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Symbiotic Amebae in Human Intestines. Entamoeba histolytica Entamoeba dispar Entamoeba coli Entamoeba hartmanni Endolimax nana Iodamoeba bütschlii Dientamoeba fragilis * Blastocystis hominis **. Entamoeba histolytica. cysts 12-15 m m 4 nuclei (mature) blunt chromatoid bodies

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Symbiotic Amebae in Human Intestines


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slide1

Symbiotic Amebae in Human Intestines

Entamoeba histolytica

Entamoeba dispar

Entamoeba coli

Entamoeba hartmanni

Endolimax nana

Iodamoeba bütschlii

Dientamoeba fragilis*

Blastocystis hominis**

slide2

Entamoeba histolytica

  • cysts
    • 12-15 mm
    • 4 nuclei (mature)
    • blunt chromatoid bodies
  • trophozoites
    • 15-20 mm
    • extended pseudopodia
    • progressive movement
  • nuclear structure
    • peripheral chromatin
    • small karyosome

= E. dispar

slide3

Entamoeba histolytica

  • cysts
    • 12-15 mm
    • 4 nuclei (mature)
    • blunt chromatoid bodies
  • trophozoites
    • 15-20 mm
    • extended pseudopodia
    • progressive movement
    • >20 mm (invasive)
    • ( hematophagous)
  • nuclear structure
    • peripheral chromatin
    • small karyosome
slide4

Entamoeba hartmanni

  • cysts
    • 6-8 mm
    • 4 nuclei (mature)
    • blunt chromatoid bodies
    • CB persist in mature cysts
  • trophozoites
    • 8-10 mm
  • nuclear structure
    • peripheral chromatin
    • small karyosome
  • < 10 mm = E. hartmanni
  • > 10 mm = E. histolytica
  • ‘small race’ of E. histolytica
  • designated species in 1957
slide5

Entamoeba coli

  • cysts
    • 15-25 mm
    • 8 nuclei (mature)
    • pointed chromatoid bodies (less prominent)
  • trophozoites
    • 20-25 mm
    • broad blunt pseudopodia
  • nuclear structure
    • peripheral chromatin
    • small karyosome
slide6

Entamoeba coli

  • cysts
    • 15-25 mm
    • 8 nuclei (mature)
    • pointed chromatoid bodies (less prominent)
  • trophozoites
    • 20-25 mm
    • broad blunt pseudopodia
  • nuclear structure
    • peripheral chromatin
    • small karyosome
slide7

Entamoeba coli

  • cysts
    • 15-25 mm
    • 8 nuclei (mature)
    • pointed chromatoid bodies (less prominent)
  • trophozoites
    • 20-25 mm
    • broad blunt pseudopodia
  • nuclear structure
    • peripheral chromatin
    • small karyosome
    • irregular peripheral chromatin?
    • eccentric karyosome?
slide8

Other Entamoeba

  • E. gingivalis
  • oral cavity
  • no cyst stage
  • trophozoites nearly identical to E. histolytica
  • periodontal disease?
  • E. polecki
  • rarely found in humans
  • commensal of pigs & monkeys
  • cyst has one nucleus
  • E. moshkovskii
  • identical morphology as E. histolytica
  • free-living (sewerage)
  • cultured at 24o
slide9

Other Entamoeba

  • E. gingivalis
  • oral cavity
  • no cyst stage
  • trophozoites nearly identical to E. histolytica
  • periodontal disease?
  • E. polecki
  • rarely found in humans
  • commensal of pigs & monkeys
  • mature cyst has one nucleus
  • E. moshkovskii
  • identical morphology as E. histolytica
  • free-living (sewerage)
  • cultured at 24o
ali et al 2003 eid may issue
Ali et al, 2003, EID (May issue)
  • 109 stool samples from school children in Bangladesh analyzed by PCR
  • 16% positive of E. histolytica
  • 36% positive for E. dispar
  • 21% positive for E. moshkovskii
    • 74% of these co-infected with E.h. or E.d.
slide11

Endolimax nana

  • cysts
    • 6-8 mm
    • 4 nuclei
  • trophozoites
    • 8-10 mm
  • nuclear structure
    • no peripheral chromatin
    • large karyosome
slide12

Iodamoeba bütschlii

  • cysts
    • 10-12 mm
    • 1 nucleus
    • glycogen vacuole
  • trophozoites
    • 12-15 mm
  • nuclear structure
    • no peripheral chromatin
    • large karyosome
slide13

Iodamoeba bütschlii

  • cysts
    • 10-12 mm
    • 1 nucleus
    • glycogen vacuole
  • trophozoites
    • 12-15 mm
  • nuclear structure
    • no peripheral chromatin
    • large karyosome
slide14

Dientamoeba fragilis

  • no cyst stage
  • trophozoites
    • 9-12 mm
    • often binucleated
  • nuclear structure
    • no peripheral chromatin
    • fragmented karyosome
  • related to trichomonads
  • no flagella (basal bodies)
  • 15-30% of infections associated with diarrhea
slide17

Blastocystis hominis

  • life cycle unknown
  • cysts?
    • 5-30 mm
    • granules (nuclei), especially at periphery
    • large vacuole
  • previously called yeast, ameba, sporozoan, etc
  • 16S rRNA = stramenopile
  • stramenopiles include brown algae, diatoms, etc.
  • pathology debated
    • GI symptoms
    • strain variations