Science Immunology,
Journal Year:
2023,
Volume and Issue:
8(81)
Published: March 17, 2023
IgE-mediated
anaphylaxis
is
an
acute
life-threatening
systemic
reaction
to
allergens,
including
certain
foods
and
venoms.
Anaphylaxis
triggered
when
blood-borne
allergens
activate
IgE-bound
perivascular
mast
cells
(MCs)
throughout
the
body,
causing
extensive
release
of
MC
mediators.
Through
precipitating
vasodilatation
vascular
leakage,
these
mediators
are
believed
trigger
a
sharp
drop
in
blood
pressure
humans
core
body
temperature
animals.
We
report
that
IgE/MC-mediated
mice
associated
with
also
requires
body’s
thermoregulatory
neural
circuit.
This
circuit
activated
granule-borne
chymase
from
MCs
deposited
on
proximal
TRPV1
+
sensory
neurons
stimulates
them
via
protease-activated
receptor-1.
triggers
activation
network,
which
rapidly
attenuates
brown
adipose
tissue
thermogenesis
cause
hypothermia.
Mice
deficient
either
or
exhibited
limited
anaphylaxis,
and,
wild-type
mice,
could
be
recapitulated
simply
by
systemically
activating
neurons.
Thus,
addition
their
well-known
effects
vasculature,
products,
especially
chymase,
promote
Science Translational Medicine,
Journal Year:
2022,
Volume and Issue:
14(632)
Published: Feb. 16, 2022
Nociceptors
are
specialized
sensory
neurons
that
detect
damaging
or
potentially
stimuli
and
found
in
the
dorsal
root
ganglia
(DRG)
trigeminal
ganglia.
These
critical
for
generation
of
neuronal
signals
ultimately
create
perception
pain.
also
primary
targets
treating
acute
chronic
Single-cell
transcriptomics
on
mouse
nociceptors
has
transformed
our
understanding
pain
mechanisms.
We
sought
to
generate
equivalent
information
human
with
goal
identifying
transcriptomic
signatures
nociceptors,
species
differences
potential
drug
targets.
used
spatial
molecularly
characterize
transcriptomes
single
DRG
from
eight
organ
donors.
identified
12
clusters
neurons,
5
which
C
as
well
1
low-threshold
mechanoreceptors
(LTMRs),
Aβ
nociceptor,
2
Aδ,
Aβ,
proprioceptor
subtypes.
By
focusing
expression
profiles
ion
channels,
G
protein-coupled
receptors
(GPCRs),
other
pharmacological
targets,
we
provided
a
rich
map
direct
comparison
neuron
transcriptomes.
compared
subtypes
nonhuman
primates
showing
conserved
patterns
gene
among
many
cell
types
but
divergence
specific
nociceptor
subsets.
Last,
sex
subpopulation
transcriptomes,
including
marked
increase
calcitonin-related
polypeptide
alpha
(CALCA)
female
pruritogen
receptor-enriched
nociceptors.
This
comprehensive
characterization
might
open
door
development
better
treatments
disorders.
Annual Review of Neuroscience,
Journal Year:
2021,
Volume and Issue:
44(1), P. 335 - 357
Published: March 26, 2021
The
large
number
of
ion
channels
found
in
all
nervous
systems
poses
fundamental
questions
concerning
how
the
characteristic
intrinsic
properties
single
neurons
are
determined
by
specific
subsets
they
express.
All
display
many
different
with
overlapping
voltage-
and
time-dependent
properties.
We
speculate
that
these
promote
resilience
neuronal
function.
Individual
same
cell
type
show
variability
channel
conductance
densities
even
though
can
generate
reliable
similar
behavior.
This
complicates
a
simple
assignment
function
to
any
is
associated
variable
responses
perturbations,
deletions,
pharmacological
manipulation.
Ion
genes
often
strong
positively
correlated
expression,
which
may
result
from
molecular
developmental
rules
determine
expressed
given
type.
Neuron,
Journal Year:
2021,
Volume and Issue:
109(17), P. 2691 - 2706.e5
Published: July 19, 2021
Although
sex
dimorphism
is
increasingly
recognized
as
an
important
factor
in
pain,
female-specific
pain
signaling
not
well
studied.
Here
we
report
that
administration
of
IL-23
produces
mechanical
(mechanical
allodynia)
female
but
male
mice,
and
chemotherapy-induced
selectively
impaired
mice
lacking
Il23
or
Il23r.
IL-23-induced
promoted
by
estrogen
suppressed
androgen,
suggesting
involvement
hormones.
requires
C-fiber
nociceptors
TRPV1
to
produce
does
directly
activate
nociceptor
neurons.
Notably,
IL-17A
release
from
macrophages
evoke
females.
Low-dose
activates
induces
only
Finally,
deletion
receptor
subunit
α
(ERα)
TRPV1+
abolishes
IL-23-
IL-17-induced
These
findings
demonstrate
the
IL-23/IL-17A/TRPV1
axis
regulates
via
neuro-immune
interactions.
Our
study
also
reveals
at
both
immune
neuronal
levels.
Nature,
Journal Year:
2022,
Volume and Issue:
607(7917), P. 104 - 110
Published: June 22, 2022
Itch
triggers
scratching,
a
behavioural
defence
mechanism
that
aids
in
the
removal
of
harmful
irritants
and
parasites1.
Chemical
itch
is
triggered
by
many
endogenous
exogenous
cues,
such
as
pro-inflammatory
histamine,
which
released
during
an
allergic
reaction1.
Mechanical
can
be
light
sensations
wool
fibres
or
crawling
insect2.
In
contrast
to
chemical
pathways,
have
been
extensively
studied,
mechanisms
underlie
transduction
mechanical
are
largely
unknown.
Here
we
show
mechanically
activated
ion
channel
PIEZO1
(ref.
3)
selectively
expressed
itch-specific
sensory
neurons
required
for
their
currents.
Loss
function
peripheral
greatly
reduces
evoked
scratching
behaviours
both
acute
chronic
itch-evoked
sensitization.
Finally,
mice
expressing
gain-of-function
Piezo1
allele4
exhibit
enhanced
behaviours.
Our
studies
reveal
polymodal
nature
identify
role
sensation
itch.