1887

Abstract

As a tool for the identification and/or purification of hepatitis C virus (HCV)-infected cells, a chimeric form of the Gal4VP16 transcription factor was engineered to be activated only in the presence of the HCV NS3/4A protease and to induce different reporter genes [choramphenical acetyltransferase (CAT), green fluorescent protein (GFP) and the cell-surface marker H-2K] through the (Gal4)-E1b promoter. For this, the NS5A/5B -cleavage motif of HCV of genotype 1a was inserted between Gal4VP16 and the N terminus of the endoplasmic reticulum (ER)-resident protein PERK, and it was demonstrated that it could be cleaved specifically by NS3/4A. Accordingly, transient transfection in tetracycline-inducible UHCV-11 cells expressing the HCV polyprotein of genotype 1a revealed the migration of the Gal4VP16 moiety of the chimera from the ER to the nucleus upon HCV expression. Activation of the chimera provoked specific gene induction, as shown by CAT assay, first in UHCV-11 cells and then in Huh-7 cells expressing an HCV replicon of genotype 1b (Huh-7 Rep). In addition, the GFP reporter gene allowed rapid fluorescence monitoring of HCV expression in the Huh-7 Rep cells. Finally, the chimera was introduced into Huh-7.5 cells infected with cell culture-generated HCV JFH1 (genotype 2a), allowing the purification of the HCV-infected cells by immunomagnetic cell sorting using H-2K as gene reporter. In conclusion, the Gal4VP16 chimera activation system can be used for the rapid identification and purification of HCV-infected cells.

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2006-12-01
2019-11-19
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