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ldentification of extraretinal photoreceptors in the teleost Phoxinus phoxinus

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dc.contributor.authorÁlvarez-Viejo, M.es
dc.contributor.authorCernuda-Cernuda, R.es
dc.contributor.authorÁlvarez-López, C.
dc.contributor.authorGarcía-Fernández, J.M.
dc.date.accessioned2011-06-08T09:08:15Z
dc.date.available2011-06-08T09:08:15Z
dc.date.issued2004
dc.description.abstractThe existence of cells capable of detecting changes of the photoperiod within the deep brain, the socalled deep brain photoreceptors, was proposed in the early years of the twentieth century. By using immunocytochemistry with antisera against phototransductory proteins on paraffin and vibratome sections, we have localized severa1 positive areas in the brain of the teleost Phoxinus phoxinus. These areas were restricted to two encephalic regions: the epithalamus and the hypothalamus. Immunopositive (rod-opsin- and a-transducin-like) pinealocytes and parapinealocytes, as well as some sparse neurons in the habenula, were seen in the epithalamus. The irnmunoreaction of the hypothalamus was represented by a-transducin-like positive (magnocellular and parvicellular) neurons of the Nucleus Preopticus, as well as by a-transducin- and arrestin-like positive fibers corresponding to the hypothalamic-hypophyseal tract and a few fibers running towards the basa1 telencephalon. These findings corroborate the data published on other teleost fish and fully support the hypothesis of the presence of photosensitive cells in the encephalon of lower vertebrates. The labelling with antisera against different components of the phototransductory cascade also strengthens the idea that such cells employ a biochemical mechanism similar to that in the retinal visual photoreceptor cells, rods and cones. Although the function is still unclear, the detection of the photoperiod seems to be the most likely role for these extraretinal photoreceptors.es
dc.formatapplication/pdfes
dc.format.extent8es
dc.identifier.issn0213-3911es
dc.identifier.urihttp://hdl.handle.net/10201/21554
dc.languageenges
dc.publisherMurcia : F. Hernándezes
dc.relation.ispartofHistology and histopathologyes
dc.rightsinfo:eu-repo/semantics/openAccesses
dc.subjectOpsines
dc.subjectTeleostses
dc.subject.otherCDU::6 - Ciencias aplicadas::61 - Medicinaes
dc.titleldentification of extraretinal photoreceptors in the teleost Phoxinus phoxinuses
dc.typeinfo:eu-repo/semantics/articlees
dspace.entity.typePublicationes
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Histology and histopathology Vol.19, nº 2 (2004)