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Entamoeba gingivalis
''Entamoeba gingivalis'' is an opportunistic protozoa (reported by some to cause disease)〔Lyons T. et al. "Oral amoebiasis: a new approach for the general practitionner in the diagnosis and the treatment of periodontal disease." in ''Oral Health'', 70: 39-41, 108, 110, October 1980.〕〔Lyons T. (Introduction to protozoa and fungi in periodontal disease. ) Trevor Lyons publications, Ontario, Canada 1989. ISBN 0-9693950-0-0〕 and is the first amoeba in humans to be described.
It is found in the mouth
inside the gingival pocket biofilm near the base of the teeth, and in periodontal pockets.〔Bonner, M., Amard, V., Bar-Pinatel, C., Charpentier, F., Chatard, J.-M., Desmuyck, Y., Ihler, S., Rochet, J.-P., Roux de La Tribouille, V., Saladin, L., Verdy, M., Gironès, N., Fresno, M. & Santi-Rocca, J. 2014: Detection of the amoeba ''Entamoeba gingivalis'' in periodontal pockets. Parasite, 21, 30. 〕 ''Entamoeba gingivalis'' is found in 95% of people with gum disease and rarely in people with healthy gums.〔Kofoid, C.A., Hinshaw, H.C., Johnsotne, H.G., Animal parasites of the mouth and their relation to dental disease. Journal of the American Dental Association 1434-1455, August 1929.〕〔Trim, Robert D.; Skinner, Michael A.; Farone, Mary B.; DuBois, John D.; Newsome, Anthony L. (2011) Use of PCR to detect Entamoeba gingivalis in diseased gingival pockets and demonstrate its absence in healthy gingival sites.〕 Cyst formation is not present; therefore transmission is direct from one person to another by kissing, or by sharing eating utensils. Only the trophozoites are formed and the size is usually 20 micrometers to 150 micrometers in diameter. ''Entamoeba gingivalis'' have pseudopodia that allow them to move quickly and phagocytise the nucleus of polynuclear neutrophils by exonucleophagy in periodontal disease.〔Bonner M. To Kiss or Not to Kiss. Amyris Editions, 2013 EAN : 978-28755-2016-6〕 Their spheroid nucleus is 2 micrometers to 4 micrometers in diameter and contains a small central endosome. There are numerous food vacuoles, which consists mostly of phagocitised PMN nucleus, blood cells and bacteria.
==Media==
The main activity of the amoeba ''Entamoeba gingivalis'' in the infected periodontal crevices, besides moving, consists in feeding on the nucleus of white blood cells. The amoeba penetrates into the cytoplasm to reach the nucleus and literally suctions its contents via the negative pressure of the pseudopod. The food so gulped down is gradually digested inside the endoplasm. Phagocytosis can sometimes continue for more than 20 polynuclear neutrophil nuclei. This activity leaves a denucleated cell, unable to achieve either its NETS activity or its preprogrammed apoptosis. It will release PMN-uncontrolled proteolytic enzymes on surrounding tissues and could be considered a pathogen from this vampirising activity.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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