胰腺癌仍然是最致命的癌症之一,而且较少发现有效的治疗方案。虽然在许多肿瘤细胞,包括胰腺癌细胞中观察到泛素特异性蛋白酶14(ubiquitin specific peptidase 14,USP14)的过度表达,但它在胰腺癌中的确切作用仍未得到较好的阐明。我们研...胰腺癌仍然是最致命的癌症之一,而且较少发现有效的治疗方案。虽然在许多肿瘤细胞,包括胰腺癌细胞中观察到泛素特异性蛋白酶14(ubiquitin specific peptidase 14,USP14)的过度表达,但它在胰腺癌中的确切作用仍未得到较好的阐明。我们研究了USP14在胰腺癌中的生物学功能及其分子机制。对癌症基因组图谱数据库(The Cancer Genome Atlas,TCGA)的分析显示USP14在胰腺癌组织中高度表达,进一步探究发现,其表达水平与患者的预后呈负相关。利用shRNAUSP14慢病毒建立了稳定的USP14敲低胰腺癌细胞系,通过CCK8、克隆形成实验、划痕和Transwell试验发现,USP14敲低抑制了胰腺癌细胞的增殖和迁移能力。在胰腺癌细胞SW1990和MIAPaCa2中蛋白质印迹结果表明,下调USP14的表达导致细胞周期蛋白D3(cyclin D3)水平下降,而过表达USP14会增加细胞周期蛋白D3表达水平。此外,免疫共沉淀证明,USP14与细胞周期蛋白D3相互作用,泛素化结果显示,USP14的过表达降低了细胞周期蛋白D3的泛素化水平。并且在SW1990胰腺癌细胞中,CRISPR/Cas9介导的USP14敲除导致细胞周期蛋白D3水平下降。这些发现表明,USP14通过与细胞周期蛋白D3的相互作用促进了胰腺癌细胞的增殖和迁移能力,凸显了USP14作为胰腺癌的潜在治疗靶点。展开更多
Deubiquitinating enzymes （DUBs） play an important role in ubiquitin-dependent processes as negative regulators of protein ubiquitination. Ubiquitin-specific protease 26 （USP26） is a member of this family. The expr...Deubiquitinating enzymes （DUBs） play an important role in ubiquitin-dependent processes as negative regulators of protein ubiquitination. Ubiquitin-specific protease 26 （USP26） is a member of this family. The expression of Usp26 in mammalian testis and in other tissues has yet to be fully elucidated. To study the expression of Usp26 mRNA and protein in various murine tissues, reverse transcription （RT）-PCR and immunohistochemistry analyses were carried out. The RT-PCR analysis showed that the Usp26 transcript was expressed in all of the tested tissues. USP26 protein localization was examined by immunohistochemistry, and it was shown that USP26 was not detectable at 20 days postpartum, with the expression restricted to the cytoplasm of condensing spermatids （steps 9-16）, Leydig cells and nerve fibers in the brain. In addition, the USP26 protein was detected at moderate levels in myocardial ceils, the corpus of epidydimis, epithelium of the renal tubules and the seminal gland of postnatal day 35 mice. Its spatial and temporal expression pattern suggests that Usp26 may play an important role in development or function of the testis and brain. Further research into these possibilities is in progress.展开更多
文摘胰腺癌仍然是最致命的癌症之一,而且较少发现有效的治疗方案。虽然在许多肿瘤细胞,包括胰腺癌细胞中观察到泛素特异性蛋白酶14(ubiquitin specific peptidase 14,USP14)的过度表达,但它在胰腺癌中的确切作用仍未得到较好的阐明。我们研究了USP14在胰腺癌中的生物学功能及其分子机制。对癌症基因组图谱数据库(The Cancer Genome Atlas,TCGA)的分析显示USP14在胰腺癌组织中高度表达,进一步探究发现,其表达水平与患者的预后呈负相关。利用shRNAUSP14慢病毒建立了稳定的USP14敲低胰腺癌细胞系,通过CCK8、克隆形成实验、划痕和Transwell试验发现,USP14敲低抑制了胰腺癌细胞的增殖和迁移能力。在胰腺癌细胞SW1990和MIAPaCa2中蛋白质印迹结果表明,下调USP14的表达导致细胞周期蛋白D3(cyclin D3)水平下降,而过表达USP14会增加细胞周期蛋白D3表达水平。此外,免疫共沉淀证明,USP14与细胞周期蛋白D3相互作用,泛素化结果显示,USP14的过表达降低了细胞周期蛋白D3的泛素化水平。并且在SW1990胰腺癌细胞中,CRISPR/Cas9介导的USP14敲除导致细胞周期蛋白D3水平下降。这些发现表明,USP14通过与细胞周期蛋白D3的相互作用促进了胰腺癌细胞的增殖和迁移能力,凸显了USP14作为胰腺癌的潜在治疗靶点。
基金Acknowledgment We thank the laboratory, clinical and paramedical staff of the center of Reproductive Medicine, and the Department of Pathology for their assistance. This study was supported by the National Natural Science Foundation of China （30471735 and 30700654） and the Sci-Technical Development Project of Shanxi Province, China （2006K 15-G4）.
文摘Deubiquitinating enzymes （DUBs） play an important role in ubiquitin-dependent processes as negative regulators of protein ubiquitination. Ubiquitin-specific protease 26 （USP26） is a member of this family. The expression of Usp26 in mammalian testis and in other tissues has yet to be fully elucidated. To study the expression of Usp26 mRNA and protein in various murine tissues, reverse transcription （RT）-PCR and immunohistochemistry analyses were carried out. The RT-PCR analysis showed that the Usp26 transcript was expressed in all of the tested tissues. USP26 protein localization was examined by immunohistochemistry, and it was shown that USP26 was not detectable at 20 days postpartum, with the expression restricted to the cytoplasm of condensing spermatids （steps 9-16）, Leydig cells and nerve fibers in the brain. In addition, the USP26 protein was detected at moderate levels in myocardial ceils, the corpus of epidydimis, epithelium of the renal tubules and the seminal gland of postnatal day 35 mice. Its spatial and temporal expression pattern suggests that Usp26 may play an important role in development or function of the testis and brain. Further research into these possibilities is in progress.
