抄録
Using cytochemical techniques, structural details of the Golgi apparatus were investigated under conventional and high voltage electron microscopes. Mouse duodenal absorptive epithelial cells in the crypt-base show cellular maturation during cell migration toward the tip of villus. The Golgi apparatus and its related structures also manifest several remarkable differences between immature cells located in lower part of the crypt and the mature cells in lower villus or midvillus. In immature cells in the crypt, the Golgi apparatus was well organized; simple stacking of cisternae and sparsely distributed rough ER often show face-to-face attachments not only to the trans-most cisterna of the Golgi stack, but also to the cis-most. In mature cells located at villus-base or mid-villus, the Golgi stack shows considerable development: a wavy folding to form a large highly-complex network. In the trans-side, at least three kinds of structures can be distinguished: lamellar cisterna, large-sized lipid granules (0.3-1.0μm in diameter) and trans-tubular network. The lamellar cisterna shows extraordinary independence from other Golgi stack, and it tends to detach or “peel off” from the Golgi stack. These three structures are related by structural transitions. The latter two components appeared to derive from the lamellar cisterna. In the cis-side, besides the meshed cisterna being characteristic to the cis-most cisterna, small-sized lipid granules (50nm in diameter) were often observed in the cis-most cisterna. Furthermore, cis-most cisternae have direct connections to tubular structures which extended from the apical cytoplasm. This structure is different from the trans-tubular network and contain small lipid granules identical to those observed in cis-most cisterna. From these observations, we postulate that substantial transport through Golgi apparatus might be promoted by cisterna progression from cis to trans side.
