Uterine smooth muscle cell

Uterine smooth muscle cells (myometrial cells) are specialized contractile cells forming the bulk of the myometrium, the muscular wall of the uterus[1][4]. Their contraction and relaxation underlie the expulsion of uterine contents during menstruation and labor. Contraction is primarily regulated by changes in intracellular calcium in response to hormonal signals such as oxytocin, prostaglandins, and other neurohumoral agents[1][6]. These cells are involved in pathological states such as uterine fibroids (benign tumors), leiomyosarcoma (malignant tumors), and disorders of contractility leading to obstetric complications[2][8]. Drugs targeting uterine smooth muscle cell receptors are used clinically to manage preterm labor, induce labor, and treat postpartum hemorrhage, but the cells themselves are not molecule-level therapeutic targets as traditionally defined; rather, their functional regulation is the target of therapy.

Other names

Myometrial smooth muscle cellUterine myocyteMyocyte (uterus)

Direct agonism or antagonism of G protein-coupled receptors on the myometrial cell membrane to modulate intracellular calcium and induce or inhibit contractility Inhibition of calcium influx to block contraction Activation/inhibition of intracellular signaling pathways (e.g., cAMP, phosphoinositide cascade)