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Othman SA, Abou-Ghadir OF, Ramadan WS, Mostafa YA, El-Awady R, Abdu-Allah HHM. The design, synthesis, biological evaluation, and molecular docking of new 5-aminosalicylamide-4-thiazolinone hybrids as anticancer agents. Arch Pharm (Weinheim) 2023; 356:e2300315. [PMID: 37551741 DOI: 10.1002/ardp.202300315] [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: 06/08/2023] [Revised: 07/21/2023] [Accepted: 07/21/2023] [Indexed: 08/09/2023]
Abstract
New 5-aminosalicylamide-4-thiazolinone hybrids (27) were efficiently synthesized, characterized, and evaluated to explore their structure-activity relationship as anticancer agents. The antiproliferative activities of the new hybrids were evaluated against eight cancer cell lines using the sulforhodamine B assay. The most potent compound (24b) possessed high selectivity on the tested cell lines in the low micromolar range, with much lower effects on normal fibroblast cells (IC50 > 50 µM). The cell lines derived from leukemia (Jurkat), cervix (HeLa), and colon (HCT116) cancers appeared to be the most sensitive, with IC50 of 2 µM. 24b is the N-ethylamide derivative with p-dimethylaminobenzylidene at position 5 of the 4-thiazolinone moiety. Other N-substituents or arylidene derivatives showed lower activity. Hybrids with salicylamides showed lower activity than with methyl salicylate. The results clearly show that the modifications of the carboxy group and arylidene moiety greatly affect the activity. Investigating the possible molecular mechanisms of these hybrids revealed that they act through cell-cycle arrest and induction of apoptosis and epidermal growth factor receptor (EGFR) inhibition. Molecular docking studies rationalize the molecular interactions of 24b with EGFR. This work expands our knowledge of the structural requirements to improve the anticancer activity of 5-aminosalicylic-thiazolinone hybrids and pave the way toward multitarget anticancer salicylates.
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Affiliation(s)
- Shimaa A Othman
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Assiut University, Assiut, Egypt
| | - Ola F Abou-Ghadir
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Assiut University, Assiut, Egypt
| | - Wafaa S Ramadan
- Research Institute for Medical and Health Sciences and College of Pharmacy, University of Sharjah, Sharjah, United Arab Emirates
| | - Yaser A Mostafa
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Assiut University, Assiut, Egypt
| | - Raafat El-Awady
- Research Institute for Medical and Health Sciences and College of Pharmacy, University of Sharjah, Sharjah, United Arab Emirates
| | - Hajjaj H M Abdu-Allah
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Assiut University, Assiut, Egypt
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2
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Fets L, Bevan N, Nunes PM, Campos S, Dos Santos MS, Sherriff E, MacRae JI, House D, Anastasiou D. MOG analogues to explore the MCT2 pharmacophore, α-ketoglutarate biology and cellular effects of N-oxalylglycine. Commun Biol 2022; 5:877. [PMID: 36028752 PMCID: PMC9418262 DOI: 10.1038/s42003-022-03805-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Accepted: 08/05/2022] [Indexed: 11/09/2022] Open
Abstract
α-ketoglutarate (αKG) is a central metabolic node with a broad influence on cellular physiology. The αKG analogue N-oxalylglycine (NOG) and its membrane-permeable pro-drug derivative dimethyl-oxalylglycine (DMOG) have been extensively used as tools to study prolyl hydroxylases (PHDs) and other αKG-dependent processes. In cell culture media, DMOG is rapidly converted to MOG, which enters cells through monocarboxylate transporter MCT2, leading to intracellular NOG concentrations that are sufficiently high to inhibit glutaminolysis enzymes and cause cytotoxicity. Therefore, the degree of (D)MOG instability together with MCT2 expression levels determine the intracellular targets NOG engages with and, ultimately, its effects on cell viability. Here we designed and characterised a series of MOG analogues with the aims of improving compound stability and exploring the functional requirements for interaction with MCT2, a relatively understudied member of the SLC16 family. We report MOG analogues that maintain ability to enter cells via MCT2, and identify compounds that do not inhibit glutaminolysis or cause cytotoxicity but can still inhibit PHDs. We use these analogues to show that, under our experimental conditions, glutaminolysis-induced activation of mTORC1 can be uncoupled from PHD activity. Therefore, these new compounds can help deconvolute cellular effects that result from the polypharmacological action of NOG.
