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Oxytocin
receptor
Gq protein
signaling
cascade
Phospholipase C
Inositol 1,4,5-
trisphosphate
receptor type 3
Myosin light
chain kinase,
smooth muscle
Protein kinase
C
Mitogen-
activated
protein kinase
1
Mitogen-
activated
protein kinase
3
Cytosolic
phospholipase
A2
Transforming
protein RhoA
Rho-associated
protein kinase
1
Gq protein
signaling
cascade
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
Myosin light
chain 3
Calmodulin-1
Myosin LC-P
Myosin light
chain
phosphatase
CPI-17
CPI-17-P
Myosin light
chain
phosphatase-P
Actin,
cytoplasmic 1
Calmodulin-1
Actin,
cytoplasmic 1
Myosin light
chain 3
Oxytocin
Inositol 1,4,5-trisphosphate
Ca
+
Ca
+
Ca
+
Ca
+
Phosphatidylinositol
4,5-bisphosphate
Calcium
Magnesium
Calcium
Calcium
Magnesium
Magnesium
Manganese
Manganese
Ca
+
Diacylglycerol
Muscle
Relaxation
Prostaglandin
Synthesis
Muscle
Contraction
Myometrial Cell
Sarcoplasmic Reticulum
Cytosol
Oxytocin activates the
oxytocin receptor on the
myometrial cell leading to
activation of the Gq
signaling cascade
Gq signaling cascade
activates phospholipase C
which produces IP3 and DAG
IP3 activates IP3 receptor
on the sarcoplasmic
reticulum, leading to
calcium moving from the
sarcoplasmic reticulum to
the cytosol, increasing
cytosolic calcium
concentration
Calcium also enters the cell
through the L-type calcium
channel on the cell
membrane, which is activated
downstream after activation
of the oxytocin receptor
Calcium binds to calmodulin
activating myosin light
chain kinase, leading to
phosphorylation of myosin
light chain
Phosphorylated myosin light
chain binds to actin to form
an actinomyosin complex
which causes smooth muscle
contraction
Muscle contraction
The RhoA protein and protein
kinase C can also lead to
the inactivated,
phosphorylated form of
myosin light chain
phosphatase, preventing the
conversion of myosin-LC-P to
Myosin-LC
Protein kinase C leads to
prostaglandin synthesis.
Prostaglandins like E2
stimulates uterine
contraction
Oxytocin is taken
intravenously or
intramuscularly
OXTR
Gq protein
signaling
cascade
PLCB1
ITPR3
MYLK
PRKCA
MAPK1
MAPK3
PLA2G4A
RHOA
ROCK1
Gq protein
signaling
cascade
CACNA1A
CACNB1
CACNA2D2
MYL3
CALM1
MYL3
PPP1CB
PPP1R14A
PPP1R14A
PPP1CB
ACTB
CALM1
ACTB
MYL3
Oxytocin
Inositol 1,4,5-
trisphosphate
Calcium
Calcium
Calcium
Calcium
Phosphatidylinositol
4,5-
bisphosphate
Calcium
Diacylglycerol
Muscle
Relaxation
Prostaglandin
Synthesis
Muscle
Contraction
OXTR
GNAQ
PLCB1
ITPR3
MYLK
PRKCA
MAPK1
MAPK3
PLA2G4A
RHOA
ROCK1
GNAQ
CACNA1A
CACNB1
CACNA2D2
MYL3
CALM1
MYL3
PPP1CB
PPP1R14A
PPP1R14A
PPP1CB
ACTB
CALM1
ACTB
MYL3
Oxt
Inotp
Ca
+
Ca
+
Ca
+
Ca
+
P45P
Ca2+
Mg2+
Ca2+
Ca2+
Mg2+
Mg2+
Mn2+
Mn2+
Ca
+
Diacylg
Mus Rel
Pro Syn
Mus Con
Myometrial Cell
Sarcoplasmic Reticulum
Cytosol
Oxytocin activates the
oxytocin receptor on the
myometrial cell leading to
activation of the Gq
signaling cascade
Gq signaling cascade
activates phospholipase C
which produces IP3 and DAG
IP3 activates IP3 receptor
on the sarcoplasmic
reticulum, leading to
calcium moving from the
sarcoplasmic reticulum to
the cytosol, increasing
cytosolic calcium
concentration
Calcium also enters the cell
through the L-type calcium
channel on the cell
membrane, which is activated
downstream after activation
of the oxytocin receptor
Calcium binds to calmodulin
activating myosin light
chain kinase, leading to
phosphorylation of myosin
light chain
Phosphorylated myosin light
chain binds to actin to form
an actinomyosin complex
which causes smooth muscle
contraction
Muscle contraction
The RhoA protein and protein
kinase C can also lead to
the inactivated,
phosphorylated form of
myosin light chain
phosphatase, preventing the
conversion of myosin-LC-P to
Myosin-LC
Protein kinase C leads to
prostaglandin synthesis.
Prostaglandins like E2
stimulates uterine
contraction
Oxytocin is taken
intravenously or
intramuscularly
OXTR
GNAQ
PLCB1
ITPR3
MYLK
PRKCA
MAPK1
MAPK3
PLA2G4A
RHOA
ROCK1
GNAQ
CACNA1A
CACNB1
CACNA2D2
MYL3
CALM1
MYL3
PPP1CB
PPP1R14A
PPP1R14A
PPP1CB
ACTB
CALM1
ACTB
MYL3
Oxt
Inotp
Ca2+
Ca2+
Ca2+
Ca2+
P45P
Ca2+
Diacylg
Mus Rel
Pro Syn
Mus Con