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2016 ; 84
(4
): 1045-1053
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Knockdown of Five Genes Encoding Uncharacterized Proteins Inhibits Entamoeba
histolytica Phagocytosis of Dead Host Cells
#MMPMID26810036
Sateriale A
; Miller P
; Huston CD
Infect Immun
2016[Apr]; 84
(4
): 1045-1053
PMID26810036
show ga
Entamoeba histolytica is the protozoan parasite that causes invasive amebiasis,
which is endemic to many developing countries and characterized by dysentery and
liver abscesses. The virulence of E. histolytica correlates with the degree of
host cell engulfment, or phagocytosis, and E. histolytica phagocytosis alters
amebic gene expression in a feed-forward manner that results in an increased
phagocytic ability. Here, we used a streamlined RNA interference screen to
silence the expression of 15 genes whose expression was upregulated in phagocytic
E. histolytica trophozoites to determine whether these genes actually function in
the phagocytic process. When five of these genes were silenced, amebic strains
with significant decreases in the ability to phagocytose apoptotic host cells
were produced. Phagocytosis of live host cells, however, was largely unchanged,
and the defects were surprisingly specific for phagocytosis. Two of the five
encoded proteins, which we named E. histolytica ILWEQ (EhILWEQ) and E.
histolytica BAR (EhBAR), were chosen for localization via SNAP tag labeling and
localized to the site of partially formed phagosomes. Therefore, both EhILWEQ and
EhBAR appear to contribute to E. histolytica virulence through their function in
phagocytosis, and the large proportion (5/15 [33%]) of gene-silenced strains with
a reduced ability to phagocytose host cells validates the previously published
microarray data set demonstrating feed-forward control of E. histolytica
phagocytosis. Finally, although only limited conclusions can be drawn from
studies using the virulence-deficient G3 Entamoeba strain, the relative
specificity of the defects induced for phagocytosis of apoptotic cells but not
healthy cells suggests that cell killing may play a rate-limiting role in the
process of Entamoeba histolytica host cell engulfment.