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Affiliation(s)
- Louise Fets
- Cancer Metabolism Laboratory, The Francis Crick Institute, London, UK
- Drug Transport and Tumour Metabolism Lab, MRC London Institute of Medical Sciences, London, UK
| | - Natalie Bevan
- Cancer Metabolism Laboratory, The Francis Crick Institute, London, UK
| | - Patrícia M Nunes
- Cancer Metabolism Laboratory, The Francis Crick Institute, London, UK
| | | | | | | | - James I MacRae
- Metabolomics Science Technology Platform, The Francis Crick Institute, London, UK
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3
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Li Z, Unione L, Liu L, Lang Y, de Vries RP, de Groot RJ, Boons GJ. Synthetic O-Acetylated Sialosides and their Acetamido-deoxy Analogues as Probes for Coronaviral Hemagglutinin-esterase Recognition. J Am Chem Soc 2022; 144:424-435. [PMID: 34967208 DOI: 10.1021/jacs.1c10329] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
O-Acetylation is a common modification of sialic acids that can occur at carbons 4-, 7-, 8-, and/or 9. Acetylated sialosides are employed as receptors by several betacoronaviruses and toroviruses, and by influenza C and D viruses. The molecular basis by which these viruses recognize specific O-acetylated sialosides is poorly understood, and it is unknown how viruses have evolved to recognize specific O-acetylated sialosides expressed by their host. Here, we describe a chemoenzymatic approach that can readily provide sialoglycan analogues in which acetyl esters at C4 and/or C7 are replaced by stabilizing acetamide moieties. The analogues and their natural counterparts were used to examine the ligand requirements of the lectin domain of coronaviral hemagglutinin-esterases (HEs). It revealed that HEs from viruses targeting different host species exhibit different requirements for O-acetylation. It also showed that ester-to-amide perturbation results in decreased or loss of binding. STD NMR and molecular modeling of the complexes of the HE of BCoV with the acetamido analogues and natural counterparts revealed that binding is governed by the complementarity between the acetyl moieties of the sialosides and the hydrophobic patches of the lectin. The precise spatial arrangement of these elements is important, and an ester-to-amide perturbation results in substantial loss of binding. Molecular Dynamics simulations with HEs from coronaviruses infecting other species indicate that these viruses have adapted their HE specificity by the incorporation of hydrophobic or hydrophilic elements to modulate acetyl ester recognition.
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Affiliation(s)
- Zeshi Li
- Department of Chemical Biology and Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht 3584 CG, The Netherlands
| | - Luca Unione
- Department of Chemical Biology and Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht 3584 CG, The Netherlands
| | - Lin Liu
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, Georgia 30602, United States
| | - Yifei Lang
- Virology Division, Department of Biomolecular Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht 3584 CL, The Netherlands
| | - Robert P de Vries
- Department of Chemical Biology and Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht 3584 CG, The Netherlands
| | - Raoul J de Groot
- Virology Division, Department of Biomolecular Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht 3584 CL, The Netherlands
| | - Geert-Jan Boons
- Department of Chemical Biology and Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht 3584 CG, The Netherlands
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, Georgia 30602, United States
- Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht 3584, The Netherlands
- Chemistry Department, University of Georgia, Athens, Georgia 30602, United States
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4
