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Postnatal neurogenesis in the medial cortex of the tropical lizard Tropidurus hispidus.
Marchioro, M; Nunes, J-M de Azevedo Mota; Ramalho, A M Rabelo; Molowny, A; Perez-Martinez, E; Ponsoda, X; Lopez-Garcia, C.
Afiliação
  • Marchioro M; Laboratorio de Neurofisiologia, Departamento de Fisiologia, Universidade Federal de Sergipe, São Cristóvão-SE, 49100-000, Brazil.
Neuroscience ; 134(2): 407-13, 2005.
Article em En | MEDLINE | ID: mdl-15961247
Young, adult and presumed old specimens of the tropical lizard Tropidurus hispidus, living in an almost steady warm habitat, have been the subjects of a 5-bromodeoxiuridine immunocytochemical study to label proliferating brain cells. All animals showed abundant 5-bromodeoxiuridine-labeled nuclei in the ependyma of their telencephalic lateral ventricles, with these being especially abundant in the medial cortex ependyma. Surprisingly, adult animals displayed higher numbers of labeled nuclei when compared with those of young specimens. In a second experiment, in order to check the evolution of ependymal-labeled nuclei, adult specimens were allowed 4 h or 2, 4, 7, 15 or 30 days of survival after the 5-bromodeoxiuridine pulse. Most labeled nuclei appeared isolated at short survival times (4 h and 2 days after the 5-bromodeoxiuridine pulse) but from day 4 and beyond, labeled nuclei appeared in couples or groups usually located in the ependyma. Labeled nuclei with vertical fusiform appearance in the inner plexiform layer or even recruited in the medial cortex cell layer were assumed to be migratory. These presumed migratory nuclei were unexpectedly few (less than 30%) when compared with other lizards, and they appeared much later; at 15 and 30 days after the pulse. This situation resembles that of mammals where only a small proportion of postnatally generated neurons can develop and survive.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Córtex Cerebral / Lagartos Limite: Animals País/Região como assunto: America do sul / Brasil Idioma: En Revista: Neuroscience Ano de publicação: 2005 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Córtex Cerebral / Lagartos Limite: Animals País/Região como assunto: America do sul / Brasil Idioma: En Revista: Neuroscience Ano de publicação: 2005 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos