Synthesis of elastic microfibrillar components fibrillin-1 and fibrillin-2 by human optic nerve head astrocytes in situ and in vitro

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dc.contributor.authorPena, JDO
dc.contributor.authorMello, PAA
dc.contributor.authorHernandez, M. R.
dc.contributor.institutionWashington Univ
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.date.accessioned2016-01-24T12:31:04Z
dc.date.available2016-01-24T12:31:04Z
dc.date.issued2000-05-01
dc.description.abstractThe purpose of this study was to identify elastic microfibrillar components fibrillin-1 and fibrillin-2 in optic nerve heads of adult normal and glaucomatous subjects. in cultured optic nerve head astrocytes (type 1B astrocytes), as well as fibrillin-1 in fetal optic nerve heads. To characterize synthesis and gene expression of microfibrillar proteins in human optic nerve heads and cultured type 1B astrocytes, light microscopy immunohistochemistry, in situ hybridization, and RT-PCR or Northern blots were performed. Our results demonstrated that fibrillin-1 was associated with blood vessels, astrocytes in the glial columns and cribriform plates, and with astrocyte processes in the nerve bundles in all samples. in glaucomatous optic nerves there was enhanced fibrillin-1 immunoreactivity, especially surrounding blood Vessels. Fibrillin-2 was localized primarily to brood Vessels in all samples, without qualitative differences between normal and glaucomatous samples, in fetal optic nerve heads fibrillin-1. mRNA was localized to glial cells and to the blood vessel walls, in adult optic nerve heads, there was little fibrillin-1 mRNA as detectable by in situ hybridization and RT-PCR. There was no detectable upregulation of fibrillin-1 mRNA in glaucoma. in cultured type 1B astrocytes, fibrillin-1 staining was mostly pericellular.. There was little fibrillin-2 immunoreactivity. in conclusion astrocytes from the optic nerve head deposit elastic microfibrillar components in situ and in vitro, with a predominance of fibrillin-1. Upregulation of fibrillin-1 mRNA was not observed in glaucoma, suggesting that increased transcription may occur early in the disease process. Cultures of type 1B astrocytes from the optic nerve head provides a useful model to study mechanisms regulating the interactions of elastin and the microfibrils in optic nerve head astrocytes. (C) 2000 Academic Press.en
dc.description.affiliationWashington Univ, Sch Med, Dept Ophthalmol & Visual Sci, St Louis, MO 63110 USA
dc.description.affiliationUniversidade Federal de São Paulo, Dept Ophthalmol, São Paulo, Brazil
dc.description.affiliationUnifespUniversidade Federal de São Paulo, Dept Ophthalmol, São Paulo, Brazil
dc.description.sourceWeb of Science
dc.format.extent589-601
dc.identifierhttp://dx.doi.org/10.1006/exer.1999.0817
dc.identifier.citationExperimental Eye Research. London: Academic Press Ltd, v. 70, n. 5, p. 589-601, 2000.
dc.identifier.doi10.1006/exer.1999.0817
dc.identifier.issn0014-4835
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/26300
dc.identifier.wosWOS:000087321200006
dc.language.isoeng
dc.publisherAcademic Press Ltd
dc.relation.ispartofExperimental Eye Research
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectastrocytesen
dc.subjectelastic fibersen
dc.subjectfibrillinen
dc.subjectglaucomaen
dc.subjectoptic nerve headen
dc.titleSynthesis of elastic microfibrillar components fibrillin-1 and fibrillin-2 by human optic nerve head astrocytes in situ and in vitroen
dc.typeinfo:eu-repo/semantics/article
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