Document Detail

Development of Schistosoma mansoni worms in mice analyzed by bright field and confocal microscopy.
MedLine Citation:
PMID:  17308779     Owner:  NLM     Status:  MEDLINE    
The blood flukes of mammals (Digenea: Schistosomatidae) are among trematodes unique whose adult worms have separated sexes which are dissimilar in appearance. The developmental features, growth and organogenesis of Schistosoma mansoni were studied in Swiss Webster mice by a digital system for image analysis and confocal microscopy. Data so far obtained showed two phases with significative morphological changes at 3-4 weeks post-infection, and a gradual similar development onwards in the reproductive system and tegument. Our male-dependent phase demonstrated that mating occurs before sexual maturing. At week three, the majority of male worms (59%) had formed the gynaecophoric canal although testicular lobes and tegumental tubercles were absent. By this time, 33% females had an incipient ovary (without cellular differentiation). At week four, 77.2% males presented testicular lobes with few germinative cells while 26% had developing tegumental tubercles. The immature ovary was observed in 69% females. Suckers followed different pattern of growth between male and females. The size of oral and ventral suckers from six-week-old male worms grew abruptly (3.0 fold) more than that of three-week-old. In female worms, maximum growth was attained at week four, reducing in size thereafter. From sixth week onwards, all specimens showed the fully developed reproductive system. Probably, these features are morphological traits which schistosome has experienced from hermaphrodite to dioecy.
Carla de Lamare Biolchini; Renata Heisler Neves; Maarten Hulstijn; Delir Corrêa Gomes; José Roberto Machado-Silva
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Memórias do Instituto Oswaldo Cruz     Volume:  101 Suppl 1     ISSN:  0074-0276     ISO Abbreviation:  Mem. Inst. Oswaldo Cruz     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2007-02-19     Completed Date:  2008-02-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7502619     Medline TA:  Mem Inst Oswaldo Cruz     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  261-5     Citation Subset:  IM    
Laboratório Romero Lascasas Porto, Departamento de Patologia e Laboratórios, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rua Prof. Manuel de Abreu 444, 20550-170 Rio de Janeiro, RJ, Brazil.
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MeSH Terms
Gonads / growth & development*
Microscopy, Confocal
Schistosoma mansoni / cytology,  growth & development*
Sexual Maturation*
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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