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Fixation of microsporidian spores for electron microscopy

J I Ronny Larsson1

  • 1Department of Cell and Organism Biology, University of Lund, Helgonavagen 3, S-223 62 Lund, Sweden. ronny.larsson@cob.lu.se

Journal of Invertebrate Pathology
|August 23, 2005
PubMed

Insights

Fixation methods for Nosema spores were evaluated. Paraformaldehyde and formaldehyde proved effective, with higher temperatures improving fixation for terrestrial host spores, and freezing preserved spore cytology.

Area of Science:

  • Microbiology
  • Parasitology
  • Cell Biology

Background:

  • Nosema species are important microsporidian parasites affecting various hosts.
  • Effective fixation of spores is crucial for accurate microscopic examination and research.
  • Previous fixation protocols may not be optimal for all Nosema species or sample types.

Purpose of the Study:

  • To compare the efficacy of different fixatives and conditions for Nosema apis and Nosema bombi spores.
  • To determine the impact of temperature and freezing on spore fixation quality.
  • To identify optimal fixation parameters for reliable cytological studies.

Main Methods:

  • Spores of Nosema apis and Nosema bombi (fresh and frozen) were subjected to fixation.
  • Various fixatives including paraformaldehyde, technical formaldehyde, and glutaraldehyde were tested.
  • Fixation was performed at different temperatures and time points.
  • The cytology of fixed spores was examined microscopically.

Main Results:

  • Paraformaldehyde and technical formaldehyde yielded fixation results comparable or superior to glutaraldehyde.
  • Increased fixation temperatures enhanced the quality of spore fixation, particularly for terrestrial host-derived spores.
  • Freezing of spores did not compromise their cellular structure or cytology.

Conclusions:

  • Paraformaldehyde and technical formaldehyde are effective alternatives to glutaraldehyde for Nosema spore fixation.
  • Optimizing fixation temperature is important for achieving high-quality results with spores from terrestrial hosts.
  • Freezing is a viable method for preserving Nosema spores for subsequent cytological analysis, without loss of structural integrity.

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