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Myosin light
chain kinase,
smooth muscle
Adenylate
cyclase type 9
cAMP-dependent
protein kinase
type I-alpha
regulatory
subunit
cAMP-dependent
protein kinase
type II-alpha
regulatory
subunit
Protein kinase
C alpha type
Beta-2
adrenergic
receptor
Myosin LC-P
Myosin light
chain 3
Inositol 1,4,5-
trisphosphate
receptor type 1
Voltage-
dependent
L-type calcium
channel subunit
beta-1
Voltage-
dependent
L-type calcium
channel subunit
alpha-1C
Myosin light
chain
phosphatase
Intermediate
conductance
calcium-
activated
potassium
channel protein
4
Phospholipase C
G protein
complex
Guanine
nucleotide-
binding protein
alpha
Calmodulin-1
Guanine
nucleotide-
binding protein
G(I)/G(S)/G(T)
subunit beta-1
Guanine
nucleotide-
binding protein
G(I)/G(S)/G(O)
subunit
gamma-12
Voltage-
dependent
calcium channel
subunit
alpha-2/delta-1
Nadolol
Ca
+
Ca
+
K
+
K
+
Ca
+
Nadolol
GDP
GTP
ATP
cAMP
Inositol 1,4,5-trisphosphate
Phosphatidylinositol
4,5-bisphosphate
Diacylglycerol
GTP
P
i
P
i
P
i
Calcium
Ca
+
Muscle
Contraction
Muscle
Relaxation
Magnesium
Calcium
Manganese
Sarcoplasmic Reticulum
Cytosol
Vascular Smooth Muscle Cell
Nadolol binds to beta-2
adrenergic receptor.
The G protein signalling
cascade is blocked from
occurring as the beta
receptor is inhibited
Reduced cAMP means PKA isn't
activated, allowing for
intracellular levels of
potassium and calcium to
increase
Adenylyl cyclase is unable
to be activated leading to
decreased intracellular cAMP
There is an overall increase
in calcium levels in the
cytosol.
Calcium readily binds to
calmodulin
High concentrations of
myosin LC-P allow for muscle
contraction
Constriction
Myosin unbinds from actin
causing the sarcomere
filaments to slide leading
to muscle relaxation.
Actin Filament
Myosin Filament
Nadolol is administered as
an oral tablet
MYLK
ADCY9
PRKAR1A
PRKAR2A
PRKCA
ADRB2
MYL3
MYL3
ITPR1
CACNB1
CACNA1C
PPP1CB
KCNN4
PLCB1
GNB1
GNAS
CALM1
GNB1
GNG12
CACNA2D1
Nadolol
Calcium
Calcium
Potassium
Potassium
Calcium
Nadolol
Guanosine
diphosphate
Guanosine
triphosphate
Adenosine
triphosphate
cAMP
Inositol 1,4,5-
trisphosphate
Phosphatidylinositol
4,5-
bisphosphate
Diacylglycerol
Guanosine
triphosphate
Phosphate
Phosphate
Phosphate
Calcium
Muscle
Contraction
Muscle
Relaxation