Frontiers in Neuroscience,
Journal Year:
2021,
Volume and Issue:
15
Published: Sept. 24, 2021
Microglia
are
the
resident
macrophages
of
central
nervous
system
(CNS)
acting
as
first
line
defense
in
brain
by
phagocytosing
harmful
pathogens
and
cellular
debris.
emerge
from
early
erythromyeloid
progenitors
yolk
sac
enter
developing
before
establishment
a
fully
mature
blood–brain
barrier.
In
physiological
conditions,
during
development,
microglia
contribute
to
CNS
homeostasis
supporting
cell
proliferation
neural
precursors.
post-natal
life,
such
cells
preserving
integrity
neuronal
circuits
sculpting
synapses.
After
injury,
change
their
morphology
down-regulate
those
genes
homeostatic
functions.
However,
it
is
still
unclear
whether
changes
accompanied
molecular
functional
modifications
that
might
pathological
process.
While
comprehensive
transcriptome
analyses
at
single-cell
level
have
identified
specific
gene
perturbations
occurring
“pathological”
microglia,
precise
protective/detrimental
role
neurological
disorders
far
being
elucidated.
this
review,
results
so
obtained
regarding
neurodegenerative
will
be
discussed.
There
solid
sound
evidence
suggesting
regulating
functions
disease
pathology
represent
strategy
develop
future
therapies
aimed
counteracting
degeneration
multiple
sclerosis,
Alzheimer’s
disease,
Parkinson’s
amyotrophic
lateral
sclerosis.
Nature Neuroscience,
Journal Year:
2022,
Volume and Issue:
25(5), P. 588 - 595
Published: May 1, 2022
Abstract
The
loss
of
dopamine
(DA)
neurons
within
the
substantia
nigra
pars
compacta
(SNpc)
is
a
defining
pathological
hallmark
Parkinson’s
disease
(PD).
Nevertheless,
molecular
features
associated
with
DA
neuron
vulnerability
have
not
yet
been
fully
identified.
Here,
we
developed
protocol
to
enrich
and
transcriptionally
profile
from
patients
PD
matched
controls,
sampling
total
387,483
nuclei,
including
22,048
profiles.
We
identified
ten
populations
spatially
localized
each
SNpc
using
Slide-seq.
A
single
subtype,
marked
by
expression
gene
AGTR1
confined
ventral
tier
SNpc,
was
highly
susceptible
in
showed
strongest
upregulation
targets
TP53
NR2F2
,
nominating
processes
degeneration.
This
same
vulnerable
population
specifically
enriched
for
heritable
risk
PD,
highlighting
importance
cell-intrinsic
determining
differential
PD-associated
Brain,
Journal Year:
2021,
Volume and Issue:
145(3), P. 964 - 978
Published: Dec. 13, 2021
Idiopathic
Parkinson's
disease
is
characterized
by
a
progressive
loss
of
dopaminergic
neurons,
but
the
exact
aetiology
remains
largely
unknown.
To
date,
research
has
mainly
focused
on
nigral
although
recent
studies
suggest
disease-related
changes
also
in
non-neuronal
cells
and
midbrain
regions
beyond
substantia
nigra.
While
there
some
evidence
for
glial
involvement
disease,
molecular
mechanisms
remain
poorly
understood.
The
aim
this
study
was
to
characterize
contribution
all
cell
types
pathology
single-nuclei
RNA
sequencing
assess
type-specific
risk
using
latest
genome-wide
association
study.
We
profiled
>41
000
transcriptomes
post-mortem
from
six
idiopathic
patients
five
age-/sex-matched
controls.
validate
our
findings
spatial
context,
we
utilized
immunolabelling
same
tissues.
Moreover,
analysed
disease-associated
enrichment
genes
with
expression
patterns.
discovered
neuronal
cluster
CADPS2
overexpression
low
TH
levels,
which
exclusively
present
midbrains.
Validation
analyses
laser-microdissected
neurons
that
represents
dysfunctional
neurons.
With
regard
cells,
observed
an
increase
microglia
patients.
were
more
amoeboid,
indicating
activated
state.
reduction
oligodendrocyte
numbers
remaining
being
stress-induced
upregulation
S100B.
variants
associated
glia-
neuron-specific
gene
patterns
cases.
Furthermore,
astrocytes
presented
disease-specific
proliferation
dysregulation
related
unfolded
protein
response
cytokine
signalling.
reactive
patient
showed
CD44
overexpression,
revealed
pro-inflammatory
trajectory
elevated
levels
IL1B,
GPNMB
HSP90AA1.
Taken
together,
generated
first
dataset
midbrain,
highlights
as
well
'pan-glial'
activation
central
mechanism
movement
disorder.
This
finding
warrants
further
into
inflammatory
signalling
immunomodulatory
treatments
disease.
Science,
Journal Year:
2020,
Volume and Issue:
370(6512), P. 66 - 69
Published: Oct. 2, 2020
Dementia
is
a
rapidly
rising
global
health
crisis
that
silently
disables
families
and
ends
lives
livelihoods
around
the
world.
To
date,
however,
no
early
biomarkers
or
effective
therapies
exist.
