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Protein kinase
C alpha type
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
Gq protein
signaling
cascade
Phospholipase C
Inositol 1,4,5-
trisphosphate
receptor type 1
Myosin light
chain kinase,
smooth muscle
Alpha-1A
adrenergic
receptor
Myosin LC-P
Myosin light
chain 3
Myosin light
chain
phosphatase
Calmodulin-1
Calmodulin-1
Inositol 1,4,5-trisphosphate
Epinephrine
Ca
+
Ca
+
Ca
+
Epinephrine
ATP
Phosphatidylinositol
4,5-bisphosphate
Ca
+
Diacylglycerol
Muscle
Contraction
Muscle
Relaxation
Calcium
Magnesium
Calcium
Manganese
Sarcoplasmic Reticulum
Increased calcium binds
readily to calmodulin to
activate myosin light chain
kinase
There is an overall increase
in calcium levels in the
cytosol caused by the
activation of the Gq
signaling cascade
Cytosol
Myosin binds to actin
causing sarcomere filaments
to slide closer resulting in
muscle contraction
Activation of myosin light
chain kinase leads to high
concentration of myosin LC-P
which causes contractions of
the muscles
Vascular Smooth Muscle Cell
Constriction
Racepinephrine (Epinephrine)
binds alpha-1 adrenergic
receptor.
Actin Filament
Myosin Filament
Racepinephrine is
administered via respiratory
inhalation
PRKCA
CACNA1A
CACNB1
CACNA2D2
GNAQ
PLCB1
ITPR1
MYLK
ADRA1A
MYL3
MYL3
PPP1CB
CALM1
CALM1
Inositol 1,4,5-
trisphosphate
Epinephrine
Calcium
Calcium
Calcium
Epinephrine
Adenosine
triphosphate
Phosphatidylinositol
4,5-
bisphosphate
Calcium
Diacylglycerol
Muscle
Contraction
Muscle
Relaxation
PRKCA
CACNA1A
CACNB1
CACNA2D2
GNAQ
PLCB1
ITPR1
MYLK
ADRA1A
MYL3
MYL3
PPP1CB
CALM1
CALM1
Inotp
Eppy
Ca
+
Ca
+
Ca
+
Eppy
ATP
P45P
Ca
+
Diacylg
Mus Con
Mus Rel
Ca2+
Mg2+
Ca2+
Mn2+
Sarcoplasmic Reticulum
Increased calcium binds
readily to calmodulin to
activate myosin light chain
kinase
There is an overall increase
in calcium levels in the
cytosol caused by the
activation of the Gq
signaling cascade
Cytosol
Myosin binds to actin
causing sarcomere filaments
to slide closer resulting in
muscle contraction
Activation of myosin light
chain kinase leads to high
concentration of myosin LC-P
which causes contractions of
the muscles
Vascular Smooth Muscle Cell
Constriction
Racepinephrine (Epinephrine)
binds alpha-1 adrenergic
receptor.
Actin Filament
Myosin Filament
Racepinephrine is
administered via respiratory
inhalation