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. 1991 Jul;35(7):1430–1433. doi: 10.1128/aac.35.7.1430

Synergistic inhibition of human immunodeficiency virus type 1 replication by 5-ethyl-1-ethoxymethyl-6-(phenylthio)uracil (E-EPU) and azidothymidine in vitro.

M Baba 1, M Ito 1, S Shigeta 1, H Tanaka 1, T Miyasaka 1, M Ubasawa 1, K Umezu 1, R T Walker 1, E De Clercq 1
PMCID: PMC245184  PMID: 1929304

Abstract

A novel 6-substituted acyclouridine derivative, 5-ethyl-1-ethoxymethyl-6-(phenylthio)uracil (E-EPU), has recently proved to be a highly potent and selective inhibitor of human immunodeficiency virus type 1 (HIV-1) in vitro. Combinations of 3'-azido-2',3'-dideoxythymidine (AZT) and E-EPU synergistically inhibit the replication of HIV-1 in MT-4 cells, whereas the cytotoxic effects of AZT and E-EPU on mock-infected MT-4 cells are not enhanced by the drug combination. Synergistic inhibition of HIV-1 replication has also been observed in peripheral blood lymphocytes. These results indicate that the combination of AZT and E-EPU should be further pursued in the treatment of AIDS.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Baba M., De Clercq E., Iida S., Tanaka H., Nitta I., Ubasawa M., Takashima H., Sekiya K., Umezu K., Nakashima H. Anti-human immunodeficiency virus type 1 activities and pharmacokinetics of novel 6-substituted acyclouridine derivatives. Antimicrob Agents Chemother. 1990 Dec;34(12):2358–2363. doi: 10.1128/aac.34.12.2358. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Baba M., De Clercq E., Tanaka H., Ubasawa M., Takashima H., Sekiya K., Nitta I., Umezu K., Nakashima H., Mori S. Potent and selective inhibition of human immunodeficiency virus type 1 (HIV-1) by 5-ethyl-6-phenylthiouracil derivatives through their interaction with the HIV-1 reverse transcriptase. Proc Natl Acad Sci U S A. 1991 Mar 15;88(6):2356–2360. doi: 10.1073/pnas.88.6.2356. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Baba M., Pauwels R., Balzarini J., Herdewijn P., De Clercq E., Desmyter J. Ribavirin antagonizes inhibitory effects of pyrimidine 2',3'-dideoxynucleosides but enhances inhibitory effects of purine 2',3'-dideoxynucleosides on replication of human immunodeficiency virus in vitro. Antimicrob Agents Chemother. 1987 Oct;31(10):1613–1617. doi: 10.1128/aac.31.10.1613. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Baba M., Tanaka H., De Clercq E., Pauwels R., Balzarini J., Schols D., Nakashima H., Perno C. F., Walker R. T., Miyasaka T. Highly specific inhibition of human immunodeficiency virus type 1 by a novel 6-substituted acyclouridine derivative. Biochem Biophys Res Commun. 1989 Dec 29;165(3):1375–1381. doi: 10.1016/0006-291x(89)92756-3. [DOI] [PubMed] [Google Scholar]
  5. Chou T. C., Talalay P. Quantitative analysis of dose-effect relationships: the combined effects of multiple drugs or enzyme inhibitors. Adv Enzyme Regul. 1984;22:27–55. doi: 10.1016/0065-2571(84)90007-4. [DOI] [PubMed] [Google Scholar]
  6. De Clercq E. New acquisitions in the development of anti-HIV agents. Antiviral Res. 1989 Aug;12(1):1–19. doi: 10.1016/0166-3542(89)90064-8. [DOI] [PubMed] [Google Scholar]
