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Nakamura M, Uemura K, Saito-Tarashima N, Sato A, Orba Y, Sawa H, Matsuda A, Maenaka K, Minakawa N. Synthesis and anti-dengue virus activity of 5-ethynylimidazole-4-carboxamide (EICA) nucleotide prodrugs. Chem Pharm Bull (Tokyo) 2021; 70:220-225. [PMID: 34955490 DOI: 10.1248/cpb.c21-01038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We previously showed that 5-ethynyl-(1-β-D-ribofuranosyl)imidazole-4-carboxamide (1; EICAR) is a potent anti-dengue virus (DENV) compound but is cytotoxic to some cell lines, while its 4-thio derivative, 5-ethynyl-(4-thio-1-β-D-ribofuranosyl)imidazole-4-carboxamide (2; 4'-thioEICAR), has less cytotoxicity but also less anti-DENV activity. Based on the hypothesis that the lower anti-DENV activity of 2 is due to reduced susceptibility to phosphorylation by cellular kinase(s), we investigated whether a monophosphate prodrug of 2 can improve its activity. Here, we first prepared two types of prodrug of 1, which revealed that the S-acyl-2-thioethyl (SATE) prodrug had stronger anti-DENV activity than the aryloxyphosphoramidate (so-called ProTide) prodrug. Based on these findings, we next prepared the SATE prodrug of 4'-thioEICAR 18. As expected, the resulting 18 showed potent anti-DENV activity, which was comparable to that of 1; however, its cytotoxicity was also increased relative to 2. Our findings suggest that prodrugs of 4'-thioribonucleoside derivatives such as EICAR (1) represent an effective approach to developing potent biologically active compounds; however, the balance between antiviral activity and cytotoxicity remains to be addressed.
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Affiliation(s)
- Motoki Nakamura
- Graduate School of Pharmaceutical Science, Tokushima University
| | - Kentaro Uemura
- Drug Discovery and Disease Research Laboratory, Shionogi & Co., Ltd.,Division of Molecular Pathobiology, International Institute for Zoonosis Control, Hokkaido University.,Laboratory of Biomolecular Science, Faculty of Pharmaceutical Sciences, Hokkaido University
| | | | - Akihiko Sato
- Drug Discovery and Disease Research Laboratory, Shionogi & Co., Ltd.,Division of Molecular Pathobiology, International Institute for Zoonosis Control, Hokkaido University
| | - Yasuko Orba
- Division of Molecular Pathobiology, International Institute for Zoonosis Control, Hokkaido University.,International Collaboration Unit, International Institute for Zoonosis Control, Hokkaido University
| | - Hirofumi Sawa
- Division of Molecular Pathobiology, International Institute for Zoonosis Control, Hokkaido University.,International Collaboration Unit, International Institute for Zoonosis Control, Hokkaido University.,One Health Research Center, Hokkaido University
| | - Akira Matsuda
- Center for Research and Education on Drug Discovery, Faculty of Pharmaceutical Sciences, Hokkaido University
| | - Katsumi Maenaka
- Laboratory of Biomolecular Science, Faculty of Pharmaceutical Sciences, Hokkaido University.,Center for Research and Education on Drug Discovery, Faculty of Pharmaceutical Sciences, Hokkaido University.,Global Station for Biosurfaces and Drug Discovery, Hokkaido University
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Wang G, Sakthivel K, Rajappan V, Bruice TW, Tucker K, Fagan P, Brooks JL, Hurd T, Leeds JM, Cook PD. Synthesis of azole nucleoside 5'-monophosphate mimics (P1Ms) and their inhibitory properties of IMP dehydrogenases. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2004; 23:317-37. [PMID: 15043157 DOI: 10.1081/ncn-120027838] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
IMPDH inhibitors have potential antimicrobial, anticancer and immunomodulatory effects. Nucleoside inhibitors of IMPDH exert their inhibitory effects via nucleoside 5'-MPs. Conversion of nucleoside analogs to NMPs by cellular nucleoside kinases is not assured, and usually is inefficient. In order to bypass cellular phosphorylation, a series of azole nucleoside 5'-MP mimics (P1Ms) based on ribavirin, EICAR and bredinin were synthesized and screened against human and C. albicans IMP dehydrogenises. P1Ms 8, 16, 25, 28 and 29 demonstrated substantial IMPDH inhibition with Ki values in low micromolar range.
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