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2016 ; 10
(3
): e0004505
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Hemophagocytosis in Experimental Visceral Leishmaniasis by Leishmania donovani
#MMPMID26942577
Morimoto A
; Omachi S
; Osada Y
; Chambers JK
; Uchida K
; Sanjoba C
; Matsumoto Y
; Goto Y
PLoS Negl Trop Dis
2016[Mar]; 10
(3
): e0004505
PMID26942577
show ga
Hemophagocytosis is a phenomenon in which macrophages phagocytose blood cells.
There are reports on up-regulated hemophagocytosis in patients with infectious
diseases including typhoid fever, tuberculosis, influenza and visceral
leishmaniasis (VL). However, mechanisms of infection-associated hemophagocytosis
remained elusive due to a lack of appropriate animal models. Here, we have
established a mouse model of VL with hemophagocytosis. At 24 weeks after
infection with 1 x 10(7) Leishmania donovani promastigotes, BALB/cA mice
exhibited splenomegaly with an average tissue weight per body weight of 2.96%. In
the tissues, 28.6% of macrophages contained phagocytosed erythrocytes. All of the
hemophagocytosing macrophages were parasitized by L. donovani, and higher levels
of hemophagocytosis was observed in heavily infected cells. Furthermore, more
than half of these hemophagocytes had two or more macrophage-derived nuclei,
whereas only 15.0% of splenic macrophages were bi- or multi-nuclear. These
results suggest that direct infection by L. donovani causes hyper-activation of
host macrophages to engulf blood cells. To our knowledge, this is the first
report on hemophagocytosis in experimental Leishmania infections and may be
useful for further understanding of the pathogenesis.