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Reeve EH, Kronquist EK, Wolf JR, Lee B, Khurana A, Pham H, Cullen AE, Peterson JA, Meza A, Colton Bramwell R, Villasana L, Machin DR, Henson GD, Walker AE. Pyridoxamine treatment ameliorates large artery stiffening and cerebral artery endothelial dysfunction in old mice. J Cereb Blood Flow Metab 2023; 43:281-295. [PMID: 36189840 PMCID: PMC9903220 DOI: 10.1177/0271678x221130124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Age-related increases in large artery stiffness are associated with cerebrovascular dysfunction and cognitive impairment. Pyridoxamine treatment prevents large artery stiffening with advancing age, but the effects of pyridoxamine treatment on the cerebral vasculature or cognition is unknown. The purpose of this study was to investigate the effects of pyridoxamine on blood pressure, large artery stiffness, cerebral artery function, and cognitive function in old mice. Old male C57BL/6 mice consumed either pyridoxamine (2 g/L) or vehicle control in drinking water for ∼7.5 months and were compared with young male C57BL/6 mice. From pre- to post-treatment, systolic blood pressure increased in old control mice, but was maintained in pyridoxamine treated mice. Large artery stiffness decreased in pyridoxamine-treated mice but was unaffected in control mice. Pyridoxamine-treated mice had greater cerebral artery endothelium-dependent dilation compared with old control mice, and not different from young mice. Old control mice had impaired cognitive function; however, pyridoxamine only partially preserved cognitive function in old mice. In summary, pyridoxamine treatment in old mice prevented age-related increases in blood pressure, reduced large artery stiffness, preserved cerebral artery endothelial function, and partially preserved cognitive function. Taken together, these results suggest that pyridoxamine treatment may limit vascular aging.
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Affiliation(s)
- Emily H Reeve
- Department of Human Physiology, 3265, University of Oregon, Eugene, OR, USA
| | - Elise K Kronquist
- Department of Human Physiology, 3265, University of Oregon, Eugene, OR, USA
| | - Julia R Wolf
- Department of Human Physiology, 3265, University of Oregon, Eugene, OR, USA
| | - Byron Lee
- Department of Human Physiology, 3265, University of Oregon, Eugene, OR, USA
| | - Aleena Khurana
- Department of Human Physiology, 3265, University of Oregon, Eugene, OR, USA
| | - Hanson Pham
- Department of Human Physiology, 3265, University of Oregon, Eugene, OR, USA
| | - Abigail E Cullen
- Department of Human Physiology, 3265, University of Oregon, Eugene, OR, USA
| | - Jessica A Peterson
- Department of Human Physiology, 3265, University of Oregon, Eugene, OR, USA
| | - Antonio Meza
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
| | - R Colton Bramwell
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
| | | | - Daniel R Machin
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
- Department of Nutrition and Integrative Physiology, 7823, Florida State University, Tallahassee, FL, USA
| | - Grant D Henson
- Department of Human Physiology, 3265, University of Oregon, Eugene, OR, USA
| | - Ashley E Walker
- Department of Human Physiology, 3265, University of Oregon, Eugene, OR, USA
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
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2
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Zakharchenko A, Rock CA, Thomas TE, Keeney S, Hall EJ, Takano H, Krieger AM, Ferrari G, Levy RJ. Inhibition of advanced glycation end product formation and serum protein infiltration in bioprosthetic heart valve leaflets: Investigations of anti-glycation agents and anticalcification interactions with ethanol pretreatment. Biomaterials 2022; 289:121782. [PMID: 36099713 PMCID: PMC10015409 DOI: 10.1016/j.biomaterials.2022.121782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 08/22/2022] [Accepted: 08/29/2022] [Indexed: 11/16/2022]
Abstract
Bioprosthetic heart valves (BHV) fabricated from heterograft tissue, such as glutaraldehyde pretreated bovine pericardium (BP), are the most frequently used heart valve replacements. BHV durability is limited by structural valve degeneration (SVD), mechanistically associated with calcification, advanced glycation end products (AGE), and serum protein infiltration. We investigated the hypothesis that anti-AGE agents, Aminoguanidine, Pyridoxamine [PYR], and N-Acetylcysteine could mitigate AGE-serum protein SVD mechanisms in vitro and in vivo, and that these agents could mitigate calcification or demonstrate anti-calcification interactions with BP pretreatment with ethanol. In vitro, each of these agents significantly inhibited AGE-serum protein infiltration in BP. However, in 28-day rat subdermal BP implants only orally administered PYR demonstrated significant inhibition of AGE and serum protein uptake. Furthermore, BP PYR preincubation of BP mitigated AGE-serum protein SVD mechanisms in vitro, and demonstrated mitigation of both AGE-serum protein uptake and reduced calcification in vivo in 28-day rat subdermal BP explants. Inhibition of BP calcification as well as inhibition of AGE-serum protein infiltration was observed in 28-day rat subdermal BP explants pretreated with ethanol followed by PYR preincubation. In conclusion, AGE-serum protein and calcification SVD pathophysiology are significantly mitigated by both PYR oral therapy and PYR and ethanol pretreatment of BP.
