26
|
Deedwania P, Gupta M, Stein M, Ycas J, Gold A. Tu-W20:6 First large randomized trial of statin therapy in South Asian patients at risk for coronary heart disease: The iris trial. ATHEROSCLEROSIS SUPP 2006. [DOI: 10.1016/s1567-5688(06)80631-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
27
|
Stein E, Melezinkova H, Le Maulf F, Gold A. W16-O-003 Efficacy and safety of rosuvastatin 40 MG in patients with severe type IIA and IIB hypercholesterolaemia. ATHEROSCLEROSIS SUPP 2005. [DOI: 10.1016/s1567-5688(05)80394-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
28
|
Wang X, Dergacheva O, Griffioen KJS, Huang ZG, Evans C, Gold A, Bouairi E, Mendelowitz D. Action of κ and Δ opioid agonists on premotor cardiac vagal neurons in the nucleus ambiguus. Neuroscience 2004; 129:235-41. [PMID: 15489045 DOI: 10.1016/j.neuroscience.2004.07.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/04/2004] [Indexed: 10/26/2022]
Abstract
Both enkephalin and dynorphin containing fibers are in close proximity to neurons in the nucleus ambiguus, including cardiac vagal neurons. Microinjection of Delta and kappa agonists into the nucleus ambiguus have been shown to evoke decreases in heart rate. Yet little is known about the mechanisms by which Delta and kappa opioid receptors alter the activity of cardiac vagal neurons. This study tests whether kappa and Delta opioid agonists can alter the activity of cardiac vagal neurons by modulating likely opioid targets including voltage gated calcium currents, and both glycinergic and GABA) neurotransmission to cardiac vagal neurons. Cardiac vagal neurons were identified in vitro by a fluorescent tracer and studied using patch clamp techniques. Neither the kappa agonist spiradoline or the Delta agonist [D-Pen(2), D-Pen(5)]enkephalin (DPDPE) modulated the voltage gated calcium currents in cardiac vagal neurons. DPDPE also did not alter either glycinergic or GABAergic synaptic neurotransmission. Spiradoline did not change GABAergic synaptic inputs, but did significantly inhibit glycinergic synaptic inputs to cardiac vagal neurons. At a concentration of 1 microM, spiradoline inhibited the amplitude of glycinergic events, and at a concentration of 5 microM, spiradoline inhibited both glycinergic amplitude and frequency. Spiradoline also inhibited both the amplitude and frequency of glycinergic miniature inhibitory post-synaptic currents, indicating kappa agonists likely act at both presynaptic and postsynaptic sites to inhibit glycinergic neurotransmission to cardiac vagal neurons.
Collapse
MESH Headings
- Analgesics, Opioid/pharmacology
- Animals
- Anti-Arrhythmia Agents/pharmacology
- Calcium Channels/drug effects
- Calcium Channels/physiology
- Enkephalin, D-Penicillamine (2,5)-/pharmacology
- Evoked Potentials/drug effects
- Evoked Potentials/physiology
- Glycine/drug effects
- Glycine/metabolism
- Heart/innervation
- Medulla Oblongata/drug effects
- Medulla Oblongata/physiology
- Patch-Clamp Techniques
- Pyrrolidines/pharmacology
- Rats
- Rats, Sprague-Dawley
- Receptors, GABA/drug effects
- Receptors, GABA/metabolism
- Receptors, Opioid, delta/agonists
- Receptors, Opioid, kappa/agonists
- Vagus Nerve/drug effects
- Vagus Nerve/physiology
Collapse
|
29
|
Abstract
Rapid and secure tissue adherence using adhesives or sealants is an attractive concept. Cyanoacrylates, marine adhesive proteins, fibrin-based sealants, and mixtures of polypeptides and proteoglycans to form "laser solders" are just some of the products and technologies that have been used. Effectiveness, ease of use, cost, strength, degradation, safety, and toxicity are major concerns in seeking an ideal product. Thomas A. Mustoe, MD; Gordon H. Sasaki, MD; and Renato Saltz, MD, address some commonly asked questions about the clinical use of tissue adhesives and sealants in response to questions posed by "Comparing Notes" editor, Alan H. Gold, MD. (Aesthetic Surg J 2003;23:500-503.).
