title: The prostaglandin E2 EP1 receptor mediates pain perception and regulates blood pressure.
abstract: The lipid mediator prostaglandin E2 (PGE2) has diverse biological activity in a variety of tissues. Four different receptor subtypes (EP1-4) mediate these wide-ranging effects. The EP-receptor subtypes differ in tissue distribution, ligand-binding affinity, and coupling to intracellular signaling pathways. To identify the physiological roles for one of these receptors, the EP1 receptor, we generated EP1-deficient (EP1-/-) mice using homologous recombination in embryonic stem cells derived from the DBA/1lacJ strain of mice. The EP1-/- mice are healthy and fertile, without any overt physical defects. However, their pain-sensitivity responses, tested in two acute prostaglandin-dependent models, were reduced by approximately 50%. This reduction in the perception of pain was virtually identical to that achieved through pharmacological inhibition of prostaglandin synthesis in wild-type mice using a cyclooxygenase inhibitor. In addition, systolic blood pressure is significantly reduced in EP1 receptor-deficient mice and accompanied by increased renin-angiotensin activity, especially in males, suggesting a role for this receptor in cardiovascular homeostasis. Thus, the EP1 receptor for PGE2 plays a direct role in mediating algesia and in regulation of blood pressure.
authors.affiliation: Genetic Technologies, Pfizer Global Research and Development, Groton, Connecticut 06340, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Stock
authors.forename: K
authors.initials: K
authors.lastname: Shinjo
authors.forename: J
authors.initials: J
authors.lastname: Burkhardt
authors.forename: M
authors.initials: M
authors.lastname: Roach
authors.forename: K
authors.initials: K
authors.lastname: Taniguchi
authors.forename: T
authors.initials: T
authors.lastname: Ishikawa
authors.forename: H S
authors.initials: HS
authors.lastname: Kim
authors.forename: P J
authors.initials: PJ
authors.lastname: Flannery
authors.forename: T M
authors.initials: TM
authors.lastname: Coffman
authors.forename: J D
authors.initials: JD
authors.lastname: McNeish
authors.forename: L P
authors.initials: LP
authors.lastname: Audoly
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology; D001794:Blood Pressure / Q000502:physiology*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005260:Female; D006579:Heterozygote; D007668:Kidney / Q000378:metabolism; D008168:Lung / Q000378:metabolism; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D009154:Mutation; D017288:Pain Threshold / Q000502:physiology*; D010894:Piroxicam / Q000494:pharmacology; D012333:RNA, Messenger / Q000032:analysis; D018078:Receptors, Prostaglandin E / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D058306:Receptors, Prostaglandin E, EP1 Subtype; D014599:Uterus / Q000378:metabolism
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D004791:Enzyme Inhibitors; C545636:Ptger1 protein, mouse; D012333:RNA, Messenger; D018078:Receptors, Prostaglandin E; D058306:Receptors, Prostaglandin E, EP1 Subtype; D010894:Piroxicam