IgG isotype profile is correlated with cardiomegaly in Beagle dogs infected with distinct Trypanosoma cruzi strains

• Published in: Veterinary immunology and immunopathology Vol. 124; no. 1; pp. 163 - 168
• Main Authors: Guedes, Paulo M.M., Veloso, Vanja M., Gollob, Kenneth J., Afonso, Luis C.C., Caldas, Ivo S., Vianna, Priscila, de Lana, Marta, Chiari, Egler, Bahia, Maria T., Galvão, Lúcia M.C.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 15-07-2008; Amsterdam: Elsevier
• Subjects: acute course; Animals; Antibodies, Protozoan - blood; Beagle; Beagle dogs; cardiomegaly; Cardiomegaly - immunology; Cardiomegaly - parasitology; cardiovascular diseases; Cell Growth Processes - immunology; cell proliferation; cell-mediated immunity; Chagas disease; Chagas Disease - immunology; Chagas Disease - parasitology; Chagas Disease - veterinary; chronic diseases; dog diseases; Dog Diseases - immunology; Dog Diseases - parasitology; Dogs; Enzyme-Linked Immunosorbent Assay - veterinary; Flow Cytometry - veterinary; humoral immunity; IgG isotype; immune response; immunoglobulin G; Immunoglobulin G - blood; Immunoglobulin G - immunology; Immunopathogenesis; isotypes; Kinetics; Leukocytes, Mononuclear - immunology; longitudinal studies; monocytes; Organ Size; pathogenicity; Regression Analysis; strain differences; Trypanosoma cruzi; Trypanosoma cruzi - immunology; Chagas disease; IgG isotype; Beagle dogs; Immunopathogenesis; Trypanosoma cruzi
• ISSN: 0165-2427; 1873-2534
• DOI: 10.1016/j.vetimm.2008.03.003

A systematic study following infection by various strains of the protozoan parasite,
Trypanosoma cruzi, and the simultaneous monitoring of the humoral immune response together with the elicited cellular response, could add greatly to our understanding of differences between strains of this important human pathogen. In that sense, acute and chronic infections with distinct
T. cruzi strains (Y, Berenice-78 and ABC) in Beagle dogs were studied through a longitudinal evaluation of immunoglobulin G (IgG), IgG1 and IgG2 isotypes (by ELISA and flow cytometry (FC)), as well as measurements of peripheral blood mononuclear cell (PBMC) proliferation over a 100-week period, and their correlation with cardiomegaly. Our results show that infected animals presenting cardiomegaly showed lower or absent levels of IgG1 during the chronic phase of the infection, when compared to those that did not show an increase in heart weight. In that manner, our results suggest that IgG1 could be used as a marker for cardiac pathogenicity in Chagas disease.