ULTRASTRUCTURAL-CHANGES IN THE GASTRODERMAL PHAGOCYTIC-CELLS OF THE PLANARIAN DUGESIA-GONOCEPHALA S1 DURING FOOD DIGESTION (PLATHELMINTHES)
ULTRASTRUCTURAL-CHANGES IN THE GASTRODERMAL PHAGOCYTIC-CELLS OF THE PLANARIAN DUGESIA-GONOCEPHALA S1 DURING FOOD DIGESTION (PLATHELMINTHES)
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DOI：
10.1007/bf00539786
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发表时间：
1988-01-01
期刊：
影响因子：
1
通讯作者：
GAMO, J
中科院分区：
文献类型：
--
作者：
GARCIACORRALES, P;GAMO, J
In the present report the functional morphology of the planarian gastrodermal phagocytic cells is examined in feeding animals. A functional interpretation of some of the morphological findings is given. The events in the finestructure modifications of the phagocytic cells in the course of phagocytosis and intracellular digestion of food particles were followed through five post-feeding stages in the planarian Dugesia gonocephala. Light and electron microscopical observations demonstrate that there is preliminary intraluminal digestion of food particles; their phagocytosis takes place quickly. Beef hepatocytes that served as food as found engulfed at first in food vascuoles near the apical border of the phagocytic cells, and are clearly recognizable. The vacuoles increase in number of occupy most of the cytoplasm of these cells. Progressive breakdown and disappearance of phagocytosed hepatocytes occurs. In time the vacuoles move deeper into the cells, their contents lose their identity, and condense to homogeneous or heterogenous residual bodies. These are returned to the distal surface of the cells, and then voided into the intestinal humen. At the same time, synthesis and accumulation of numerous lipid droplets occurs, probably as a final product resulting from metabolism of the digested material. When feeding is over, the phagocytic cells are filled with lipid droplets, acquiring their typical appearance. It is suggested that disintegration of phagocytic cells during starvation is balanced by proliferation and differentiation of neoblasts into new phagocytic cells during the feeding-starvation cycle.
