Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/5421
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dc.contributor.authorCristóvão, Armando J.-
dc.contributor.authorOliveira, Catarina R.-
dc.contributor.authorCarvalho, Caetana M.-
dc.date.accessioned2008-09-01T15:42:00Z-
dc.date.available2008-09-01T15:42:00Z-
dc.date.issued2002en_US
dc.identifier.citationInternational Journal of Developmental Neuroscience. 20:1 (2002) 1-9en_US
dc.identifier.urihttp://hdl.handle.net/10316/5421-
dc.description.abstractThe activity and the subunit expression of [alpha]-amino-3-hydroxy-5-methylisoxazole-4-propionate (AMPA)/kainate ionotropic glutamate receptors were studied in retina cells developing in chick embryos and in retina cells cultured as retinospheroids, at the same stages of development. In the retinospheroids, the activity of the AMPA/kainate receptors was monitored by following the changes in the intracellular free calcium concentration ([Ca2+]i), in response to AMPA, kainate or to -glutamate, and the expression of the receptor subunits GluR1, GluR2/3, GluR4 and GluR6/7 was determined in the retinospheroids and in chick retinas by immunodetection using polyclonal antibodies. The changes in [Ca2+]i in response to 400 [mu]M kainate increased from 5 h in vitro to 3 days, and remained constant until day 14, whereas the [Ca2+]i in response to 500 [mu]M -glutamate or 400 [mu]M AMPA increased from 5 h in vitro to 3 days, and thereafter decreased slightly until day 14. The [Ca2+]i responses to kainate are mainly due to AMPA receptor stimulation, since the signals were abolished by LY303070, the AMPA receptor antagonist, and were not affected by MK-801, the NMDA receptor antagonist. In retinospheroids, the levels of expression of GluR1 subunit increased from 5 h in vitro until day 7, then decreased until day 14. The levels of expression of GluR2/3 and GluR4 subunits increased from 5 h in vitro until day 10, and remained constant until day 14. The levels of kainate receptor subunits GluR6/7 increased from 5 h in vitro until day 3, and thereafter decreased slightly until day 14. In the retinas, the expression of GluR1 and GluR6/7 subunits increased from day 8 until day 15, and then decreased until day 22 (post-natal 1). The subunits GluR2/3 and GluR4 increased from day 8 until day 18, and remained constant until day 22. The results suggest that AMPA/kainate receptors are expressed at early embryonic stages, although at low levels and before synapse formation (E12). However, the AMPA receptors are not completely functional at the first stage studied since they do not respond to the agonist AMPA. Also, the patterns of AMPA/kainate receptor subunit expression in retinospheroids of chick embryo retina cells cultured in vitro and in retina cells developing in the embryo (in vivo) were similar, indicating that the AMPA/kainate receptor subunits expression in these primary cultures mimics their expression in the developing chick retina.en_US
dc.description.urihttp://www.sciencedirect.com/science/article/B6T01-45CW0B3-1/1/a35858f1d7808b1301de428de93fa9e1en_US
dc.format.mimetypeaplication/PDFen
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectRetinospheroidsen_US
dc.subjectKainateen_US
dc.subjectGluR2/3en_US
dc.subjectGluR6/7en_US
dc.subjectDevelopmenten_US
dc.titleExpression of AMPA/kainate receptors during development of chick embryo retina cells: in vitro versus in vivo studiesen_US
dc.typearticleen_US
uc.controloAutoridadeSim-
item.fulltextCom Texto completo-
item.languageiso639-1en-
item.grantfulltextopen-
crisitem.author.deptFaculdade de Ciências e Tecnologia, Universidade de Coimbra-
crisitem.author.parentdeptUniversidade de Coimbra-
crisitem.author.researchunitCNC.IBILI-
crisitem.author.orcid0000-0002-4090-3269-
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais
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