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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Broad-spectrum antiviral and cytocidal activity of cyclopentenylcytosine, a carbocyclic nucleoside targeted at CTP synthetase.

Cyclopentenylcytosine (Ce-Cyd) is a broad-spectrum antiviral agent active against DNA viruses [herpes (cytomegalo), pox (vaccinia)], (+)RNA viruses [picorna (polio, Coxsackie, rhino), toga (Sindbis, Semliki forest), corona], (-)RNA viruses [orthomyxo (influenza), paramyxo (parainfluenza, measles), arena (Junin, Tacaribe), rhabdo (vesicular stomatitis)] and (+/-)RNA viruses (reo). Ce-Cyd is a more potent antiviral agent than its saturated counterpart, cyclopentylcytosine (carbodine, C-Cyd). Ce-Cyd also has potent cytocidal activity against a number of tumor cell lines. The putative target enzyme for both the antiviral and antitumor action of Ce-Cyd is assumed to be the CTP synthetase that converts UTP to CTP. In keeping with this hypothesis was the finding that the antiviral and cytocidal effects of Ce-Cyd are readily reversed by Cyd and, to a lesser extent, Urd, but not by other nucleosides such as dThd or dCyd. In contrast, pyrazofurin and 6-azauridine, two nucleoside analogues that are assumed to interfere with OMP decarboxylase, another enzyme involved in the biosynthesis of pyrimidine ribonucleotides, potentiate the cytocidal activity of Ce-Cyd. Ce-Cyd should be further pursued, as such and in combination with OMP decarboxylase inhibitors, for its therapeutic potential in the treatment of both viral and neoplastic diseases.[1]


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