401
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402
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Rangel M, Leite A, João Amorim M, Garribba E, Micera G, Lodyga-Chruscinska E. Spectroscopic and Potentiometric Characterization of Oxovanadium(IV) Complexes Formed by 3-Hydroxy-4-Pyridinones. Rationalization of the Influence of Basicity and Electronic Structure of the Ligand on the Properties of VIVO Species in Aqueous Solution. Inorg Chem 2006; 45:8086-97. [PMID: 16999406 DOI: 10.1021/ic0605571] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Aqueous solution studies regarding the identification and characterization of complexes formed by the VIVO ion and 11 3-hydroxy-4-pyridinone derivatives have been performed using EPR and UV/vis spectroscopic techniques. For the three ligands (HL) adequately soluble in water (1-methyl-3-hydroxy-4-pyridinone, 1-methyl-2-ethyl-3-hydroxy-4-pyridinone, and 1,2-diethyl-3-hydroxy-4-pyridinone), potentiometric titrations were performed; the results are consistent with the formation of [V(IV)OL]+, [V(IV)OL2], [V(IV)OL2H(-1)]-, [(V(IV)O)2L2H(-2)], and [V(IV)L3]+ species. Bis chelated complexes are characterized by a cis-trans isomerism, the trans isomer being strongly favored with respect to the cis arrangement. Tris chelated non-oxo V(IV) species were prepared in CH3COOH; their spectroscopic features point to a d(z2) ground state and a geometry intermediate between an octahedron and a trigonal prism, related to the steric requirements of the substituent on the carbon atom in position 2 of the pyridinone ring. Four new solid derivatives, [V(IV)O(1,2-diethyl-3-hydroxy-4-pyridinonato)2], [V(IV)O(1-(p-tolyl)-2-ethyl-3-hydroxy-4-pyridinonato)2], [V(IV)O(1-(p-(n-butyl)phenyl)-2-ethyl-3-hydroxy-4-pyridinonato)2], and [V(IV)O(1-(p-(n-hexyl)phenyl)-2-ethyl-3-hydroxy-4-pyridinonato)2], were isolated and characterized; they exhibited a five-coordinate geometry close to square-pyramid. A criterion for establishing the degree of distortion toward the trigonal-bipyramid on the basis of the electronic absorption spectra is provided. Relationships between the pKa of the -OH group in position 3 of the ring and (i) log K of mono and bis chelated complexes, (ii) pK of the water molecule in cis-[V(IV)OL2(H2O)], (iii) log K of tris chelated species [V(IV)L3]+, and (iv) 51V hyperfine coupling constant (Az) have been established and discussed for a number of pyrone, pyridinone, and catechol ligands. The results are rationalized by assuming for pyridinones an electronic structure intermediate between that of pyrones and catechols. The relationships are valuable to the understanding of the behavior of VIVO species in aqueous solution.
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Affiliation(s)
- Maria Rangel
- REQUIMTE, Instituto de Ciências Biomédicas de Abel Salazar, Universidade do Porto, Largo Abel Salazar 2, 4099-003 Porto, Portugal
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403
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Affiliation(s)
- András Gorzsás
- Department of Chemistry, Inorganic Chemistry, Umeå University, 90187 Umeå, Sweden, Fax: +46‐90‐786‐9195
- Present address: Department of Forest Genetics and Plant Physiology, Umeå Plant Science Centre, 90183 Umeå, Sweden
| | - Ingegärd Andersson
- Department of Chemistry, Inorganic Chemistry, Umeå University, 90187 Umeå, Sweden, Fax: +46‐90‐786‐9195
| | - Lage Pettersson
- Department of Chemistry, Inorganic Chemistry, Umeå University, 90187 Umeå, Sweden, Fax: +46‐90‐786‐9195
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404
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An oxovanadium(IV) complex derived from l-histidine, [V2O2(l-his)2(2,2′-bipy)2]·[C2H6O2·(2,2′-bipy)]: Hydrothermal synthesis, crystal structure and magnetic properties. INORG CHEM COMMUN 2006. [DOI: 10.1016/j.inoche.2006.06.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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405
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Dörnyei Á, Marcão S, Costa Pessoa J, Jakusch T, Kiss T. Interactions of Insulin-Mimetic Vanadium Complexes with the Cell Constituents ATP and Glutathione. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600385] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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406
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Costa Pessoa J, Marcão S, Correia I, Gonçalves G, Dörnyei A, Kiss T, Jakusch T, Tomaz I, Castro MMCA, Geraldes CFGC, Avecilla F. Vanadium (IV and V) Complexes of Reduced Schiff Bases Derived from the Reaction of Aromatico-Hydroxyaldehydes and Diamines Containing Carboxyl Groups. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600309] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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407
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Kiss T, Jakusch T, Bouhsina S, Sakurai H, Enyedy ÉA. Binding Constant of VIVO to Transferrin. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600314] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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408
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Gätjens J, Meier B, Adachi Y, Sakurai H, Rehder D. Characterization and Insulin-Mimetic Potential of Oxidovanadium(IV) Complexes Derived from Monoesters and -carboxylates of 2,5-Dipicolinic Acid. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600130] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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409
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Karmaker S, Saha TK, Yoshikawa Y, Yasui H, Sakurai H. A novel drug delivery system for type 1 diabetes: Insulin-mimetic vanadyl-poly(γ-glutamic acid) complex. J Inorg Biochem 2006; 100:1535-46. [PMID: 16824605 DOI: 10.1016/j.jinorgbio.2006.05.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2005] [Revised: 05/12/2006] [Accepted: 05/12/2006] [Indexed: 11/15/2022]
Abstract
Insulin-mimetic vanadyl-poly(gamma-glutamic acid) complex, VO-gamma-PGA, is proposed as a novel drug delivery system for treating type 1 diabetic animals. The structure of VO-gamma-PGA in solution as well as in solid state was analyzed by electronic absorption, infra-red, and electron spin resonance spectra, and proposed that the equatorial coordination mode of VO(2+) is in either carboxylate(O)-VO-(OH(2))(3) or 2 carboxylate(O(2))-VO-(OH(2))(2). In vitro insulin-mimetic activity, metallokinetic feature in the blood of healthy rats, and in vivo normoglycemic effect of the complex prepared in solution were evaluated in streptozotocin(STZ)-induced type 1 diabetic mice, and these effects were compared with those of a solution containing only VOSO(4) as a positive control. The in vitro insulin-mimetic activity of VO-gamma-PGA was examined by determining both inhibition of free fatty acid (FFA) release and glucose uptake in isolated rat adipocytes, in which the concentration of VO-gamma-PGA for 50% inhibition of FFA release was significantly lower than that of VOSO(4). Metallokinetic study suggested that the bioavailability of VO-gamma-PGA complex was much higher than that of VOSO(4). The complex showed a significant hypoglycemic activity within at least 4h after a single oral administration, the effect being sustained for at least 24h. Furthermore, VO-gamma-PGA normalized the hyperglycemia in STZ-mice within 3 days when it was given orally at doses of 5-10mgVkg(-1) body mass for 16 days. The improvement in diabetes was also supported by the results on oral glucose tolerance test, HbA(1c) levels, and blood pressure.
