Summary
In the adult carp, the ultrastructure of the enterocytes of the distal segment of the medium intestine is similar to that of the intestinal cells of certain mammals during the neonatal period. Frequent aspects of pinocytosis are visible at the base of a plateau of already developed microvillosities. The apical cytoplasm shows the presence of a dense tubulo-vesicular network. The vacuoles which separate off run together to form a voluminous supranuclear body. Their P.A.S. positive and orthochromatic contents are rich in alkaline phosphatases. The permeability of this epithelium to macromolecules is demonstrated by the administration of “Horseradish Peroxidase” (HRP). This protein penetrates by pinocytosis into the apical tubulo-vesicular system and reaches the blood circulation via the extra-cellular spaces. The presence of certain structures involved in protein transport following a period of experimental fasting of six months reflects their independence with regard to exogenous supplies.
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This study has been carried out thanks to a grant by the C.N.R.S. (R.C.P. No 250), and with the electron microscope of the department of plant Biology (Professor Leredde) kindly placed at our disposal by Mr. B. Lugardon. We are also grateful to Mrs A. Rup for her technical assistance.
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Noaillac-Depeyre, J., Gas, N. Absorption of protein macromolecules by the enterocytes of the carp (Cyprinus carpio L.). Z.Zellforsch 146, 525–541 (1973). https://doi.org/10.1007/BF02347181
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DOI: https://doi.org/10.1007/BF02347181