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Related Experiment Videos

External eye flora as a nutrient source for Acanthamoeba.

D F Larkin1, D L Easty

  • 1University Department of Ophthalmology, Bristol Eye Hospital, United Kingdom.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|January 1, 1990
PubMed
Summary

Certain bacteria trigger Acanthamoeba excystment and migration. Researchers compared Acanthamoeba trophozoite migration speeds on various bacteria, finding equal speed on E. coli and S. epidermidis, suggesting a role in Acanthamoeba keratitis.

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Area of Science:

  • Microbiology
  • Ophthalmology
  • Parasitology

Background:

  • Acanthamoeba keratitis is a serious eye infection.
  • The role of bacteria in Acanthamoeba pathogenesis is not fully understood.
  • Commensal bacteria are present on the ocular surface.

Purpose of the Study:

  • To investigate the effect of commensal eye bacteria and Escherichia coli on Acanthamoeba excystment and trophozoite migration.
  • To compare the migration rates of Acanthamoeba trophozoites on different bacterial species.

Main Methods:

  • Acanthamoeba cysts were inoculated on agar plates seeded with specific bacteria.
  • Excystment rates were observed.
  • Trophozoite migration speeds were measured on different bacterial lawns.

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Main Results:

  • Acanthamoeba excysted on all tested bacteria, including Escherichia coli, Staphylococcus epidermidis, Micrococcus, and Corynebacterium.
  • Acanthamoeba trophozoites migrated at similar speeds on Escherichia coli and Staphylococcus epidermidis.
  • Slower migration was observed on Micrococcus and Corynebacterium.

Conclusions:

  • Commensal bacteria on the ocular surface can induce Acanthamoeba excystment.
  • Bacterial species influence the migration rate of Acanthamoeba trophozoites.
  • These findings suggest a potential role for commensal bacteria in the pathogenesis of Acanthamoeba keratitis.