26
|
Wolfman C, Viola H, Marder M, Ardenghi P, Wasowski C, Schröder N, Izquierdo I, Rúveda E, Paladini A, Medina JH. Pharmacological characterization of 6-bromo-3'-nitroflavone, a synthetic flavonoid with high affinity for the benzodiazepine receptors. Pharmacol Biochem Behav 1998; 61:239-46. [PMID: 9768558 DOI: 10.1016/s0091-3057(98)00088-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
6-Bromo-3'-nitroflavone is a synthetic flavone derivative that selectively recognizes benzodiazepine receptors and has potent anxiolytic-like effects. Here, we describe in detail its pharmacological characterization. When i.p. injected in mice, 6-bromo-3'-nitroflavone (0.01-0.3 mg/kg) had an anxiolytic-like effect in the elevated plus-maze test. This effect was blocked by the specific benzodiazepine receptor antagonist, flumazenil. In addition, it exhibited anxiolytic-like actions when given orally (1 mg/kg). 6-Bromo-3'-nitroflavone did not exhibit myorelaxant effects (up to 30 mg/kg, i.p.). Unlike diazepam, this flavonoid produced no anterograde amnesia in a one-trial inhibitory avoidance learning. On the other hand, 6-bromo-3'-nitroflavone possessed mild anticonvulsant activity (0.1 mg/kg, i.p.) and provoked sedative-depressant actions only at doses 100-1000 times higher than those producing anxiolytic-like effects. 6-Bromo-3'-nitroflavone (0.1-1 mM) produced a lower potentiation of gamma-amino-butyric acid (GABA)-stimulated 36Cl- influx (126-138%) in comparison to diazepam (0.1 mM: 166%) in cerebral cortical membrane vesicles. Taken together, these findings suggest that 6-bromo-3'-nitroflavone has anxiolytic-like action possibly behaving as a partial agonist of the benzodiazepine receptors.
Collapse
|
27
|
Marder M, Viola H, Bacigaluppo JA, Colombo MI, Wasowski C, Wolfman C, Medina JH, Rúveda EA, Paladini AC. Detection of benzodiazepine receptor ligands in small libraries of flavone derivatives synthesized by solution phase combinatorial chemistry. Biochem Biophys Res Commun 1998; 249:481-5. [PMID: 9712722 DOI: 10.1006/bbrc.1998.9146] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Solution phase combinatorial synthesis of flavone derivatives and evaluation of their affinity for the central benzodiazepine receptors is described. The libraries preparation is simple and provides a convenient method for rapid compound generation and screening. Thirty one new compounds were obtained of which the most promising, as high affinity benzodiazepine receptor ligands, were 6-bromo-3'-fluoroflavone; 6,3'-dichloroflavone; 6-bromo-3'-chloroflavone and 6-chloro-3'-bromoflavone.
Collapse
|
28
|
|
29
|
Medina JH, Viola H, Wolfman C, Marder M, Wasowski C, Calvo D, Paladini AC. Overview--flavonoids: a new family of benzodiazepine receptor ligands. Neurochem Res 1997; 22:419-25. [PMID: 9130252 DOI: 10.1023/a:1027303609517] [Citation(s) in RCA: 165] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Benzodiazepines (BDZs) are the most widely prescribed class of psychoactive drugs in current therapeutic use, despite the important unwanted side-effects that they produce such as sedation, myorelaxation, ataxia, amnesia, ethanol and barbiturate potentiation and tolerance. Searching for safer BDZ-receptor (BDZ-R) ligands we have recently demonstrated the existence of a new family of ligands which have a flavonoid structure. First isolated from plants used as tranquilizers in folkloric medicine, some natural flavonoids have shown to possess a selective and relatively mild affinity for BDZ-Rs and a pharmacological profile compatible with a partial agonistic action. In a logical extension of this discovery various synthetic derivatives of those compounds, such as 6,3'-dinitroflavone were found to have a very potent anxiolytic effect not associated with myorelaxant, amnestic or sedative actions. This dinitro compound, in particular, exhibits a high affinity for the BDZ-Rs (Ki = 12-30 nM). Due to their selective pharmacological profile and low intrinsic efficacy at the BDZ-Rs, flavonoid derivatives, such as those described, could represent an improved therapeutic tool in the treatment of anxiety. In addition, several flavone derivatives may provide important leads for the development of potent and selective BDZ-Rs ligands.
