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Echinococcus granulosus: changes in the surface ultrastructure during protoscolex formation

  • M. T. Rogan (a1) and K. Sylvia Richards (a1)

Summary

Changes in the tegumentary projections of protoscoleces of Echinococcus granulosus, developing within brood capsules, were examined at the ultrastructural level. The original scant covering of spineless, truncated microtriches was supplemented by a population of microvilli covering the entire surface of protoscoleces in the early stages of formation. As differentiation continued, rostellar hooks were formed by enlargement of single large (T 1) microtriches, and normal spined microtriches were produced on the sucker region. These were formed in two ways: by addition of spine material to the truncated microtriches, and de novo followed by up-lifting from the tegumentary surface. A second type of large microthrix (T2) was present in a band immediately below the developing hooks. These microtriches appeared to be formed from a fusion of existing microtriches, but were subsequently lost prior to scolex invagination. The microvilli were also shed from both the sucker and soma regions, to be replaced by microtriches and small blunt elevations respectively.

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Bilqees, F. M. & Freeman, R. S. (1969). Histogenesis of the rostellum of Taenia crassiceps (Zeder, 1800) (Cestoda), with special reference to hook development. Canadian Journal of Zoology 47, 251–61.
Bortoletti, G. & Ferretti, G. (1973). Investigation on larval forms of Echinococcus granulosus with electron microscope. Rivista di Parassitologia 34, 89110.
Conder, G. A., Marchiondo, A. A., Williams, J. F. & Andersen, F. L. (1983). Freeze-etch characterization of the teguments of three metacestodes: Echinococcus granulosus, Taenia crassiceps, and Taenia taeniaeformis. Journal of Parasitology 69, 539–48.
Dew, H. R. (1922). Observations on the mode of development of brood capsules and scolices in the encysted stage of Taenia echinococcus. Medical Journal of Australia 2, 381–4.
Engelkirk, P. G. & Williams, J. F. (1983). Taenia taeniaeformis (Cestoda) in the rat: ultrastructure of the host–parasite interface on days 8 to 22 postinfection. Journal of Parasitology 69, 828–37.
Hess, E. (1980). Ultrastructural study of the tetrathyridium of Mesocestoides corti Hoeppli, 1925; tegument and parenchyma. Zeitschrift für Parasitenkunde 61, 135–59.
Hulínská, D. (1980). The morphogenesis of microtriches in the tegument of Taenia hydatigena throughout its larval development. Folia Parasitologica 27, 329–36.
Lopez-Campos, J. L., Linares, J., Alonso, J., Aneiros, J. & Diaz-Flores, L. (1978). Estudio de la capa laminada, membranas germinativas y tegumento del protoescolex del Echinococcus granulosus en su localizacion humana. Morfologia normal y patologia 2, 99109.
Lumsden, R. D. (1975). Surface ultrastructure and cytochemistry of parasitic helminths. Experimental Parasitology 37, 267339.
Lumsden, R. D., Oaks, J. A. & Mueller, J. F. (1974). Brush border development in the tegument of the tapeworm Spirometra mansonoides. Journal of Parasitology 60, 209–26.
Lumsden, R. D., Voge, M. & Sogandares-Bernal, F. (1982). The metacestode integument: fine structure, development, topochemistry, and interactions with the host. In Cysticercosis: Present State of Knowledge and Perspectives, (ed. Flisser, A., Willms, K., Laclette, J. P., Larralde, C., Ridaura, C. and Beltran, F.), pp. 307–61. New York and London: Academic Press.
MacKinnon, B. M. & Burt, M. D. B. (1982). Polymorphism of microtriches in the cysticercoid of Ophryocotyle insignis Lonnberg, 1890 from the limpet Patella vulgata. Canadian Journal of Zoology 61, 1062–70.
MacKinnon, B. M. & Burt, M. D. B. (1984). The development of the tegument and cercomer of the polycephalic larvae (cercoscolices) of Paricterotaeniaparadoxa (Rudolphi, 1802) (Cestoda: Dilepidae) at the ultrastructural level. Parasitology 88, 117–30.
McManus, D. D. & Barrett, N. J. (1985). Isolation, fractionation and partial characterization of the tegumental surface from protoscoleces of the hydatid orgnism, Echinococcus granulosus. Parasitology 90, 111–29.
Morseth, D. J. (1967). Fine structure of the hydatid cyst and protoscolex of Echinococcus granulosus. Journal of Parasitology 53, 312–25.
Mount, P. M. (1970). Histogenesis of the rostellar hooks of Taenia crassiceps (Zeder, 1800) (Cestoda). Journal of Parasitology 56, 947–61.
Pennoit-De Cooman, E. & De Rycke, P. H. (1972). Experimental secondary echinococcosis of Echinococcus granulosus. III. Observationson the morphogenesis of protoscolices. Biologishe Jaarboek Dodonaea 40, 276–87.
Richards, K. S. & Arme, C. (1984). Maturation of the scolex syncytium in the metacestode of Hymenolepis diminuta, with special reference to microthrix formation. Parasitology 88, 341–9.
Rogan, M. T. & Richards, K. S. (1986). In vitro development of hydatid cysts from posterior bladders and ruptured brood capsules of equine Echinococcus granulosus. Parasitology 92, 379–90.
Sakamoto, T. & Sugimura, M. (1970). Electron microscopical observations on histogenesis of larval Echinococcus multilocularis. Japanese Journal of Veterinary Research 18, 131–44.
Šlais, J. (1973). Functional morphology of cestode larvae. Advances in Parasitology 11, 395480.
Smyth, J. D. (1962). The biology of the hydatid organisms. Advances in Parasitology 2, 169219.
Thompson, R. C. A. (1976a). The development of brood capsules and protoscolices in secondary hydatid cysts of Echinococcus granulosus. Zeitschrift für Parasitenkunde 51, 31–6.
Thompson, R. C. A. (1976b). Developing protoscoleces of Echinococcus granulosus on the outer surface of the brood capsule, detected by scanning electron microscopy. Journal of Helminthology 50, 75–7.
Threadgold, L. T. (1984). Parasitic platyhelminths. In Biology of the Integument vol. 1 (ed. J., Bereiter-Hahn, Matoltsy, A. G. and Richards, K. S.), pp. 132–91. Berlin and Heidelberg: Springer–Verlag.
Timofeev, V. A. & Kuperman, B. I. (1972). Origin and formation of microtrichia in Cestoda exemplified on Triaenophorus nodulosus - an electron-optic study. Translated from Doklady Akademii Nauk SSSR 207, 757–9.
Ubelaker, J. E. (1983). Metacestodes: morphology and development. In Biology of the Eucestoda, vol. 1 (ed. Arme, C. and Pappas, P. W.), pp. 139–76. London: Academic Press.

Echinococcus granulosus: changes in the surface ultrastructure during protoscolex formation

  • M. T. Rogan (a1) and K. Sylvia Richards (a1)

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