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cAMP-dependent
protein kinase
type II-beta
regulatory
subunit
cAMP-dependent
protein kinase
catalytic
subunit alpha
cAMP-dependent
protein kinase
catalytic
subunit beta
cAMP-dependent
protein kinase
type I-alpha
regulatory
subunit
cAMP-dependent
protein kinase
catalytic
subunit gamma
cAMP-dependent
protein kinase
type I-beta
regulatory
subunit
cAMP-dependent
protein kinase
type II-alpha
regulatory
subunit
Sodium-
dependent
dopamine
transporter
D(2) dopamine
receptor
Gγ
Adenylate
cyclase type 10
Synaptic
vesicular amine
transporter
Voltage-
dependent
calcium channel
subunit
alpha-2/delta-1
Voltage-
dependent
calcium channel
subunit
alpha-2/delta-2
Voltage-
dependent
N-type calcium
channel subunit
alpha-1B
Tyrosine
3-monooxygenase
Aromatic-L-
amino-acid
decarboxylase
Guanine
nucleotide-
binding protein
G(I)/G(S)/G(T)
subunit beta-1
Guanine
nucleotide-
binding protein
G(i) subunit
alpha-1
Ca
+
Dopamine
cAMP
Cocaine
Dopamine
Dopamine
Ca
+
L-Tyrosine
L-Dopa
CO
2
ATP
Magnesium
Fe2+
Pyridoxal
5'-phosphate
Neuronal
Excitability
The inhibition of dopamine
reuptake receptors by
Cocaine causes more dopamine
to accumulate in the
synapse, causing the
continual activation of the
D2 Dopamine receptor
Activation of D2 dopamine
receptors activates the Gi
signalling cascade which
leads to reduced cAMP.
Presynaptic Neuron
Cytosol
Synaptic Vesicle
Postsynaptic Neuron
Cytosol
Dopamine is produced in the
Ventral Tegmental Area of
the brain
Reduced cAMP results in
decreased neural
excitability. This has been
found to be linked to the
cause of addiction,
especially with cocaine.
Synapse
Increased dopamine activates
D2 dopamine receptorswhich
are associated with
regulating the reward
pathway.
Mesolimbic Pathway
Mesolimbic pathway
PRKAR2B
PRKACA
PRKACB
PRKAR1A
PRKACG
PRKAR1B
PRKAR2A
SLC6A3
DRD2
GNG2
ADCY10
SLC18A2
CACNA2D1
CACNA2D2
CACNA1B
TH
DDC
GNB1
GNAI1
Calcium
Dopamine
cAMP
Cocaine
Dopamine
Dopamine
Calcium
L-Tyrosine
L-Dopa
Carbon dioxide
Adenosine
triphosphate
Neuronal
Excitability
PRKAR2B
PRKACA
PRKACB
PRKAR1A
PRKACG
PRKAR1B
PRKAR2A
SLC6A3
DRD2
GNG2
ADCY10
SLC18A2
CACNA2D1
CACNA2D2
CACNA1B
TH
DDC
GNB1
GNAI1
Ca
+
LDP
cAMP
Cocaine
LDP
LDP
Ca
+
Tyr
L-Dopa
CO
2
ATP
Mg2+
Fe2+
Pyr-5'P
Neu Exc
The inhibition of dopamine
reuptake receptors by
Cocaine causes more dopamine
to accumulate in the
synapse, causing the
continual activation of the
D2 Dopamine receptor
Activation of D2 dopamine
receptors activates the Gi
signalling cascade which
leads to reduced cAMP.
Presynaptic Neuron
Cytosol
Synaptic Vesicle
Postsynaptic Neuron
Cytosol
Dopamine is produced in the
Ventral Tegmental Area of
the brain
Reduced cAMP results in
decreased neural
excitability. This has been
found to be linked to the
cause of addiction,
especially with cocaine.
Synapse
Increased dopamine activates
D2 dopamine receptorswhich
are associated with
regulating the reward
pathway.
Mesolimbic Pathway
Mesolimbic pathway