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Affiliation(s)
- Andrey Zakharchenko
- The Pediatric Heart Valve Center, Division of Cardiology, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA
| | - Christopher A Rock
- The Pediatric Heart Valve Center, Division of Cardiology, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA
| | - Tina E Thomas
- The Pediatric Heart Valve Center, Division of Cardiology, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA
| | - Samuel Keeney
- The Pediatric Heart Valve Center, Division of Cardiology, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA
| | - Emily J Hall
- The Pediatric Heart Valve Center, Division of Cardiology, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA
| | - Hajime Takano
- Division of Neurology, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA
| | - Abba M Krieger
- Department of Statistics, The Wharton School, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Giovanni Ferrari
- Departments of Surgery and Biomedical Engineering, Columbia University, New York, NY, 10032, USA
| | - Robert J Levy
- The Pediatric Heart Valve Center, Division of Cardiology, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA.
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Complexes of Copper and Iron with Pyridoxamine, Ascorbic Acid, and a Model Amadori Compound: Exploring Pyridoxamine's Secondary Antioxidant Activity. Antioxidants (Basel) 2021; 10:antiox10020208. [PMID: 33535448 PMCID: PMC7912584 DOI: 10.3390/antiox10020208] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Revised: 01/23/2021] [Accepted: 01/26/2021] [Indexed: 12/28/2022] Open
Abstract
The thermodynamic stability of 11 complexes of Cu(II) and 26 complexes of Fe(III) is studied, comprising the ligands pyridoxamine (PM), ascorbic acid (ASC), and a model Amadori compound (AMD). In addition, the secondary antioxidant activity of PM is analyzed when chelating both Cu(II) and Fe(III), relative to the rate constant of the first step of the Haber-Weiss cycle, in the presence of the superoxide radical anion (O2•-) or ascorbate (ASC-). Calculations are performed at the M05(SMD)/6-311+G(d,p) level of theory. The aqueous environment is modeled by making use of the SMD solvation method in all calculations. This level of theory accurately reproduces the experimental data available. When put in perspective with the stability of various complexes of aminoguanidine (AG) (which we have previously studied), the following stability trends can be found for the Cu(II) and Fe(III) complexes, respectively: ASC < AG < AMD < PM and AG < ASC < AMD < PM. The most stable complex of Cu(II) with PM (with two bidentate ligands) presents a ΔGf0 value of -35.8 kcal/mol, whereas the Fe(III) complex with the highest stability (with three bidentate ligands) possesses a ΔGf0 of -58.9 kcal/mol. These complexes can significantly reduce the rate constant of the first step of the Haber-Weiss cycle with both O2•- and ASC-. In the case of the copper-containing reaction, the rates are reduced up to 9.70 × 103 and 4.09 × 1013 times, respectively. With iron, the rates become 1.78 × 103 and 4.45 × 1015 times smaller, respectively. Thus, PM presents significant secondary antioxidant activity since it is able to inhibit the production of ·OH radicals. This work concludes a series of studies on secondary antioxidant activity and allows potentially new glycation inhibitors to be investigated and compared relative to both PM and AG.
