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- W1978337162 abstract "Hepatitis C virus (HCV) replicates preferentially in the liver, and in most cases the HCV infection becomes chronic and often results in hepatocellular carcinoma. When the HCV plus-strand RNA genome has been delivered to the cytosol of the infected cell, its translation is directed by the Internal Ribosome Entry Site (IRES) in the 5'-untranslated region (5'-UTR) of the viral RNA. Thereby, IRES activity is modulated by several host factors. In particular, the liver-specific microRNA-122 (miR-122) interacts with two target sites in the HCV 5'-UTR and stimulates HCV translation, thereby most likely contributing to HCV liver tropism. Here we show that HCV IRES-dependent translation efficiency in the hepatoma cell line Huh7 is highest during the G₀ and G₁ phases of the cell cycle but significantly drops during the S phase and even more in the G₂/M phase. The superimposed stimulation of HCV translation by ectopic miR-122 works best during the G₀, G₁ and G₂/M phases but is lower during the S phase. However, the levels of Ago2 protein do not substantially change during cell cycle phases, indicating that other cellular factors involved in HCV translation stimulation by miR-122 may be differentially expressed in different cell cycle phases. Moreover, the levels of endogenously expressed miR-122 in Huh7 cells are lowest in the S phase, indicating that the predominant G₀/G₁ state of non-dividing hepatocytes in the liver facilitates high expression of the HCV genome and stimulation by miR-122, with yet unknown factors involved in the differential extent of stimulation by miR-122." @default.
- W1978337162 created "2016-06-24" @default.
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- W1978337162 date "2012-01-15" @default.
- W1978337162 modified "2023-10-14" @default.
- W1978337162 title "Differential stimulation of hepatitis C virus RNA translation by microRNA-122 in different cell cycle phases" @default.
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- W1978337162 doi "https://doi.org/10.4161/cc.11.2.18699" @default.
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