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Kaur M, Kaur H, Singh M, Singh G, Kang TS. Biamphiphilic ionic liquid based aqueous microemulsions as an efficient catalytic medium for cytochrome c. Phys Chem Chem Phys 2021; 23:320-328. [PMID: 33346267 DOI: 10.1039/d0cp04513f] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Considering the remarkable applicability of ionic liquids (ILs) in bio-catalysis involving enzymes, herein, we report new IL based aqueous microemulsions as a catalytic reactor for cytochrome c (Cyt-c). Microemulsions (μEs), comprising water as the polar component, imidazolium (cation) and dioctylsulfosuccinate (AOT) (anion) based biamphiphilic ionic liquid (BAIL) as the surfactant and a hydrophobic ionic liquid (HIL) as the non-polar component have been prepared and characterized. The use of BAIL has promoted the formation of μEs without any co-surfactant, owing to its higher surface activity. The effect of ester- or amide-functionalization of the alkyl chain of the imidazolium cation of BAILs on the phase behavior of μEs has been investigated. The prepared μEs have been characterized via conductivity, dynamic light scattering (DLS), UV-vis absorption and steady-state fluorescence (using external polarity probes) techniques. The prepared μEs have been employed as nano-reactors for exploring the catalytic activity of Cyt-c. The formed BAIL-water nano-interfaces in reverse μEs have exerted a positive effect on the catalytic activity of Cyt-c stored in a water pool of reverse μEs. A five-fold higher rate constant in μEs as compared to buffer establishes μEs as a better catalytic medium. Furthermore, the differing nature of nano-interfaces created by BAILs and water in reverse μEs, depending on the functionalization of the alkyl chain of the cationic part of BAIL, has exerted varying influence on the catalytic activity of Cyt-c. It is expected that the present work will result in providing a versatile platform for the creation of new IL and water based μEs for bio-catalytic applications.
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Affiliation(s)
- Manvir Kaur
- Department of Chemistry, UGC Sponsored Centre for Advanced Studies-II, Guru Nanak Dev University, Amritsar-143005, India.
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Singh G, Singh G, Kancharla S, Kang TS. Complexation Behavior of β-Lactoglobulin with Surface Active Ionic Liquids in Aqueous Solutions: An Experimental and Computational Approach. J Phys Chem B 2019; 123:2169-2181. [DOI: 10.1021/acs.jpcb.8b11610] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Gagandeep Singh
- Department of Chemistry, UGC-Centre for Advance Studies—II, Guru Nanak Dev University, Amritsar 143005, India
| | - Gurbir Singh
- Department of Chemistry, UGC-Centre for Advance Studies—II, Guru Nanak Dev University, Amritsar 143005, India
| | - Srinivasarao Kancharla
- Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Tejwant Singh Kang
- Department of Chemistry, UGC-Centre for Advance Studies—II, Guru Nanak Dev University, Amritsar 143005, India
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Schneider S, Janssen C, Klindtworth E, Mergel O, Möller M, Plamper F. Influence of Polycation Composition on Electrochemical Film Formation. Polymers (Basel) 2018; 10:E429. [PMID: 30966464 PMCID: PMC6415213 DOI: 10.3390/polym10040429] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 04/04/2018] [Accepted: 04/05/2018] [Indexed: 12/15/2022] Open
Abstract
The effect of polyelectrolyte composition on the electrodeposition onto platinum is investigated using a counterion switching approach. Film formation of preformed polyelectrolytes is triggered by oxidation of hexacyanoferrates(II) (ferrocyanide), leading to polyelectrolyte complexes, which are physically crosslinked by hexacyanoferrate(III) (ferricyanide) ions due to preferential ferricyanide/polycation interactions. In this study, the electrodeposition of three different linear polyelectrolytes, namely quaternized poly[2-(dimethylamino)ethyl methacrylate] (i.e., poly{[2-(methacryloyloxy)ethyl]trimethylammonium chloride}; PMOTAC), quaternized poly[2-(dimethylamino)ethyl acrylate] (i.e., poly{[2-(acryloyloxy)ethyl]trimethylammonium chloride}; POTAC), quaternized poly[N-(3-dimethylaminopropyl)methacrylamide] (i.e., poly{[3-(methacrylamido)propyl]trimethylammonium chloride}; PMAPTAC) and different statistical copolymers of these polyelectrolytes with N-(3-aminopropyl)methacrylamide (APMA), are studied. Hydrodynamic voltammetry utilizing a rotating ring disk electrode (RRDE) shows the highest deposition efficiency DE for PMOTAC over PMAPTAC and over POTAC. Increasing incorporation of APMA weakens the preferred interaction of the quaternized units with the hexacyanoferrate(III) ions. At a sufficient APMA content, electrodeposition can thus be prevented. Additional electrochemical quartz crystal microbalance measurements reveal the formation of rigid polyelectrolyte films being highly crosslinked by the hexacyanoferrate(III) ions. Results indicate a different degree of water incorporation into these polyelectrolyte films. Hence, by adjusting the polycation composition, film properties can be tuned, while different chemistries can be incorporated into these electrodeposited thin hydrogel films.