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Affiliation(s)
- Subarna Karmaker
- Department of Analytical and Bioinorganic Chemistry, Kyoto Pharmaceutical University, 5 Nakauchi-cho, Misasagi, Yamashina-ku, Kyoto 607-8414, Japan
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410
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411
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Xing YH, Aoki K, Bai FY. A New Insulin-Like Vanadyl Complex: Synthesis and Structure of V(IV)O(H2O)2 (2,6-PyridineDicarboxylate)E2H2O. J COORD CHEM 2006. [DOI: 10.1080/00958970410001666161] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Yong Heng Xing
- a Department of Chemistry , Liaoning Normal University , Mail Box 600#, Huanghe Road 850#, Dalian City, P.R. China , 116029
| | - Katsuyuki Aoki
- b Department of Materials Science , Toyohashi University of Technology , Tempaku-cho, Toyohashi 441-8580, Japan
| | - Feng Ying Bai
- a Department of Chemistry , Liaoning Normal University , Mail Box 600#, Huanghe Road 850#, Dalian City, P.R. China , 116029
- b Department of Materials Science , Toyohashi University of Technology , Tempaku-cho, Toyohashi 441-8580, Japan
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412
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Affiliation(s)
- Enrique J. Baran
- a Centro de Química Inorgánica (CEQUINOR/CONICET,UNLP) Facultad de Ciencias Exactas, Universidad Nacional de La Plata , C. Correo 962, La Plata, 1900, Argentina
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413
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Saha TK, Yoshikawa Y, Yasui H, Sakurai H. Oxovanadium(IV)–Porphyrin Complex as a Potent Insulin-Mimetic. Treatment of Experimental Type 1 Diabetic Mice by the Complex [meso-Tetrakis(4-sulfonatophenyl)porphyrinato]oxovanadate(IV)(4−). BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2006. [DOI: 10.1246/bcsj.79.1191] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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414
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Garribba E, Micera G, Lodyga-Chruscinska E, Sanna D. Oxovanadium(IV) Complexes with Pyrazinecarboxylic Acids:The Coordinating Properties of Ligands with the (Naromatic, COO–) Donor Set. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600230] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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415
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Adachi Y, Yoshikawa Y, Yoshida J, Kodera Y, Katoh A, Takada J, Sakurai H. Improvement of diabetes, obesity and hypertension in type 2 diabetic KKAy mice by bis(allixinato)oxovanadium(IV) complex. Biochem Biophys Res Commun 2006; 345:945-50. [PMID: 16707105 DOI: 10.1016/j.bbrc.2006.05.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2006] [Accepted: 05/01/2006] [Indexed: 11/19/2022]
Abstract
Previously, we found that bis(allixinato)oxovanadium(IV) (VO(alx)(2)) exhibits a potent hypoglycemic activity in type 1-like diabetic mice. Since the enhancement of insulin sensitivity is involved in one of the mechanisms by which vanadium exerts its anti-diabetic effects, VO(alx)(2) was further tested in type 2 diabetes with low insulin sensitivity. The effect of oral administration of VO(alx)(2) was examined in obesity-linked type 2 diabetic KKA(y) mice. Treatment of VO(alx)(2) for 4 weeks normalized hyperglycemia, glucose intolerance, hyperinsulinemia, hypercholesterolemia and hypertension in KKA(y) mice; however, it had no effect on hypoadiponectinemia. VO(alx)(2) also improved hyperleptinemia, following attenuation of obesity in KKA(y) mice. This is the first example in which a vanadium compound improved leptin resistance in type 2 diabetes by oral administration. On the basis of these results, VO(alx)(2) is proposed to enhance not only insulin sensitivity but also leptin sensitivity, which in turn improves diabetes, obesity and hypertension in an obesity-linked type 2 diabetic animal.
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Affiliation(s)
- Yusuke Adachi
- Department of Analytical and Bioinorganic Chemistry, Kyoto Pharmaceutical University, 5 Nakauchi-cho, Misasagi, Yamashina-ku, Kyoto 607-8414, Japan
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416
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Crans DC, Rithner CD, Baruah B, Gourley BL, Levinger NE. Molecular probe location in reverse micelles determined by NMR dipolar interactions. J Am Chem Soc 2006; 128:4437-45. [PMID: 16569021 DOI: 10.1021/ja0583721] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The location and interactions of solutes in microheterogeneous environments, such as reverse micelles, critically influence understanding of many phenomena that utilize probe molecules to characterize properties in chemical, biological, and physical systems. The information gained in such studies depends substantially on the location of the probe used. Often, intuition leads to the assumption that ionic probe molecules reside in the polar water pool of a system. In this work, the location of a charged polar transition metal coordination complex in a reverse micellar system is determined using NMR spectroscopy. Despite the expected Coulomb repulsion between the surfactant headgroups and the negatively charged complex, the complex spends significant time penetrating into the hydrophobic portion of the reverse micellar interface. These results challenge the assumption that ionic probe molecules reside solvated by water in microheterogeneous environments and suggest that probe molecule location be carefully considered before interpreting data from similar systems.
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Affiliation(s)
- Debbie C Crans
- Department of Chemistry, Colorado State University, Fort Collins, 80523-1872, USA.
