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p28^GANK inhibits endoplasmic reticulum stress-induced cell death via enhancement of the endoplasmic reticulum adaptive capacity 被引量:14
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作者 Rong-Yang Dai Yao Chen +8 位作者 Jing Fu Li-Wei Dong Yi-Bin Ren Guang-Zhen Yang You-Wen Qian Jie Cao Shan-Hua Tang Sheng-Li Yang Hong-Yang Wang 《Cell Research》 SCIE CAS CSCD 2009年第11期1243-1257,共15页
It has been shown that oncoprotein p28GANK, which is consistently overexpressed in human hepatocellular carcinoma (HCC), plays a critical role in tumorigenesis of HCC. However, the underlying mechanism remains uncle... It has been shown that oncoprotein p28GANK, which is consistently overexpressed in human hepatocellular carcinoma (HCC), plays a critical role in tumorigenesis of HCC. However, the underlying mechanism remains unclear. Here, we demonstrated that p28GANK inhibits apoptosis in HCC cells induced by the endoplasmic reticulum (ER) stress. During ER stress, p28GANK enhances the unfolded protein response, promotes ER recovery from translational repression, and thereby facilitates cell's ability to cope with the stress conditions. Furthermore, p28GANK upregulates glucose-regulated protein 78 (GRP78), a key ER chaperone protein, which subsequently enhances the ER folding capacity and promotes recovery from ER stress. We also demonstrated that p28GANK increases p38 mitogen-activated protein kinase and Akt phosphorylation, and inhibits nuclear factor kappa B (NF-κB) activation under ER stress, which in turn contributes to GRP78 upregulation. Taken together, our results indicate that p28GANK inhibits ER stress-induced apoptosis in HCC cells, at least in part, by enhancing the adaptive response and GRP78 expression. We propose that p28GANK has potential implications for HCC progression under the ER stress conditions. 展开更多
关键词 p28GANK ER stress UPR GRP78 APOPTOSIS
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Herpud1对后肾间充质细胞的作用及其机制的探讨
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作者 李依蔓 周钦 《中国生物工程杂志》 CAS CSCD 北大核心 2018年第3期9-15,共7页
为初步探讨Herpud1在肾脏发育中的生物学作用,过表达Herpud1载体及敲低Herpud1载体被构建。载体被转染进后肾间充质细胞,通过RT-PCR和蛋白质免疫印迹检测了上皮间质的转换过程(EMT)的标志蛋白E-钙黏蛋白(E-cadherin)、波形蛋白(Vim... 为初步探讨Herpud1在肾脏发育中的生物学作用,过表达Herpud1载体及敲低Herpud1载体被构建。载体被转染进后肾间充质细胞,通过RT-PCR和蛋白质免疫印迹检测了上皮间质的转换过程(EMT)的标志蛋白E-钙黏蛋白(E-cadherin)、波形蛋白(Vimentin)、Snail蛋白及内质网应力的标志蛋白葡萄糖调节蛋白78(GRP78)、真核起始因子2α(e IF2α)的表达变化,通过EDU细胞增殖实验检测了Herpud1对细胞增殖的作用,同时利用细胞划痕实验验证了细胞的迁移能力。结果显示,与空白对照组相比,在Herpud1过表达的实验组中,E-cadherin的表达在mRNA和蛋白质水平均是降低的,而Snail和Vimentin的表达则是上升的,并伴随着细胞增殖活性的降低和细胞迁移能力增加,同时内质网应力相关蛋白GRP78和e IF2α是升高的。在Herpud1敲低的实验组,E-cadherin的表达在mRNA和蛋白质水平均是升高的,而Snail和Vimentin的表达下降,细胞迁移能力是降低并且细胞增殖活性升高,同时内质网应力相关蛋白GRP78和e IF2α也是降低的。这些结果证明Herpud1可以促进MK3细胞EMT过程,提高细胞的迁移能力,抑制细胞的增殖活性,其机制可能与细胞的内质网应力相关。 展开更多
关键词 Herpud1 EMT 细胞增殖 内质网应力 细胞迁移
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