Article ; Online: Studies on the cyst stage of Naegleria fowleri in vivo and in vitro.
The Journal of eukaryotic microbiology
2022 Volume 69, Issue 2, Page(s) e12881
Abstract: Naegleria fowleri is a pathogenic, free-living amoeba that causes primary amebic meningoencephalitis (PAM), a highly fatal disease of the central nervous system. N. fowleri demonstrates three forms: the trophozoite, flagellate, and cyst. Most studies ... ...
Abstract | Naegleria fowleri is a pathogenic, free-living amoeba that causes primary amebic meningoencephalitis (PAM), a highly fatal disease of the central nervous system. N. fowleri demonstrates three forms: the trophozoite, flagellate, and cyst. Most studies have focused on the trophozoite limiting information on the cyst. The present study examined the ability of cysts to attach to, excyst into the trophozoite form, and destroy cell cultures. Additionally, the study assessed the ability of cysts to cause PAM in a murine model. The results demonstrated that exposure to cysts and transformation into trophozoites resulted in destruction of cell cultures. Specifically, the mixed glial cells exhibited an increase in lactate dehydrogenase (LDH) release compared with cells without cyst exposure. On day eight postexposure, there was a nearly fourfold increase in LDH. The cysts of N. fowleri were shown not to be infective in vivo in a murine model. The mediation of the encystment process by the intracellular concentration of cAMP was also investigated. Trophozoites were treated with dipyridamole, an inhibitor of cAMP-specific phosphodiesterases. Dipyridamole increased the rate of encystment by nearly twofold and increased the intracellular concentration of cAMP in cysts by nearly sixfold throughout this period suggesting that cAMP is a mediator of encystment for N. fowleri. |
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MeSH term(s) | Amebiasis ; Animals ; Central Nervous System Protozoal Infections ; Cysts ; Dipyridamole ; Disease Models, Animal ; Mice ; Naegleria fowleri/physiology ; Trophozoites |
Chemical Substances | Dipyridamole (64ALC7F90C) |
Language | English |
Publishing date | 2022-01-26 |
Publishing country | United States |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ZDB-ID | 1147218-2 |
ISSN | 1550-7408 ; 1066-5234 |
ISSN (online) | 1550-7408 |
ISSN | 1066-5234 |
DOI | 10.1111/jeu.12881 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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