Male Accessory Sex Organs. Structure and Function in Mammals by David Brandes

By David Brandes

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Sample text

Both forms of the enzyme are synthetized at the RER and subsequently transported to the Golgi to be packed either in secretory granules or in lysosomes. In order for the enzyme to be distributed in separate organelles a different molecular structure would be required for recognition and selective packing, but this could also be the result of a subunit structure (VanhaPerttula et al, 1972) or differences in the content of neuraminic acid (Ostrowski et al, 1970). Regardless of the mechanism by which the two types of acid phosphatase become separated in the Golgi into secretory or lysosomal enzymes, their functions and properties are clearly distinct.

RER: synthesis of secretory proteins. Pinocytosis: transport of macromolecules from the lumen into the cells. , 1972. 2. , 1969; Jacques, 1969). It required the experimental approach, using dyes, exogenously administered enzymes, and colloidal particles as markers, to substantiate the concept of transport by endocytosis in the absorbing cells of the epididymis and ductus deferens. Earlier light microscopic studies (Mason and Shaver, 1952; Shaver, 1954; see this article for previous bibliography) using trypan blue and India ink injected beneath the albuginea or into the rete testes confirmed the absorptive capacities of the epithelium of the ductuli efferentes and the proximal portion of the epididymis, with indications of surface attachment and transcellular flow up to the basal regions of the cells.

45) as well as in the droplets present toward the base of the cell (Fig. 46). By comparing these last two figures with Fig. 41, it can be seen that most of vacuoles and droplets, regardless of the density of their content, show lysosomal enzyme activity. Although the suggested participation of lysosomes in the digestion of absorbed materials seems reinforced by these cytochemical findings, the exact way in which lysosomal enzymes gain access to vacuoles and absorption droplets is not as yet clearly established.

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