Serum and aqueous humour cytokine response and histopathological alterations during ocular Toxoplasma gondii infection in C57BL/6 mice

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dc.contributor.authorCalabrese, K. S.
dc.contributor.authorTedesco, R. C. [UNIFESP]
dc.contributor.authorValle, T. Zaverucha do
dc.contributor.authorBarbosa, H. S.
dc.contributor.institutionFundacao Oswaldo Cruz
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.date.accessioned2016-01-24T13:51:57Z
dc.date.available2016-01-24T13:51:57Z
dc.date.issued2008-12-01
dc.description.abstractToxoplasma 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-gamma levels both in serum and aqueous humour of infected mice in opposition to a decrease in IL-10 levels. On the other hand, TGF-beta was high, whereas IL-12 and TNF-alpha 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. (C) 2008 Published by Elsevier B.V.en
dc.description.affiliationFundacao Oswaldo Cruz, Inst Oswaldo Cruz, Lab Biol Estrutural, BR-21040900 Rio de Janeiro, Brazil
dc.description.affiliationFundacao Oswaldo Cruz, Inst Oswaldo Cruz, Lab Imunomodulacao, BR-21040900 Rio de Janeiro, Brazil
dc.description.affiliationUniversidade Federal de São Paulo, Disciplina Anat Topograf & Descritiva, Escola Paulista Med, Dept Morfol, BR-04023900 São Paulo, Brazil
dc.description.affiliationUnifespUniversidade Federal de São Paulo, Disciplina Anat Topograf & Descritiva, Escola Paulista Med, Dept Morfol, BR-04023900 São Paulo, Brazil
dc.description.sourceWeb of Science
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipInstituto Oswaldo Cruz
dc.description.sponsorshipIDCNPq: 151754/2005-5
dc.format.extent1335-1341
dc.identifierhttp://dx.doi.org/10.1016/j.micron.2008.02.003
dc.identifier.citationMicron. Oxford: Pergamon-Elsevier B.V., v. 39, n. 8, p. 1335-1341, 2008.
dc.identifier.doi10.1016/j.micron.2008.02.003
dc.identifier.issn0968-4328
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/31080
dc.identifier.wosWOS:000260873600039
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofMicron
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.rights.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.subjectOcular toxoplasmosisen
dc.subjectToxoplasma gondiien
dc.subjectEyeen
dc.subjectCytokinesen
dc.subjectC57BL/6 miceen
dc.titleSerum and aqueous humour cytokine response and histopathological alterations during ocular Toxoplasma gondii infection in C57BL/6 miceen
dc.typeinfo:eu-repo/semantics/article
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