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Increased expression of phosphoenolpyruvate carboxykinase cytoplasmic isoform by hepatitis B virus X protein affects hepatitis B virus replication.

J. Med. Virol.2019 Feb;91(2):258-264. doi:10.1002/jmv.25300. Epub 2018 Oct 31
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摘要


Hepatitis B virus X protein (HBx) can stimulate the transcription of phosphoenolpyruvate carboxykinase (PEPCK), a rate-determining enzyme in gluconeogenic pathway. Two isoforms of PEPCK exist, a cytoplasmic form (PCK1) and a mitochondrial isoform (PCK2). The current study investigated the direct effect of HBx-stimulated PEPCK on hepatitis B virus (HBV) replication. We showed that PCK1 rather than PCK2 was upregulated by HBx. We also demonstrated that overexpression of PCK1 decreased HBV replication, whereas inhibition of PCK1-enhanced HBV replication. Furthermore, we found overexpression of PCK1 led to reduced expression of peroxisome proliferator-activated receptor-coactivator 1α (PGC-1α) and peroxisome proliferator-activated receptor γ (PPAR-γ), whereas knocking down PCK1 resulted in an increased expression of PGC-1α and PPAR-γ. When PPAR-γ was inhibited, knocking down PCK1 could not induce the apparent enhanced HBV replication. Our data suggested that PCK1 induced by HBx led to decreased HBV replication through the downregulation of PGC-1α and PPAR-γ. Thus, our study demonstrates a negative-feedback loop involving PCK1 and HBV may provide a balanced cell environment for HBV persistent infection.

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