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García-Díez G, Mora-Diez N. Theoretical Study of the Iron Complexes with Aminoguanidine: Investigating Secondary Antioxidant Activity. Antioxidants (Basel) 2020; 9:E756. [PMID: 32824195 PMCID: PMC7463863 DOI: 10.3390/antiox9080756] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 08/02/2020] [Accepted: 08/11/2020] [Indexed: 12/27/2022] Open
Abstract
A thorough analysis of the thermodynamic stability of various complexes of aminoguanidine (AG) with Fe(III) at a physiological pH is presented. Moreover, the secondary antioxidant activity of AG is studied with respect to its kinetic role in the Fe(III) reduction to Fe(II) when reacting with the superoxide radical anion or ascorbate. Calculations are performed at the M05(SMD)/6-311+G(d,p) level of theory. Solvent effects (water) are taken into account in both geometry optimizations and frequency calculations employing the SMD solvation method. Even though the results of this study show that AG can form an extensive number of stable complexes with Fe(III), none of these can reduce the rate constant of the initial step of the Haber-Weiss cycle when the reducing agent is O2•-. However, when the reductant is the ascorbate anion, AG is capable of reducing the rate constant of this reaction significantly, to the point of inhibiting the production of •OH radicals. In fact, the most stable complex of Fe(III) with AG, having a ∆Gf° of -37.9 kcal/mol, can reduce the rate constant of this reaction by 7.9 × 105 times. Thus, AG possesses secondary antioxidant activity relative to the Fe(III)/Fe(II) reduction with ascorbate, but not with O2•-. Similar results have also been found for AG relative to the Cu(II)/Cu(I) reduction, in agreement with experimental results.
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Affiliation(s)
| | - Nelaine Mora-Diez
- Department of Chemistry, Thompson Rivers University, Kamloops, BC V2C 0C8, Canada;
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García-Díez G, Ramis R, Mora-Diez N. Theoretical Study of the Copper Complexes with Aminoguanidine: Investigating Secondary Antioxidant Activity. ACS OMEGA 2020; 5:14502-14512. [PMID: 32596588 PMCID: PMC7315568 DOI: 10.1021/acsomega.0c01175] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 05/28/2020] [Indexed: 06/11/2023]
Abstract
A systematic study of the thermodynamic stability of various Cu(II) complexes with aminoguanidine (AG) is performed, together with the study of its secondary antioxidant activity. Calculations have been carried out at the M05(SMD)/6-311+G(d,p) level of theory using water as the solvent. The results obtained indicate that AG is capable of forming a wide array of stable coordination compounds with Cu(II) under physiological pH conditions, and it possesses some degree of secondary antioxidant activity when coordinating to copper. The most thermodynamically stable complex can slow down 2.8 times the first step of the Haber-Weiss cycle (from 7.71 × 109 to 2.80 × 109 M-1 s-1) and slightly reduce the potential damage that the formation of •OH radicals can cause. The results of this research add to previous knowledge on this molecule, which could be used as a potential glycation inhibitor.
