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Schistosoma mansoni: acquired immunity in mice after the use of oxamniquine at the evolutive skin and pulmonary phases

Schistosoma mansoni: imunidade adquirida em camundongos, após o uso de oxamniquina durante as fases evolutivas da pele e do pulmão

Abstracts

Mice infected with 350 cercariae of Schistosoma mansoni (LE strain) were treated with oxamniquine, at the dose of 400 mg/kg, 24, 48, 72, and 96 h after infection. Forty days after the treatment, the animals were submitted to a challenge infection with 80 cercariae, through the abdominal and ear skins. The number of immature worms in the animal groups treated 24 and 96 h after the first infection was found to be lower than that in the control group, thus showing that the death of schisto-somes by chemotherapy, at the skin and pulmonary phases, causes an acquired resistance state.

Schistosoma mansoni; Acquired immunity; Oxamniquine


Camundongos infectados com 350 cercárias de Schistosoma mansoni (cepa LE) foram tratados com oxamniquina, em dose única de 400 mg/kg, 24,48,72 e 96 horas após a infecção. Quarenta dias após o tratamento, os animais foram submetidos a uma infecção desafio com 80 cercárias, através da pele abdominal e da orelha. O número de vermes imaturos nos grupos de animais tratados 24 e 96 horas após a primeira infecção foi menor do que o do grupo controle, evidenciando que a morte de esquistossômulos por quimioterapia, durante as fases da pele e do pulmão, causa um estado de resistência adquirida.


IMMUNOLOGY

Schistosoma mansoni: acquired immunity in mice after the use of oxamniquine at the evolutive skin and pulmonary phases

Schistosoma mansoni: imunidade adquirida em camundongos, após o uso de oxamniquina durante as fases evolutivas da pele e do pulmão

Paulo Marcos Z. CoelhoI; Rômulo T. MelloII; Sílvia E. GerkenII

IDepartamento de Parasitologia, Instituto de Ciências Biológicas da Universidade Federal de Minas Gerais (ICB/UFMG). Belo Horizonte, Minas Gerais, Brasil

IIDepartamento de Análises Clínicas e Toxicológicas, Faculdade de Farmácia da Universidade Federal de Minas Gerais. Belo Horizonte, Minas Gerais, Brasil

Address for correspondence Address for correspondence: Prof. Paulo Marcos Z. Coelho Deptº Parasitología, ICB/UFMG Caixa Postal 2486 30161 Belo Horizonte, MG, Brasil

SUMMARY

Mice infected with 350 cercariae of Schistosoma mansoni (LE strain) were treated with oxamniquine, at the dose of 400 mg/kg, 24, 48, 72, and 96 h after infection. Forty days after the treatment, the animals were submitted to a challenge infection with 80 cercariae, through the abdominal and ear skins. The number of immature worms in the animal groups treated 24 and 96 h after the first infection was found to be lower than that in the control group, thus showing that the death of schisto-somes by chemotherapy, at the skin and pulmonary phases, causes an acquired resistance state.

Key words: Schistosoma mansoni; Acquired immunity; Oxamniquine.

RESUMO

Camundongos infectados com 350 cercárias de Schistosoma mansoni (cepa LE) foram tratados com oxamniquina, em dose única de 400 mg/kg, 24,48,72 e 96 horas após a infecção. Quarenta dias após o tratamento, os animais foram submetidos a uma infecção desafio com 80 cercárias, através da pele abdominal e da orelha. O número de vermes imaturos nos grupos de animais tratados 24 e 96 horas após a primeira infecção foi menor do que o do grupo controle, evidenciando que a morte de esquistossômulos por quimioterapia, durante as fases da pele e do pulmão, causa um estado de resistência adquirida.

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ACKNOWLEDGMENTS

We would like to thank Mrs. Vera de Paula Ribeiro for translating the manuscript; Mr. Alberto G. dos Santos, Mrs. Alice Neni Faria, Mr. José de Souza Filho and Miss Zenir de Souza for excellent technical assistance.

Recebido para publicação em 11/6/1990.

Aceito para publicação em 16/10/1990.

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  • Address for correspondence:

    Prof. Paulo Marcos Z. Coelho
    Deptº Parasitología, ICB/UFMG
    Caixa Postal 2486
    30161 Belo Horizonte, MG, Brasil
  • Publication Dates

    • Publication in this collection
      12 Sept 2006
    • Date of issue
      Feb 1991

    History

    • Accepted
      16 Oct 1990
    • Received
      11 June 1990
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