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http://dx.doi.org/10.3347/kjp.2008.46.4.217

Contact-Independent Cell Death of Human Microglial Cells due to Pathogenic Naegleria fowleri Trophozoites  

Kim, Jong-Hyun (Department of Microbiology, and Department of Molecular Science & Technology, Ajou University School of Medicine)
Kim, Dae-Sik (Department of Clinical Laboratory Science, Dongnam Health College)
Shin, Ho-Joon (Department of Microbiology, and Department of Molecular Science & Technology, Ajou University School of Medicine)
Publication Information
Parasites, Hosts and Diseases / v.46, no.4, 2008 , pp. 217-221 More about this Journal
Abstract
Free-living Naegleria fowleri leads to a fatal infection known as primary amebic meningoencephalitis in humans. Previously, the target cell death could be induced by phagocytic activity of N. fowleri as a contact-dependent mechanism. However, in this study we investigated the target cell death under a non-contact system using a tissue-culture insert. The human microglial cells, U87MG cells, co-cultured with N. fowleri trophozoites for 30 min in a non-contact system showed morphological changes such as the cell membrane destruction and a reduction in the number. By fluorescence-activated cell sorter (FACS) analysis, U87MG cells co-cultured with N. fowleri trophozoites in a non-contact system showed a significant increase of apoptotic cells (16%) in comparison with that of the control or N. fowleri lysate. When U87MG cells were co-cultured with N. fowleri trophozoites in a non-contact system for 30 min, 2 hr, and 4 hr, the cytotoxicity of amebae against target cells was 40.5, 44.2, and 45.6%, respectively. By contrast, the cytotoxicity of non-pathogenic N. gruberi trophozoites was 10.2, 12.4, and 13.2%, respectively. These results suggest that the molecules released from N. fowleri in a contact-independent manner as well as phagocytosis in a contact-dependent manner may induce the host cell death.
Keywords
Naegleria fowleri; cell death; cytotoxicity; microglial cells;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By Web Of Science : 3  (Related Records In Web of Science)
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