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Fonction catabolique de l'épithélium mammaire

Etude histochimique et ultrastructurale

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Summary

The histochemical (iron, lipopigments, acid phosphatase, leucine aminopeptidase) and cytologic (lysosomes) changes occuring during pregnancy, lactation and involution of mouse, rat, rabbit, guinea-pig mammary glands are studied by light microscopy and electron microscopy.

In all the animals examined, the mammary epithelium has an intracellular digestive system which is adapted to subserve two functions. The first one is the segregation of cytoplasmic components which often precedes cellular involution. The second one is the regulation of secretory processes in the non lactating glands. This digestion of endogenous materials results in the formation of various lytic bodies: dense bodies sometimes containing ferritin, vacuolated dense bodies with membranous residues, autophagic vacuoles. The lysosomes can give large complex dense bodies like lipofuscin pigments with or without ferritin.

Leucine aminopeptidase which always disappears in the mouse mammary epithelium during lactation is not present in rat, rabbit, guinea-pig mammary epithelium. In these species only the vascular tissue contains the enzyme. This observation indicates that leucine aminopeptidase does not take care of the overproduction of secretory products in the non-lactating glands.

Acid phosphatase is concentrated in secretory granules and in lytic bodies: multivesicular bodies, dense bodies with ferritin, vacuolated dense bodies, lipopigments. This enzyme constitutes probably a mechanism for controlling and triggering the destruction of the secretory material with no active elimination.

The iron of the mammary epithelium appears in virgin mice older than 30 weeks and in mice, rats, rabbits, guinea-pigs during glandular cells involution. This is a catabolic iron located in lysosomes. Its amount depends upon the iron content of the milk and upon the competitive secretory and catabolic activities of the glandular cells. An explanation of iron disappearance during a second pregnancy and lactation is discussed.

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Girardie, J. Fonction catabolique de l'épithélium mammaire. Zeitschrift für Zellforschung 80, 385–412 (1967). https://doi.org/10.1007/BF00339330

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