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Myosin light
chain kinase,
smooth muscle
Inositol 1,4,5-
trisphosphate
receptor type 1
Alpha-1A
adrenergic
receptor
Alpha-2A
adrenergic
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
Actin,
cytoplasmic 1
Myosin LC-P
Myosin light
chain 3
1-
phosphatidylinositol
4,5-
bisphosphate
phosphodiesterase
beta-1
Synaptic
vesicular amine
transporter
Sodium-
dependent
noradrenaline
transporter
Calmodulin-1
Serine/threonine-
protein
phosphatase
PP1-beta
catalytic
subunit
Tyrosine
3-monooxygenase
Aromatic-L-
amino-acid
decarboxylase
Dopamine beta-
hydroxylase
Calmodulin-1
Inositol 1,4,5-
trisphosphate
Norepinephrine
Ca
+
Norepinephrine
Ca
+
Ca
+
Norepinephrine
Ca
+
Phosphatidylinositol
4,5-
bisphosphate
L-Tyrosine
Tetrahydrobiopterin
O
2
L-Dopa
Dihydrobiopterin
H
2
O
Dopamine
CO
2
Ascorbic acid
O
2
Dehydroascorbic
acid
H
2
O
Magnesium
Calcium
Manganese
Ca
+
Diacylglycerol
Contraction
Relaxation
Gq signaling
cascade
Calcium
Fe2+
Pyridoxal
5'-phosphate
Pyrroloquinoline
quinone
Copper
Prazosin inhibits alpha1
adrenergic receptor on the
smooth muscle of the blood
vessel
Myosin LC-P interacts with
actin to produce smooth
muscle contraction. Since
there are low levels of
myosin LC-P, contraction is
inhibited
The Gq signaling cascade is
activated, leading to the
production of IP3
IP3 activates IP3 receptor
on the sarcoplasmic
reticulum leading to influx
of calcium into the cytosol
Calcium binds to calmodulin
and activates myosin light
chain kinase
Cytosol
Sarcoplasmic Reticulum
Presynaptic neuron
Calcium stimulates the
release of norepinephrine
into the synapse
Norepinephrine activates
presynaptic autoreceptors
α2 adrenergic receptors
activates the Gi signaling
cascade that inhibits
calcium channels
Norepinephrine is taken back
up to the presynaptic neuron
and recycled
Norepinephrine is
synthesized from tyrosine
and stored in synaptic
vesicles
Smooth muscle cell
MYLK
ITPR1
ADRA1A
ADRA2A
CACNA1A
CACNB1
CACNA2D2
ACTB
MYL3
MYL3
PLCB1
SLC18A2
SLC6A2
CALM1
PPP1CB
TH
DDC
DBH
CALM1
Inositol 1,4,5-
trisphosphate
Norepinephrine
Calcium
Norepinephrine
Calcium
Calcium
Norepinephrine
Calcium
Phosphatidylinositol
4,5-
bisphosphate
L-Tyrosine
Tetrahydrobiopterin
Oxygen
L-Dopa
Dihydrobiopterin
Water
Dopamine
Carbon dioxide
Ascorbic acid
Oxygen
Dehydroascorbic
acid
Water
Calcium
Diacylglycerol
Contraction
Relaxation
Gq signaling
cascade
MYLK
ITPR1
ADRA1A
ADRA2A
CACNA1A
CACNB1
CACNA2D2
ACTB
MYL3
MYL3
PLCB1
SLC18A2
SLC6A2
CALM1
PPP1CB
TH
DDC
DBH
CALM1
Inotp
Norpp
Ca
+
Norpp
Ca
+
Ca
+
Norpp
Ca
+
P45P
Tyr
BH4
O
2
L-Dopa
BH3
H
2
O
LDP