  7. Fischl M. A., Richman D. D., Grieco M. H., Gottlieb M. S., Volberding P. A., Laskin O. L., Leedom J. M., Groopman J. E., Mildvan D., Schooley R. T. The efficacy of azidothymidine (AZT) in the treatment of patients with AIDS and AIDS-related complex. A double-blind, placebo-controlled trial. N Engl J Med. 1987 Jul 23;317(4):185–191. doi: 10.1056/NEJM198707233170401. [DOI] [PubMed] [Google Scholar]
  8. Fischl M. A., Richman D. D., Hansen N., Collier A. C., Carey J. T., Para M. F., Hardy W. D., Dolin R., Powderly W. G., Allan J. D. The safety and efficacy of zidovudine (AZT) in the treatment of subjects with mildly symptomatic human immunodeficiency virus type 1 (HIV) infection. A double-blind, placebo-controlled trial. The AIDS Clinical Trials Group. Ann Intern Med. 1990 May 15;112(10):727–737. doi: 10.7326/0003-4819-112-10-727. [DOI] [PubMed] [Google Scholar]
  9. Hammer S. M., Gillis J. M. Synergistic activity of granulocyte-macrophage colony-stimulating factor and 3'-azido-3'-deoxythymidine against human immunodeficiency virus in vitro. Antimicrob Agents Chemother. 1987 Jul;31(7):1046–1050. doi: 10.1128/aac.31.7.1046. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Hartshorn K. L., Vogt M. W., Chou T. C., Blumberg R. S., Byington R., Schooley R. T., Hirsch M. S. Synergistic inhibition of human immunodeficiency virus in vitro by azidothymidine and recombinant alpha A interferon. Antimicrob Agents Chemother. 1987 Feb;31(2):168–172. doi: 10.1128/aac.31.2.168. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Hayashi S., Fine R. L., Chou T. C., Currens M. J., Broder S., Mitsuya H. In vitro inhibition of the infectivity and replication of human immunodeficiency virus type 1 by combination of antiretroviral 2',3'-dideoxynucleosides and virus-binding inhibitors. Antimicrob Agents Chemother. 1990 Jan;34(1):82–88. doi: 10.1128/aac.34.1.82. [DOI] [PMC free article] [PubMed] [Google Scholar]
  12. Johnson V. A., Barlow M. A., Chou T. C., Fisher R. A., Walker B. D., Hirsch M. S., Schooley R. T. Synergistic inhibition of human immunodeficiency virus type 1 (HIV-1) replication in vitro by recombinant soluble CD4 and 3'-azido-3'-deoxythymidine. J Infect Dis. 1989 May;159(5):837–844. doi: 10.1093/infdis/159.5.837. [DOI] [PubMed] [Google Scholar]
  13. Land S., Terloar G., McPhee D., Birch C., Doherty R., Cooper D., Gust I. Decreased in vitro susceptibility to zidovudine of HIV isolates obtained from patients with AIDS. J Infect Dis. 1990 Feb;161(2):326–329. doi: 10.1093/infdis/161.2.326. [DOI] [PubMed] [Google Scholar]
  14. Larder B. A., Darby G., Richman D. D. HIV with reduced sensitivity to zidovudine (AZT) isolated during prolonged therapy. Science. 1989 Mar 31;243(4899):1731–1734. doi: 10.1126/science.2467383. [DOI] [PubMed] [Google Scholar]
  15. Mitsuya H., Weinhold K. J., Furman P. A., St Clair M. H., Lehrman S. N., Gallo R. C., Bolognesi D., Barry D. W., Broder S. 3'-Azido-3'-deoxythymidine (BW A509U): an antiviral agent that inhibits the infectivity and cytopathic effect of human T-lymphotropic virus type III/lymphadenopathy-associated virus in vitro. Proc Natl Acad Sci U S A. 1985 Oct;82(20):7096–7100. doi: 10.1073/pnas.82.20.7096. [DOI] [PMC free article] [PubMed] [Google Scholar]
