Parasitology Research

, Volume 87, Issue 7, pp 513–520

Modulation induced by estradiol in the acute phase of Trypanosoma cruzi infection in mice

Authors

  • Elen M. de Souza
    • Laboratório de Biologia Celular, Departamento de Ultra-estrutura e Biologia Celular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Av. Brasil 4365, Manguinhos, 21045-900, Rio de Janeiro, RJ, Brazil
  • Maria Rivera
    • Laboratório de Biologia Celular, Departamento de Ultra-estrutura e Biologia Celular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Av. Brasil 4365, Manguinhos, 21045-900, Rio de Janeiro, RJ, Brazil
  • Tânia C. Araújo-Jorge
    • Laboratório de Biologia Celular, Departamento de Ultra-estrutura e Biologia Celular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Av. Brasil 4365, Manguinhos, 21045-900, Rio de Janeiro, RJ, Brazil
  • Solange L. de Castro
    • Laboratório de Biologia Celular, Departamento de Ultra-estrutura e Biologia Celular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Av. Brasil 4365, Manguinhos, 21045-900, Rio de Janeiro, RJ, Brazil
Original Paper

DOI: 10.1007/s004360100376

Cite this article as:
de Souza, E.M., Rivera, M., Araújo-Jorge, T.C. et al. Parasitol Res (2001) 87: 513. doi:10.1007/s004360100376

Abstract.

We investigated the effect of 17β-estradiol on mice resistant to infection by Trypanosoma cruzi. Infected Balb/C, C3H and C57BL/6 female mice had a longer survival time than males, C57BL/6 showing the highest difference (50% cumulative mortality in females versus 100% in males). This lineage was treated with estradiol (from 0.05 µg to 500 µg/mouse) 1 day before infection. Treatment with 50 µg or 500 µg estradiol/mouse increased mortality and parasitaemia. Low doses had no effect or tended to reduce both parameters. Given that estradiol presented no in vitro effect on trypomastigotes or epimastigotes, the involvement of a direct hormonal effect on the parasite is improbable. Alterations in the humoral T. cruzi-specific response were also discarded, since the kinetics and concentration of anti-T. cruzi IgG were not affected by the treatment. Females infected during an estradiol-descending phase (meta-oestrus) survived longer than those infected during other phases of the oestrous cycle. We confirmed that estradiol interferes with T. cruzi infection.

Copyright information

© Springer-Verlag 2001