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Myometrial Smooth Muscle Cell Contraction Pathway
- Molecular classification
- Signaling Pathway
01
Overview
The myometrial smooth muscle cell contraction pathway governs the contractile activity of the uterus, particularly relevant during labor. It involves a cascade of events starting with membrane depolarization, calcium influx through voltage-gated channels, activation of myosin light chain kinase (MLCK), and phosphorylation of myosin light chain (MLC20), leading to actin-myosin crossbridge cycling and muscle contraction. Key regulators include oxytocin, progesterone, estrogen, and nitric oxide. Disruption can lead to preterm labor or dysfunctional labor patterns.
- Other names
- Uterine Contraction PathwayMyometrium Contraction Mechanism
02
Mechanism of action
Varies depending on the drug; examples include: Oxytocin receptor agonism (oxytocin), Calcium channel blockade (nifedipine), Myosin light chain kinase inhibition, Rho Kinase (ROCK) inhibition
03
Biological functions
Muscle ContractionLabor and DeliveryRegulation of Uterine Tone
04
Disease associations
Preterm LaborDysfunctional LaborPostpartum Hemorrhage
05
Safety considerations
Uterine hyperstimulation (oxytocin)Cardiovascular side effects (nifedipine)Magnesium toxicity
06
Interacting drugs
Oxytocin
4 more in the full profile.
07
Biomarkers
Phosphorylated MLC20Intracellular Calcium ConcentrationOxytocin Receptor Expression
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