It
now
clear
brain
microglia
are
more
than
mere
bystanders
amyloid
phagocytes;
they
can
act
as
governors
of
neuronal
function
homeostasis
in
adult
brain.
Here,
we
highlight
fundamental
role
tissue-resident
macrophages
health.
Then,
suggest
how
chronic
impairment
microglia-neuron
cross-talk
may
secure
permanence
failure
synaptic
Alzheimer's
Parkinson's
diseases.
Understanding
to
assess
modulate
interactions
critical
for
will
be
key
developing
dementia.
Signal Transduction and Targeted Therapy,
Journal Year:
2024,
Volume and Issue:
9(1)
Published: Feb. 16, 2024
Abstract
The
human
gastrointestinal
tract
is
populated
with
a
diverse
microbial
community.
vast
genetic
and
metabolic
potential
of
the
gut
microbiome
underpins
its
ubiquity
in
nearly
every
aspect
biology,
including
health
maintenance,
development,
aging,
disease.
advent
new
sequencing
technologies
culture-independent
methods
has
allowed
researchers
to
move
beyond
correlative
studies
toward
mechanistic
explorations
shed
light
on
microbiome–host
interactions.
Evidence
unveiled
bidirectional
communication
between
central
nervous
system,
referred
as
“microbiota–gut–brain
axis”.
microbiota–gut–brain
axis
represents
an
important
regulator
glial
functions,
making
it
actionable
target
ameliorate
development
progression
neurodegenerative
diseases.
In
this
review,
we
discuss
mechanisms
As
provides
essential
cues
microglia,
astrocytes,
oligodendrocytes,
examine
communications
microbiota
these
cells
during
healthy
states
Subsequently,
diseases
using
metabolite-centric
approach,
while
also
examining
role
microbiota-related
neurotransmitters
hormones.
Next,
targeting
intestinal
barrier,
blood–brain
meninges,
peripheral
immune
system
counteract
dysfunction
neurodegeneration.
Finally,
conclude
by
assessing
pre-clinical
clinical
evidence
probiotics,
prebiotics,
fecal
transplantation
A
thorough
comprehension
will
foster
effective
therapeutic
interventions
for
management
International Journal of Molecular Sciences,
Journal Year:
2021,
Volume and Issue:
22(9), P. 4676 - 4676
Published: April 28, 2021
With
the
world’s
population
ageing,
incidence
of
Parkinson’s
disease
(PD)
is
on
rise.
In
recent
years,
inflammatory
processes
have
emerged
as
prominent
contributors
to
pathology
PD.
There
great
evidence
that
microglia
a
significant
neuroprotective
role,
and
impaired
over
activated
microglial
phenotypes
are
present
in
brains
PD
patients.
Thereby,
progression
potentially
driven
by
vicious
cycle
between
dying
neurons
through
instigation
oxidative
stress,
mitophagy
autophagy
dysfunctions,
a-synuclein
accumulation,
pro-inflammatory
cytokine
release.
Hence,
investigating
involvement
importance
for
future
research
treatment
The
purpose
this
review
highlight
findings
concerning
microglia-neuronal
interplay
with
focus
human
postmortem
immunohistochemistry
single-cell
studies,
their
relation
animal
iPSC-derived
models,
newly
emerging
technologies,
resulting
potential
new
anti-inflammatory
therapies
Nature,
Journal Year:
2023,
Volume and Issue:
622(7981), P. 120 - 129
Published: Sept. 6, 2023
Abstract
Multimodal
astrocyte–neuron
communications
govern
brain
circuitry
assembly
and
function
1
.
For
example,
through
rapid
glutamate
release,
astrocytes
can
control
excitability,
plasticity
synchronous
activity
2,3
of
synaptic
networks,
while
also
contributing
to
their
dysregulation
in
neuropsychiatric
conditions
4–7
communicate
fast
focal
they
should
possess
an
apparatus
for
Ca
2+
-dependent
exocytosis
similar
neurons
8–10
However,
the
existence
this
mechanism
has
been
questioned
11–13
owing
inconsistent
data
14–17
a
lack
direct
supporting
evidence.
Here
we
revisited
astrocyte
hypothesis
by
considering
emerging
molecular
heterogeneity
18–21
using
molecular,
bioinformatic
imaging
approaches,
together
with
cell-specific
genetic
tools
that
interfere
vivo.
By
analysing
existing
single-cell
RNA-sequencing
databases
our
patch-seq
data,
identified
nine
molecularly
distinct
clusters
hippocampal
astrocytes,
among
which
found
notable
subpopulation
selectively
expressed
synaptic-like
glutamate-release
machinery
localized
discrete
sites.
Using
GluSnFR-based
22
situ
vivo,
corresponding
subgroup
responds
reliably
astrocyte-selective
stimulations
subsecond
release
events
at
spatially
precise
hotspots,
were
suppressed
astrocyte-targeted
deletion
vesicular
transporter
(VGLUT1).
Furthermore,
or
its
isoform
VGLUT2
revealed
specific
contributions
glutamatergic
cortico-hippocampal
nigrostriatal
circuits
during
normal
behaviour
pathological
processes.
uncovering
atypical
specialized
adult
brain,
provide
insights
into
complex
roles
central
nervous
system
(CNS)
physiology
diseases,
identify
potential
therapeutic
target.