Collapse
|
30
|
|
31
|
Gold A. Treatment of dyschromia. Aesthet Surg J 2003; 23:304-6. [DOI: 10.1016/s1090-820x(03)00161-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
32
|
Ferdinand K, Deedwania P, Haffner S, Caplan R, Gold A. 1P-0290 Designs of 3 trials comparing rosuvastatin and atorvastatin in African American, South Asian, and Hispanic patients: ARIES, IRIS and STARSHIP trials. ATHEROSCLEROSIS SUPP 2003. [DOI: 10.1016/s1567-5688(03)90360-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
33
|
Dolgopolov VT, Gold A. Comment on "weak anisotropy and disorder dependence of the in-plane magnetoresistance in high-mobility (100) si-inversion layers". PHYSICAL REVIEW LETTERS 2002; 89:129701. [PMID: 12225129 DOI: 10.1103/physrevlett.89.129701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2002] [Indexed: 05/23/2023]
|
34
|
Jayaraj K, Gold A, Austin RN, Mandon D, Weiss R, Terner J, Bill E, Muether M, Trautwein AX. Compound I and II Analogs of a Chlorin. J Am Chem Soc 2002. [DOI: 10.1021/ja00140a030] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
35
|
|
36
|
|
37
|
Mandon D, Weiss R, Jayaraj K, Gold A, Terner J, Bill E, Trautwein AX. Models for peroxidase compound I: generation and spectroscopic characterization of new oxoferryl porphyrin .pi. cation radical species. Inorg Chem 2002. [DOI: 10.1021/ic00047a031] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
38
|
Gold A, Jayaraj K, Doppelt P, Weiss R, Chottard G, Bill E, Ding X, Trautwein AX. Oxoferryl complexes of the halogenated (porphinato)iron catalyst [tetrakis(2,6-dichlorophenyl)porphinato]iron. J Am Chem Soc 2002. [DOI: 10.1021/ja00225a028] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
39
|
Toney GE, TerHaar LW, Savrin JE, Gold A, Hatfield WE, Sangaiah R. Characterization of a true intermediate-spin (porphinato)iron(III) complex. Inorg Chem 2002. [DOI: 10.1021/ic00185a004] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
40
|
Mandon D, Ochenbein P, Fischer J, Weiss R, Jayaraj K, Austin RN, Gold A, White PS, Brigaud O. .beta.-Halogenated-pyrrole porphyrins. Molecular structures of 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetramesitylporphyrin, nickel(II) 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetramesitylporphyrin, and nickel(II) 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis(pentafluorophenyl)porphyrin. Inorg Chem 2002. [DOI: 10.1021/ic00037a012] [Citation(s) in RCA: 129] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
41
|
Sangaiah R, Gold A, Toney GE. Synthesis of a series of novel polycyclic aromatic systems: isomers of benz[a]anthracene containing a cyclopenta-fused ring. J Org Chem 2002. [DOI: 10.1021/jo00158a012] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
42
|
Weiss R, Bulach V, Gold A, Terner J, Trautwein AX. Valence-tautomerism in high-valent iron and manganese porphyrins. J Biol Inorg Chem 2001; 6:831-45. [PMID: 11713691 DOI: 10.1007/s007750100277] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2001] [Accepted: 05/29/2001] [Indexed: 10/27/2022]
Abstract
Iron and manganese hemes are "high-valent" when the valence state of the metal exceeds III. Redox chemistry of the high valent metal complexes involves redistribution of holes and electrons over the metal ion and the porphyrin and axial ligands, defined as valence tautomerism. Thus, catalytic pathways of heme-containing biomolecules such as peroxidases, catalases and cytochromes P450 involve valence tautomerism, as do pathways of biomimetic oxygen transfer catalysis by manganese porphyrins, robust catalysts with potential commercial value. Determinants of the site of electron abstraction are key to understanding valence tautomerism. In model systems, metal-centered oxidation is supported by hard anionic axial ligands that are also strongly pi-donating, such as oxo, aryl, bix-methoxy and bis-fluoro groups. Manganese(IV) is more stable than iron(IV) and metal-centered one-electron oxidations occur with weaker pi-donating axial ligands such as bisazido, -isocyanato, -hypochlorito and bis chloro groups. Virtually all known high-valent iron porphyrin complexes oxidized by two-electrons above the ferric state are coordinated by the strongly pi-donating oxo or nitrido ligands. In all well-characterized oxo complexes, iron is in the ferryl state and the second oxidizing equivalent resides on the porphyrin. Complexes with iron(V) have not been definitively characterized. One-electron oxidation of oxomanganese(IV) porphyrin complexes gives the oxomanganese(IV) porphyrin pi-cation redicals. In aqueous solution, oxidation of Mn(III) complexes of tetra cationic N-methylpyridiniumylporphyrin isomers by monooxygen donors yields a transient oxomanganese(V) species.
