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Abstract
AbstractA suspended cell line from Trichoplusia ni embryos was established, and its susceptibility to Autographa californica multiple nuclear polyhedrosis virus (AcMNPV) infection was investigated. This cell line had characteristics distinct from the BTI‐Tn5Bl‐4 cell line (Tn5Bl‐4) from T. ni in growth, and showed approximately the same responses to AcMNPV infection, production of occlusion bodies, and levels of recombinant protein expression. No clumps were observed at maximum cell density at late‐log phase in shake‐flask or T‐flask cultures, and thus the cells represent a useful new contribution for baculovirus research. The cells consist of two major morphological types: approximately 70% spindle‐shaped cells and 30% round cells. The cell line was highly susceptible to virus infection and produced around 107 AcMNPV occlusion bodies per cell, on average. Production of β‐galactosidase and secreted alkaline phosphatase was high with 3.97 ± 0.13 × 104IU/mL and 3.48 ± 0.40 IU/mL, respectively. This cell line may be applicable for studies of scale‐up production of viruses or baculovirus‐insect cell expression. We also believe the new line can be a source for cell clones with higher production of virus and recombinant proteins compared to the parent or other existing cell lines such as Tn5Bl‐4.
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