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Myosin light
chain kinase,
smooth muscle
Voltage-
dependent
L-type calcium
channel subunit
beta-1
Voltage-
dependent
L-type calcium
channel subunit
alpha-1C
Myosin LC-P
Myosin light
chain 3
Inositol 1,4,5-
trisphosphate
receptor type 1
Myosin light
chain
phosphatase
Calmodulin
Calmodulin
Voltage-
dependent
calcium channel
subunit
alpha-2/delta-1
Diltiazem
Ca
+
Ca
+
Ca
+
Diltiazem
Ca
+
Muscle
Contraction
Muscle
Relaxation
G Protein
Signalling
Cascade
Magnesium
Calcium
Manganese
Sarcoplasmic Reticulum
Cytosol
Vascular Smooth Muscle Cell
Diltiazem binds and inhibits
calcium channels preventing
calcium influx. The alpha-1C
and gamma-1 subunits are
targeted.
Activation or inhibition of
the receptors linked to the
G protein signalling cascade
can alter calcium levels in
the cell.
There is an overall decrease
in calcium levels in the
cytosol.
Decreased calcium is unable
to bind readily to
calmodulin.
The inhibition of myosin
light chain kinase prevents
the synthesis of Myosin LC-P
which leads to a high
concentration of myosin
light chain and muscle
relaxation.
Myosin unbinds from actin
causing the sarcomere
filaments to slide leading
to muscle relaxation.
Relaxation
Actin
Myosin
Diltiazem is administered as
an oral capsule or tablet
MYLK
CACNB1
CACNA1C
MYL3
MYL3
ITPR1
PPP1CB
CALM1
CALM1
CACNA2D1
Diltiazem
Calcium
Calcium
Calcium
Diltiazem
Calcium
Muscle
Contraction
Muscle
Relaxation
G Protein
Signalling
Cascade
MYLK
CACNB1
CACNA1C
MYL3
MYL3
ITPR1
PPP1CB
CALM1
CALM1
CACNA2D1
Diltiaz
Ca
+
Ca
+
Ca
+
Diltiaz
Ca
+
Mus Con
Mus Rel
G P S C
Mg2+
Ca2+
Mn2+
Sarcoplasmic Reticulum
Cytosol
Vascular Smooth Muscle Cell
Diltiazem binds and inhibits
calcium channels preventing
calcium influx. The alpha-1C
and gamma-1 subunits are
targeted.
Activation or inhibition of
the receptors linked to the
G protein signalling cascade
can alter calcium levels in
the cell.
There is an overall decrease
in calcium levels in the
cytosol.
Decreased calcium is unable
to bind readily to
calmodulin.
The inhibition of myosin
light chain kinase prevents
the synthesis of Myosin LC-P
which leads to a high
concentration of myosin
light chain and muscle
relaxation.
Myosin unbinds from actin
causing the sarcomere
filaments to slide leading
to muscle relaxation.
Relaxation
Actin
Myosin
Diltiazem is administered as
an oral capsule or tablet
MYLK
CACNB1
CACNA1C
MYL3
MYL3
ITPR1
PPP1CB
CALM1
CALM1
CACNA2D1
Diltiaz
Ca2+
Ca2+
Ca2+
Diltiaz
Ca2+
Mus Con
Mus Rel
G P S C
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