Gut,
Journal Year:
2022,
Volume and Issue:
72(3), P. 501 - 511
Published: July 8, 2022
Objective
Methionine
metabolism
is
involved
in
a
myriad
of
cellular
functions,
including
methylation
reactions
and
redox
maintenance.
Nevertheless,
it
remains
unclear
whether
methionine
metabolism,
RNA
antitumour
immunity
are
molecularly
intertwined.
Design
The
effect
methionine-restricted
diet
(MRD)
feeding
was
assessed
murine
models.
mechanisms
YTH
domain-containing
family
protein
1
(YTHDF1)
tumour
immune
escape
were
determined
vitro
vivo.
synergistic
effects
MRD
or
YTHDF1
depletion
with
PD-1
blockade
also
investigated.
Results
We
found
that
dietary
restriction
reduced
growth
enhanced
by
increasing
the
number
cytotoxicity
tumour-infiltrating
CD8
+
T
cells
different
mouse
Mechanistically,
S-adenosylmethionine
derived
from
promoted
N
6
-methyladenosine
(m
A)
translation
checkpoints,
PD-L1
V-domain
Ig
suppressor
cell
activation
(VISTA),
cells.
Furthermore,
m
A-specific
binding
inhibited
restoring
infiltration
cells,
synergised
for
better
control.
Clinically,
expression
correlated
poor
prognosis
immunotherapy
outcomes
cancer
patients.
Conclusions
play
critical
role
anticancer
through
regulating
functions
Targeting
could
be
potential
new
strategy
immunotherapy.
Journal of Experimental & Clinical Cancer Research,
Journal Year:
2022,
Volume and Issue:
41(1)
Published: April 15, 2022
Abstract
Glioblastoma
(GBM)
is
the
most
common
high-grade
primary
malignant
brain
tumor
with
an
extremely
poor
prognosis.
Given
survival
currently
approved
treatments
for
GBM,
new
therapeutic
strategies
are
urgently
needed.
Advances
in
decades
of
investment
basic
science
glioblastoma
rapidly
translated
into
innovative
clinical
trials,
utilizing
improved
genetic
and
epigenetic
profiling
as
well
microenvironment
immune
system
interactions.
Following
these
encouraging
findings,
immunotherapy
including
checkpoint
blockade,
chimeric
antigen
receptor
T
(CAR
T)
cell
therapy,
oncolytic
virotherapy,
vaccine
therapy
have
offered
hope
improving
GBM
outcomes;
ongoing
studies
using
combinatorial
therapies
aim
minimizing
adverse
side-effects
augmenting
antitumor
responses.
In
addition,
techniques
to
overcome
blood-brain
barrier
(BBB)
targeted
delivery
being
tested
trials
patients
recurrent
GBM.
Here,
we
set
forth
rationales
promising
treating
review
potential
novel
agents,
current
status
preclinical
discuss
challenges
future
perspectives
immuno-oncology.
Neuro-Oncology,
Journal Year:
2022,
Volume and Issue:
24(11), P. 1935 - 1949
Published: April 28, 2022
Abstract
Background
Nearly
all
patients
with
newly
diagnosed
glioblastoma
experience
recurrence
following
standard-of-care
radiotherapy
(RT)
+
temozolomide
(TMZ).
The
purpose
of
the
phase
III
randomized
CheckMate
548
study
was
to
evaluate
RT
TMZ
combined
immune
checkpoint
inhibitor
nivolumab
(NIVO)
or
placebo
(PBO)
in
methylated
MGMT
promoter
(NCT02667587).
Methods
Patients
(N
=
716)
were
1:1
NIVO
[(240
mg
every
2
weeks
×
8,
then
480
4
weeks)
(60
Gy
over
6
(75
mg/m2
once
daily
during
RT,
150-200
on
days
1-5
28-day
cycle
6)]
PBO
same
regimen.
primary
endpoints
progression-free
survival
(PFS)
and
overall
(OS)
without
baseline
corticosteroids
patients.
Results
As
December
22,
2020,
median
(m)PFS
(blinded
independent
central
review)
10.6
months
(95%
CI,
8.9-11.8)
vs
10.3
9.7-12.5)
(HR,
1.1;
95%
0.9-1.3)
mOS
28.9
24.4-31.6)
32.1
29.4-33.8),
respectively
0.9-1.3).
In
corticosteroids,
31.3
28.6-34.8)
33.0
31.0-35.1)
0.9-1.4).
Grade
3/4
treatment-related
adverse
event
rates
52.4%
33.6%,
respectively.
Conclusions
added
did
not
improve
indeterminate
promoter.
No
new
safety
signals
observed.
Journal for ImmunoTherapy of Cancer,
Journal Year:
2019,
Volume and Issue:
7(1)
Published: Nov. 14, 2019
Despite
remarkable
success
in
the
treatment
of
hematological
malignancies,
CAR
T-cell
therapies
for
solid
tumors
have
floundered,
large
part
due
to
local
immune
suppression
and
effects
prolonged
stimulation
leading
dysfunction
exhaustion.
One
mechanism
by
which
gliomas
other
cancers
can
hamper
T
cells
is
through
surface
expression
inhibitory
ligands
such
as
programmed
cell
death
ligand
1
(PD-L1).
Using
CRIPSR-Cas9
system,
we
created
universal
resistant
PD-1
inhibition
multiplexed
gene
disruption
endogenous
receptor
(TRAC),
beta-2
microglobulin
(B2M)
(PDCD1).
Triple
gene-edited
demonstrated
enhanced
activity
preclinical
glioma
models.
Prolonged
survival
mice
bearing
intracranial
was
achieved
after
intracerebral,
but
not
intravenous
administration.
CRISPR-Cas9
gene-editing
only
provides
a
potential
source
allogeneic,
donor
cells,
also
enables
simultaneous
checkpoint
signaling
that
otherwise
impedes
maximal
antitumor
functionality.
Cancer
immunotherapy
by
immune
checkpoint
blockade
has
proven
its
great
potential
saving
the
lives
of
a
proportion
late
stage
patients
with
immunogenic
tumor
types.
However,
even
in
these
sensitive
types,
majority
do
not
sufficiently
respond
to
therapy.
Furthermore,
other
including
glioblastoma,
remain
largely
refractory.
The
glioblastoma
microenvironment
is
recognized
as
highly
immunosuppressive,
posing
major
hurdle
for
inducing
immune-mediated
destruction
cancer
cells.
Scattered
information
available
about
presence
and
activity
immunosuppressive
or
immunostimulatory
cell
types
tumors,
tumor-associated
macrophages,
tumor-infiltrating
dendritic
cells
regulatory
T
These
are
heterogeneous
at
level
ontogeny,
spatial
distribution
functionality
within
compartment,
providing
insight
complex
cellular
molecular
interplay
that
determines
refractory
state
glioblastoma.
This
knowledge
may
also
yield
next
generation
targets
therapeutic
intervention.