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Open AccessArticle

Emerging Role of l-Dopa Decarboxylase in Flaviviridae Virus Infections

Laboratory of Molecular Virology, Hellenic Pasteur Institute (HPI), 11521 Athens, Greece
Light Microscopy Unit, Hellenic Pasteur Institute, 11521 Athens, Greece
2nd Department of Internal Medicine, Medical School of Athens, Hippokration Hospital, 11521 Athens, Greece
Section of Biochemistry and Molecular Biology, Faculty of Biology, National and Kapodistrian University of Athens, 15701 Athens, Greece
Author to whom correspondence should be addressed.
Cells 2019, 8(8), 837;
Received: 27 May 2019 / Revised: 23 July 2019 / Accepted: 2 August 2019 / Published: 5 August 2019
(This article belongs to the Special Issue Recent Advances in Liver Repair Strategies)
l-dopa decarboxylase (DDC) that catalyzes the biosynthesis of bioactive amines, such as dopamine and serotonin, is expressed in the nervous system and peripheral tissues, including the liver, where its physiological role remains unknown. Recently, we reported a physical and functional interaction of DDC with the major signaling regulator phosphoinosite-3-kinase (PI3K). Here, we provide compelling evidence for the involvement of DDC in viral infections. Studying dengue (DENV) and hepatitis C (HCV) virus infection in hepatocytes and HCV replication in liver samples of infected patients, we observed a negative association between DDC and viral replication. Specifically, replication of both viruses reduced the levels of DDC mRNA and the ~120 kDa SDS-resistant DDC immunoreactive functional complex, concomitant with a PI3K-dependent accumulation of the ~50 kDa DDC monomer. Moreover, viral infection inhibited PI3K-DDC association, while DDC did not colocalize with viral replication sites. DDC overexpression suppressed DENV and HCV RNA replication, while DDC enzymatic inhibition enhanced viral replication and infectivity and affected DENV-induced cell death. Consistently, we observed an inverse correlation between DDC mRNA and HCV RNA levels in liver biopsies from chronically infected patients. These data reveal a novel relationship between DDC and Flaviviridae replication cycle and the role of PI3K in this process. View Full-Text
Keywords: hepatitis C virus; dengue virus; l-dopa decarboxylase; phosphoinosite-3-kinase (PI3K) hepatitis C virus; dengue virus; l-dopa decarboxylase; phosphoinosite-3-kinase (PI3K)
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Frakolaki, E.; Kalliampakou, K.I.; Kaimou, P.; Moraiti, M.; Kolaitis, N.; Boleti, H.; Koskinas, J.; Vassilacopoulou, D.; Vassilaki, N. Emerging Role of l-Dopa Decarboxylase in Flaviviridae Virus Infections. Cells 2019, 8, 837.

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