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417
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Jakusch T, Gajda-Schrantz K, Adachi Y, Sakurai H, Kiss T, Horváth L. Solution equilibrium characterization of insulin-mimetic Zn(II) complexes. J Inorg Biochem 2006; 100:1521-6. [PMID: 16824606 DOI: 10.1016/j.jinorgbio.2006.05.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2005] [Revised: 04/19/2006] [Accepted: 05/10/2006] [Indexed: 10/24/2022]
Abstract
Solution speciation (stoichiometry and stability constants) of the insulin mimetic Zn(II) complexes of several bidentate ligands with (O,O), (N,O) or (S,O) coordination modes have been determined by pH-metry at 25 degrees Celsius and I=0.2M (KCl). All ligands were found to coordinate in a bidentate way forming mono, bis and tris complexes, besides a mixed hydroxo bis complex ZnL(2)(OH) detected in the slightly basic pH range together with the tris complex. Relationships between the stability data, lipophilicity of the complexes and earlier biological data are evaluated. The validity of the linear free energy relationships (LFER) between the proton and Zn(II) complexes and also between the VO(IV) and Zn(II) complexes is tested.
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Affiliation(s)
- T Jakusch
- Bioinorganic Chemistry Research Group of the Hungarian Academy of Sciences, University of Szeged, P.O. Box 440, H-6701 Szeged, Hungary
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418
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419
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Maurya MR, Kumar A, Abid M, Azam A. Dioxovanadium(V) and μ-oxo bis[oxovanadium(V)] complexes containing thiosemicarbazone based ONS donor set and their antiamoebic activity. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2006.02.032] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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420
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Dioxovanadium(V) Complexes Incorporating Tridentate ONO Donor Hydrazone Ligands Derived from Acetylhydrazide and 2-hydroxybenzaldehyde/2-hydroxyacetophenone. Synthesis, Characterization and Reactivity. TRANSIT METAL CHEM 2006. [DOI: 10.1007/s11243-006-0026-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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421
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Huang T, Cai S, Yu X, Chen Z. Investigation on the interactions between diperoxovanadate and substituted phenanthroline. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2006; 64:255-63. [PMID: 16098801 DOI: 10.1016/j.saa.2005.07.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2005] [Accepted: 07/04/2005] [Indexed: 05/04/2023]
Abstract
Detailed investigations were carried out to explore the interaction systems of NH4VO3/H2O2/5,6-dimethyl-1,10-phenanthroline and NH4VO3/H2O2/5-methyl-1,10-phenanthroline in aqueous solution under physiological conditions by NMR spectroscopy, such as 1D 1H, 13C, 51V variable temperature, and 2D COSY, NOESY, HETCOR, COLOC techniques as well as density functional calculations. New species [OV(O2)2(5,6-dimethyl-1,10-phenanthroline)]- and [OV(O2)2(5-methyl-1,10-phenanthroline)]- including isomers were formed in a bidentate coordination fashion which were stable under the experimental conditions. The solution structures of these new species were proposed based on the direct NMR experimental information and confirmed by the theoretical calculations. All the 1H and 13C NMR peaks were assigned. The calculated 1H and 13C chemical shifts on the whole are in fair agreement with the experimental values. The methyl groups on the aromatic ring of the three new complexes were found to have a steric hindrance effect on the coordination process. Experimental results show that the order of coordination capability of phenanthroline and its derivants was: 1,10-phenanthroline>5-methyl-1,10-phenanthroline>5,6-dimethyl-1,10-phenanthroline.
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Affiliation(s)
- Ting Huang
- Departments of Physics and Chemistry, State Key Laboratory of Physical Chemistry of Solid Surface, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
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422
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Kawabe K, Yoshikawa Y, Adachi Y, Sakurai H. Possible mode of action for insulinomimetic activity of vanadyl(IV) compounds in adipocytes. Life Sci 2006; 78:2860-6. [PMID: 16337244 DOI: 10.1016/j.lfs.2005.11.008] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2005] [Accepted: 11/07/2005] [Indexed: 11/22/2022]
Abstract
Vanadyl(IV) ions (+4 oxidation state of vanadium) and their complexes have been shown to have in vitro insulinomimetic activity and to be effective in treating animals with diabetes mellitus. Although, researchers have proposed many vanadyl compounds for the treatment of diabetes patients, the mode of action of vanadyl compounds remains controversial. In order to evaluate the mode of action of these compounds, we examined the insulinomimetic activity of VOSO4, bis(picolinato)oxovanadyl(IV), and bis(maltolato)oxovanadyl(IV) in the presence of several inhibitors relevant to the glucose metabolism. After confirming that these vanadyl compounds were incorporated in the adipocytes as estimated by ESR method, we evaluated the mode of action by examining free fatty acids (FFA) release in the adipocytes. Inhibition of FFA release by these vanadyl compounds was found to be reversed by the addition of inhibitors, typically by cytochalasin B (glucose transporter 4 (GLUT4) inhibitor), cilostamide (phosphodiesterase inhibitor), HNMPA-(AM)3 (tyrosine kinase inhibitor), and wortmannin (PI3-k inhibitor), indicating that these compounds affect primarily GLUT4 and phosphodiesterase, as named "ensemble mechanism". Based on these results, we suggest that vanadyl compounds act on at least four sites relevant to the glucose metabolism, and on GLUT4 and phosphodiesterase in particular in rat adipocytes, which in turn normalizes the blood glucose levels of diabetic animals. The obtained results provide evidence for the role of vanadyl ion and its complexes in stimulation of the uptake and degeneration of glucose.
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Affiliation(s)
- Kenji Kawabe
- Department of Analytical and Bioinorganic Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
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423
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Thompson KH, Barta CA, Orvig C. Metal complexes of maltol and close analogues in medicinal inorganic chemistry. Chem Soc Rev 2006; 35:545-56. [PMID: 16729148 DOI: 10.1039/b416256k] [Citation(s) in RCA: 105] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The family of hydroxypyrones and close congeners, the hydroxypyridinones, is a particularly versatile class of ligands. The most widely investigated for medicinal applications are the 3-hydroxy-4-pyrones and the 1,2- 3,2- and 3,4-hydroxypyridinones. Key features of these ligands are: a six-membered ring, with a ring N or O atom either ortho or para to a ketone group, and two ortho exocyclic oxygen atoms. Readily functionalizable, the hydroxypyrones and hydroxypyridinones allow one to achieve a range of di- and trivalent metallocomplex stabilities and can include tissue or molecular targeting features by design. Research over the past several decades has greatly expanded the array of ligands that are the subject of this critical review. Ligand applications as diverse as iron removal or supplementation, contrast agents in imaging applications, and mobilization of undesirable excess metal ions will be surveyed herein.
