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D(2) dopamine
receptor
Voltage-
dependent
P/Q-type
calcium channel
subunit
alpha-1A
Voltage-
dependent
L-type calcium
channel subunit
beta-1
Voltage-
dependent
calcium channel
subunit
alpha-2/delta-2
Sodium-
dependent
dopamine
transporter
Synaptic
vesicular amine
transporter
Aromatic-L-
amino-acid
decarboxylase
Tyrosine
3-monooxygenase
Dopamine
Ca
+
Brexpiprazole
Ca
+
Dopamine
Dopamine
Brexpiprazole
Brexpiprazole
L-Dopa
CO
2
L-Tyrosine
Tetrahydrobiopterin
O
2
Dihydrobiopterin
H
2
O
Na
+
Na
+
Pyridoxal
5'-phosphate
Gi signaling
cascade
Fe2+
Cytosol
Postsynaptic Neuron
Presynaptic Neuron
Cytosol
Synaptic Vesicle
Synapse
Norepinephrine is
synthesized and stored in
synaptic vesicles at the
nerve terminal
Brexpiprazole is an
antagonist at D2 receptor.
↓ Positive, negative and
cognitive symptoms of
schizophrenia
Partial D2 receptor agonism
allows Brexpiprazole to
stimulate D2 receptors under
low dopamine conditions,
while attenuating their
activation when dopamine
levels are high
Brain
Mesolimbic pathway
Blood vessel - blood brain
barrier
Brexpiprazole is taken
orally and absorbed from the
gastrointestinal tract.
passive diffusion
DRD2
CACNA1A
CACNB1
CACNA2D2
SLC6A3
SLC18A2
DDC
TH
Dopamine
Calcium
Brexpiprazole
Calcium
Dopamine
Dopamine
Brexpiprazole
Brexpiprazole
L-Dopa
Carbon dioxide
L-Tyrosine
Tetrahydrobiopterin
Oxygen
Dihydrobiopterin
Water
Sodium
Sodium
Gi signaling
cascade
DRD2
CACNA1A
CACNB1
CACNA2D2
SLC6A3
SLC18A2
DDC
TH
LDP
Ca
+
Brexp
Ca
+
LDP
LDP
Brexp
Brexp
L-Dopa
CO
2
Tyr
BH4
O
2
BH3
H
2
O
Na
+
Na
+
Pyr-5'P
Gi si c
Fe2+
Cytosol
Postsynaptic Neuron
Presynaptic Neuron
Cytosol
Synaptic Vesicle
Synapse
Norepinephrine is
synthesized and stored in
synaptic vesicles at the
nerve terminal
Brexpiprazole is an
antagonist at D2 receptor.
↓ Positive, negative and
cognitive symptoms of
schizophrenia
Partial D2 receptor agonism
allows Brexpiprazole to
stimulate D2 receptors under
low dopamine conditions,
while attenuating their
activation when dopamine
levels are high
Brain
Mesolimbic pathway
Blood vessel - blood brain
barrier
Brexpiprazole is taken
orally and absorbed from the
gastrointestinal tract.
passive diffusion
DRD2
CACNA1A
CACNB1
CACNA2D2
SLC6A3
SLC18A2
DDC
TH
LDP
Ca2+
Brexp
Ca2+
LDP
LDP
Brexp
Brexp
L-Dopa
CO2
Tyr
BH4
O2
BH3
H2O
Na+
Na+
Gi si c