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    Por favor, use este identificador para citar o enlazar este ítem:http://uvadoc.uva.es/handle/10324/4486

    Título
    Disruption o proteoglycans in neural tube fluid by B-
    Autor
    Gato Casado, Ángel LuisAutoridad UVA Orcid
    Alonso Revuelta, María IsabelAutoridad UVA Orcid
    Moro Balbás, José AntonioAutoridad UVA Orcid
    Barbosa Ayucar, EnriqueAutoridad UVA
    Año del Documento
    1998
    Editorial
    Wiley-Liss
    Descripción
    Producción Científica
    Documento Fuente
    The Anatomical Record, 1998, 252, p.499-508
    Résumé
    Following neurulation, the anterior end of the neural tube undergoes a dramatic increase in size due mainly to the enlarging of the brain cavity. This cavity is filled with so-called neural tube fluid (NTF), whose positive pressure has been shown to play a key role in brain morphogenesis. This fluid contains a water-soluble matrix, rich in chondroitin sulfate (CS), which has been proposed as an osmotic regulator of NTF pressure genesis. The purpose of the present study is to observe the influence of CS on NTF osmolality and its relation to NTF hydrostatic pressure and brain expansion. NTF was obtained by means of microaspiration from the mesencephalic cavity of chick embryos. The osmolality of NTF between H.H. stages 20 and 29 was measured on the basis of its cryoscopic point. CS synthesis was disrupted by using 13-D-xyloside and the induced variations in brain volume were measured by means of morphometry. We also measured the variations in NTF osmolality, hydrostatic pressure, and the concentration of CS and sodium induced by means of 13-D-xyloside. Our data reveal that, at the earliest stages of development analyzed, variations in NTF osmolality show a characteristic pattern that coincides with the developmental changes in the previously described fluid pressure. Chick embryos treated with 13-D-xyloside, a chemical that disrupts CS synthesis, displayed a notable increase in brain volume but no other apparent developmental alterations. Morphometric analysis revealed that this increase was due to hyperenlargement of the brain cavity. 13-D-xyloside brings about specific changes in the biochemical composition of NTF, which entails a large increase in CS concentration, mainly in the form of free chains, and in that of sodium. As a result, the fluid’s osmolality and brain intraluminal pressure increased, which could account for the increase in size of the brain anlage. These data support the hypothesis that the intraluminal pressure involved in embryonic brain enlargement is directly dependent on NTF osmolality, and that the concentrations of CS and its associated microions could play a key role in the regulation of this process. Anat. Rec. 252:499– 508, 1998. © 1998 Wiley-Liss, Inc.
    Materias (normalizadas)
    Neuroanatomia
    Embriología
    ISSN
    1552-4914
    Revisión por pares
    SI
    Idioma
    eng
    URI
    http://uvadoc.uva.es/handle/10324/4486
    Derechos
    openAccess
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