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Affiliation(s)
- Katherine H Thompson
- Medicinal Inorganic Chemistry Group, Chemistry Department, University of British Columbia, Vancouver, BC, Canada V6T 1Z1.
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424
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Browne WR, Ligtenbarg AGJ, de Boer JW, van den Berg TA, Lutz M, Spek AL, Hartl F, Hage R, Feringa BL. Electronic Properties, Redox Behavior, and Interactions with H2O2 of pH-Sensitive Hydroxyphenyl-1,2,4-triazole-Based Oxovanadium(V) Complexes. Inorg Chem 2006; 45:2903-16. [PMID: 16562946 DOI: 10.1021/ic051848x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The syntheses and spectroscopic characterization of two 1,2,4-triazole-based oxovanadium(V) complexes are reported: 1- [VO2L1]- and 2 [(VOL2)2(OMe)2] (where H2L1 = 3-(2'-hydroxyphenyl)-5-(pyridin-2' '-yl)-1H-1,2,4-triazole, H3L2 = bis-3,5-(2'-hydroxyphenyl)-1H-1,2,4-triazole). The ligand environment (N,N,O vs O,N,O) is found to have a profound influence on the properties and reactivity of the complexes formed. The presence of the triazolato ligand allows for pH tuning of the spectroscopic and electrochemical properties, as well as the interaction and stability of the complexes in the presence of hydrogen peroxide. The vanadium(IV) oxidation states were generated electrochemically and characterized by UV-vis and EPR spectroscopies. For 2, under acidic conditions, rapid exchange of the methoxide ligands with solvent [in particular, in the vanadium(IV) redox state] was observed.
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Affiliation(s)
- Wesley R Browne
- Department of Organic and Molecular Inorganic Chemistry, Stratingh Institute, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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425
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Spectroscopic and structural characterizations of water-soluble peroxo complexes of niobium(V) with N-containing heterocyclic ligands. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2005.12.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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426
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Jelveh KA, Zhande R, Brownsey RW. Inhibition of cyclic AMP dependent protein kinase by vanadyl sulfate. J Biol Inorg Chem 2006; 11:379-88. [PMID: 16506078 DOI: 10.1007/s00775-006-0087-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2005] [Accepted: 01/29/2006] [Indexed: 10/25/2022]
Abstract
Vanadium salts influence the activities of a number of mammalian enzymes in vitro but the mechanisms by which low concentrations of vanadium ameliorate the effects of diabetes in vivo remain poorly understood. The hypothesis that vanadium compounds act by inhibiting protein tyrosine phosphatases has attracted most support. The studies described here further evaluate the possibility that vanadyl sulfate trihydrate (VS) can also inhibit 3',5'-cyclic adenosine monophosphate (cAMP) dependent protein kinase (PKA). Using conventional assay conditions, VS inhibited PKA only at high concentrations (IC50>400 microM); however, PKA inhibition was seen at dramatically lower concentrations of VS (IC50<10 microM) when sequestration of vanadyl ions was minimized. Vanadyl appears to be the effective PKA inhibitor because sodium orthovanadate did not inhibit PKA and inhibition by vanadyl was abolished by potential chelators such as ethylenediaminetetraacetic acid or glycyl peptides. PKA inhibition by vanadyl appears to be mixed rather than strictly competitive or uncompetitive and may replicate the inhibitory effects of high concentrations of Mg2+. The effect of vanadyl on PKA provides a possible explanation for the effects of vanadium salts on fat tissue lipolysis and perhaps on other aspects of energy metabolism that are controlled by cAMP-dependent mechanisms. Considering the high degree of conservation of the active sites of protein kinases, vanadyl may also influence other members of this large protein family.
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Affiliation(s)
- Kioumars A Jelveh
- Department of Biochemistry and Molecular Biology, Life Sciences Institute, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC, Canada, V6T 1Z3
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427
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Maurya MR, Kumar A, Bhat AR, Azam A, Bader C, Rehder D. Dioxo- and Oxovanadium(V) Complexes of Thiohydrazone ONS Donor Ligands: Synthesis, Characterization, Reactivity, and Antiamoebic Activity. Inorg Chem 2006; 45:1260-9. [PMID: 16441138 DOI: 10.1021/ic050811+] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
As a contribution to the development of novel vanadium complexes with pharmacologically interesting properties, two neutral dioxovanadium(V) complexes [VO2(Hpydx-sbdt)] (1) and [VO2(Hpydx-smdt)] (3) [H2pydx-sbdt (I) and H2pydx-smdt (II) are the Schiff bases derived from pyridoxal and S-benzyl- or S-methyldithiocarbazate] have been synthesized by the reaction of [VO(acac)2] and the potassium salts of the ligands in methanol followed by aerial oxidation. Heating of the methanolic solutions of these complexes yields the oxo-bridged binuclear complexes [{VO(pydx-sbdt)}2mu-O] (2) and [{VO(pydx-smdt)}2mu-O] (4). The crystals and molecular structures of 1, 3 x 1.5H2O, and 4 x 2CH3OH have been determined, confirming the ONS binding mode of the dianionic ligands in their thioenolate form. The ring nitrogen of the pyridoxal moiety is protonated in complexes 1 and 3. Acidification of 1 and 3 with HCl dissolved in methanol afforded oxohydroxo complexes, while in a methanolic KOH solution, the corresponding dioxo species K[VO2(pydx-sbdt/smdt)] are formed. Treatment of 1 and 3 with H2O2 yields (unstable) oxoperoxovanadium(V) complexes, the formation of which has been established spectrophotometrically. In vitro antiamoebic activities (against HM1:1MSS strain of Entamoeba histolytica) were established for all of the dioxo- and oxovanadium(V) complexes. The complexes 1, 2, and 4 were more effective than metronidazole, a commonly used drug against amoebiasis, suggesting that oxovanadium(V) complexes derived from thiohydrazones may open a new dimension in the therapy of amoebiasis.
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Affiliation(s)
- Mannar R Maurya
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India.
