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Strong type 1, but impaired type 2, immune responses contribute to Orientia tsutsugamushi-induced pathology in mice.
[scrub typhus]
Scrub
typhus
is
a
neglected
,
but
important
,
tropical
disease
,
which
puts
one
-
third
of
the
world
's
population
at
risk
.
The
disease
is
caused
by
Orientia
tsutsugamushi
,
an
obligately
intracellular
Gram
-negative
bacterium
.
Dysregulation
in
immune
responses
is
known
to
contribute
to
disease
pathogenesis
;
however
,
the
nature
and
molecular
basis
of
immune
alterations
are
poorly
defined
.
This
study
made
use
of
a
newly
developed
murine
model
of
severe
scrub
typhus
and
focused
on
innate
regulators
and
vascular
growth
factors
in
O
.
tsutsugamushi-infected
liver
,
lungs
and
spleen
.
We
found
no
activation
or
even
reduction
in
base-line
expression
for
multiple
molecules
(
IL
-
7
,
IL
-
4
,
IL
-
13
,
GATA
3
,
ROR-γt
,
and
CXCL
12
)
at
2
,
6
and
10
days
post-infection
.
This
selective
impairment
in
type
2
-
related
immune
responses
correlated
with
a
significant
activation
of
the
genes
for
IL
-
1
β
,
IL
-
6
,
IL
-
10
,
TNF
-α
,
IFN-γ
,
as
well
as
CXCR
3
-
and
CXCR
1
-
related
chemokines
in
inflamed
tissues
.
The
elevated
angiopoietin
(
Ang
)
-
2
expression
and
Ang-
2
/
Ang-
1
ratios
suggested
excessive
inflammation
and
the
loss
of
endothelial
integrity
.
These
alterations
,
together
with
extensive
recruitment
of
myeloperoxidase
(
MPO
)
-
expressing
neutrophils
and
the
influx
of
CD
3
+
T
cells
,
contributed
to
acute
tissue
damage
and
animal
death
.
This
is
the
first
report
of
selective
alterations
in
a
panel
of
immune
regulators
during
early
O
.
tsutsugamushi
infection
in
intravenously
inoculated
C
5
7
BL
/
6
mice
.
Our
findings
shed
new
light
on
the
pathogenic
mechanisms
associated
with
severe
scrub
typhus
and
suggest
potential
targets
for
therapeutic
investigation
.
Diseases
Validation
Diseases presenting
"developed murine model of severe scrub"
symptom
scrub typhus
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