Reciprocal effects of micro-RNA-122 on expression of heme oxygenase-1 and hepatitis C virus genes in human hepatocytes |
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Authors: | Shan Ying Zheng Jianyu Lambrecht Richard W Bonkovsky Herbert L |
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Affiliation: | Department of Medicine, University of Connecticut Health Center, Farmington, Connecticut, USA. ying.shan@umassmed.edu |
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Abstract: | BACKGROUND & AIMS: Heme oxygenase-1 (HO-1) is an antioxidant defense and key cytoprotective enzyme, which is repressed by Bach1. Micro-RNA-122 (miR-122) is specifically expressed and highly abundant in human liver and required for replication of hepatitis C virus (HCV) RNA. This study was to assess whether a specific miR-122 antagomir down-regulates HCV protein replication and up-regulates HO-1. METHODS: We transfected antagomir of miR-122, 2'-O-methyl-mimic miR-122, or nonspecific control antagomir, into wild-type (WT) Huh-7 cells or Huh-7 stably replicating HCV subgenomic protein core through nonstructural protein 3 of HCV (NS3) (CNS3 replicon cells) or NS3-5B (9-13 replicon cells). RESULTS: Antagomir of miR-122 reduced the abundance of HCV RNA by 64% in CNS3 and by 84% in 9-13 cells. Transfection with 2'-O-methlyl-mimic miR-122 increased HCV levels up to 2.5-fold. Antagomir of miR-122 also decreased Bach1 and increased HO-1 mRNA levels in CNS3, 9-13, and WT Huh-7 cells. Increasing HO-1 by silencing Bach1 with 50 nmol/L Bach1-short interfering RNA or by treatment with 5 mumol/L cobalt protoporphyrin or heme (known inducers of HO-1) decreased HCV RNA and protein by 50% in HCV replicon cells. CONCLUSIONS: Down-regulation of HCV replication using an antagomir targeted to miR-122 is effective, specific, and selective. Increasing HO-1, by silencing the Bach1 gene or by treatment with cobalt protoporphyrin or heme, decreases HCV replication. Thus, miR-122 plays an important role in the regulation of HCV replication and HO-1/Bach1 expression in hepatocytes. Down-regulation of miR-122 and up-regulation of HO-1 may be new strategies for anti-HCV intervention and cytoprotection. |
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Keywords: | CHC, chronic hepatitis C CNS3, HCV replicon expressing HCV subgenomic protein core through nonstructural protein 3 CoPP, cobalt protoporphyrin DGCR8, the DiGeorge syndrome critical region gene 8 GAPDH, glyceraldehyde phosphate dehydrogenase HCV, hepatitis C virus HO, heme oxygenase miRNA, micro-RNA NCR, noncoding region Nrf2, NF-E2-related factor 2 NS3, nonstructural protein 3 of HCV NS5B, nonstructural protein 5b of HCV NSCA, nonspecific control antagomir PAGE, polyacrylamide gel electrophoresis R-luc, a stable Huh-7 line that expresses Renilla luciferase SDS, sodium dodecyl sulfate UTR, untranslated region WT, wild-type |
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