NAD+激酶
烟酰胺单核苷酸
烟酰胺腺嘌呤二核苷酸
生物化学
中国仓鼠卵巢细胞
烟酰胺磷酸核糖转移酶
烟酰胺
细胞内
CD38
新陈代谢
甘油-3-磷酸脱氢酶
生物
核苷
化学
酶
细胞生物学
干细胞
川地34
受体
作者
Hye‐Jin Han,Hagyeong Kim,Hong Yu,Jong Uk Park,Jaeho Bae,Jong Kwang Hong,Jong Kwang Hong,Jong Youn Baik
标识
DOI:10.1002/biot.202400311
摘要
Abstract In the previous study, the culture medium was treated with nicotinamide adenine dinucleotide (NAD + ) under the hypothesis that NAD + regeneration is a major factor causing excessive lactate accumulation in Chinese hamster ovary (CHO) cells. The NAD + treatment improved metabolism by not only reducing the Warburg effect but also enhancing oxidative phosphorylation, leading to enhanced antibody production. Building on this, four NAD + precursors – nicotinamide mononucleotide (NMN), nicotinic acid (NA), nicotinamide riboside (NR), and nicotinamide (NAM) – were tested to elevate intracellular NAD+ levels more economically. First, the ability of CHO cells to utilize both the salvage and Preiss‐Handler pathways for NAD + biosynthesis was verified, and then the effect of NAD + precursors on CHO cell cultures was evaluated. These precursors increased intracellular NAD + levels by up to 70.6% compared to the non‐treated group. Culture analysis confirmed that all the precursors induced metabolic changes and that NMN, NA, and NR improved productivity akin to NAD + treatment, with comparable integral viable cell density. Despite the positive effects such as the increase in the specific productivity and changes in cellular glucose metabolism, none of the precursors surpassed direct NAD + treatment in antibody titer, presumably due to the reduction in nucleoside availability, as evidenced by the decrease in ATP levels in the NAD + precursor‐treated groups. These results underscore the complexity of cellular metabolism as well as the necessity for further investigation to optimize NAD + precursor treatment strategies, potentially with the supplementation of nucleoside precursors. Our findings suggest a feasible approach for improving CHO cell culture performances by using NAD + precursors as medium and feed components for the biopharmaceutical production.
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