  16. Mitsuya H., Yarchoan R., Broder S. Molecular targets for AIDS therapy. Science. 1990 Sep 28;249(4976):1533–1544. doi: 10.1126/science.1699273. [DOI] [PubMed] [Google Scholar]
  17. Miyasaka T., Tanaka H., Baba M., Hayakawa H., Walker R. T., Balzarini J., De Clercq E. A novel lead for specific anti-HIV-1 agents: 1-[(2-hydroxyethoxy)methyl]-6-(phenylthio)thymine. J Med Chem. 1989 Dec;32(12):2507–2509. doi: 10.1021/jm00132a002. [DOI] [PubMed] [Google Scholar]
  18. Pauwels R., Balzarini J., Baba M., Snoeck R., Schols D., Herdewijn P., Desmyter J., De Clercq E. Rapid and automated tetrazolium-based colorimetric assay for the detection of anti-HIV compounds. J Virol Methods. 1988 Aug;20(4):309–321. doi: 10.1016/0166-0934(88)90134-6. [DOI] [PubMed] [Google Scholar]
  19. Richman D. D., Fischl M. A., Grieco M. H., Gottlieb M. S., Volberding P. A., Laskin O. L., Leedom J. M., Groopman J. E., Mildvan D., Hirsch M. S. The toxicity of azidothymidine (AZT) in the treatment of patients with AIDS and AIDS-related complex. A double-blind, placebo-controlled trial. N Engl J Med. 1987 Jul 23;317(4):192–197. doi: 10.1056/NEJM198707233170402. [DOI] [PubMed] [Google Scholar]
  20. Smith M. S., Brian E. L., De Clercq E., Pagano J. S. Susceptibility of human immunodeficiency virus type 1 replication in vitro to acyclic adenosine analogs and synergy of the analogs with 3'-azido-3'-deoxythymidine. Antimicrob Agents Chemother. 1989 Sep;33(9):1482–1486. doi: 10.1128/aac.33.9.1482. [DOI] [PMC free article] [PubMed] [Google Scholar]
  21. Tanaka H., Baba M., Hayakawa H., Sakamaki T., Miyasaka T., Ubasawa M., Takashima H., Sekiya K., Nitta I., Shigeta S. A new class of HIV-1-specific 6-substituted acyclouridine derivatives: synthesis and anti-HIV-1 activity of 5- or 6-substituted analogues of 1-[(2-hydroxyethoxy)methyl]-6-(phenylthio)thymine (HEPT). J Med Chem. 1991 Jan;34(1):349–357. doi: 10.1021/jm00105a055. [DOI] [PubMed] [Google Scholar]
  22. Tanaka H., Baba M., Saito S., Miyasaka T., Takashima H., Sekiya K., Ubasawa M., Nitta I., Walker R. T., Nakashima H. Specific anti-HIV-1 "acyclonucleosides" which cannot be phosphorylated: synthesis of some deoxy analogues of 1-[(2-hydroxyethoxy)methyl]-6-(phenylthio)thymine. J Med Chem. 1991 Apr;34(4):1508–1511. doi: 10.1021/jm00108a041. [DOI] [PubMed] [Google Scholar]
  23. Tanaka H., Baba M., Ubasawa M., Takashima H., Sekiya K., Nitta I., Shigeta S., Walker R. T., De Clercq E., Miyasaka T. Synthesis and anti-HIV activity of 2-, 3-, and 4-substituted analogues of 1-[(2-hydroxyethoxy)methyl]-6-(phenylthio)thymine (HEPT). J Med Chem. 1991 Apr;34(4):1394–1399. doi: 10.1021/jm00108a023. [DOI] [PubMed] [Google Scholar]
  24. Ueno R., Kuno S. Dextran sulphate, a potent anti-HIV agent in vitro having synergism with zidovudine. Lancet. 1987 Jun 13;1(8546):1379–1379. doi: 10.1016/s0140-6736(87)90681-7. [DOI] [PubMed] [Google Scholar]
  25. Vogt M. W., Hartshorn K. L., Furman P. A., Chou T. C., Fyfe J. A., Coleman L. A., Crumpacker C., Schooley R. T., Hirsch M. S. Ribavirin antagonizes the effect of azidothymidine on HIV replication. Science. 1987 Mar 13;235(4794):1376–1379. doi: 10.1126/science.2435003. [DOI] [PubMed] [Google Scholar]

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