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Affiliation(s)
- Sabine Schneider
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany.
| | - Corinna Janssen
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany.
| | - Elisabeth Klindtworth
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany.
| | - Olga Mergel
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany.
- Department of Biomedical Engineering-FB40, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands.
| | - Martin Möller
- DWI Leibniz-Institute for Interactive Materials, RWTH Aachen University, Forckenbeckstr. 50, 52056 Aachen, Germany.
| | - Felix Plamper
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany.
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7
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Singh G, Singh G, Kang TS. Colloidal systems of surface active ionic liquids and sodium carboxymethyl cellulose: physicochemical investigations and preparation of magnetic nano-composites. Phys Chem Chem Phys 2018; 20:18528-18538. [DOI: 10.1039/c8cp02841a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Carboxymethyl cellulose-surface active ionic liquid colloidal formulations for preparation of magnetic nano-composites.
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Affiliation(s)
- Gagandeep Singh
- Department of Chemistry
- UGC-Centre for Advance Studies – II
- Guru Nanak Dev University
- Amritsar
- India
| | - Gurbir Singh
- Department of Chemistry
- UGC-Centre for Advance Studies – II
- Guru Nanak Dev University
- Amritsar
- India
| | - Tejwant Singh Kang
- Department of Chemistry
- UGC-Centre for Advance Studies – II
- Guru Nanak Dev University
- Amritsar
- India
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8
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Mignon A, Devisscher D, Vermeulen J, Vagenende M, Martins J, Dubruel P, De Belie N, Van Vlierberghe S. Characterization of methacrylated polysaccharides in combination with amine-based monomers for application in mortar. Carbohydr Polym 2017; 168:173-181. [PMID: 28457438 DOI: 10.1016/j.carbpol.2017.03.037] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 03/06/2017] [Accepted: 03/11/2017] [Indexed: 11/30/2022]
Abstract
Smart pH-responsive superabsorbent polymers (SAPs) could be useful for self-healing of cracks in mortar. They will swell minimally during the alkaline conditions of mixing, leading to only small macro-pores but will swell stronger with a lower pH when water enters the cracks. As such, polysaccharides (alginate, chitosan and agarose) were methacrylated and cross-linked with amine-based monomers (dimethylaminoethyl methacrylate and dimethylaminopropyl methacrylamide) to induce a varying pH-sensitivity. These materials showed a strong cross-linking efficiency and induced moisture uptake capacities up to 122% at 95% relative humidity with a negligible hysteresis. Additionally, interesting pH-responsive swelling capacities were obtained, especially for SAPs based on chitosan and agarose with values up to 110gwater/gSAP. Most of these materials showed limited hydrolysis in cement filtrate solutions, making them very promising for use in mortar.
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Affiliation(s)
- Arn Mignon
- Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Technologiepark Zwijnaarde 904, B-9052 Ghent, Belgium; Polymer Chemistry & Biomaterials Research Group, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281, Building S4-bis, B-9000 Ghent, Belgium.
| | - Dries Devisscher
- Design & Synthesis of Organic Semiconductors, Institute for Materials Research, Hasselt University, Agoralaan 1-Building D, 3590 Diepenbeek, Belgium.
| | - Jolien Vermeulen
- Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Technologiepark Zwijnaarde 904, B-9052 Ghent, Belgium.
| | - Maxime Vagenende
- Polymer Chemistry & Biomaterials Research Group, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281, Building S4-bis, B-9000 Ghent, Belgium.
