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2015 ; 5
(ä): 11046
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Suppression of cell division-associated genes by Helicobacter pylori attenuates
proliferation of RAW264 7 monocytic macrophage cells
#MMPMID26078204
Tan GM
; Looi CY
; Fernandez KC
; Vadivelu J
; Loke MF
; Wong WF
Sci Rep
2015[Jun]; 5
(ä): 11046
PMID26078204
show ga
Helicobacter pylori at multiplicity of infection (MOI ? 50) have been shown to
cause apoptosis in RAW264.7 monocytic macrophage cells. Because chronic gastric
infection by H. pylori results in the persistence of macrophages in the host's
gut, it is likely that H. pylori is present at low to moderate, rather than high
numbers in the infected host. At present, the effect of low-MOI H. pylori
infection on macrophage has not been fully elucidated. In this study, we
investigated the genome-wide transcriptional regulation of H. pylori-infected
RAW264.7 cells at MOI 1, 5 and 10 in the absence of cellular apoptosis.
Microarray data revealed up- and down-regulation of 1341 and 1591 genes,
respectively. The expression of genes encoding for DNA replication and cell
cycle-associated molecules, including Aurora-B kinase (AurkB) were
down-regulated. Immunoblot analysis verified the decreased expression of AurkB
and downstream phosphorylation of Cdk1 caused by H. pylori infection.
Consistently, we observed that H. pylori infection inhibited cell proliferation
and progression through the G1/S and G2/M checkpoints. In summary, we suggest
that H. pylori disrupts expression of cell cycle-associated genes, thereby
impeding proliferation of RAW264.7 cells, and such disruption may be an
immunoevasive strategy utilized by H. pylori.