Prostaglandin E2 is a lipid-derived signaling hormone involved in inflammation, vascular regulation, fever generation, immune communication, smooth muscle activity, reproductive physiology, and tissue repair. PGE2 is synthesized rapidly in response to cellular stimulation and acts locally within tissues to coordinate adaptive inflammatory and vascular responses.
The hormone influences blood vessel dilation, vascular permeability, pain sensitivity, gastrointestinal mucosal signaling, uterine contraction pathways, and immune-cell communication. PGE2 also contributes to regulation of body temperature through hypothalamic signaling during inflammatory states. Depending on tissue context and receptor subtype activation, PGE2 can produce either stimulatory or modulatory effects on immune and vascular systems.
PGE2 is produced from arachidonic acid released from membrane phospholipids through phospholipase A2 activity. Cyclooxygenase enzymes convert arachidonic acid into prostaglandin intermediates, which are then processed by prostaglandin E synthase into PGE2.
Production occurs in immune cells, endothelial cells, fibroblasts, reproductive tissues, kidneys, gastrointestinal tissues, nervous tissue, and additional organs during physiological stimulation. Because prostaglandins are synthesized on demand rather than stored in secretory vesicles, production reflects immediate cellular signaling activity and local inflammatory conditions.
PGE2 synthesis is regulated by inflammatory cytokines, oxidative stress, immune activation, growth factors, mechanical tissue stress, and phospholipase signaling pathways. Cyclooxygenase expression strongly influences production rates, especially during inflammatory activation and tissue remodeling.
PGE2 acts through EP receptor subtypes that activate cyclic AMP pathways, calcium signaling systems, phospholipase signaling cascades, and vascular regulatory mechanisms. Local degradation enzymes rapidly terminate signaling activity, limiting endocrine spread and maintaining tissue-specific regulation. Through these integrated lipid-signaling pathways, PGE2 coordinates inflammatory adaptation, vascular responsiveness, tissue remodeling, immune communication, and reproductive smooth muscle physiology.
A locally acting eicosanoid made via COX and PGE synthases that shapes inflammation, vascular tone, gastric protection, kidney flow, and reproduction.
