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Rotavirus virus-like particle (VLP) composed of VP2,VP6, and VP7 was expressed in the Baculovirus ExpressionVector System (BEVS). Sf9 cell, a host of the baculovirus,was cultured from a 0.5-l spinner flask to the 50-l bioreactorsystem. Sf9 cell was maintained at cell density between3.0E+05 and 3.0E+06 cells/ml and grew up to 1.12E+07cells/ml in the bioreactor. Growth kinetics was comparedunder different culture systems and showed similar growthkinetics with 20.1-25.2 h of doubling time. Early exponentiallygrowing cell culture was infected with three recombinantbaculoviruses expressing VP2, VP6, and VP7 proteinat 1.0, 2.0, and 0.2 moi, respectively. The expression ofrotavirus proteins was confirmed by Western blot analysisand its three-layered virus-like structure was observed underan electron microscope. Rotavirus VLP was semipurified andimmunized in ICR mice intramuscularly. Rotavirus-specificserum antibody was detected from 2 weeks after the immunizationand lasted at least 21 weeks of the post-immunization,indicating its possible use as a vaccine candidate.

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