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Les corps myeloïdes de l'epithelium pigmentaire rétinien

II. Origine et cytochimie ultrastructurale

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Summary

Myeloid bodies of the retinal pigment epithelium of different vertebrates were investigated by various techniques of fixation, dehydration, embedding and staining. After classical fixation with buffered glutaraldehyde and osmium, the intersaccular space is narrow (junction complexes) and a dense line is sometimes visible in the middle of the intrasaccular space. With permanganate fixative this dense line is always visible; it represents probably the fusion of the unit-membranes. The negative staining demonstrates the presence of proteins between the saccules. Dehydration by water soluble “Durcupan” shows a lipidic component in the intrasaccular space, which is removed by methanol-chloroform and partly by the classical ethanol dehydration.

The existence of myeloid bodies is demonstrated in the bird-embryo a few days before birth. They originate from granular reticulum cisternae. They are not of Golgi origin: glycoprotein cannot been demonstrated at their level.

Résumé

Les corps myéloïdes de l'épithélium pigmentaire rétinien ont été observés après différentes techniques de fixation, déshydratation, inclusion et coloration. Après fixation classique par le glutaraldéhyde et l'osmium, l'espace intersacculaire apparaît réduit (jonctions) et une ligne dense est parfois observable dans l'espace intrasacculaire. La fixation par le permanganate met en évidence de façon permanente cette ligne dense qui correspondrait à la fusion des membranes. La coloration négative caractérise un constituant protéique entre les saccules. La déshydratation par le Durcupan hydrosoluble met en évidence un matériel lipidique intrasacculaire qui est extrait par le méthanol-chloroforme et partiellement par la déshydratation alcoolique classique.

Les corps myéloïdes apparaissent plusieurs jours avant l'éclosion chez l'oiseau. Ils se forment à partir du réticulum granulaire. Ils ne peuvent être confondus avec les dictyosomes Golgiens : Ils ne contiennent pas de glycoprotéines.

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Chargé de Recherche à l'I.N.S.E.R.M. (contrat n° 711.152). Avec la collaboration technique de L. Salin et D. Joseph.

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Anh, J.N.H. Les corps myeloïdes de l'epithelium pigmentaire rétinien. Z.Zellforsch 131, 187–198 (1972). https://doi.org/10.1007/BF00306926

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