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428
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Correia I, Dornyei A, Avecilla F, Kiss T, Costa Pessoa J. X-ray Crystal Structure and Characterization in Aqueous Solution of{N,N′-Ethylenebis(pyridoxylaminato)}zinc(II). Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200500623] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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429
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Broderick TL, Bailey J, Gagnon KJ, Lord SJ, Vogels CM, Westcott SA. Effect of a Novel Molybdenum Ascorbate Complex on Ex Vivo Myocardial Performance in Chemical??Diabetes Mellitus. Drugs R D 2006; 7:119-25. [PMID: 16542058 DOI: 10.2165/00126839-200607020-00006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
BACKGROUND The insulin-like action of metal complexes on target tissues, including the heart, has been reported in experimental diabetes mellitus. Since streptozotocin-induced diabetes is associated with insulin deficiency and left ventricular dysfunction, this study was designed to determine whether the novel metal complex molybdenum ascorbate [MoO(2)(aa)(2)] would improve cardiac function in this model of diabetes. METHODS Diabetes was induced in Sprague-Dawley rats (n = 6) following an intravenous injection of streptozotocin (60 mg/kg). After 8 weeks of diabetes, cardiac function was determined in isolated working hearts perfused with 11 mmol/L glucose, 1.2 mmol/L palmitate and 3% albumin. MoO(2)(aa)(2 )was added directly into the perfusate of working hearts at a concentration of 200 micromol/L for a period of 30 minutes. Age-matched control rats served as controls (n = 6). RESULTS Cardiac function, expressed as heart rate (HR) and aortic flow, was significantly decreased in diabetic hearts compared with control hearts. The diabetic state was associated with 23% and 60% reductions in HR and aortic flow, respectively. Short-term addition of MoO(2)(aa)(2) was beneficial and partially prevented the attenuation in diabetic rat heart function. MoO(2)(aa)(2 )increased HR by 15%, while aortic flow was increased by 85%. In control hearts, MoO(2)(aa)(2) had no effect on HR and increased aortic flow by 12%. CONCLUSION This study extends previous observations on the benefit of metal complexes in experimental diabetes. Our results indicate that short-term treatment with MoO(2)(aa)(2) partially reversed the left ventricular dysfunction associated with the streptozotocin model of diabetes.
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Affiliation(s)
- Tom L Broderick
- Department of Physiology, Midwestern University, Glendale, Arizona 85308, USA.
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430
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Aqueous acid–base chemistry involving dioxovanadium(V) complexes of 2,6-pyridinedimethanol, and the X-ray structures of Na[VO2{2,6-(OCH2)2NC5H3}]·4H2O and [1-H-2,6-(HOCH2)2NC5H3]+Cl−. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2005.07.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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431
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Brayton D, Jacobsen FE, Cohen SM, Farmer PJ. A novel heterocyclic atom exchange reaction with Lawesson's reagent: a one-pot synthesis of dithiomaltol. Chem Commun (Camb) 2006:206-8. [PMID: 16372107 DOI: 10.1039/b511966a] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A one-pot reaction of maltol with Lawesson's reagent generates dithiomaltol, a thiopyran-4-thione, via an unusual heterocyclic atom exchange (HCAE) reaction; only pyrones with proton or aliphatic substituents undergo the HCAE substitution.
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Affiliation(s)
- Daniel Brayton
- Department of Chemistry, University of California, Irvine, CA 92697-2025, USA
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432
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Zhou YZ, Chen RJ, Tu SJ, Lu XM. Synthesis and Crystal Structure of a New Oxovanadium(V)Multicomponent Complex with Acylhydrazone and Benzoylhydrazine. CHINESE J CHEM 2006. [DOI: 10.1002/cjoc.200690014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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433
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Thompson KH, Orvig C. Metal complexes in medicinal chemistry: new vistas and challenges in drug design. Dalton Trans 2006:761-4. [PMID: 16437168 DOI: 10.1039/b513476e] [Citation(s) in RCA: 226] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An overview is presented of selected metal-based pharmaceuticals, either diagnostic or therapeutic, with emphasis on specific attributes and in vivo interactions of these compounds relevant to their use in medicinal applications. Both the advantages and the challenges of this approach are outlined, with possibilities for future developments accentuated.
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Affiliation(s)
- Katherine H Thompson
- Medicinal Inorganic Chemistry Group, Department of Chemistry, University of British Columbia, Vancouver, BC, Canada V6T 1Z1
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434
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Sessler JL, Tomat E, Lynch VM. Coordination of oxovanadium(v) in an expanded porphyrin macrocycle. Chem Commun (Camb) 2006:4486-8. [PMID: 17283793 DOI: 10.1039/b608143f] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The formation of a dioxovanadium(V) complex of an expanded porphyrin-type Schiff base macrocycle is reported; the tetrapyrrolic ligand undergoes a tautomeric shift which permits a bimodal recognition of the nonspherical cationic guest.
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Affiliation(s)
- Jonathan L Sessler
- Department of Chemistry and Biochemistry, I University Station, The University of Texas at Austin, Austin, TX, USA.
