Issue |
Parasite
Volume 5, Number 3, September 1998
|
|
---|---|---|
Page(s) | 247 - 254 | |
DOI | https://doi.org/10.1051/parasite/1998053247 | |
Published online | 19 September 2014 |
Mémoire
Some ultrastructural data on Microsporidium ceylonensis, a cause of corneal microsporidiosis
Quelques données ultrastructurales concernant Microsporidium ceylonensis, responsable de microsporidiose cornéenne
1
Department of Biology, Imperial College of Science, Technology & Medicine, London SW7 2AZ, UK.
2
Public Health Laboratory, Withington Hospital, Manchester M20 2LR, UK.
3
Department of Parasitology, Charles University, Viničná 7, 12844 Prague 2, Czech Republic.
4
Departments of Ophthalmology & Pathological Sciences, University of Manchester, Manchester M13 9PT, UK.
Received:
31
January
1998
Accepted:
6
April
1998
Sections of corneal tissue infected with Microsporidium ceylonensis were restained or processed for electron microscopy. Confirmation was obtained that the parasite develops in macrophages and that spores are uninucleate. New information is provided that sporoblasts and spores develop synchronously within a membrane in the host cell, spores have an anisofilar polar tube of 6-10 wide coils and 2-3 narrow coils and details are given of the spore wall and internal organisation. The parasite was compared on the one hand with Encephalitozoon, which exhibits asynchronous intravacuolar development of merogonic and sporogonic stages and has spores with isofilar polar tubes and on the other hand with species reported from mammals, of which the sporogonic stages develop synchronously within sporophorous vesicles and the spores have anisofilar polar tubes. Even so, a generic emplacement could not be established. Attention is drawn to the similarities between M. ceylonensis and Nosemo sp. described from the cornea of a woman in Botswana.
Résumé
Des coupes de tissu cornéen infecté par Microsporidium ceylonensis sont colorées ou examinées en microscopie électronique. Il se confirme que le parasite se développe dans les macrophages et que les spores sont uninucléés. En outre, il apparaît que les sporoblastes et les spores se développent dans les macrophages à l'intérieur de vacuoles parasitophores, les spores ont un tubule polaire anisofilaire avec 6 à 10 larges spires et 2 ou 3 spires étroites. La paroi des spores et leur organisation interne est détaillée. Le parasite est comparé d'une part avec Encephalitozoon, Endoreticulatus et Cytosporogenes, genres dont le développement est intravacuolaire, et d'autre part avec certaines espèces retrouvées chez les mammifères, qui présentent des tubules polaires anisofilaires. Cependant, leur appartenance générique n'a pu être établie. Les auteurs soulignent les similitudes existant entre M. ceylonensis et Nosema sp., décrites dans la cornée d'une femme au Botswana.
Key words: Microsporidium ceylonensis / human corneal microsporidiosis / ultrastructure / macrophages / anisofilar polar tube
Mots clés : Microsporidium ceylonensis / microsporidiose de la cornée humaine / ultrastructure / macrophages / tubule polaire anisofilaire
© PRINCEPS Editions, Paris, 1998, transferred to Société Française de Parasitologie
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