常表达与肝细胞癌(hepatocellular carcinoma,HCC)的发生发展密切相关并呈现出复杂的调控作用,但其在HCC中的表达调控机制尚不清楚。本研究首先利用多种在线数据库分析发现,TRIM7在HCC中高表达,并且TRIM7高表达的肝细胞癌患者预后较差;利用UCSC、JASPAR数据库分析预测TRIM7基因启动子区的转录因子结合位点。结果显示,TRIM7启动子上含有4个特异性蛋白1(specificity protein 1,SP1)转录因子结合位点。本研究利用双荧光素酶报告实验、ChIP-PCR方法检测发现,SP1通过直接结合在TRIM7启动子上的SP1结合位点,从而正调控TRIM7启动子驱动的转录活性。RT-qPCR、Western印迹检测结果进一步显示,过表达SP1在mRNA和蛋白质水平均上调TRIM7基因的表达(P<0.01),且利用SP1抑制剂Mithramycin A处理能够逆转SP1对TRIM7基因表达的调控作用(P<0.01)。总之,本研究初步揭示了TRIM7在肝细胞癌中高表达的调控机制,为深入研究该基因功能以及早期诊断、靶向治疗提供重要的理论依据。