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Affiliation(s)
- Guillermo García-Díez
- Department
of Chemistry, Thompson Rivers University, Kamloops, British Columbia V2C 0C8, Canada
| | - Rafael Ramis
- Departament
de Química, Universitat de les Illes
Balears, Palma de Mallorca 07122, Spain
| | - Nelaine Mora-Diez
- Department
of Chemistry, Thompson Rivers University, Kamloops, British Columbia V2C 0C8, Canada
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Ramis R, Ortega-Castro J, Caballero C, Casasnovas R, Cerrillo A, Vilanova B, Adrover M, Frau J. How Does Pyridoxamine Inhibit the Formation of Advanced Glycation End Products? The Role of Its Primary Antioxidant Activity. Antioxidants (Basel) 2019; 8:E344. [PMID: 31480509 PMCID: PMC6770850 DOI: 10.3390/antiox8090344] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 08/16/2019] [Accepted: 08/22/2019] [Indexed: 12/28/2022] Open
Abstract
Pyridoxamine, one of the natural forms of vitamin B6, is known to be an effective inhibitor of the formation of advanced glycation end products (AGEs), which are closely related to various human diseases. Pyridoxamine forms stable complexes with metal ions that catalyze the oxidative reactions taking place in the advanced stages of the protein glycation cascade. It also reacts with reactive carbonyl compounds generated as byproducts of protein glycation, thereby preventing further protein damage. We applied Density Functional Theory to study the primary antioxidant activity of pyridoxamine towards three oxygen-centered radicals (•OOH, •OOCH3 and •OCH3) to find out whether this activity may also play a crucial role in the context of protein glycation inhibition. Our results show that, at physiological pH, pyridoxamine can trap the •OCH3 radical, in both aqueous and lipidic media, with rate constants in the diffusion limit (>1.0 × 108 M - 1 s - 1 ). The quickest pathways involve the transfer of the hydrogen atoms from the protonated pyridine nitrogen, the protonated amino group or the phenolic group. Its reactivity towards •OOH and •OOCH3 is smaller, but pyridoxamine can still scavenge them with moderate rate constants in aqueous media. Since reactive oxygen species are also involved in the formation of AGEs, these results highlight that the antioxidant capacity of pyridoxamine is also relevant to explain its inhibitory role on the glycation process.
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Affiliation(s)
- Rafael Ramis
- Institut Universitari d'Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain
- Institut d'Investigació Sanitària Illes Balears (IdISBa), 07120 Palma de Mallorca, Spain
| | - Joaquín Ortega-Castro
- Institut Universitari d'Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain.
- Institut d'Investigació Sanitària Illes Balears (IdISBa), 07120 Palma de Mallorca, Spain.
| | - Carmen Caballero
- Institut Universitari d'Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain
- Institut d'Investigació Sanitària Illes Balears (IdISBa), 07120 Palma de Mallorca, Spain
| | - Rodrigo Casasnovas
- Institut Universitari d'Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain
- Institut d'Investigació Sanitària Illes Balears (IdISBa), 07120 Palma de Mallorca, Spain
| | - Antonia Cerrillo
- Institut Universitari d'Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain
- Institut d'Investigació Sanitària Illes Balears (IdISBa), 07120 Palma de Mallorca, Spain
| | - Bartolomé Vilanova
- Institut Universitari d'Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain
- Institut d'Investigació Sanitària Illes Balears (IdISBa), 07120 Palma de Mallorca, Spain
| | - Miquel Adrover
- Institut Universitari d'Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain
- Institut d'Investigació Sanitària Illes Balears (IdISBa), 07120 Palma de Mallorca, Spain
| | - Juan Frau
- Institut Universitari d'Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain
- Institut d'Investigació Sanitària Illes Balears (IdISBa), 07120 Palma de Mallorca, Spain
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7
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Solís-Calero C, Ortega-Castro J, Frau J, Muñoz F. Scavenger mechanism of methylglyoxal by metformin. A DFT study. Theor Chem Acc 2015. [DOI: 10.1007/s00214-015-1649-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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8
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Solís-Calero C, Ortega-Castro J, Hernández-Laguna A, Muñoz F. DFT study of the mechanism of the reaction of aminoguanidine with methylglyoxal. J Mol Model 2014; 20:2202. [PMID: 24705776 DOI: 10.1007/s00894-014-2202-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 03/04/2014] [Indexed: 11/28/2022]
Abstract
We have studied the mechanism of the reaction between aminoguanidine (AG) and methylglyoxal (MG) by carrying out Dmol3/DFT calculations, obtaining intermediates, transition-state structures, and free-energy profiles for all of the elementary steps of the reaction. Designed models included explicit water solvent, which forms hydrogen-bond networks around the reactants and intermediate molecules, facilitating intramolecular proton transfer in some steps of the reaction mechanism. The reaction take place in four steps, namely: (1) formation of a guanylhydrazone-acetylcarbinol adduct by condensation of AG and MG; (2) dehydration of the adduct; (3) formation of an 1,2,4-triazine derivative by ring closure; and (4) dehydration with the formation of 5-methyl 3-amino-1,2,4-triazine as the final product. From a microkinetic point of view, the first dehydration step was found to be the rate-determining step for the reaction, with the reaction having an apparent activation energy of 12.65 kcal mol⁻¹. Additionally, some analogous structures of intermediates and transition states for the reaction between AG and 2,3-dicarbonyl-phosphatidylethanolamine, a possible intermediate in Amadori-glycated phosphatidylethanolamine (Amadori-PE) autooxidation, were obtained to evaluate the reaction above a phosphatidylethanolamine (PE) surface. Our results are in agreement with experimental results obtaining by other authors, showing that AG is efficient at trapping dicarbonyl compounds such as methylglyoxal, and by extension these compounds joined to biomolecules such as PE in environments such as surfaces and their aqueous surroundings.
