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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
immunology and microbiology
Ultrastructure and cytochemistry of vitellogenesis in Wenyonia virilis Woodland, 1923 (Cestoda, Caryophyllidea)
Acta Parasitologica, Volume 54, No. 2, Year 2009
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Description
Vitellogenesis in Wenyonia virilis was examined by transmission electron microscopy (TEM), including the cytochemical detection of glycogen at the ultrastructural level with the periodic acid-thiosemicarbazide-silver proteinate (PA-TSC-SP) technique. Mature vitelline follicles have cells in various stages of development, progressing from immature cells of gonial type near the periphery of the follicle to maturing and mature vitellocytes towards the centre. Maturation is characterized by: (1) increase in cell volume; (2) increase in nuclear surface area restoring the N/C (nucleo-cytoplasmic) ratio; (3) nucleolar transformation; (4) extensive development of parallel cisternae of GER, the shell-protein producing units; (5) development of Golgi complexes, engaged in shell-granule/shell-globule formation and packaging; (6) synthesis and storage of glycogen in the cytoplasm; (7) simultaneous, independent formation and storage of intranuclear glycogen; (8) continuous fusion of small shell-granules into larger shell-globules and fusion of these into large shell-globule clusters with a progressive increase in the number and size of the latter; and (9) disintegration of GER in the medial layer of vitellocyte cytoplasm, degenerative changes and accumulation of glycogen and shell-globule clusters within the cytoplasm. The functional significance of numerous shell-globule clusters and the relatively small amount of nuclear and cytoplasmic glycogen is analysed. Unlike vitellogenesis of other caryophyllids, the nuclear glycogen of mature vitellocytes in W. virilis is randomly dispersed in the nucleoplasm and never forms a high central accumulation, the so-called "nuclear vacuole". The nutritive function of vitellocytes appears greatly reduced in W. virilis, a fact perhaps related to the intrauterine development of the early embryos. The ultrastructure of vitellogenesis in W. virilis is compared with that in other lower cestodes, both monozoic and polyzoic. Conclusions concerning interrelationships of the vitellogenesis pattern of the ultrastructural cytochemistry of mature vitellocytes of W. virilis to intrauterine embryonation, absence of uterine glands and an extensive uterus characteristic for this species, are drawn and discussed. © 2009 Versita Warsaw and Springer-Verlag Berlin Heidelberg.
Authors & Co-Authors
Świderski, Zdzisław P.
Poland, Warsaw
Witold Stefański Institute of Parasitology of the Polish Academy of Sciences
Poland, Warsaw
Medical University of Warsaw
Mlocicki, Daniel
Poland, Warsaw
Witold Stefański Institute of Parasitology of the Polish Academy of Sciences
Poland, Warsaw
Medical University of Warsaw
MacKiewicz, John S.
United States, Albany
State University of new York Albany
Miquel, Jordi
Spain, Barcelona
Universitat de Barcelona
Ibraheem, Mohammed Hasan
Egypt, Minya
Faculty of Science
Bruňanská, Magdaléna
Slovakia, Bratislava
Slovak Academy of Sciences
Statistics
Citations: 25
Authors: 6
Affiliations: 6
Identifiers
Doi:
10.2478/s11686-009-0028-0
ISSN:
12302821
Research Areas
Cancer