Please use this identifier to cite or link to this item: https://www.arca.fiocruz.br/handle/icict/32576
Title: Serum and aqueous humour cytokine response and histopathological alterations during ocular Toxoplasma gondii infection in C57BL/6 mice
Authors: Calabrese, K. S.
Tedesco, R. C.
Valle, T. Zaverucha do
Barbosa, Helene S.
Affilliation: Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Imunomodulação. Rio de Janeiro, RJ. Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia Estrutural. Rio de Janeiro, RJ. Brasil / Universidade Federal de São Paulo. Escola Paulista de Medicina. Departamento de Morfologia, Disciplina de Anatomia Topográfica e Descritiva. São Paulo, SP, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Imunomodulação. Rio de Janeiro, RJ. Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia Estrutural. Rio de Janeiro, RJ. Brasil.
Abstract: Toxoplasma gondii, an obligate intracellular protozoan parasite, infects most species of warm-blooded animals, and in humans it causes toxoplasmosis. Healthy people that become infected rarely present clinical symptoms because the immune system prevents the parasite from causing illness. Congenital toxoplasmosis may result in abortion, hydrocephalus, as well as neurological and ocular disease (most frequently retinochoroiditis) of the newborn. In immunocompromised patients, reactivation of latent disease can cause encephalitis. Cell-mediated immunity to T. gondii antigens involves innate acute inflammatory responses and antigen-specific adaptive immunity. Considering the complexity of the immunological events triggered during toxoplasmosis, systemic and local responses were evaluated by cytokine measurements. Aqueous humour and serum were obtained from non-infected and T. gondii Me-49 strain infected C57BL/6 mice for cytokine quantification. Histopathological analyses were made with eyes enucleated from mice after 30 days of infection. ELISA assays showed an increase of IFN-g levels both in serum and aqueous humour of infected mice in opposition to a decrease in IL-10 levels. On the other hand, TGF-b was high, whereas IL-12 and TNF-a were present in small levels in both groups. We also detected higher levels of IL-4 and IL-6 in aqueous humour than in serum of infected mice when compared to the control group. MIP-2 presented no significant differences between the two groups. Fas and Fas-L were also present in similar levels in serum of non-infected and infected mice, but both chemokines were increased in the aqueous humour of infected mice. Histopathological analysis of infected mice showed inflammatory infiltrates around blood vessels and alteration of the outer photoreceptor segments, on the external and inner nuclear layer. Parasites were observed in 82% of eyes, inside the blood vessels associated with inflammatory infiltrate. Edema, characterized by the increase of interstitial spaces between the FTR, forming lacunae was also noted. These alterations take the form of projections (retino-vitreal), characteristic of retinochoroiditis. In conclusion, T. gondii infection of C57BL/6 mice revealed that cytokine patterns alone do not assure susceptibility or resistance against infection, thus reinforcing the notion that it is necessary more than cytokine dosage to determine Th1 or Th2 profile in this model.
Keywords: Ocular toxoplasmosis
Toxoplasma gondii
Eye
Cytokines
C57BL/6 mice
keywords: Toxoplasma gondii
Citocinas
Toxoplasmose Ocular
Olho
Issue Date: 2008
Publisher: Elsevier
Citation: CALABRESE, Katia da Silva et al. Serum and aqueous humour cytokine response and histopathological alterations during ocular Toxoplasma gondii infection in C57BL/6 mice. Micron, v. 39, p. 1335-1341, 2008.
DOI: 10.1016/j.micron.2008.02.003
ISSN: 0968-4328
Copyright: restricted access
Appears in Collections:IOC - Artigos de Periódicos

Files in This Item:
File Description SizeFormat 
KatiaCalabrese_HSBarbosa_etal_IOC_2008.pdf802.1 kBAdobe PDF    Request a copy



FacebookTwitterDeliciousLinkedInGoogle BookmarksBibTex Format mendeley Endnote DiggMySpace

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.