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Presentation by scanning electron microscopy of the life cycle of microsporidia of the genus Encephalitozoon
- Source :
- Microbes and Infection. 2:1401-1406
- Publication Year :
- 2000
- Publisher :
- Elsevier BV, 2000.
-
Abstract
- This paper presents, for the first time, documentation by detailed scanning electron microscopy of the life cycle of microsporidia of the genus Encephalitozoon. Phase 1 is represented by the extracellular phase with mature spores liberated by the rupture of host cells. To infect new cells the spores have to discharge their polar filament. Spores with everted tubes show that these are helically coiled. When the polar tubules have started to penetrate into a host cell they are incomplete in length. The infection of a host cell can also be initiated by a phagocytic process of the extruded polar filament into an invagination channel of the host cell membrane. After the penetration process, the tube length is completed by polar tube protein which passes through the tube in the shape of swellings. A completely discharged polar tube with its tip is also shown. The end of a polar tube is normally hidden in the cytoplasm of the host cell. After completion of the tube length the transfer of the sporoplasm occurs and phase 2 starts. Phase 2 is the proliferative phase, or merogony, with the intracellular development of the parasite that cannot be documented by scanning electron microscopy. The subsequent intracellular phase 3, or sporogony, starts when the meronts transform into sporonts, documented as chain-like structures which subdivide into sporoblasts. The sporoblasts finally transform directly into spores which can be seen in their host cell, forming bubble-like swellings in the cell surface.
- Subjects :
- Spores
Host cell membrane
Life Cycle Stages
Sporoplasm
fungi
Immunology
Encephalitozoon
Biology
biology.organism_classification
Microbiology
Host-Parasite Interactions
Cell biology
Infectious Diseases
Cytoplasm
Chlorocebus aethiops
Microsporidia
Microscopy, Electron, Scanning
Polar tube
Ultrastructure
Animals
Polar filament
Vero Cells
Intracellular
Subjects
Details
- ISSN :
- 12864579
- Volume :
- 2
- Database :
- OpenAIRE
- Journal :
- Microbes and Infection
- Accession number :
- edsair.doi.dedup.....c3c9703d385de05b9a59808ecd05ccfa