| | - José Martins
- NMR and Structure Analysis Unit, Department of Organic Chemistry, Ghent University, Krijgslaan 281, Building S4 bis, B-9000 Ghent, Belgium.
| | - Peter Dubruel
- Polymer Chemistry & Biomaterials Research Group, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281, Building S4-bis, B-9000 Ghent, Belgium.
| | - Nele De Belie
- Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Technologiepark Zwijnaarde 904, B-9052 Ghent, Belgium.
| | - Sandra Van Vlierberghe
- Polymer Chemistry & Biomaterials Research Group, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281, Building S4-bis, B-9000 Ghent, Belgium.
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Scates BA, Lashbrook BL, Chastain BC, Tominaga K, Elliott BT, Theising NJ, Baker TA, Fitch RW. Polyethylene glycol-based homologated ligands for nicotinic acetylcholine receptors. Bioorg Med Chem 2008; 16:10295-300. [PMID: 19006672 PMCID: PMC2903455 DOI: 10.1016/j.bmc.2008.10.045] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2008] [Revised: 10/16/2008] [Accepted: 10/18/2008] [Indexed: 10/21/2022]
Abstract
A homologous series of polyethylene glycol (PEG) monomethyl ethers were conjugated with three ligand series for nicotinic acetylcholine receptors. Conjugates of acetylaminocholine, the cyclic analog 1-acetyl-4,4-dimethylpiperazinium, and pyridyl ether A-84543 were prepared. Each series was found to retain significant affinity at nicotinic receptors in rat cerebral cortex with tethers of up to six PEG units. Such compounds are hydrophilic ligands which may serve as models for fluorescent/affinity probes and multivalent ligands for nAChR.
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Affiliation(s)
- Bradley A. Scates
- Department of Chemistry, Indiana State University, 600 Chestnut Street, Science S35E, Terre Haute, IN 47809, USA
| | - Bethany L. Lashbrook
- Department of Chemistry, Indiana State University, 600 Chestnut Street, Science S35E, Terre Haute, IN 47809, USA
| | | | | | | | | | | | - Richard W. Fitch
- Department of Chemistry, Indiana State University, 600 Chestnut Street, Science S35E, Terre Haute, IN 47809, USA
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Peretz A, Degani-Katzav N, Talmon M, Danieli E, Gopin A, Malka E, Nachman R, Raz A, Shabat D, Attali B. A tale of switched functions: from cyclooxygenase inhibition to M-channel modulation in new diphenylamine derivatives. PLoS One 2007; 2:e1332. [PMID: 18159230 PMCID: PMC2131780 DOI: 10.1371/journal.pone.0001332] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2007] [Accepted: 11/21/2007] [Indexed: 11/19/2022] Open
Abstract
Cyclooxygenase (COX) enzymes are molecular targets of nonsteroidal anti-inflammatory drugs (NSAIDs), the most used medication worldwide. However, the COX enzymes are not the sole molecular targets of NSAIDs. Recently, we showed that two NSAIDs, diclofenac and meclofenamate, also act as openers of Kv7.2/3 K(+) channels underlying the neuronal M-current. Here we designed new derivatives of diphenylamine carboxylate to dissociate the M-channel opener property from COX inhibition. The carboxylate moiety was derivatized into amides or esters and linked to various alkyl and ether chains. Powerful M-channel openers were generated, provided that the diphenylamine moiety and a terminal hydroxyl group are preserved. In transfected CHO cells, they activated recombinant Kv7.2/3 K(+) channels, causing a hyperpolarizing shift of current activation as measured by whole-cell patch-clamp recording. In sensory dorsal root ganglion and hippocampal neurons, the openers hyperpolarized the membrane potential and robustly depressed evoked spike discharges. They also decreased hippocampal glutamate and GABA release by reducing the frequency of spontaneous excitatory and inhibitory post-synaptic currents. In vivo, the openers exhibited anti-convulsant activity, as measured in mice by the maximal electroshock seizure model. Conversion of the carboxylate function into amide abolished COX inhibition but preserved M-channel modulation. Remarkably, the very same template let us generating potent M-channel blockers. Our results reveal a new and crucial determinant of NSAID-mediated COX inhibition. They also provide a structural framework for designing novel M-channel modulators, including openers and blockers.
