title: Heme-dependent activation of guanylate cyclase by nitric oxide: a novel signal transduction mechanism.
abstract: The interaction between nitric oxide (NO) synthesized in one cell and cytosolic guanylate-cyclase-bound heme located in adjacent target cells to generate the NO-heme adduct of guanylate cyclase represents a novel and widespread signal transduction mechanism that links extracellular stimuli to the biosynthesis of cyclic GMP in target cells. A variety of chemical factors interact with selective extracellular receptors and trigger the biosynthesis of NO from L-arginine. The unique chemistry of NO endows this molecule with the capacity to diffuse rapidly into nearby cells and stimulate cyclic GMP formation. Cyclic GMP acts as a messenger in each cell type to trigger different but complementary cellular responses within a localized environment. This transcellular signaling is a form of rapid intercellular communication allowing the simultaneous local initiation of increased blood flow, inhibition of platelet-induced thrombosis and other cellular functions.
authors.affiliation: Department of Pharmacology, UCLA School of Medicine.
authors.forename: L J
authors.initials: LJ
authors.lastname: Ignarro
mesh_terms: D000818:Animals; D001120:Arginine / Q000031:analogs & derivatives / Q000494:pharmacology; D004789:Enzyme Activation / Q000187:drug effects; D006162:Guanylate Cyclase / Q000378:metabolism*; D006418:Heme / Q000502:physiology*; D006801:Humans; D009569:Nitric Oxide / Q000494:pharmacology*; D015398:Signal Transduction
chemical_list: D009569:Nitric Oxide; D006418:Heme; D001120:Arginine; D006162:Guanylate Cyclase