Inhibition of Amebic Lysosomal Acidification Blocks Amebic Trogocytosis and Cell Killing
Entamoeba histolytica ingests fragments of live host cells in a nibbling-like process termed amebic trogocytosis. Amebic trogocytosis is required for cell killing and contributes to tissue invasion, which is a hallmark of invasive amebic colitis. Work done prior to the discovery of amebic trogocytos...
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American Society for Microbiology
2017-08-01
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doaj-5b637d667b924e06bbd36a29d05d3c172021-07-02T05:33:16ZengAmerican Society for MicrobiologymBio2150-75112017-08-0184e01187-1710.1128/mBio.01187-17Inhibition of Amebic Lysosomal Acidification Blocks Amebic Trogocytosis and Cell KillingAllissia A. GilmartinKatherine S. RalstonWilliam A. PetriPatricia J. JohnsonEntamoeba histolytica ingests fragments of live host cells in a nibbling-like process termed amebic trogocytosis. Amebic trogocytosis is required for cell killing and contributes to tissue invasion, which is a hallmark of invasive amebic colitis. Work done prior to the discovery of amebic trogocytosis showed that acid vesicles are required for amebic cytotoxicity. In the present study, we show that acidified lysosomes are required for amebic trogocytosis and cell killing. Interference with lysosome acidification using ammonium chloride, a weak base, or concanamycin A, a vacuolar H+ ATPase inhibitor, decreased amebic trogocytosis and amebic cytotoxicity. Our data suggest that the inhibitors do not impair the ingestion of an initial fragment but rather block continued trogocytosis and the ingestion of multiple fragments. The acidification inhibitors also decreased phagocytosis, but not fluid-phase endocytosis. These data suggest that amebic lysosomes play a crucial role in amebic trogocytosis, phagocytosis, and cell killing.http://mbio.asm.org/cgi/content/full/8/4/e01187-17 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Allissia A. Gilmartin Katherine S. Ralston William A. Petri Patricia J. Johnson |
spellingShingle |
Allissia A. Gilmartin Katherine S. Ralston William A. Petri Patricia J. Johnson Inhibition of Amebic Lysosomal Acidification Blocks Amebic Trogocytosis and Cell Killing mBio |
author_facet |
Allissia A. Gilmartin Katherine S. Ralston William A. Petri Patricia J. Johnson |
author_sort |
Allissia A. Gilmartin |
title |
Inhibition of Amebic Lysosomal Acidification Blocks Amebic Trogocytosis and Cell Killing |
title_short |
Inhibition of Amebic Lysosomal Acidification Blocks Amebic Trogocytosis and Cell Killing |
title_full |
Inhibition of Amebic Lysosomal Acidification Blocks Amebic Trogocytosis and Cell Killing |
title_fullStr |
Inhibition of Amebic Lysosomal Acidification Blocks Amebic Trogocytosis and Cell Killing |
title_full_unstemmed |
Inhibition of Amebic Lysosomal Acidification Blocks Amebic Trogocytosis and Cell Killing |
title_sort |
inhibition of amebic lysosomal acidification blocks amebic trogocytosis and cell killing |
publisher |
American Society for Microbiology |
series |
mBio |
issn |
2150-7511 |
publishDate |
2017-08-01 |
description |
Entamoeba histolytica ingests fragments of live host cells in a nibbling-like process termed amebic trogocytosis. Amebic trogocytosis is required for cell killing and contributes to tissue invasion, which is a hallmark of invasive amebic colitis. Work done prior to the discovery of amebic trogocytosis showed that acid vesicles are required for amebic cytotoxicity. In the present study, we show that acidified lysosomes are required for amebic trogocytosis and cell killing. Interference with lysosome acidification using ammonium chloride, a weak base, or concanamycin A, a vacuolar H+ ATPase inhibitor, decreased amebic trogocytosis and amebic cytotoxicity. Our data suggest that the inhibitors do not impair the ingestion of an initial fragment but rather block continued trogocytosis and the ingestion of multiple fragments. The acidification inhibitors also decreased phagocytosis, but not fluid-phase endocytosis. These data suggest that amebic lysosomes play a crucial role in amebic trogocytosis, phagocytosis, and cell killing. |
url |
http://mbio.asm.org/cgi/content/full/8/4/e01187-17 |
work_keys_str_mv |
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