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Alpha-1A
adrenergic
receptor
Guanine
nucleotide-
binding protein
G(q) subunit
alpha
Sodium-
dependent
noradrenaline
transporter
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
Dopamine beta-
hydroxylase
Aromatic-L-
amino-acid
decarboxylase
Tyrosine
3-monooxygenase
Ca
+
Norepinephrine
Norepinephrine
Cocaine
Norepinephrine
Ca
+
Dopamine
Ascorbic acid
O
2
Dehydroascorbic acid
H
2
O
L-Dopa
CO
2
L-Tyrosine
Pyrroloquinoline
quinone
Copper
Fe2+
Norepinephrine
Alpha 1A
Adrenergic
Blood Vessel
Relaxation
Pathway
Pyridoxal
5'-phosphate
Cytosol
Presynaptic Neuron
The inhibition of
norepinephrine reuptake
receptors by Cocaine causes
more norepinephrine to
accumulate in the synapse,
causing the continual
activation of the alpha-2A
adrenergic receptor
Synapse
Synaptic Vesicle
Norepinephrine is produced
in the locus coeruleus
Cytosol
Increased norepinephrine
activates Alpha-2A
adrenergic receptors in the
blood vessels in the nose.
Smooth Muscle Myocyte
The increased activation of
adrenergic receptors
increases the contraction of
smooth muscles in blood
vessels which causes the
blood vessels to constrict.
Nose blood vessels
Actin Filament
Myosin Filament
Myosin unbinds to actin
causing muscle relaxation
and vasodilation
Vasodilation
ADRA1A
GNAQ
SLC6A2
SLC18A2
CACNA2D1
CACNA2D2
CACNA1B
DBH
DDC
TH
Calcium
Norepinephrine
Norepinephrine
Cocaine
Norepinephrine
Calcium
Dopamine
Ascorbic acid
Oxygen
Dehydroascorbic
acid
Water
L-Dopa
Carbon dioxide
L-Tyrosine
Norepinephrine
Alpha 1A
Adrenergic
Blood Vessel
Relaxation
Pathway