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Affiliation(s)
- Christian Solís-Calero
- Departament de Química, Institut d'Investigació en Ciències de la Salut (IUNICS), Universitat de les Illes Balears, E-07122, Palma de Mallorca, Spain
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9
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C–H Activation in Pyridoxal-5′-phosphate and Pyridoxamine-5′-phosphate Schiff Bases: Effect of Metal Chelation. A Computational Study. J Phys Chem B 2013; 117:2339-47. [DOI: 10.1021/jp311861p] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Casasnovas R, Ortega-Castro J, Donoso J, Frau J, Muñoz F. Theoretical calculations of stability constants and pKa values of metal complexes in solution: application to pyridoxamine–copper(ii) complexes and their biological implications in AGE inhibition. Phys Chem Chem Phys 2013; 15:16303-13. [DOI: 10.1039/c3cp50840d] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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11
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A comparative DFT study of the Schiff base formation from acetaldehyde and butylamine, glycine and phosphatidylethanolamine. Theor Chem Acc 2012. [DOI: 10.1007/s00214-012-1263-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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12
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Caldés C, Vilanova B, Adrover M, Muñoz F, Donoso J. Phenol Group in Pyridoxamine Acts as a Stabilizing Element for Its Carbinolamines and Schiff Bases. Chem Biodivers 2011; 8:1318-32. [DOI: 10.1002/cbdv.201000296] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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13
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Chetyrkin S, Mathis M, Pedchenko V, Sanchez OA, McDonald WH, Hachey DL, Madu H, Stec D, Hudson B, Voziyan P. Glucose autoxidation induces functional damage to proteins via modification of critical arginine residues. Biochemistry 2011; 50:6102-12. [PMID: 21661747 DOI: 10.1021/bi200757d] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nonenzymatic modification of proteins in hyperglycemia is a major mechanism causing diabetic complications. These modifications can have pathogenic consequences when they target active site residues, thus affecting protein function. In the present study, we examined the role of glucose autoxidation in functional protein damage using lysozyme and RGD-α3NC1 domain of collagen IV as model proteins in vitro. We demonstrated that glucose autoxidation induced inhibition of lysozyme activity as well as NC1 domain binding to α(V)β(3) integrin receptor via modification of critical arginine residues by reactive carbonyl species (RCS) glyoxal (GO) and methylglyoxal while nonoxidative glucose adduction to the protein did not affect protein function. The role of RCS in protein damage was confirmed using pyridoxamine which blocked glucose autoxidation and RCS production, thus protecting protein function, even in the presence of high concentrations of glucose. Glucose autoxidation may cause protein damage in vivo since increased levels of GO-derived modifications of arginine residues were detected within the assembly interface of collagen IV NC1 domains isolated from renal ECM of diabetic rats. Since arginine residues are frequently present within protein active sites, glucose autoxidation may be a common mechanism contributing to ECM protein functional damage in hyperglycemia and oxidative environment. Our data also point out the pitfalls in functional studies, particularly in cell culture experiments, that involve glucose treatment but do not take into account toxic effects of RCS derived from glucose autoxidation.
