Mechanisms of microsporidial cell division: ultrastructural study on Encephalitozoon hellem

J Eukaryot Microbiol. May-Jun 1998;45(3):347-51. doi: 10.1111/j.1550-7408.1998.tb04547.x.


The mitotic process in microsporidian Encephalitozoon hellem, a known human pathogen, has been studied with the aim of elucidating some ultrastructural aspects of its nuclear division. The presence of a nuclear spindle, of "electrondense spindle plaques" associated with the nuclear envelope and of cytoplasmic double walled vesicles are reported. We suggest that these "electrondense spindle plaques" serve as foci for intranuclear and cytoplasmic microtubule arrangements, similar to the microtubule organizing centers within the centrosomes of animal cells. The extent to which the microsporidial division process is comparable with that of more familiar eukaryotes such as yeast cells is discussed.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • AIDS-Related Opportunistic Infections / parasitology*
  • Animals
  • Encephalitozoon / growth & development
  • Encephalitozoon / ultrastructure*
  • Encephalitozoonosis / parasitology*
  • Humans
  • Microscopy, Electron
  • Microtubules / ultrastructure
  • Mitosis*
  • Nuclear Envelope / ultrastructure
  • Spindle Apparatus / ultrastructure