Document Detail

An ultrastructural study of reproduction in the sporocysts of Prosorhynchoides gracilescens (Digenea: Bucephalidae).
MedLine Citation:
PMID:  17235547     Owner:  NLM     Status:  MEDLINE    
The germinal development in Prosorhynchoides gracilescens sporocysts was studied using electron microscopy. The germinal cells proliferated and developed within multiple floating germinal masses located in the terminal portions of sporocyst branches. The germinal masses were composed of supporting and germinal cells. Supporting cells possessed numerous flattened extensions that spread around and between developing germinal cells to form three-dimensional mesh network, which maintained the integrity of the germinal mass. Morphological evidences of close interactions between supporting and germinal cells were numerous gap junctions between the two cell types and phagocytosis of small fragments of germinal cells cytoplasm by supporting cells. The germinal cells displayed structural differences that seemed to reflect their sequential developmental changes. These changes included (1) cell growth and increase of organelles number, (2) dispersion of nuclear chromatin and increase of nucleolus size, (3) polarization of the cell, (4) appearance of specific structures such as nuage and laminated inclusions. The germinal cells left the germinal masses to finish their differentiation in the body cavity and then cleaved to give rise to cercarial embryos. Ultrastructural features of the germinal elements of P. gracilescens sporocysts are discussed in the light of existing controversy concerning the nature of the germinal sacs reproduction.
I M Podvyaznaya
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-01-19
Journal Detail:
Title:  Parasitology research     Volume:  101     ISSN:  0932-0113     ISO Abbreviation:  Parasitol. Res.     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-04-26     Completed Date:  2007-08-29     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8703571     Medline TA:  Parasitol Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  35-42     Citation Subset:  IM    
The Laboratory of Parasitic Worms, Zoological Institute of the Russian Academy of Sciences, Universitetskaya nab., 1, St. Petersburg, 199034, Russia.
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MeSH Terms
Bivalvia / parasitology
Host-Parasite Interactions
Oocysts / ultrastructure*
Reproduction / physiology
Trematoda / physiology*

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