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Previous issue date: 2011-08-31 / Financiadora de Estudos e Projetos / The expression system of recombinant proteins in insect cells/baculovirus (BEVS) was described and introduced in 1983 and since then has become a powerful tool for the production of recombinant proteins of biotechnological interest. This work studied the kinetics of Bac-to-BacR Baculovirus Expression System (Invitrogen ) used for the production of recombinant proteins, evaluating growth patterns and consumption of nutrients from Sf-9 insect cells infected with this commercial bacmid and determining the effect of viral inoculum. For this, Sf-9 cells grew at 29oC in T flasks containing 5 mL of SF-900 II medium or Schott bottles with working volume of 15 mL and orbital shaking at 90 rpm. UFLAG-286 cells were also tested at 29°C in TC-100 medium supplemented with 10% bovine fetal serum. The baculovirus used were the Autographa californica nuclear polyhedrosis virus (AcMNPV) as a wild baculovirus infection model, the bacmid extracted from DH10Bac bacteria and transposed with the transfer vector empty (pFastBac 1), called Bac sprec and the bacmid recombinant AcNPV with the GUS coding sequence of the gene β- glucuronidase, used as a standard for transposition experiments and transfection. Cells were infected at different times (TOI), on the initial phase, the exponential phase or stationary phase of cell growth, and with different multiplicities of infection (MOI) (0.01, 0.1, 1 and 10). It was observed that the MOI does not influence the viral replication, because even with the low MOI the cell growth was completely inhibited. TOI had already affected the production of total cell proteins, and infection in the early exponential phase was that obtained the highest number of total proteins. The supplementation of the cultivation with Bac sprec with serine and glutamine did not lead to increased viral production. The supernatant of cultures infected with Bac sprec was able to inhibit cell death where there was induction of apoptosis by terbutyl, indicating contain some protein with anti-apoptotic activity. This effect was not observed on wild baculovirus. / O sistema de expressao de proteinas recombinantes em celulas de inseto/baculovirus (BEVS) foi descrito e introduzido em 1983, e desde entao tornou-se uma ferramenta poderosa para a producao de proteinas recombinantes de interesse biotecnologico. O objetivo deste trabalho foi estudar os parametros cineticos do sistema Bac-to-BacR Baculovirus Expression (Invitrogen ) utilizado para a producao de proteinas recombinantes, avaliando os padroes de crescimento e consumo de nutrientes de celulas de inseto Sf-9 infectadas com este bacmideo comercial e determinando o efeito do inoculo viral. Para isso celulas Sf-9 foram cultivadas a 29oC em frascos T contendo 5 mL de meio SF-900 II, ou em frascos Schott com volume de trabalho de 15 mL e agitacao orbital a 90 rpm. Celulas UFLAG-286 tambem foram testadas a 29oC em meio TC-100 suplementado com 10% de soro fetal bovino. Os baculovirus utilizados foram o Autographa californica nuclear polyhedrosis virus (AcMNPV), como modelo de infeccao de baculovirus selvagem, o bacmideo extraido da bacteria DH10BacTM e transposto com o vetor de transferencia vazio (pFastBac 1), chamado de Bac sprec e o bacmideo recombinante AcMNPV-GUS com a sequencia codificante do gene β glucuronidase, utilizado como um padrao para experimentos de transposicao e transfeccao. As celulas foram infectadas em diferentes momentos (TOI), seja na fase inicial, na fase exponencial ou fase estacionaria do crescimento celular e com diferentes multiplicidades de infeccao (MOI) (0,01; 0,1; 1 e 10). Observou-se que o MOI nao influencia a replicacao viral, pois mesmo com baixo MOI o crescimento celular foi inibido. Ja o TOI teve influencia na producao de proteinas totais da celula, sendo que a infeccao no inicio da fase exponencial foi que obteve maior numero de proteinas totais. A suplementacao do cultivo de Bac sprec com serina e glutamina nao levou a uma maior producao viral. O sobrenadante de cultivos infectados com o Bac sprec foi capaz de inibir a morte celular onde houve inducao de apoptose por terbutil, indicando conter alguma proteina com atividade antiapoptotica. Este efeito nao foi observado com o baculovirus selvagem.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufscar.br:ufscar/6985 |
| Date | 31 August 2011 |
| Creators | Corrêa, Thaís Portantiolo |
| Contributors | Mendonça, Ronaldo Zucatelli |
| Publisher | Universidade Federal de São Carlos, Programa de Pós-graduação em Biotecnologia, UFSCar, BR |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFSCAR, instname:Universidade Federal de São Carlos, instacron:UFSCAR |
| Rights | info:eu-repo/semantics/openAccess |
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