Collapse
|
43
|
Krasin E, Goldwirth M, Gold A, Goodwin DR. Review of the current methods in the diagnosis and treatment of scaphoid fractures. Postgrad Med J 2001; 77:235-7. [PMID: 11264484 PMCID: PMC1741990 DOI: 10.1136/pmj.77.906.235] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
If neglected or misdiagnosed, non-union of a scaphoid fracture will almost inevitably progress to radiographic and symptomatic osteoarthritis of the wrist with subsequent morbidity and lifelong disability, especially in young males in which the fracture is more common. Fractures of the scaphoid bone are the most common fractures of the carpus and second in occurrence among fractures of the wrist. The diagnosis and treatment are not simple. Familiarity with different imaging methods and treatment options is required. The treatment in most cases is conservative and will lead to uneventful union, but an operation may be needed in certain cases primarily and in the treatment of non-union. The current literature on the diagnosis and treatment of scaphoid fractures is reviewed, and the authors try to make a clear and concise picture of this complex and sometimes controversial field.
Collapse
|
44
|
Kazunga C, Aitken MD, Gold A, Sangaiah R. Fluoranthene-2,3- and -1,5-diones are novel products from the bacterial transformation of fluoranthene. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2001; 35:917-922. [PMID: 11351535 DOI: 10.1021/es001605y] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Fluoranthene is one of the predominant compounds found in soils and sediments contaminated with polycyclic aromatic hydrocarbons (PAH). Four bacterial strains isolated from PAH-contaminated soils transformed fluoranthene to a number of products during growth on phenanthrene, including the novel metabolites fluoranthene-2,3-dione (F23Q) and fluoranthene-1,5-dione (F15Q). Given the known toxicity and mutagenicity of F23Q, we focused on characterizing this metabolite with respect to its effects on the metabolism of other PAH. The yield of F23Q from fluoranthene ranged from 2% for Sphingomonas yanoikuyae R1 to greater than 20% for Pseudomonas stutzeri P16 and Bacillus cereus P21. None of the strains appeared capable of metabolizing F23Q any further. F23Q strongly inhibited phenanthrene removal by strain R1 but had a negligible to minor effect on phenanthrene degradation by the other organisms. At a concentration of 6.8 microM, F23Q also substantially inhibited the mineralization of benz[a]anthracene, benzo[a]pyrene (BaP), and chrysene by strain R1 as well as BaP mineralization by Pseudomonas saccharophila P15. Inhibition of BaP mineralization by strain P15 was still evident at an F23Q concentration of 0.68 microM. The inhibition of strain R1 by F23Q was explained in part by a cytotoxic effect, but results with strain P15 indicate that other mechanisms of inhibition occur. These findings suggest that quinones such as F23Q and F15Q have the potential to accumulate in PAH-contaminated systems and can inhibit the degradation of other PAH.
Collapse
|
45
|
Krasin E, Goldwirth M, Hemo Y, Gold A, Herling G, Otremski I. Could irrigation, debridement and antibiotic therapy cure an infection of a total hip arthroplasty? J Hosp Infect 2001; 47:235-8. [PMID: 11247685 DOI: 10.1053/jhin.2000.0809] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Seven patients suffering from an acute (less than two weeks) infection of a total hip arthroplasty were treated by irrigation and debridement, with appropriate antibiotic therapy and retention of the prosthesis. They were followed for an average of 30 months. Infection did not recur in five (71%) patients, but the other two required further surgery. We conclude that a cure can be obtained by this method, although the results are inferior to re-implantation. A minimal procedure spares a patient the morbidity and cost of a more extensive operation. Higher success rates might have been achieved by selecting patients infected with organisms of low virulence, but there are insufficient data to predict whether this treatment would decrease the success of subsequent re-implantation.