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Affiliation(s)
- Asher Peretz
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv, Israel
| | - Nurit Degani-Katzav
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv, Israel
| | - Maya Talmon
- Department of Biochemistry, Georges Wise Faculty of Life Sciences, Tel-Aviv University, Tel Aviv, Israel
| | - Eyal Danieli
- School of Chemistry, Faculty of Exact Sciences, Tel-Aviv University, Tel Aviv, Israel
| | - Anna Gopin
- School of Chemistry, Faculty of Exact Sciences, Tel-Aviv University, Tel Aviv, Israel
| | - Eti Malka
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv, Israel
| | - Rachel Nachman
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv, Israel
| | - Amiram Raz
- Department of Biochemistry, Georges Wise Faculty of Life Sciences, Tel-Aviv University, Tel Aviv, Israel
| | - Doron Shabat
- School of Chemistry, Faculty of Exact Sciences, Tel-Aviv University, Tel Aviv, Israel
| | - Bernard Attali
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv, Israel
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11
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Han Y, Cheng K, Simon KA, Lan Y, Sejwal P, Luk YY. A Biocompatible Surfactant with Folded Hydrophilic Head Group: Enhancing the Stability of Self-Inclusion Complexes of Ferrocenyl in a β-Cyclodextrin Unit by Bond Rigidity. J Am Chem Soc 2006; 128:13913-20. [PMID: 17044719 DOI: 10.1021/ja064591q] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This work reports a new biocompatible surfactant structure, of which the hydrophilic head group is composed of a folded, stable self-inclusion complex of a ferrocenyl substituted beta-cyclodextrin (betaCD). While multiple intra- or intermolecular complexes can exist for this amphiphile, the molecule folds into a unique intramolecular complex with well-defined conformation, in which part of the aliphatic chain and the ferrocene group are both included in the annular cavity of betaCD. Study of different isosteric covalent linkages indicates that this folded structure is stable against displacement by the presence of other small guest molecules. Furthermore, in contrast to ferrocene-CD conjugates that are without the aliphatic chain, the presence of small guest molecules in solution does not influence at all the induced circular dichroism signal of this amphiphile, indicating a sterically congested, but stable, folded conformation of the inclusion complex. This new amphiphile is surface active and, more importantly, does not denature the membrane protein bacteriorhodopsin. Finally, because this surfactant forms self-assembled aggregates, this work introduces a folded structure into soft matters formed by amphiphiles in water.
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Affiliation(s)
- Yongbin Han
- Department of Chemistry, Syracuse University, Syracuse, New York 13244, USA
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12
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Kanakubo A, Gray D, Innocent N, Wonnacott S, Gallagher T. The synthesis and nicotinic binding activity of (±)-epiquinamide and (±)-C(1)-epiepiquinamide. Bioorg Med Chem Lett 2006; 16:4648-51. [PMID: 16784846 DOI: 10.1016/j.bmcl.2006.05.100] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2006] [Revised: 05/31/2006] [Accepted: 05/31/2006] [Indexed: 11/16/2022]
Abstract
The synthesis of (+/-)-epiquinamide 1 and (+/-)-C(1)-epiepiquinamide 2 based on the use of a Curtius rearrangement to introduce the C(1) amino residue is reported. In a competition binding assay for [(3)H]epibatidine binding to rat brain membranes neither (+/-)-1 nor (+/-)-2 showed any significant level of nicotinic activity.
