Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/199031
Type: Artigo de periódico
Title: Hypoxia, Hypoxia-inducible Factor-1α And Vascular Endothelial Growth Factor In A Murine Model Of Schistosoma Mansoni Infection.
Author: Araújo, Alexandra Paiva
Frezza, Tarsila Ferraz
Allegretti, Silmara Marques
Giorgio, Selma
Abstract: Schistosomiasis mansoni is a chronic parasitic disease where much of the symptomatology is attributed to granuloma formation, an immunopathological reaction against Schistosoma eggs. To more clearly understand the immunopathology of schistosomiasis, the tissue microenvironment generated by S. mansoni infected mice was investigated. Using the hypoxia marker pimonidazole, we provide immunohistochemical evidence that hypoxia occurred in inflammatory cells infiltrated around the eggs and cells surrounding granulomas in the liver, intestine, spleen and lungs of infected mice. Hypoxia-inducible factor-1α (HIF-1α) was mainly expressed in inflammatory cells surrounding the eggs and in hepatocytes surrounding cellular and fibrocellular granulomas in infected mouse liver. HIF-1α expression was also verified in granulomas in the other tissues tested (intestine, spleen and lungs). Vascular endothelial growth factor (VEGF) expression was observed in the extracellular space surrounding inflammatory cells in liver granuloma. The VEGF expression pattern verified in infected mouse liver was very similar to that observed in the other tissues tested. A strong positive correlation occurred between pimonidazole binding and HIF-1α and VEGF expression in the tissues tested, except for lung. This work is the first evidence that infection by a helminth parasite, S. mansoni, produces a hypoxic tissue microenvironment and induces HIF-1α and VEGF expression.
Subject: Animals
Cell Hypoxia
Disease Models, Animal
Female
Granuloma
Hypoxia-inducible Factor 1, Alpha Subunit
Immunohistochemistry
Mice
Schistosomiasis Mansoni
Vascular Endothelial Growth Factor A
Rights: fechado
Identifier DOI: 10.1016/j.yexmp.2010.09.003
Address: http://www.ncbi.nlm.nih.gov/pubmed/20858486
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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