Investigation of optimal transduction conditions for baculovirus-mediated gene delivery into mammalian cells

Biotechnology and Bioengineering
Ching-Suei HsuYu-Chen Hu

Abstract

Although baculovirus-mediated gene delivery into mammalian cells has been documented in a wealth of the literature, systematic investigation of the optimal transduction conditions remains unavailable. In this work, a transduction protocol using unconcentrated baculovirus is proposed for simple and efficient gene delivery into HeLa cells. We found that approximately 75-85% of the cells could be readily transduced and express the reporter protein when virus transduction occurred for 4 h at 25 degrees C using Dulbecco's phosphate-buffered saline (D-PBS) as the surrounding solution. This method contrasts with previous protocols in which transduction occurs for 1 h at 37 degrees C using growth medium (e.g., DMEM) as the surrounding solution. Investigation of the physical parameters led to the findings that: 1) baculovirus uptake by HeLa cells continued for at least 4 h in the event of high virus dosage, which led to higher gene expression; 2) the half-life of baculovirus dramatically decreased at 37 degrees C; 3) EGTA pretreatment did not apparently facilitate the gene delivery when the cells grew to multilayers; and 4) lower transduction efficiency and gene expression were obtained when DMEM was used (in comparison with D-PBS and T...Continue Reading

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