title: Coordination chemistry and insulin-enhancing behavior of vanadium complexes with maltol C6H6O3 structural isomers.
abstract: Syntheses of vanadium complexes using the naturally occurring ligands isomaltol (Hima) and allomaltol (Hama), as well as a newly synthesized, potentially tetradentate diaminodipyrone [H(2)(en(ama)(2)], are reported. Complete characterization of the resulting compounds [trans-VO(ima)(2)(H(2)O), VO(ama)(2), V(ima)(3), V(ama)(3) and VO(en(ama)(2))], including X-ray crystallography analyses for trans-VO(ima)(2)(H(2)O) and V(ima)(3), are presented herein. Potentiometric titrations (25 degrees C, I = 0.16 M NaCl) were used to measure stability constants in the V(IV)-Hima system; these data were compared to previous data collected on the V(IV)-L (L = Hma, Hama) systems. The in vivo efficacy of these compounds to lower the blood glucose levels of STZ-diabetic rats was tested; all but VO(en(ama)(2)) produced significant decreases in plasma glucose levels. The results were compared to those of the benchmark compound BMOV [VO(ma)(2), bis(maltolato)oxovanadium(IV)], a known insulin-enhancing agent.
authors.affiliation: Medicinal Inorganic Chemistry Group, Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: Katayoun
authors.initials: K
authors.lastname: Saatchi
authors.forename: Katherine H
authors.initials: KH
authors.lastname: Thompson
authors.forename: Brian O
authors.initials: BO
authors.lastname: Patrick
authors.forename: Maren
authors.initials: M
authors.lastname: Pink
authors.forename: Violet G
authors.initials: VG
authors.lastname: Yuen
authors.forename: John H
authors.initials: JH
authors.lastname: McNeill
authors.forename: Chris
authors.initials: C
authors.lastname: Orvig
mesh_terms: D000818:Animals; D001786:Blood Glucose / Q000032:analysis / Q000378:metabolism; D018360:Crystallography, X-Ray; D003921:Diabetes Mellitus, Experimental / Q000188:drug therapy / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007004:Hypoglycemic Agents / Q000494:pharmacology* / Q000627:therapeutic use; D007328:Insulin / Q000378:metabolism*; D007536:Isomerism; D008024:Ligands; D011753:Pyrones / Q000737:chemistry* / Q000494:pharmacology / Q000627:therapeutic use; D051381:Rats; D013997:Time Factors; D014638:Vanadates / Q000494:pharmacology / Q000627:therapeutic use; D017968:Vanadium Compounds / Q000737:chemistry* / Q000494:pharmacology / Q000627:therapeutic use
chemical_list: D001786:Blood Glucose; D007004:Hypoglycemic Agents; D007328:Insulin; D008024:Ligands; D011753:Pyrones; D017968:Vanadium Compounds; C074212:bis(maltolato)oxovanadium(IV); C008316:maltol; D014638:Vanadates