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Regulation of XBP-1 Signaling During Transient and Stable Recombinant Protein Production in CHO Cells

机译:XBP-1信号传导在CHO细胞中稳定和稳定的重组蛋白生产过程中的调节。

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摘要

X-box binding protein 1 (XBP-1) is a key regulator of cellular unfolded protein response (UPR). The spliced isoform of XBP-1, XBP-1 S, is a transcription activator, which is expressed only when UPR is induced. However, the impact of recombinant protein production on the regulation of XBP-1 signaling in CHO cells is not well understood. In this report, we cloned the Chinese hamster XBP-1 homolog to aid the investigation of the interplay between protein productivity, culture conditions, and endogenous XBP-1 signaling in CHO cells. Interestingly, expression of XBP-1 S is detected in the non-producing and unstressed CHO-K1 cells. Transient expression of recombinant erythropoietin reveals a positive correlation between XBP-1 mRNA abundance and protein production level. However, such a correlation is not observed in batch cultivation of stable producing cell lines. The increased XBP-1 splicing is detected in late-phase cultures, suggesting that induction of XBP-1S may be a result of nutrient limitations or other environmental stresses rather than that of increased intracellular accumulation of recombinant proteins. Our data suggest that XBP-1 is a key determinant for the secretory capacity of CHO cells. Understanding its dynamic regulation hence provides a rational basis for cellular engineering strategies to improve recombinant protein secretion.
机译:X-box结合蛋白1(XBP-1)是细胞未折叠蛋白应答(UPR)的关键调节因子。 XBP-1的剪接同工型XBP-1 S是转录激活因子,仅在诱导UPR时才表达。但是,重组蛋白生产对CHO细胞中XBP-1信号调节的影响尚不清楚。在本报告中,我们克隆了中国仓鼠XBP-1同源物,以协助研究CHO细胞中蛋白质生产力,培养条件和内源性XBP-1信号之间的相互作用。有趣的是,在非产生和未应激的CHO-K1细胞中检测到XBP-1S的表达。重组促红细胞生成素的瞬时表达表明XBP-1 mRNA丰度与蛋白质生产水平呈正相关。然而,在稳定生产细胞系的分批培养中未观察到这种相关性。在后期培养物中检测到XBP-1剪接增加,这表明XBP-1S的诱导可能是营养限制或其他环境胁迫的结果,而不是重组蛋白在细胞内积累的结果。我们的数据表明XBP-1是CHO细胞分泌能力的关键决定因素。因此,了解其动态调节为改善重组蛋白分泌的细胞工程策略提供了合理的基础。

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