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Affiliation(s)
- Sergei Chetyrkin
- Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA
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14
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Solís-Calero C, Ortega-Castro J, Muñoz F. Reactivity of a phospholipid monolayer model under periodic boundary conditions: a density functional theory study of the Schiff base formation between phosphatidylethanolamine and acetaldehyde. J Phys Chem B 2010; 114:15879-85. [PMID: 21077587 DOI: 10.1021/jp1088367] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A mechanism for the formation of the Schiff base between an acetaldehyde and an amine-phospholipid monolayer model based on Dmol3/density functional theory calculations under periodic boundary conditions was constructed. This is the first time such a system has been modeled to examine its chemical reactivity at this computation level. Each unit cell contains two phospholipid molecules, one acetaldehyde molecule, and nine water molecules. One of the amine-phospholipid molecules in the cell possesses a neutral amino group that is used to model the nucleophilic attack on the carboxyl group of acetaldehyde, whereas the other has a charged amino group acting as a proton donor. The nine water molecules form a hydrogen bond network along the polar heads of the phospholipids that facilitates very fast proton conduction at the interface. Using periodic boundary conditions afforded proton transfer between different cells. The reaction takes place in two steps, namely, (1) formation of a carbinolamine and (2) its dehydration to the Schiff base. The carbinolamine is the primary reaction intermediate, and dehydration is the rate-determining step of the process, consistent with available experimental evidence for similar reactions. On the basis of the results, the cell membrane surface environment may boost phospholipid glycation via a neighboring catalyst effect.
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Affiliation(s)
- Christian Solís-Calero
- Institut d'Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
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15
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Ortega-Castro J, Adrover M, Frau J, Salvà A, Donoso J, Muñoz F. DFT Studies on Schiff Base Formation of Vitamin B6 Analogues. Reaction between a Pyridoxamine-Analogue and Carbonyl Compounds. J Phys Chem A 2010; 114:4634-40. [DOI: 10.1021/jp909156m] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. Ortega-Castro
- Institut Universitari d’Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, Cra. Valldemossa km 7.5, E-07122 Palma de Mallorca, Spain
| | - M. Adrover
- Institut Universitari d’Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, Cra. Valldemossa km 7.5, E-07122 Palma de Mallorca, Spain
| | - J. Frau
- Institut Universitari d’Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, Cra. Valldemossa km 7.5, E-07122 Palma de Mallorca, Spain
| | - A. Salvà
- Institut Universitari d’Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, Cra. Valldemossa km 7.5, E-07122 Palma de Mallorca, Spain
| | - J. Donoso
- Institut Universitari d’Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, Cra. Valldemossa km 7.5, E-07122 Palma de Mallorca, Spain
| | - F. Muñoz
- Institut Universitari d’Investigació en Ciències de la Salut (IUNICS), Departament de Química, Universitat de les Illes Balears, Cra. Valldemossa km 7.5, E-07122 Palma de Mallorca, Spain
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16
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Hellmann H, Mooney S. Vitamin B6: a molecule for human health? Molecules 2010; 15:442-59. [PMID: 20110903 PMCID: PMC6257116 DOI: 10.3390/molecules15010442] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2009] [Revised: 01/16/2010] [Accepted: 01/20/2010] [Indexed: 11/16/2022] Open
Abstract
Vitamin B6 is an intriguing molecule that is involved in a wide range of metabolic, physiological and developmental processes. Based on its water solubility and high reactivity when phosphorylated, it is a suitable co-factor for many biochemical processes. Furthermore the vitamin is a potent antioxidant, rivaling carotenoids or tocopherols in its ability to quench reactive oxygen species. It is therefore not surprising that the vitamin is essential and unquestionably important for the cellular metabolism and well-being of all living organisms. The review briefly summarizes the biosynthetic pathways of vitamin B6 in pro- and eukaryotes and its diverse roles in enzymatic reactions. Finally, because in recent years the vitamin has often been considered beneficial for human health, the review will also sum up and critically reflect on current knowledge how human health can profit from vitamin B6.