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13
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Tomic-Vatic A, Eytina J, Chapman J, Mahdavian E, Neuzil J, Salvatore BA. Vitamin E amides, a new class of vitamin E analogues with enhanced proapoptotic activity. Int J Cancer 2005; 117:188-93. [PMID: 15900584 DOI: 10.1002/ijc.21171] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Vitamin E (VE) analogues, epitomized by alpha-tocopheryl succinate (alpha-TOS), are proapoptotic agents with selective antineoplastic activity. The molecule of alpha-TOS comprises several structurally and functionally distinct moieties that can be modified in order to yield analogues with higher activity. In order to find analogues with higher apoptogenic efficacy, we prepared novel compounds where the ester bond was replaced by an amide bond. All of these analogues were significantly more proapoptotic than their ester counterparts, with alpha-tocopheryl maleyl amide being the most effective. Importantly, methylation of the free carboxylic group completely obliterated apoptogenic activity of the compounds. Similarly as shown for the ester analogues, the amides induced apoptosis by mitochondrial destabilization. Superiority of amides over the ester analogues may be due to their higher partitioning into the lipid phase, as suggested by the log p-values that were lower for the amides than the corresponding esters. In conclusion, we present evidence that modification of the ester bond of agents such as alpha-TOS can be used as a basis for generating novel analogues with higher efficacy of killing malignant cells, an activity that suggests anticancer effect of the agents.
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Affiliation(s)
- Adisa Tomic-Vatic
- School of Medical Science, Griffith University, Southport, Queensland, Australia
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Turbanti L, Cerbai G, Garzelli G, Renzetti AR, Criscuoli M, Subissi A, Bramanti G, Martinelli A. N-alkyl-nor-tropine esters of 2-phenyl-cyclohexenic acids as new bronchodilator agents. Effect of structural and conformational modifications on affinity for muscarinic receptors. Eur J Med Chem 1992. [DOI: 10.1016/0223-5234(92)90179-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Barlow RB, Shepherd MK, Tydeman H, Veale MA. The affinity of some acetylenic analogues of 4-DAMP methobromide for muscarinic receptors in guinea-pig ileum and atria. Br J Pharmacol 1988; 94:947-51. [PMID: 3179618 PMCID: PMC1854030 DOI: 10.1111/j.1476-5381.1988.tb11608.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
1. The replacement of 4-hydroxy-N-methyl piperidine (HO NMe) in 4-diphenylacetoxy-N-methyl piperidine (4-DAMP) metho-bromide by 4-hydroxy-but-2-ynylamines (HOCH2C=CCH2NR2) reduces the affinity for muscarine-sensitive acetylcholine receptors in guinea-pig ileum and atria. It does not abolish selectivity. The tertiary amines are more active and more selective than the corresponding quaternary salts. 2. Analogous derivatives of 4-hydroxy-but-2-ynylamines which lack the ester group (i.e. substituted 4-hydroxymethyl-propynyl amines) are less active and less selective. The quaternary compounds are more active than the tertiary bases. 3. The diphenylcarbamyl ester of 4-hydroxy-N-methylpiperidine methobromide has less than one-thousandth of the activity of the diphenylacetyl ester (4-DAMP methobromide) and is not selective. 4. Although 4-diphenylacetoxy-butynyl dimethylamine is only about one-hundredth as active as 4-DAMP methobromide it appears to have comparable selectivity. It is an interesting compound because it is a tertiary amine and should cross membranes.
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Affiliation(s)
- R B Barlow
- Department of Pharmacology, Medical School, Bristol
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Brovtsyna NB, Fundamenskii VS, Malinovskii TI, Borodkin YS. Structural and chemical features of cholinergic compounds 1. Molecular and crystal structure of 2-diethylaminoethyl benzylate hydrochloride (amizyl). J STRUCT CHEM+ 1988. [DOI: 10.1007/bf00749594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
In an attempt to obtain more selective antagonists acting at muscarinic M2-receptors, analogues of 4-diphenylacetoxy-N-methylpiperidine methobromide (4-DAMP methobromide) have been synthesized. These were tested, along with silabenzhexol, procyclidine, sila-procyclidine and AFDX-116, in dose-ratio experiments with guinea-pig isolated atria at 30 degrees C and ileum at 30 degrees C and 37 degrees C. The agonist was carbachol and the selectivity was assessed from the difference between log K for receptors in ileum and log K for receptors in atria. The selectivity was not related to the affinity and some weakly active compounds retained appreciable selectivity but no compound had greater selectivity than 4-DAMP methobromide or pentamethylene bis-(4-diphenylacetoxy-N-methylpiperidinium) bromide. Structure-activity relations are discussed. There seem to be steric limits to affinity but there are no obvious indications of the structural features associated with selectivity. It is suggested that more selective drugs may be obtained by introducing groups which may reduce affinity.
