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Improvement of Proliferation Capacity of Non-adapted CHO Cells Subcultured Using Serum Free Media in Long-term Culture  

Lee, Seung-Sun (Dept. of Microbial Engineering, Konkuk University)
Lee, Jin-Sung (Dept. of Microbial Engineering, Konkuk University)
Byun, Soon-Hyu (Dept. of Microbial Engineering, Konkuk University)
Park, Hong-Woo (Dept. of Chemical Engineering, Hanyang University)
Choe, Tae-Boo (Dept. of Microbial Engineering, Konkuk University)
Publication Information
KSBB Journal / v.21, no.4, 2006 , pp. 248-254 More about this Journal
Abstract
Animal cell culture industry has a large market and an exponential growth rate among biological industry field. Chines hamster ovary(CHO) cells are the most widely used cell lines for recombinant protein production. They can avoid infection from polio, herpes, hepatitis B, HIV, measles, adenovirus and etc. Moreover it is easy to transfection recombinant genes and possible to suspension culture. Serum free media is one of the most important factor of protein production. Because serum has problems. Serum is not defined the contents until now, it has a number of proteins, lipids, carbohydrates and unknown molecules that cause of risk involve in infection and high cost of product purification. CHO cell line cultured using serum free media were the basis of a very successful method to produce(glyco-)protein in mammalian cells, which are then used as pharmaceutical products. Also, the low protein content of the developed medium facilitates downstream processing and product purification. But non-adapted CHO cells have a limit of proliferation cultured using serum free media and it takes very long time to adapt non-adapted cells to serum free media. There are a number of causes of a limit of proliferation using serum free media. Absence of growth factors and growth stimulating molecules is a major factor of the reasons. It makes growth signals and moves cell cycle. And increase of cellular stress is another reason. It induces increase of intraceullar ROS concentration. The purpose of this study is about improvement of proliferation capacity of non-adapted CHO cells cultured using serum free media without adaptation process.
Keywords
CHO cell; serum free media; IGF-I; ROS;
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