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Affiliation(s)
- Hanjo Hellmann
- Washington State University, Abelson 435, P.O. Box 66224, Pullman, WA, USA.
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Corzo-Martínez M, Moreno FJ, Olano A, Villamiel M. Role of pyridoxamine in the formation of the Amadori/Heyns compounds and aggregates during the glycation of beta-lactoglobulin with galactose and tagatose. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2010; 58:500-506. [PMID: 20014847 DOI: 10.1021/jf902073t] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The effect of pyridoxamine on the Maillard reaction during the formation of conjugates of beta-lactoglobulin with galactose and tagatose under controlled conditions (pH 7, 0.44 aw, 40 and 50 degrees C, for 6 days) has been studied, for the first time, by means of the changes in reducing carbohydrates, formation of Amadori or Heyns compounds, and aggregates and browning development. The results showed the formation of interaction products between pyridoxamine and galactose or tagatose either in the presence or in the absence of beta-lactoglobulin, indicating that pyridoxamine competes with the free amino groups of beta-lactoglobulin for the carbonyl group of both carbohydrates. Thus, a small inhibitory effect of pyridoxamine on the initial stages of the Maillard reaction was pointed out. Furthermore, much lower aggregation and color formation rates were observed in the conjugates of beta-lactoglobulin galactose/tagatose with pyridoxamine than without this compound, supporting its potent inhibitory effect on the advanced and final stages of the Maillard reaction. These findings reveal the usefulness of food-grade inhibitors of the advanced stages of the Maillard reaction, such as pyridoxamine, that, in combination with mild storage conditions, could lead to the formation of safer neoglycoconjugates without impairing their nutritional quality.
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Affiliation(s)
- Marta Corzo-Martínez
- Instituto de Fermentaciones Industriales (CSIC), C/Juan de la Cierva, 3 28006 Madrid, Spain
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Arribas-Lorenzo G, Morales FJ. Effect of pyridoxamine on acrylamide formation in a glucose/asparagine model system. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2009; 57:901-909. [PMID: 19143489 DOI: 10.1021/jf802870t] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The effect of pyridoxamine (PM) on the reduction of acrylamide (AA) formation in a low-moisture equimolar glucose/asparagine model system was investigated. Formation/elimination kinetics of acrylamide was carried out at temperatures between 120 and 180 degrees C. Time courses of glucose, asparagine, pyridoxamine, 3-aminopropionamide (3-APA), acrylamide, and browning were measured to get more insight on the mechanism of action of PM. PM exhibited an inhibitory effect on AA formation at all temperatures studied, but became more relevant at 160 and 180 degrees C (up to 51% reduction). Degradation rates of glucose and asparagine were not significantly affected by PM, but PM was rapidly consumed in the glucose/asparagine system. Browning was significantly suppressed by addition of PM in the system, and formation of 3-APA was increased as compared to control. In comparison with pyridoxal, pyridoxine, and ascorbic acid, PM exerted the highest inhibition activity against AA formation, and a clear dose-response was observed. The nucleophilic aminomethyl group of PM was crucial for the exertion of an inhibition effect more than double those other B6 vitamers. The action mechanism of PM was attributable to its structural features that have the capacity to scavenge intermediary dicarbonyls formed during sugar degradation and advanced stages of the Maillard reaction. These findings open new possibilities for strategies in acrylamide mitigation where formation of reactive dicarbonyls should be carefully considered.
