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• W2094844328 abstract "Two insect cell lines that had been maintained in both serum-free (SFM) and serum-containing (SCM) media for over 5 years were each tested for their ability to replicate baculovirus. The gypsy moth cell line, IPLB-LdEIta (Ld), produced similar (not statistically different) amounts of gypsy moth nucleopolyhedrovirus (LdMNPV) occlusion bodies (OBs) in the two media (serum-free Ex-Cell 400 and TC-100 with 9% (v/v) fetal bovine serum, SCM(1)) but produced more of the Autographa californica nucleopolyhedrovirus (AcMNPV) OBs in SFM than in SCM(1). When Ld cells normally grown in SCM(1) were switched to SFM, production of OBs from both viruses improved and, after three passages, reached higher levels of AcMNPV production than in cells normally maintained in that medium. Alternatively, cells switched from SFM to SCM(1) initially produced as much (in the case of LdMNPV) or higher (in the case of AcMNPV) levels of virus OBs than cells normally maintained in SCM(1) but productivity dropped off over subsequent passages such that after five passages in SCM(1), cells produced substantially fewer OBs of both viruses. A fall armyworm cell line (IPLB-SF21AE; Sf) showed slightly different effects from long- and short-term passage in SFM (Ex-Cell 400) or SCM(2) (TMN-FH). Cells maintained in SFM produced about 20 times more AcMNPV OBs than cells maintained long-term in SCM. Sf cells switched from SFM to SCM maintained the level of production of that seen in SFM at the first passage, but quickly dropped off OB production levels to that normally seen in SCM. Alternatively, SCM-maintained Sf cells produced higher levels at the first passage in SFM and, within five passages in SFM, reached levels found in cells maintained for long term in this medium. Under the conditions in which these two cell lines were infected, the highest levels of AcMNPV OB production in Ld cells were about five times that of Sf cells. In a separate series of experiments, cells normally grown in SFM were passaged over five times in Ex-Cell 400 to which serum was added; both cell lines produced as much virus as that in SFM. These results suggest that it is not the serum per se but rather some other components which differ between the SFM and the SCM formulations that are responsible for the varied virus production obtained in these studies. The results of these studies suggest that a maintenance and virus production protocol can be developed with Ld cells which could improve overall efficiency of virus production. These studies also suggest that long-term maintenance of cells in SFM was not detrimental to their ability to produce baculoviruses." @default.
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• W2094844328 date "2000-10-01" @default.
• W2094844328 modified "2023-09-25" @default.
• W2094844328 title "Effects of Long- and Short-Term Passage of Insect Cells in Different Culture Media on Baculovirus Replication" @default.
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• W2094844328 doi "https://doi.org/10.1006/jipa.2000.4966" @default.
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