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• W2115443995 abstract "The effects of conditioned medium (CM) and passage number on Spodoptera frugiperda Sf9 cell physiology and productivity have been studied. Low passage (LP) cells at passages 20-45 were compared to high passage (HP) cells at passages > 100. Addition of 20% CM or 10 kDa filtrated CM to LP cells promoted growth. LP cells passed a switch in growth kinetics, characterized by a shorter lag phase and a higher growth rate, after 30-40 passages. After this point, CM lost its stimulating effect on proliferation. HP cells displayed a still shorter lag phase and reached the maximum cell density 24-48 earlier than LP cells. HP cells also exhibited higher specific productivity of recombinant protein compared to LP cells, when infected with baculovirus during the initial 48 h of culture. The specific productivity of LP cells was decreased by 30-50% by addition of 20% CM or 10 kDa filtrated CM, whereas addition of CM to cells having passed the switch in growth kinetics had no negative effect on productivity. Cell cycle analysis showed that a large proportion of HP cells, >60%, was transiently arrested in G2/M after inoculation. In LP cultures this proportion was lower, 40-45%, and addition of CM decreased the arrested population further. This correlated to the cell size, the HP cells being the largest: HP cells > LP > LP + 20% CM > LP + 20% 10 kDa filtrated CM. Since the degree of synchronization in G2/M correlated to the productivity, yeastolate limitation was used to achieve 85% G2/M synchronized cells. In this culture the specific productivity was maintained during a prolonged production phase and a 69% higher volumetric yield was obtained. The results suggest that a decreasing degree of synchronization during the course of culture partly explains the cell-density-dependent drop in productivity in Sf9 cells." @default.
• W2115443995 created "2016-06-24" @default.
• W2115443995 creator A5086252746 @default.
• W2115443995 date "2005-01-01" @default.
• W2115443995 modified "2023-09-22" @default.
• W2115443995 title "Physiological Effects of Conditioned Medium and Passage Number on Spodoptera frugiperda Sf9 Serum Free Cultures" @default.
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• W2115443995 hasPublicationYear "2005" @default.
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