title: Bicyclic analogues of D-myo-inositol 1,4,5-trisphosphate related to adenophostin A: synthesis and biological activity.
abstract: The high affinity of adenophostin A for 1D-myo-inositol 1,4,5-trisphosphate [Ins(1,4,5)P(3)] receptors may be related to an alteration in the position of its 2'-phosphate group relative to the corresponding 1-phosphate group in Ins(1,4,5)P(3). To investigate this possibility, two bicyclic trisphosphates 9 and 10, designed to explore the effect of relocating the 1-phosphate group of Ins(1,4,5)P(3) using a novel fused-ring system, were synthesized from myo-inositol. Biological evaluation of 9 and 10 at the Ins(1,4,5)P(3) receptors of hepatocytes showed that both were recognized by hepatic Ins(1,4,5)P(3) receptors and both stimulated release of Ca(2+) from intracellular stores, but they had lower affinity than Ins(1,4,5)P(3). This finding may be explained by considering the three-dimensional structures of 9 and 10 in light of recent studies on the conformation of adenophostin A.
authors.affiliation: Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
authors.forename: A M
authors.initials: AM
authors.lastname: Riley
authors.forename: V
authors.initials: V
authors.lastname: Correa
authors.forename: M F
authors.initials: MF
authors.lastname: Mahon
authors.forename: C W
authors.initials: CW
authors.lastname: Taylor
authors.forename: B V
authors.initials: BV
authors.lastname: Potter
mesh_terms: D000241:Adenosine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000494:pharmacology*; D000818:Animals; D002118:Calcium / Q000378:metabolism; D002120:Calcium Channel Agonists / Q000737:chemistry / Q000494:pharmacology*; D002855:Chromatography, Thin Layer; D018360:Crystallography, X-Ray; D022781:Hepatocytes / Q000187:drug effects / Q000378:metabolism; D066298:In Vitro Techniques; D007202:Indicators and Reagents; D015544:Inositol 1,4,5-Trisphosphate / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology*; D007700:Kinetics; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008566:Membranes / Q000187:drug effects / Q000378:metabolism; D008958:Models, Molecular; D008968:Molecular Conformation; D051381:Rats; D013056:Spectrophotometry, Ultraviolet; D013237:Stereoisomerism
chemical_list: D002120:Calcium Channel Agonists; D007202:Indicators and Reagents; C085029:adenophostin A; D015544:Inositol 1,4,5-Trisphosphate; D000241:Adenosine; D002118:Calcium