Collapse
|
30
|
Wolfman C, Viola H, Marder M, Wasowski C, Ardenghi P, Izquierdo I, Paladini AC, Medina JH. Anxioselective properties of 6,3'-dinitroflavone, a high-affinity benzodiazepine receptor ligand. Eur J Pharmacol 1996; 318:23-30. [PMID: 9007508 DOI: 10.1016/s0014-2999(96)00784-4] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
6,3'-Dintroflavone is a synthetic flavone derivative with high affinity for central benzodiazepine receptors that has anxiolytic effects. Here, we describe its biochemical and pharmacological characterization. 6,3'-Dinitroflavone inhibited differentially [3H]flunitrazepam binding to central benzodiazepine receptors in several brain regions, showing a lower Ki value in the cerebellum (central benzodiazepine receptor type I-enriched area), and a higher Ki value in the spinal cord and in the dentate gyrus (central benzodiazepine receptor type II-enriched area). When i.p. injected in mice, 6,3'-dinitroflavone had a potent anxiolytic effect in the elevated plus maze test. This effect was blocked by the specific central benzodiazepine receptor antagonist, Ro 15-1788. 6,3'-Dinitroflavone did not exhibit anticonvulsant or myorelaxant effects in mice or amnestic effects in rats. Moreover, it abolished the myorelaxant effect of diazepam. On the other hand, 6,3'-dinitroflavone possessed a mild sedative action only at doses 100-300-fold greater than the anxiolytic one. Based on these findings, we suggest that 6,3'-dinitroflavone has a benzodiazepine partial agonist profile, with low selectivity for central benzodiazepine receptor types I and II.
Collapse
|
31
|
Marder M. Statistical mechanics of cracks. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1996; 54:3442-3454. [PMID: 9965488 DOI: 10.1103/physreve.54.3442] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
32
|
Marder M, Viola H, Wasowski C, Wolfman C, Waterman PG, Cassels BK, Medina JG, Paladini AC. 6-Bromoflavone, a high affinity ligand for the central benzodiazepine receptors is a member of a family of active flavonoids. Biochem Biophys Res Commun 1996; 223:384-9. [PMID: 8670291 DOI: 10.1006/bbrc.1996.0903] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
6-Bromoflavone, obtained by bromination of flavanone, binds to central benzodiazepine receptors with a Ki=70 nM and has a clear anxiolytic activity in mice, at 0.5 mg/kg i.p. A survey of the structure/affinity relationship for those receptors in a series of natural and synthetic flavonoids is presented.
Collapse
|
33
|
|
34
|
Marder M. Instability of a crack in a heated strip. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1994; 49:R51-R54. [PMID: 9961307 DOI: 10.1103/physreve.49.r51] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
35
|
Gross SP, Fineberg J, Marder M, McCormick WD, Swinney HL. Acoustic emissions from rapidly moving cracks. PHYSICAL REVIEW LETTERS 1993; 71:3162-3165. [PMID: 10054873 DOI: 10.1103/physrevlett.71.3162] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
36
|
Marder M. Order versus symmetry in pinwheel tilings of the plane. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:13971-13973. [PMID: 10007798 DOI: 10.1103/physrevb.48.13971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
37
|
|
38
|
Marder M. Comment on "Universal scaling of the stress field at the vicinity of a wedge crack in two dimensions and oscillatory self-similar corrections to scaling". PHYSICAL REVIEW LETTERS 1992; 68:2253. [PMID: 10045347 DOI: 10.1103/physrevlett.68.2253] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
39
|
Fineberg J, Gross SP, Marder M, Swinney HL. Instability in the propagation of fast cracks. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:5146-5154. [PMID: 10000228 DOI: 10.1103/physrevb.45.5146] [Citation(s) in RCA: 182] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
40
|
Marder M. Solidification fronts with unusual long-time behavior. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 45:2158-2160. [PMID: 9907229 DOI: 10.1103/physreva.45.r2158] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
41
|
|
42
|
Marder M. Marder replies. PHYSICAL REVIEW LETTERS 1991; 67:3043. [PMID: 10044624 DOI: 10.1103/physrevlett.67.3043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
43
|
Fineberg J, Gross SP, Marder M, Swinney HL. Instability in dynamic fracture. PHYSICAL REVIEW LETTERS 1991; 67:457-460. [PMID: 10044899 DOI: 10.1103/physrevlett.67.457] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
44
|
|
45
|
Marder M, Papanicolaou N, Psaltakis GC. Phase separation in a t-J model. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:6920-6932. [PMID: 9992948 DOI: 10.1103/physrevb.41.6920] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
46
|
Marder M. Crystals with a twist. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 40:4824-4827. [PMID: 9902739 DOI: 10.1103/physreva.40.4824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
47
|
Johnson BD, Mulligan K, Kiyak HA, Marder M. Aging or disease? Periodontal changes and treatment considerations in the older dental patient. Gerodontology 1989; 8:109-18. [PMID: 2488725 DOI: 10.1111/j.1741-2358.1989.tb00414.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The segment of our society over age 65 is growing, and many more of these people are keeping their teeth for a longer period of time. This suggests that there will be additional need for periodontal therapy in the future, but it also implies that disease-related events must be distinguished from age-related changes. Changes in the periodontium with aging are reviewed, and periodontal disease management strategies in the older patient are discussed.
Collapse
|
48
|
Kiriakidis G, Marder M, Hatzopoulos Z. Role of hydrogen in the preparation of sputtered microcrystalline silicon (μc-Si). ACTA ACUST UNITED AC 1988. [DOI: 10.1016/0165-1633(88)90034-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
49
|
Marder M. Correlations and Ostwald ripening. PHYSICAL REVIEW. A, GENERAL PHYSICS 1987; 36:858-874. [PMID: 9898932 DOI: 10.1103/physreva.36.858] [Citation(s) in RCA: 158] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
50
|
|