Parasitology Research

, Volume 106, Issue 6, pp 1327–1337

Specific antibodies induce apoptosis in Trypanosoma cruzi epimastigotes

  • Ana María Fernández-Presas
  • Patricia Tato
  • Ingeborg Becker
  • Sandra Solano
  • Natalia Kopitin
  • Miriam Berzunza
  • Kaethe Willms
  • Joselin Hernández
  • José Luis Molinari
Original Paper

DOI: 10.1007/s00436-010-1803-4

Cite this article as:
Fernández-Presas, A.M., Tato, P., Becker, I. et al. Parasitol Res (2010) 106: 1327. doi:10.1007/s00436-010-1803-4

Abstract

The susceptibility of Trypanosoma cruzi epimastigotes to lysis by normal or immune sera in a complement-dependent reaction has been reported. Mouse immune sera depleted complement-induced damage in epimastigotes characterized by morphological changes and death. The purpose of this work was to study the mechanism of death in epimastigotes exposed to decomplemented mouse immune serum. Epimastigotes were maintained in RPMI medium. Immune sera were prepared in mice by immunization with whole crude epimastigote extracts. Viable epimastigotes were incubated with decomplemented normal or immune sera at 37°C. By electron microscopy, agglutinated parasites showed characteristic patterns of membrane fusion between two or more parasites; this fusion also produced interdigitation of the subpellicular microtubules. Apoptosis was determined by flow cytometry using terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) and annexin V assays. Nuclear features were examined by 4′-,6-diamidino-2′-phenylindole diHCI cytochemistry that demonstrated apoptotic nuclear condensation. Caspase activity was also measured. TUNEL results showed that parasites incubated with decomplemented immune sera took up 26% of specific fluorescence as compared to 1.3% in parasites incubated with decomplemented normal sera. The Annexin-V-Fluos staining kit revealed that epimastigotes incubated with decomplemented immune sera exposed phosphatidylserine on the external leaflet of the plasma membrane. The incubation of parasites with immune sera showed caspase 3 activity. We conclude that specific antibodies are able to induce agglutination and apoptosis in epimastigotes, although the pathway is not elucidated.

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Ana María Fernández-Presas
    • 1
  • Patricia Tato
    • 1
  • Ingeborg Becker
    • 3
  • Sandra Solano
    • 1
  • Natalia Kopitin
    • 2
  • Miriam Berzunza
    • 3
  • Kaethe Willms
    • 1
  • Joselin Hernández
    • 3
  • José Luis Molinari
    • 2
  1. 1.Departamento de Microbiología y Parasitología, Facultad de MedicinaUniversidad Nacional Autónoma de MéxicoMexicoMexico
  2. 2.Departamento de Genética Molecular, Instituto de Fisiología CelularUniversidad Nacional Autónoma de MéxicoMexicoMexico
  3. 3.Departamento de Medicina Experimental, Facultad de MedicinaUniversidad Nacional Autónoma de MéxicoMexicoMexico