Chondroitin sulfate proteoglycans are structural renewable constituents of the rabbit vitreous body

Chondroitin sulfate proteoglycans are structural renewable constituents of the rabbit vitreous body

Autor Goes, Rejane M. Google Scholar
Nader, Helena Bonciani Autor UNIFESP Google Scholar
Porcionatto, Marimélia Aparecida Autor UNIFESP Google Scholar
Haddad, Antonio Google Scholar
Laicine, Eduardo M. Google Scholar
Instituição Universidade de São Paulo (USP)
UNESP
Universidade Federal de São Paulo (UNIFESP)
Resumo Purpose: To characterize the vitreous intrinsic proteoglycans, investigate their dynamics, and examine their role in the supramolecular organization of the vitreous. Methods: Vitreous from normal rabbits was collected and processed for observation with the transmission electron microscope after treatment with glycosidases. Also, rabbits were injected intravitreally with [S-35]-sodium sulfate and sacrificed at several time intervals after the injection. Proteoglycans (PGs) were assayed in the vitreous supernatant or in whole samples extracted with guanidine hydrochloride by polyacrylamide or agarose gel electrophoresis, followed respectively by fluorography or autoradiography, and ion-exchange chromatography and gel-filtration chromatography, combined with glycolytic treatment of the samples. the sulfated glycosaminoglycans (GAGs) were characterized by agarose gel electrophoresis after treating vitreous samples with protease and specific glycosidases. Results: the electron microscopic study revealed a network with hyaluronic acid ( HA) as thin threads coating and connecting collagen fibrils. the elimination of the HA coat showed chondroitin sulfate granules (8-25 nm) arranged at regular intervals on the fibril surface. the chondroitinase ABC digestion, besides removing the granules, also caused the formation of thicker bundles of the collagen fibrils. the PG and GAG analysis indicated that there are three renewable PGs in the vitreous ( e. g., one heparan-and two chondroitin-sulfate ones). Conclusions: At least one of the chondroitin sulfate PGs is involved in the interactions that occur in the vitreous structure, mainly by providing adequate spacing between the collagen fibrils, a condition that is probably required for the transparency of the vitreous.
Palavra-chave collagen
chondroitin and heparan sulfate proteoglycans
hyaluronic acid
ultrastructure
vitreous body
Idioma Inglês
Data de publicação 2005-05-01
Publicado em Current Eye Research. Philadelphia: Taylor & Francis Inc, v. 30, n. 5, p. 405-413, 2005.
ISSN 0271-3683 (Sherpa/Romeo, fator de impacto)
Publicador Taylor & Francis Inc
Extensão 405-413
Fonte http://dx.doi.org/10.1080/02713680590934148
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000230106800009
Endereço permanente http://repositorio.unifesp.br/handle/11600/28287

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