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Bioreactor production of human #alpha#_1-antitrypsin using metabolically regulated plant cell cultures

机译:使用代谢调节的植物细胞培养物生产人#alpha#_1-抗胰蛋白酶的生物反应器

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摘要

Transgenic rice cellcultures,capable of producing recombinant human #alpha#_1-antitrypsin (rAAT),were scaled up from shake flasks to a 5-L bioreaactor.The maximum specific growth rates (#mu#_(max) observed from two bioreactor runs were 0.40 day~(-1) (doubling time of 1.7 days) and 0.47 day~(-1) (doubling time of 1.5 days),and the maximum specific oxygen uptake rates were 0.78 and 0.84 mmol O_2/(g dw h).Using a metabolically regulated rice #alpha#-amylase (RAMY3d)promoter,signal peptide,and terminator,sugar deprivation turned on rAAT expression,and rAAT was secreted into the culture medium.After 1 day of culture in sugar-free medium,there was still continued biomass growth,oxygen consumption,and viability.Extracellular concentrations of 51 and 40 mg active rAAT/L were reached 1.7 and 2.5 days,respectively,afte rinduction in a sugar-free medium.Volumetric productivities for two batch cultures were 7.3 and 4.6 mg rAAT(L day),and specific productivities were 3.2 and 1.6 mg rAAT/(g dw day).Several different molecular weight bands of imunoreactive rAAT were observed on immunoblots.
机译:将能产生重组人#alpha#_1-抗胰蛋白酶(rAAT)的转基因水稻细胞培养物从摇瓶中放大到5 L生物反应器。两次生物反应器运行观察到的最大比生长速率(#mu #_(max))分别为0.40天〜(-1)(1.7天的倍增时间)和0.47天〜(-1)(1.5天的倍增时间),最大比氧吸收率分别为0.78和0.84 mmol O_2 /(g dw h)使用受代谢调节的水稻#α#-淀粉酶(RAMY3d)启动子,信号肽和终止子,糖剥夺打开了rAAT的表达,并且rAAT被分泌到培养基中。在无糖培养基中培养1天后,仍能继续保持生物量的增长,耗氧量和生存力。分别在无糖培养基中分别进行51和40 mg活性rAAT / L的胞外浓缩,分别在1.7和2.5天后冲洗。两次分批培养的体积生产率分别为7.3和2.5。 4.6 mg rAAT(L日),比生产率分别为3.2和1.6 mg rAAT /(g dw日)。在免疫印迹上观察到了几种不同分子量的免疫反应性rAAT。

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