Summary
The elaboration of the basal lamina of telencephalic capillaries has been studied by autoradiography in chick embryos from day 16 to 19 of incubation. The cerebral vascular basal lamina is actively synthesized during the period of these stages of development. The animals were sacrificed 2, 15, 40 and 180 min after intravenous injection of 3H-proline. The hydroxylation of proline to hydroxyproline in the “secretory” cells permits their identification.
Our observations suggest that endothelial cells, pericytes and perhaps glial cells participate in this elaboration. The various stages of the synthesis are performed sequentially in the ergastoplasm and then in the Golgi apparatus before the secretory material is released by exocytosis.
Résumé
L'élaboration de la lame basale des capillaires télencéphaliques a été étudiée en autoradiographie chez des embryons de Poulet âgés de 16 à 19 jours d'incubation. C'est au cours de cette période du développement que la basale des vaisseaux cérébraux est activement synthétisée.
Les animaux furent sacrifiés 2,15, 40 et 180 min après le début de l'injection intraveineuse d'une solution de proline tritiée. L'identification des cellules participant à la synthèse de la basale est facilitée par le fait que l'hydroxylation de la proline en hydroxyproline y est réalisée.
Nos observations nous permettent de suggérer une participation active des cellules endothéliales, des péricytes, et peut-être des cellules gliales, à l'élaboration de la lame basale. Les différentes étapes de cette synthèse ont lieu, par ordre chronologique, dans l'ergastoplasme, puis dans l'appareil de Golgi, avant que le produit élaboré ne soit libéré dans l'espace périvasculaire par exocytose.
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This work was supported by grants from CNRS (ERA 331, Laboratoire de Physiologie Générale I, Faculté des Sciences, Nancy I, 54037 — Nancy-Cedex, France) and from the Recherche Médicale Française
The authors are grateful to Dr. M. Mazzuca for helpful suggestions on the manuscript, to Mrs. Ch. Pelletier and Mrs. B. Coisne for secretarial assistance and to Miss. M.-Ch. Thuillier for technical assistance
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Delorme, P., Grignon, G. An autoradiographic study on the biosynthesis of the capillary basal lamina in the chick embryo telencephalon. Cell Tissue Res. 192, 299–308 (1978). https://doi.org/10.1007/BF00220747
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DOI: https://doi.org/10.1007/BF00220747