Abstract
Hepatitis C virus (HCV) induces the expression of the genes of proinflammatory cytokines, the excessive production of which may cause cell death, and contribute to development of liver fibrosis and hepatocarcinoma. The relationship between cytokine production and metabolic disorders in HCV-infected cells remains obscure. The levels of biogenic polyamines, spermine, spermidine, and their precursor putrescine, may be a potential regulator of these processes. The purpose of the present work was to study the effects of the compounds which modulate biogenic polyamines metabolism on cytokine production and HCV proteins expression. Human hepatocarcinoma Huh7.5 cells have been transfected with the plasmids that encode HCV proteins and further incubated with the following low-molecular compounds that affect different stages of polyamine metabolism: (1) difluoromethylornithine (DFMO), the inhibitor of ornithine decarboxylase, the enzyme that catalyzes the biosynthesis of polyamines; (2) N,N'-bis(2,3-butane dienyl)-1,4-diaminobutane (MDL72.527), the inhibitor of proteins involved in polyamine degradation; and (3) synthetic polyamine analog N1,N11-diethylnorspermine (DENSpm), an inducer of polyamine degradation enzyme. The intracellular accumulation and secretion of cytokines (IL-6, IL-1β, TNF-α, and TGF-β) was assessed by immunocytochemistry and in the immunoenzyme assay, while the cytokine gene expression was studied using reverse transcription and PCR. The effects of the compounds under analysis on the expression of HCV proteins were analyzed using the indirect immunofluorescence with anti-HCV monoclonal antibodies. It has been demonstrated that, in cells transfected with HCV genes, DFMO reduces the production of three out of four tested cytokines, namely, TNF-α and TGF-β in cells that express HCV core, Е1Е2, NS3, NS5A, and NS5B proteins, and IL-1β in the cells that express HCV core, Е1Е2, and NS3 proteins. MDL72527 and DENSpm decreased cytokine production to a lesser extent. Incubation with DFMO led to a 28–32% decrease in the number of cells expressing NS5B or NS5A, both of which are key components of the HCV replication complex. The results obtained in the work indicate that a further detailed study of the antiviral activity of DFMO is required in order to assess its potential as an anti-hepatitis C therapeutic agent.
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Abbreviations
- APAO:
-
polyamine oxidase
- CHC:
-
chronic hepatitis C
- DENSpm:
-
N1,N11-diethylnorspermine
- DFMO:
-
difluoromethylornithine
- ELISA:
-
immunoenzyme assay
- HCV:
-
hepatitis C virus
- IL:
-
interleukin
- mAb:
-
monoclonal antibody
- MDL:
-
N,N'-bis(2,3-butane dienyl)-1,4-diaminobutane (MDL72.527)
- NS:
-
nonstructural protein
- ODC:
-
ornithine decarboxylase
- OS:
-
oxidative stress
- ROS:
-
reactive oxygen species
- SMO:
-
spermine oxidase
- SSAT:
-
spermidine/spermine N1-acetyltransferase
- TGF:
-
transforming growth factor
- TNF:
-
tumor necrosis factor
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Original Russian Text © O.V. Masalova, E.I. Lesnova, E.I. Samokhvalov, K.Yu. Permyakova, A.V. Ivanov, S.N. Kochetkov, A.A. Kushch, 2017, published in Molekulyarnaya Biologiya, 2017, Vol. 51, No. 3, pp. 512–523.
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Masalova, O.V., Lesnova, E.I., Samokhvalov, E.I. et al. Low-molecular-weight regulators of biogenic polyamine metabolism affect cytokine production and expression of hepatitis С virus proteins in Huh7.5 human hepatocarcinoma cells. Mol Biol 51, 453–464 (2017). https://doi.org/10.1134/S0026893317030128
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DOI: https://doi.org/10.1134/S0026893317030128