Overexpression of GRP78 enhances survival of CHO cells in response to serum deprivation and oxidative stress

详细信息    查看全文

• 作者：Qing Jiang ; Yuanli Sun ; Zilong Guo ; Mingpeng Fu ; Qiang Wang ; Huifen Zhu ; Ping Lei and Guanxin Shen
• 刊名：Engineering in Life Sciences
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：17
• 期：2
• 页码：107-116
• 全文大小：870K
• ISSN：1618-2863

文摘

Chinese hamster ovary (CHO) cells are regarded as one of the most commonly used mammalian hosts, which decreases the productivity due to loss in culture viability. Overexpressing antiapoptosis genes in CHO cells was developed as a means of limiting cell death upon exposure to environmental insults. Glucose-regulated protein 78 (GRP78) is traditionally regarded as a major ER chaperone that participates in protein folding and other cell processes. It is also a potent antiapoptotic protein and plays a critical role in cell survival, proliferation, and metastasis. In this study, the impact of GRP78 on CHO cells in response to environmental insults such as serum deprivation and oxidative stress was investigated. First, it was confirmed that CHO cells were very sensitive to environmental insults. Then, GRP78 overexpressing CHO cell line was established and exposed to serum deprivation and H₂O₂. Results showed that GRP78 engineering increased the viability and decreased the apoptosis of CHO cells. The survival advantage due to GRP78 engineering could be mediated by suppression of caspase-3 involved in cell death pathways in stressed cells. Besides, GRP78 engineering also enhanced yields of antibody against transferrin receptor in CHO cells. GRP78 should be a potential application in the biopharmaceutical industries.