Summary
The fine structure of the Minotian gland cell (spherical or granular club cell) and the phagocytic cell of the gastrodermis is described. The Minotian cells characteristically contain distinctive granules which are produced by the Golgi. Inclusion bodies containing membranous remains can also be found in the cytoplasm. The phagocytic cells bear groups of microvilli near adjacent junctions and have a much infolded basement membrane. Near the pharynx these cells contain the rod-shaped apical bodies found in the pharyngeal epithelium. Further into the intestine the cells more characteristically contain numerous phagocytic vacuoles and vacuolar dense bodies. After feeding, a consistent occlusion of the intestinal lumen has been observed. The columnar phagocytes have been shown to phagocytose cellular material and will also take up peroxidase and thorium oxide. The substances initially appear in the apical phagosomes. Acid phosphatase activity has been detected in the phagosomes after feeding. The enzyme is packaged in the Golgi and occurs in Golgi vacuoles and lysosomes of similar dimensions (morphologically vacuolar dense bodies). The fusion of lysosomes with phagosomes has been demonstrated histochemically.
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References
Arnold, G., 1909: Intracellular and general digestive processes inPlanariae. Quart. J. Micr. Sci.54, 207–220.
Barrett, A. J., 1969: Properties of lysomal enzymes. In: Lysosomes in biology and pathology (J. T. Dingle, andH. B. Fell, eds.).2, pp. 245–312. Amsterdam and London: North Holland Publishing Company.
Berg, G. G., andO. A. Berg, 1968: Presence of trimetaphosphatase in the turbellarianDugesia tigrina, and the relation of enzyme distribution to food uptake. T. Amer. Micros.87, 335–341.
Bowen, I. D., 1968: Electron-cytochemical studies on autophagy in the gut epithelial cells of the locust,Schistocerca gregaria. Histochem. J.1, 141–151.
—, andT. A. Ryder, 1973: The fine structure of the PlanarianPolycelis tenuis (Iijima). I. The Pharynx. Protoplasma78, 223–241.
Burstone, M. S., 1962: Enzyme histochemistry and its application to the study of neoplasms. New York and London: Academic Press.
Duve, C. de, andR. Wattiaux, 1966: Functions of lysosomes. Ann. Rev. Physiol.28, 435–492.
Gomori, G., 1952: Microscopic histochemistry. Chicago, Illinois: University of Chicago Press.
Hauser, P. J., 1956: Histologische Umbauvorgänge im Planariendarm bei der Nahrungsaufnahme. Mikroskopie11, 20–31.
Horne, M. K., andJ. T. Darlington, 1967: Uptake and intracellular digestion of ferritin in the planarianPhagocata gracilis (Haldeman). T. Amer. Microsc.86, 268–273.
Iijima, I., 1884: Untersuchungen über den Bau und die Entwicklungsgeschichte der Süß-wasser-Dendrocoelen (Tricladen). Z. f. wiss. Zoologie40, 359–464.
Ishii, S., 1965: Electron microscopic observations on the planarian tissues, 11. The intestine. Fukushima J. Med. Sci.12, 67–87.
Jennings, J. B., 1957: Studies on feeding, digestion and food storage in free-living flatworms (Platyhelminthes: Turbellaria). Biol. Bull.112, 63–80.
—, 1959: Observations on the nutrition of the land planarianOrthodermus terrestris (O. F. Muller). Biol. Bull.117, 119–124.
—, 1962: Further studies on feeding and digestion in triclad turbellaria. Biol. Bull.123, 571–581.
—, 1968: Platyhelminthes, Nutrition. In: Chemical zoology (M. Florkin, andB. T. Scheer, eds.),2, p. 640. New York and London: Academic Press.
Kelley, E. G., 1931: The intracellular digestion of thymus nucleoprotein in triclad flatworms. Physiol. Zool.4, 515–541.
Metschnikoff, E., 1901: L'immunite dans les maladies infectienses. Paris. (English translation by F. G.Binnie, 1905, Immunity in infective diseases. Cambridge University Press.
Novikoff, A. B., 1963: Lysosomes in the physiology and pathology of cells. Contributions of staining methods. In: Ciba symposium on lysosomes (A. V. S. de Reuck, ed.), pp. 37–77. London: J. and A. Churchill.
—,E. Essner, andN. Quintana, 1964: The Golgi apparatus and lysosomes. Fed. Proc.23, 1010–1022.
—, andW. Y. Shin, 1964: The endoplasmic reticulum in the Golgi zone and its relations to microbodies, Golgi apparatus and autophagic vacuoles in rat liver cells. J. Microscopie3, 187.
Osborne, P. J., andA. T. Miller, 1962: Uptake and intracellular digestion of proteins (peroxidase) in planarians. Biol. Bull.123, 589–596.
— —, 1963: Acid and Alkaline phosphatase changes associated with feeding, starvation and regeneration in planarians. Biol. Bull.124, 285–292.
Padawer, J., 1969: Uptake of colloidal thorium dioxide by mast cells. J. Cell Biol.40, 747–760.
Pedersen, K. J., 1961: Some observations on the fine structure of planarian protonephridia and gastrodermal phagocytes. Z. Zellforsch.53, 609–628.
Rose, C., andS. Shostak, 1968: The transformation of gastrodermal cells to neoblasts in regeneratingPhagocata gracilis (Leidy). Exp. Cell Res.50, 553–561.
Rosenbaum, R. M., andC. I. Rolon, 1960: Intracellular digestion and hydrolytic enzymes in the phagocytes of planarians. Biol. Bull.118, 315–323.
Saint-Hilaire, C., 1910: Beobachtungen über die intracellulare Verdauung in den Darmzellen der Planarien. Z. allg. Physiol.11, 177–248.
Straus, W., 1964: Cytochemical observations on the relationship between lysosomes and phagosomes in kidney and liver by combined staining for acid phosphatase and intravenously injected horse radish peroxidase. J. Cell Biol.20, 497–507.
—, 1966: Changes in intracellular location of small phagosomes (micropinocytic vesicles) in kidney and liver cells in relation to time after injection and dose of horseradish peroxidase. J. Histochem. Cytochem.15, 381–393.
—, 1967: Lysosomes, phagosomes and related particles. In: Enzyme cytology (D. B. Roodyn, ed.), pp. 239–319. London and New York: Academic Press.
Swift, H., andZ. Hruban, 1964: Focal degradation as a biological process. Fed. Proc.23, 1026–1037.
Willier, B. H., L. H. Hyman, andS. A. Rifenburgh, 1925: A histochemical study of intracellular digestion in triclad flatworms. J. Morph. and Physiol.40, 299–340.
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This research was supported by the Scientific Research Council Grant No. B/RG/086.
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Bowen, I.D., Ryder, T.A. & Thompson, J.A. The fine structure of the planarianPolycelis tenuis Iijima. Protoplasma 79, 1–17 (1974). https://doi.org/10.1007/BF02055779
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DOI: https://doi.org/10.1007/BF02055779