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435
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Maurya MR, Agarwal S, Abid M, Azam A, Bader C, Ebel M, Rehder D. Synthesis, characterisation, reactivity and in vitro antiamoebic activity of hydrazone based oxovanadium(iv), oxovanadium(v) and µ-bis(oxo)bis{oxovanadium(v)} complexes. Dalton Trans 2006:937-47. [PMID: 16462954 DOI: 10.1039/b512326g] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Binuclear, mu-bis(oxo)bis{oxovanadium(V)} complexes [(VOL)2(mu-O)2](2 and 7)(where HL are the hydrazones Hacpy-nah I or Hacpy-fah II; acpy = 2-acetylpyridine, nah = nicotinic acid hydrazide and fah = 2-furoic acid hydrazide) were prepared by the reaction of [VO(acac)2] and the ligands in methanol followed by aerial oxidation. The paramagnetic intermediate complexes [VO(acac)(acpy-nah)](1) and [VO(acac)(acpy-fah)](6) have also been isolated. Treatment of [VO(acac)(acpy-nah)] and [VO(acac)(acpy-fah)] with aqueous H2O2 yields the oxoperoxovanadium(V) complexes [VO(O2)(acpy-nah)](3) and [VO(O2)(acpy-fah)](8). In the presence of catechol (H2cat) or benzohydroxamic acid (H2bha), 1 and 6 give the mixed chelate complexes [VO(cat)L](HL =I: 4, HL =II: 9) or [VO(bha)L](HL =I: 5, HL =II: 10). Complexes 4, 5, 9 and 10 slowly convert to the corresponding oxo-mu-oxo species 2 and 7 in DMF solution. Ascorbic acid enhances this conversion under aerobic conditions, possibly through reduction of these complexes with concomitant removal of coordinated catecholate or benzohydroxamate. Acidification of 7 with HCl dissolved in methanol afforded a hydroxo(oxo) complex. The crystal and molecular structure of 2.1.5H2O has been determined, and the structure of 7 re-determined, by single crystal X-ray diffraction. Both of these binuclear complexes contain the uncommon asymmetrical {VO(mu-O)}2 diamond core. The in vitro tests of the antiamoebic activity of ligands I and II and their binuclear complexes 2 and 7 against the protozoan parasite Entamoeba histolytica show that the ligands have no amoebicidal activity while their vanadium complexes 2 and 7 display more effective amoebicidal activity than the most commonly used drug metronidazole (IC50 values are 1.68 and 0.45 microM, respectively vs 1.81 microM for metronidazole). Complexes 2 and 7 catalyse the oxidation of styrene and ethyl benzene effectively. Oxidation of styrene, using H2O2 as an oxidant, gives styrene epoxide, 2-phenylacetaldehyde, benzaldehyde, benzoic acid and 1-phenyl-ethane-1,2-diol, while ethyl benzene yields benzyl alcohol, benzaldehyde and 1-phenyl-ethane-1,2-diol.
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Affiliation(s)
- Mannar R Maurya
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India.
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436
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MacDonald K, Bailey J, MacRory C, Friis C, Vogels CM, Broderick T, Westcott SA. A Newly Synthesised Molybdenum/Ascorbic Acid Complex Alleviates Some Effects of Cardiomyopathy in Streptozocin-Induced Diabetic Rats. Drugs R D 2006; 7:33-42. [PMID: 16620135 DOI: 10.2165/00126839-200607010-00003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
BACKGROUND Exogenous insulin does not prevent cardiac failure in patients with type 1 diabetes mellitus and a cardioprotective insulin mimic is greatly needed. Certain transition metals are known to act as insulin mimics and may be cardio- protective. In this study, the ability of a newly synthesised molybdenum/ascorbic acid complex to strengthen cardiac function was investigated. METHODS AND DESIGN Male CD rats were assigned to one of five groups: non-diabetic control, non-diabetic control treated with molybdenum/ascorbic acid complex, diabetic treated with sodium ascorbate, diabetic treated with molybdenum/ascorbic acid complex and untreated diabetics. Type 1 diabetes was induced by streptozocin injection. Once diabetes was confirmed, treatment was initiated by adding either the molybdenum/ascorbic acid complex or sodium ascorbate to the drinking water and continued for 6 weeks. Following the treatment period, the animals were terminated, and their hearts were excised and mounted in a working heart perfusion apparatus. Blood samples were taken for plasma glucose and plasma lipid level determination. Cardiac function was evaluated using 1 hour of low-flow ischaemic stress followed by 30 minutes of reperfusion. RESULTS Hearts from the animals treated with the molybdenum/ascorbic acid complex displayed the best aerobic performance of all the diabetic animals. Blood glucose levels and blood lipid levels were significantly lower in animals treated with the complex than in other diabetic animals. The group treated with the complex also had a lower drinking rate than the other diabetic groups. Furthermore, hearts from animals treated with the molybdenum/ascorbic acid complex showed a greater degree of recovery from low-flow ischaemia than any other group. CONCLUSIONS The molybdenum/ascorbic acid complex showed some significant insulin-mimic and cardioprotective effects. Further development of this complex could provide a drug useful for alleviating some of the cardiovascular problems associated with diabetes mellitus.
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Affiliation(s)
- K MacDonald
- Department of Biology, Mount Allison University, Sackville, New Brunswick, Canada
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437
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Schlindwein W, Waltham E, Burgess J, Binsted N, Nunes A, Leite A, Rangel M. New lipophilic 3-hydroxy-4-pyridinonate iron(III) complexes: synthesis and EXAFS structural characterisation. Dalton Trans 2005:1313-21. [PMID: 16505910 DOI: 10.1039/b509671e] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
New tris-iron(III) chelates of 3-hydroxy-4-pyridinone ligands derived from maltol (3-hydroxy-2-methyl-4-pyrone) or ethylmaltol (2-ethyl-3-hydroxy-4-pyrone), including a variety of N-aryl (phenyl, 4'-tolyl, 4'-(n-butyl)phenyl, 4'-(n-hexyl)phenyl) and N-benzyl (4'-methylbenzyl, 4'-fluorobenzyl and 4'-(trifluoromethyl)benzylamine) substituents on the nitrogen atom of the pyridinone ring, have been prepared. Characterization by C,H,N elemental analysis and thermogravimetric measurements indicates that most of the complexes are obtained as hydrates of general formula ML3.xH2O. Structural characterization of these difficult to crystallize lipophilic complexes has been achieved by EXAFS spectroscopy. Solutions of iron(III) complexes of maltol, ethylmaltol, 1,2-dimethyl-3-hydroxy-4-pyridinone and 1-phenyl-2-methyl-3-hydroxy-4-pyridinone in methanol-water mixtures were also examined by EXAFS. Distances from the central atom to ligand atoms, within 6 A of the metal, have been determined in the solid and solution samples and the results show that the structure observed in the powder is maintained in solution. The local structure around the metal centre, bond distances and bond angles, does not change significantly with variable lipophilicity, thus indicating that ligands may be tailored according to specific needs without altering their chelation properties. EXAFS data analysis for this set of tris-iron(III) compounds illustrates the important contribution of both intra-ligand and inter-ligand multiple scattering pathways through the metal centre to a peak observed in the FT spectrum at twice the metal ligand distance (approximately 4 A). The present results demonstrate that EXAFS features at twice the metal-ligand distance are valuable in the assignment of molecular geometry and that location of hydration water molecules, by EXAFS analysis, is limited by the geometry of the complexes, in particular for those in which ligands containing phenyl rings are present.