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Affiliation(s)
- Gema Arribas-Lorenzo
- Consejo Superior de Investigaciones Cientificas, Instituto de Ciencia y Tecnologia de los Alimentos y Nutricion formerly Instituto del Frio, Madrid, Spain
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Adrover M, Vilanova B, Muñoz F, Donoso J. Unexpected isomeric equilibrium in pyridoxamine Schiff bases. Bioorg Chem 2008; 37:26-32. [PMID: 19091373 DOI: 10.1016/j.bioorg.2008.11.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2008] [Revised: 11/05/2008] [Accepted: 11/05/2008] [Indexed: 10/21/2022]
Abstract
Pyridoxamine is a vitamin B(6) derivative involved in biological reactions such as transamination, and can also act as inhibitor in protein glycation. In both cases, it has been reported that Schiff base formation between pyridoxamine and carbonyl compounds is the main step. Nevertheless, few studies on the Schiff base formation have been reported to date. In this work, we conduct a comparative study of the reaction of pyridoxamine and 4-picolylamin (a pyridoxamine analog) with various carbonyl compounds including propanal, formaldehyde and pyruvic acid. Based on the results, 4-picolylamin forms a Schiff base as end-product of its reactions with propanal and pyruvic acid, but a carbinolamine with formaldehyde. On the other hand, pyridoxamine forms a Schiff base with the three reagents, but the end-product is in equilibrium with its hemiaminal form, which results from the attack of the phenolate ion of the pyridine ring on the imine carbon. This isomeric equilibrium should be considered in studying reactions involving amine derivatives of vitamin B(6).
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Affiliation(s)
- Miquel Adrover
- Institut Universitari d'Investigació en Ciències de la Salut, Departament de Química, Universitat de les Illes Balears, Palma de Mallorca, Spain
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Adrover M, Vilanova B, Frau J, Muñoz F, Donoso J. The pyridoxamine action on Amadori compounds: A reexamination of its scavenging capacity and chelating effect. Bioorg Med Chem 2008; 16:5557-69. [DOI: 10.1016/j.bmc.2008.04.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2008] [Revised: 03/26/2008] [Accepted: 04/01/2008] [Indexed: 10/22/2022]
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Chetyrkin SV, Mathis ME, Ham AJL, Hachey DL, Hudson BG, Voziyan PA. Propagation of protein glycation damage involves modification of tryptophan residues via reactive oxygen species: inhibition by pyridoxamine. Free Radic Biol Med 2008; 44:1276-85. [PMID: 18374270 DOI: 10.1016/j.freeradbiomed.2007.09.016] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2007] [Revised: 08/09/2007] [Accepted: 09/21/2007] [Indexed: 02/02/2023]
Abstract
Nonenzymatic modification of proteins is one of the key pathogenic factors in diabetic complications. Uncovering the mechanisms of protein damage caused by glucose is fundamental to understanding this pathogenesis and in the development of new therapies. We investigated whether the mechanism involving reactive oxygen species can propagate protein damage in glycation reactions beyond the classical modifications of lysine and arginine residues. We have demonstrated that glucose can cause specific oxidative modification of tryptophan residues in lysozyme and inhibit lysozyme activity. Furthermore, modification of tryptophan residues was also induced by purified albumin-Amadori, a ribose-derived model glycation intermediate. The AGE inhibitor pyridoxamine (PM) prevented the tryptophan modification, whereas another AGE inhibitor and strong carbonyl scavenger, aminoguanidine, was ineffective. PM specifically inhibited generation of hydroxyl radical from albumin-Amadori and protected tryptophan from oxidation by hydroxyl radical species. We conclude that oxidative degradation of either glucose or the protein-Amadori intermediate causes oxidative modification of protein tryptophan residues via hydroxyl radical and can affect protein function under physiologically relevant conditions. This oxidative stress-induced structural and functional protein damage can be ameliorated by PM via sequestration of catalytic metal ions and scavenging of hydroxyl radical, a mechanism that may contribute to the reported therapeutic effects of PM in the complications of diabetes.
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Affiliation(s)
- Sergei V Chetyrkin
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
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Adrover M, Vilanova B, Muñoz F, Donoso J. Pyridoxamine, a scavenger agent of carbohydrates. INT J CHEM KINET 2007. [DOI: 10.1002/kin.20223] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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