Collapse
|
46
|
|
47
|
|
48
|
Gold A, Dolgopolov VT. Comment on "Charged impurity-scattering-limited low-temperature resistivity of low-density silicon inversion layers". PHYSICAL REVIEW LETTERS 2000; 85:3541. [PMID: 11030942 DOI: 10.1103/physrevlett.85.3541] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/1999] [Indexed: 05/23/2023]
|
49
|
Jayaraj K, Gold A, Ball LM, White PS. N-porphyrinylamino and -amido compounds by addition of an amino or amido nitrogen to a porphyrin meso position. Inorg Chem 2000; 39:3652-64. [PMID: 11196829 DOI: 10.1021/ic000112r] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This report describes the synthesis and characterization of a series of octaethylporphyrin derivatives in which the porphyrin pi-network is connected to phenyl, 3-fluoranthenyl, or 1-pyrenyl aromatic systems through a meso amino or amido nitrogen. Metal-free bases and zinc(II) and iron(III) complexes have been obtained. These compounds represent the first examples of linkages between porphyrins and extended pi-networks through a nitrogen atom directly attached to a porphyrin meso position. 1H NMR studies of the metal-free bases and zinc complexes showed that in the amido-linked adducts, the plane containing the aryl substituent was oriented perpendicular to the plane of the porphyrin. Linkage through the secondary amino nitrogen, however, allowed the aryl plane to rotate toward coplanarity with the porphyrin plane, resulting in conjugation of the highest occupied aryl and porphyrin molecular orbitals through the nitrogen lone pair. In developing routes to the amino-linked compounds, the facile formation of fused azaaryl chlorins via an oxidative intramolecular cycloaddition was observed. An aryl carbon ortho to the meso linkage attacked the beta-carbon of an adjacent pyrrole ring, accompanied by 1,2-migration of a pyrrole beta-ethyl substituent and a two-electron oxidation of the initially formed macrocycle. The resulting structures are analogous to benzochlorins. The electronic spectra of the metal-free bases are characterized by intense, long-wavelength bands in the visible region. Molecular structures of the chloroferric complexes of the azabenzofluorantheno- and azabenzpyrenoporphyrin macrocycles (derived from fusion of the fluoranthenyl and pyrenyl substituents, respectively) were obtained by X-ray diffraction. The porphyrin moiety in the azabenzofluoranthenoporphyrin adopted a gable structure, with a 22 degrees fold along a diagonal including the pyrrole-ring C4 and C16 alpha-carbons. By contrast, the azabenzpyrenoporphyrin was virtually planar.
Collapse
|
50
|
Lin PH, Sangaiah R, Ranasinghe A, Upton PB, La DK, Gold A, Swenberg JA. Formation of quinonoid-derived protein adducts in the liver and brain of Sprague-Dawley rats treated with 2,2',5, 5'-tetrachlorobiphenyl. Chem Res Toxicol 2000; 13:710-8. [PMID: 10956058 DOI: 10.1021/tx000030f] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
A possible role for metabolic activation of 2,2',5, 5'-tetrachlorobiphenyl (TCB) to quinonoid metabolites was investigated in vitro in rat liver microsomes and in vivo in male Sprague-Dawley rats. Incubation of TCB with phenobarbital-induced rat liver microsomes resulted in metabolism of TCB to 3-hydroxy-TCB (3-OH-TCB) and 3,4-dihydroxy-TCB (3,4-diOH-TCB), which were further oxidized to form a reactive intermediate that bound to liver proteins. The predominant species observed in the Raney nickel assay for cysteinyl adducts was identified as 3,4-diOH-TCB, consistent with an adduct having the structure 5-cysteinyl-3,6-dichloro-4-(2', 5'-dichlorophenyl)-1,2-benzoquinone. This adduct may arise via the Michael addition of the sulfhydryl group of cysteine to 3, 6-dichloro-4-(2',5'-dichlorophenyl)-1,2-benzoquinone (Cl(4)PhBQ). Metabolism of 3-OH-TCB by phenobarbital-induced microsomes in the presence of either NADPH or cumene hydroperoxide as a cofactor resulted in the formation of adducts. Dose-dependent formation of cysteinyl adducts was observed in liver cytosolic protein from rats treated with a single dose of TCB (0-200 mg/kg) by gavage. By regression analysis, the TCB adducts decayed with a half-life of 2. 03 +/- 0.131 days (mean +/- SE), which is approximately 2.5-fold shorter than the endogenous half-life for liver cytosolic protein in rat liver, suggesting adduct instability. Saturable formation of TCB adducts was observed in liver cytosolic protein of rats receiving multiple doses of TCB over 5 days. The levels of Cl(4)PhBQ-derived adducts were 2.1-fold greater than the estimated steady-state levels predicted by the single-dose treatment [97.7 +/- 13.2 vs 45.7 +/- 3. 73 (pmol/g)/(mg/kg of body weight)], suggesting induction of metabolism. A single cysteinyl adduct, inferred to be 5-cysteinyl-3, 6-dichloro-4-(2',5'-dichlorophenyl)-1,2-benzoquinone, was detected in brain cytosolic protein of rats treated with multiple doses of TCB with levels of 15.2 (pmol/g)/(mg/kg of body weight). Implied involvement of a reactive quinone in the liver and brain of TCB-treated rats supports the idea that quinonoid metabolites may be important contributors to PCB-derived oxidative damage to genomic DNA.
Collapse
|