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438
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Cao Y, Zhang H, Huang C, Yang Q, Chen Y, Sun R, Zhang F, Guo W. Synthesis, crystal structure and two-dimensional infrared correlation spectroscopy of a layer-like transition metal (TM)-oxalate templated polyoxovanadium borate. J SOLID STATE CHEM 2005. [DOI: 10.1016/j.jssc.2005.09.017] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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439
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Mohammadi K, Thompson KH, Patrick BO, Storr T, Martins C, Polishchuk E, Yuen VG, McNeill JH, Orvig C. Synthesis and characterization of dual function vanadyl, gallium and indium curcumin complexes for medicinal applications. J Inorg Biochem 2005; 99:2217-25. [PMID: 16171869 DOI: 10.1016/j.jinorgbio.2005.08.001] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2005] [Revised: 07/19/2005] [Accepted: 08/08/2005] [Indexed: 10/25/2022]
Abstract
Novel bis[4-hydroxy-3-methoxyphenyl]-1,6-heptadiene-3,5-dione (curcumin) complexes with the formula, ML(3), where M is Ga(III) or In(III), or of the formula, ML(2) where M is [VO](2+), have been synthesized and characterized by mass spectrometry, infrared and absorption spectroscopies, and elemental analysis. A new ligand, bis[4-acetyl-3-hydroxyphenyl]-1,6-heptadiene-3,5-dione (diacetylbisdemethoxycurcumin, DABC) was similarly characterized; an X-ray structure analysis was performed. Vanadyl complexes tested in an acute i.p. testing protocol in STZ-diabetic rats showed a lack of insulin enhancing potential. Vanadyl complexes were, however, more cytotoxic than were the ligands alone in standard MTT (3-[4,5-dimethylthiazole-2-yl]ate, -2,5-diphenyl-tetrazolium bromide) cytotoxicity testing, using mouse lymphoma cells. With the exception of DABC, that was not different from VO(DABC)(2), the complexes were not significantly different from one another, with IC(50) values in the 5-10 microM range. Gallium and indium curcumin complexes had IC(50) values in the same 5-10 microM range; whereas Ga(DAC)(3) and In(DAC)(3) (where DAC=diacetylcurcumin) were much less cytotoxic (IC(50)=20-30 microM). Antioxidant capacity was decreased in VO(DAC)(2), Ga(DAC)(3), and In(DAC)(3), compared to vanadyl, gallium and indium curcumin, corroborating the importance of curcumin's free phenolic OH groups for scavenging oxidants, and correlated with reduced cytotoxic potential.
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Affiliation(s)
- Khosro Mohammadi
- Medicinal Inorganic Chemistry Group, Chemistry Department, University of British Columbia, Vancouver, BC, Canada V6T 1Z1
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440
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Delgado TC, Tomaz AI, Correia I, Costa Pessoa J, Jones JG, Geraldes CFGC, Castro MMCA. Uptake and metabolic effects of insulin mimetic oxovanadium compounds in human erythrocytes. J Inorg Biochem 2005; 99:2328-39. [PMID: 16226808 DOI: 10.1016/j.jinorgbio.2005.08.014] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2005] [Revised: 08/01/2005] [Accepted: 08/26/2005] [Indexed: 11/26/2022]
Abstract
The uptake of the oxidation products of two oxovanadium(IV) compounds, [N,N'-ethylenebis(pyridoxylaminato)]oxovanadium(IV), V(IV)O(Rpyr(2)en), and bis-[3-hydroxy-1,2-dimethyl-4-pyridinonato]oxovanadium(IV), V(IV)O(dmpp)(2), by human erythrocytes was studied using (51)V and (1)H NMR and EPR spectroscopy. V(IV)O(Rpyr(2)en) in aerobic aqueous solution is oxidized to its V(V) counterpart and the neutral form slowly enters the cells by passive diffusion. In aerobic conditions, V(IV)O(dmpp)(2) originates V(V) complexes of 1:1 and 1:2 stoichiometry. The neutral 1:1 species is taken up by erythrocytes through passive diffusion in a temperature-dependent process; its depletion from the extracellular medium promotes the dissociation of the negatively charged 1:2 species, and the protonation of the negatively charged 1:1 species. The identity of these complexes is not maintained inside the cells, and the intracellular EPR spectra suggest N(2)O(2) or NO(3) intracellular coordinating environments. The oxidative stress induced by the oxovanadium compounds in erythrocytes was not significant at 1mM concentration, but was increased by both vanadate and oxidized V(IV)O(dmpp)(2) at 5mM. Only 1mM oxidized V(IV)O(dmpp)(2) significantly stimulated erythrocytes glucose intake (0.75+/-0.13 against 0.37+/-0.17mM/h found for the control, p<0.05).
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Affiliation(s)
- Teresa C Delgado
- Department of Biochemistry, Center of NMR Spectroscopy and Center for Neurosciences and Cell Biology, University of Coimbra, P.O. Box 3126, 3001-401 Coimbra, Portugal
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441
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Yu XY, Cai SH, Chen Z. Investigation on the complex of diperoxovanadate with 2-(2′-pyridyl)-imidazole. J Inorg Biochem 2005; 99:1945-51. [PMID: 16043221 DOI: 10.1016/j.jinorgbio.2005.06.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2005] [Revised: 05/21/2005] [Accepted: 06/10/2005] [Indexed: 11/17/2022]
Abstract
A novel diperoxovanadate complex NH4[OV(O2)2{2-(2'-pyridyl)-imidazole}] x 4H2O was synthesized in aqueous solution under physiological conditions. The solution structure of the complex was characterized by multinuclear (1H, 13C, 14N, and 51V) as well as multi-dimensional (DOSY and C-H COSY) NMR techniques in the interaction system of NH4VO3/H2O2/2-(2'-pyridyl)-imidazole at room temperature. The crystal structure of the complex was determined at 173K by single-crystal X-ray diffraction method. It belongs to the monoclinic space group P21/c with a = 13.048(4), b = 6.984(2), c = 17.814(5) A, beta = 104.695(5), V = 1570.3(8) A3 and Z = 4. The crystal is composed of ammonium ions, {2-(2'-pyridyl)-imidazole}oxodiperoxovanadate(V) ions, and water molecules, which are held together by ionic and hydrogen bond forces. The metal atom in the complex is seven-coordinated with a distorted pentagonal bipyramidal geometry. It is the first mononuclear diperoxovanadate complex with a N, N'-chelating biheteroaromatic ligand and its 51V chemical shift is at the highest field among the known mononuclear diperoxovanadate(V) complexes.