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Barlow RB, Kitchen R. The actions of some esters of 4-hydroxyquinuclidine on guinea-pig ileum, atria and rat fundus strip. Br J Pharmacol 1982; 77:549-57. [PMID: 7139202 PMCID: PMC2044632 DOI: 10.1111/j.1476-5381.1982.tb09330.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
1 The acetyl, phenylacetyl, and diphenylacetyl esters of 4-hydroxyquinuclidine and their methiodides have been prepared.2 4-Diphenylacetoxyquinuclidine methiodide has higher affinity for muscarinic receptors than 4-diphenylacetoxy-N-methylpiperidine methiodide (4-DAMP methiodide) but it is less selective. At 30 degrees C its affinity for receptors in ileum is about 5 times that for receptors in atria, a difference similar to that found with diphenylacetoxytrophine methiodide. With 4-DAMP methiodide affinity for receptors in the ileum is over 10 times that for receptors in atria.3 4-Diphenylacetoxyquinuclidine methiodide has higher affinity for muscarinic receptors than 3-diphenylacetoxyquinuclidine hydrochloride or its methiodide.4 4-Acetoxyquinuclidine hydrochloride has less than one-hundredth of the activity of 3-acetoxyquinuclidine hydrochloride (acecyclidine) on guinea-pig ileum, atria, and rat fundus: however, 4-acetoxyquinuclidine methiodide is consistently more active than its 3-isomer, though it is only about 1/25 times as active as acecyclidine.5 4-Acetoxyquinuclidine hydrochloride is only a poor substrate for electric eel acetylcholinesterase: its affinity is similar to that of acecyclidine but it is greatly reduced by methylation.6 The relations between the structure and activity of the agonists are very different from the relations between the structure and affinity of the antagonists, which supports the view that agonists and antagonists bind to different conformations of the muscarinic receptor.
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Barlow RB, Burston KN. Temperature coefficients of affinity and entropies of adsorption from enantiomeric pairs of compounds acting at muscarinic receptors in the guinea-pig ileum. Br J Pharmacol 1979; 66:581-5. [PMID: 465895 PMCID: PMC2043587 DOI: 10.1111/j.1476-5381.1979.tb13697.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
1 The affinities of a series of enantiomeric pairs of esters of phenylcyclohexylglycollic acid, of a pair of esters of alpha-methyltropic acid and of hyoscyamine methiodide have been measured for the muscarinic receptors of the guinea-pig ileum at 30 degrees and 37 degrees C and estimates have been made of their free energies, enthalpies and entropies of adsorption. 2 With (-)-S-hyoscyamine methiodide the enthalpy of adsorption is negative whereas with the (+)-R-enantiomer it is positive. 3 With the esters of phenylcyclohexylglycollic acid the size of the onium group appears to be as important as the stereochemical configuration in determining entropy. Large onium groups appear to be associated with an increase in entropy though this can only be measured approximately because of the narrow range of temperature which can be used.
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Barlow RB. The effects of a hydroxyl group on some chemical and biological properties of n-pentyl ammonium salts. J Pharm Pharmacol 1978; 30:703-10. [PMID: 31434 DOI: 10.1111/j.2042-7158.1978.tb13369.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The effects of a hydroxyl group on the activity and affinity of compounds related to n-pentyltrimethylammonoum have been studied on the guinea-pig ileum, frog rectus, acetylcholinesterase and on partitioning (Rm) and size (phiov, Vm). The hydroxyl group lowered affinity in all tests, confirming the importance of hydrophobic forces in binding to receptors. Activity on the ileum was lowered appreciably but on the rectus only slightly. The effects on Rm did not indicate any interactions between hydroxyl, onium group and water but the apparent size of the hydroxyl group (deltaphiov) depends on the nature of the onium group.
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