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Strongyloses ratti and S. stercoralis: effects of cambendazole, thiabendazole and mebendazole in vitro

Strongyloides ratti e S. stercoralis: efeitos de cambendazol, tiabendazol e mebendazol in vitro

Abstracts

The effects of in vitro incubation of three henzimidazole anthelmintics, thiabendazole, mebendazole and cambendazole on Strongyloides were compared. No drug affected hatching of S. ratti eggs or the viability of infective larvae or parasitic adult worms, but all three inhibited moulting of S. ratti larvae. In addition, cambendazole, but not thiabendazole or mebendazole, impaired the viability of S. ratti first- and second-stage larvae. The three drugs had no effect on isolated S. stercorais free-living adult worms, but they all prevented development of S. stercoralis rhabditiform larvae. Thiabendazole and mebendazole had no effect on the infectivity of either S. ratti or S. stercoralis infective larvae, but infection with these worms was abrogated by prior incubation with cambendazole. These results indicate that cambendazole acts in a different manner to the other two drugs. Since it is active against larvae migrating through the tissues, it is potentially of much greater value than thiabendazole or mebendazole in the therapy of strongyloidiasis.

Strongyloides ratti; Strongyloides stercoralis; Action in vitro drugs; Cambendazole; Thiabendazole; Mebendazole


Os efeitos da incubação de três antihelmínticos, tiabendazol, mebendazol e cambendazol sobre Strongyloides foram comparados. Nenhuma droga afetou a eclosão dos ovos de S. ratti ou a viabilidade de larvas infectantes ou vermes adultos parasitários, mas todas as três inibiram a formação de larvas de S. ratti. Além disso, cambendazol, mas não tiabendazol ou mebendazol, diminuiu a viabilidade de larvas de primeiro e segundo estágio de S. ratti. As três drogas não tiveram efeito sobre vermes adultos de vida livre isolados, de S. stercoralis, mas todas evitaram o desenvolvimento de larvas rabditiformes de S. stercoralis. Tiabenda zol e mebendazol não tiveram efeito sobre a infectividade de larvas infectantes de S. ratti ou de S. stercoralis, mas a infecção com esses vermes foi anulada por incubação prévia com cambendazol. Esses resultados indicam que cambendazol age de modo diferente das outras duas drogas. Uma vez que ele é ativo contra lar vas migrando através dos tecidos, é potencial mente de muito maior valor que o tia bendazol ou mebendazol na terapêutica da esbrongiloidíase.


THERAPEUTIC ASSAYS

Strongyloses ratti and S. stercoralis: effects of cambendazole, thiabendazole and mebendazole in vitro

Strongyloses ratti e S. stercoralis: efeitos de cambendazol, tiabendazol e mebendazol in vitro

David I. Grove; Carolyn Northern

Department of Medicine, University of Western Australia, Queen Elizabeth It Medical Centre, Neulands, Western Australia. 6009

Correspondence Correspondence: Dr. D. I. Grove Department of Medicine University of Western Australia Queen Elizabeth II Medical Centre Nedlands, Western Australia, 6009

SUMMARY

The effects of in vitro incubation of three henzimidazole anthelmintics, thiabendazole, mebendazole and cambendazole on Strongyloides were compared. No drug affected hatching of S. ratti eggs or the viability of infective larvae or parasitic adult worms, but all three inhibited moulting of S. ratti larvae. In addition, cambendazole, but not thiabendazole or mebendazole, impaired the viability of S. ratti first- and second-stage larvae. The three drugs had no effect on isolated S. stercorais free-living adult worms, but they all prevented development of S. stercoralis rhabditiform larvae. Thiabendazole and mebendazole had no effect on the infectivity of either S. ratti or S. stercoralis infective larvae, but infection with these worms was abrogated by prior incubation with cambendazole. These results indicate that cambendazole acts in a different manner to the other two drugs. Since it is active against larvae migrating through the tissues, it is potentially of much greater value than thiabendazole or mebendazole in the therapy of strongyloidiasis.

Key words:Strongyloides ratti — Strongyloides stercoralis — Action in vitro drugs — Cambendazole — Thiabendazole — Mebendazole.

RESUMO

Os efeitos da incubação de três antihelmínticos, tiabendazol, mebendazol e cambendazol sobre Strongyloides foram comparados. Nenhuma droga afetou a eclosão dos ovos de S. ratti ou a viabilidade de larvas infectantes ou vermes adultos parasitários, mas todas as três inibiram a formação de larvas de S. ratti. Além disso, cambendazol, mas não tiabendazol ou mebendazol, diminuiu a viabilidade de larvas de primeiro e segundo estágio de S. ratti. As três drogas não tiveram efeito sobre vermes adultos de vida livre isolados, de S. stercoralis, mas todas evitaram o desenvolvimento de larvas rabditiformes de S. stercoralis. Tiabenda zol e mebendazol não tiveram efeito sobre a infectividade de larvas infectantes de S. ratti ou de S. stercoralis, mas a infecção com esses vermes foi anulada por incubação prévia com cambendazol. Esses resultados indicam que cambendazol age de modo diferente das outras duas drogas. Uma vez que ele é ativo contra lar vas migrando através dos tecidos, é potencial mente de muito maior valor que o tia bendazol ou mebendazol na terapêutica da esbrongiloidíase.

Texto completo disponível apenas em PDF.

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ACKNOWLEDGEMENT

This study was supported by a grant from the National Health and Medical Research Council of Australia.

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Recebido para publicação em 22/2/1985.

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  • Correspondence:
    Dr. D. I. Grove
    Department of Medicine
    University of Western Australia
    Queen Elizabeth II Medical Centre
    Nedlands, Western Australia, 6009
  • Publication Dates

    • Publication in this collection
      16 Oct 2012
    • Date of issue
      Apr 1986

    History

    • Received
      22 Feb 1985
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