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Affiliation(s)
- Xian-Yong Yu
- Department of Physics, State Key Laboratory of Physical Chemistry of Solid Surface, Xiamen University, Xiamen, Fujian, 361005, PR China
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442
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Saha TK, Adachi Y, Yoshikawa Y, Yasui H, Sakurai H. A New Type of Orally Active Insulin-mimetic Vanadyl-porphyrin Complex:meso-Tetrakis({4-sulfonatophenyl}porphyrinato)oxovanadium(IV). CHEM LETT 2005. [DOI: 10.1246/cl.2005.1350] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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443
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Bayot D, Devillers M, Peeters D. Vibrational Spectra of Eight-Coordinate Niobium and Tantalum Complexes with Peroxo Ligands: A Theoretical Simulation. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200500428] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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444
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Zhang QZ, Lu CZ, Yang WB. Synthesis and Structure of a New Vanadium(IV)-Cadmium(II) Compound with the Nitrilotriacetate Ligand: {(NH4)2[(VIVO)2(μ2-O)(nta)2Cd(H2O)2]·H2O}n. Z Anorg Allg Chem 2005. [DOI: 10.1002/zaac.200500147] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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445
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Vrdoljak V, Cindrić M, Milić D, Matković-Čalogović D, Novak P, Kamenar B. Synthesis of five new molybdenum(VI) thiosemicarbazonato complexes. Crystal structures of salicylaldehyde and 3-methoxy-salicylaldehyde 4-methylthiosemicarbazones and their molybdenum(VI) complexes. Polyhedron 2005. [DOI: 10.1016/j.poly.2005.05.002] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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446
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Complexation between vanadium (V) and phenyllactate: Synthesis, spectral studies and crystal structure of (NEt4)(NH4)3[V2O2(O2)2(R-3-phlact)2][V2O2(O2)2(S-3-phlact)2]·6H2O, [3-phlact=3-phenyllactato(2−)]. Inorganica Chim Acta 2005. [DOI: 10.1016/j.ica.2005.06.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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447
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Shi W, Chen XY, Zhao YN, Zhao B, Cheng P, Yu A, Song HB, Wang HG, Liao DZ, Yan SP, Jiang ZH. Synthesis, Crystal Structures, and Properties of Oxovanadium(IV)-Lanthanide(III) Heteronuclear Complexes. Chemistry 2005; 11:5031-9. [PMID: 15973746 DOI: 10.1002/chem.200500086] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A new series of oxovanadium(IV)-lanthanide(III) heteronuclear complexes [Yb(H2O)8]2[(VO)2(TTHA)](3)21 H2O (1), {[Ho(H2O)7(VO)2(TTHA)][(VO)2(TTHA)](0.5)} 8.5 H2O (2), {[Gd(H2O)7(VO)2(TTHA)][(VO)2(TTHA)](0.5)}8.5 H2O (3), {[Eu(H2O)7][(VO)2(TTHA)](1.5)} 10.5 H2O (4), and [Pr2(H2O)6(SO4)2][(VO)2(TTHA)] (5) (H6TTHA=triethylenetetraaminehexaacetic acid) were prepared by using the bulky flexible organic acid H(6)TTHA as structure-directing agent. X-ray crystallographic studies reveal that they contain the same [(VO)2(TTHA)]2- unit as building block, but the Ln3+ ion lies in different coordination environments. Although the lanthanide ions always exhibit similar chemical behavior, the structures of the complexes are not homologous. Compound 1 is composed of a [Yb(H2O)8]3+ ion and a [(VO)2(TTHA)]2- ion. Compounds 2 and 3 are isomorphous; both contain a trinuclear [Ln(H2O)7(VO)2(TTHA)]+ (Ln=Ho for 2 and Gd for 3) ion and a [(VO)2(TTHA)]2- ion. Compound 4 is an extended one-dimensional chain, in which each Eu3+ ion links two [(VO)2(TTHA)]2- ions. For 5, the structure is further assembled into a three-dimensional network with an interesting framework topology comprising V2Pr2 and V4Pr2 heterometallic lattices. Moreover, 4 and 5 are the first oxovanadium(IV)-lanthanide(III) coordination polymers and thus enlarge the realm of 3d-4f complexes. The IR, UV/Vis, and EPR spectra and the magnetic properties of the heterometallic complexes were studied. Notably, 2 shows unusual ferromagnetic interactions between the VO2+ and Ho3+ ions.
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Affiliation(s)
- Wei Shi
- Department of Chemistry, Nankai University, Tianjin 300071, P.R. China
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dos Santos Claro PC, González-Baró AC, Parajón-Costa BS, Baran EJ. Spectroscopic and Electrochemical Behavior of the Methyl and Ethyl Derivatives of Bis(acetylacetonato) oxovanadium(IV). Z Anorg Allg Chem 2005. [DOI: 10.1002/zaac.200500123] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Stover J, Rithner CD, Inafuku RA, Crans DC, Levinger NE. Interaction of dipicolinatodioxovanadium(V) with polyatomic cations and surfaces in reverse micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:6250-8. [PMID: 15982027 DOI: 10.1021/la0508137] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
In confined media such as reverse micelles, molecular probes frequently reside at and interact strongly with the interface. If the interface is charged, it is often difficult to separate effects arising from interactions with the charged species from the effect of the interfacial environment. With reverse micelles as a model system, the work reported here explores the interaction of the charged surfactant headgroups at a self-assembled interface with the dipicolinatodioxovanadium(V) coordination complex. The vanadium complex studied in these experiments serves as an excellent probe to investigate how charged metal complexes interact with lipid interfaces. For comparison, measurements were also carried out probing the interaction of the vanadium complex with a model cationic headgroup, tetramethylammonium bromide. The impact of the environment is gauged by changes in the 51V chemical shift, longitudinal relaxation times, and 1H NMR pulsed field gradient measurements. These measurements suggest that while interface component parts, as modeled by the dispersed systems, interact with the vanadium complex, the interfacial environment perturbs the complex substantially more strongly than the sum of the components alone. Coulomb attraction dominates the interaction in all systems probed and surprisingly orients the hydrophobic portion into the bulk water.
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Affiliation(s)
- Jessica Stover
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, USA
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