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Angiogenesis and schistosomal granuloma formation

DOI: 10.1590/S0074-02762005000200012

Keywords: schistosoma mansoni, periovular granuloma, angiogenesis.

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Abstract:

an increasing amount of evidences points to angiogenesis as playing a paramount role in fibrosis development. however, granulomas in general, and periovular schistosomal granulomas in particular, are considered avascular structures, although they usually result in dense areas of focal fibrosis. in order to clarify this apparent paradox, the presence of blood vessels was systematically searched in hepatic schistosomal granulomas of mice, during different stages of the infection, and at different stages of granuloma evolution, by means of vascular injections of colored masses, demonstration of laminin in vascular basement membranes and by ultra structural analysis. vascular proliferation appeared evident at the early stages of granuloma formation, gradually decreasing thereafter, older granulomas becoming almost avascular structures, sometimes delimited at the periphery by a rich vascular network.

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