1
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Tamborelli A, López Mujica M, Sánchez-Velasco OA, Hormazábal-Campos C, Pérez EG, Gutierrez-Cutiño M, Venegas-Yazigi D, Dalmasso P, Rivas G, Hermosilla-Ibáñez P. A new strategy to build electrochemical enzymatic biosensors using a nanohybrid material based on carbon nanotubes and a rationally designed schiff base containing boronic acid. Talanta 2024; 270:125520. [PMID: 38147722 DOI: 10.1016/j.talanta.2023.125520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 11/27/2023] [Accepted: 12/04/2023] [Indexed: 12/28/2023]
Abstract
We report a nanohybrid material obtained by non-covalent functionalization of multi-walled carbon nanotubes (MWCNTs) with the new ligand (((1E,1'E)-(naphthalene-2,3-diylbis(azaneylylidene))bis(methaneylylidenedene)) bis(4-hydroxy-3,1-phenylene))diboronic acid (SB-dBA), rationally designed to mimic some recognition properties of biomolecules like concanavalin A, for the development of electrochemical biosensors based on the use of glycobiomolecules as biorecognition element. We present, as a proof-of-concept, a hydrogen peroxide biosensor obtained by anchoring horseradish peroxidase (HRP) at a glassy carbon electrode (GCE) modified with the nanohybrid prepared by sonication of 2.0 mg mL-1 MWCNTs and 0.50 mg mL-1 SB-dBA in N,N-dimethyl formamide (DMF) for 30 min. The hydrogen peroxide biosensing was performed at -0.050 V in the presence of 5.0 × 10-4 M hydroquinone. The analytical characteristics of the resulting biosensor are the following: linear range between 0.175 μM and 6.12 μM, detection limit of 58 nM, and reproducibility of 2.0 % using the same nanohybrid (6 biosensors), and 9.0 % using three different nanohybrids. The sensor was successfully used to quantify hydrogen peroxide in enriched milk and human blood serum samples and in a commercial disinfector.
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Affiliation(s)
- Alejandro Tamborelli
- INFIQC, CONICET-UNC, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000, Córdoba, Argentina; CIQA, CONICET, Departamento de Ingeniería Química, Facultad Regional Córdoba, Universidad Tecnológica Nacional, Maestro López esq. Cruz Roja Argentina, 5016, Córdoba, Argentina
| | - Michael López Mujica
- INFIQC, CONICET-UNC, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000, Córdoba, Argentina
| | - Oriel A Sánchez-Velasco
- Department of Organic Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago, 7820436, Chile
| | - Cristóbal Hormazábal-Campos
- Department of Organic Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago, 7820436, Chile
| | - Edwin G Pérez
- Department of Organic Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago, 7820436, Chile
| | - Marlen Gutierrez-Cutiño
- Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, 9170022, Chile; Centro para el Desarrollo de La Nanociencia y la Nanotecnología (CEDENNA), Universidad de Santiago de Chile, Santiago, 9170022, Chile
| | - Diego Venegas-Yazigi
- Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, 9170022, Chile; Centro para el Desarrollo de La Nanociencia y la Nanotecnología (CEDENNA), Universidad de Santiago de Chile, Santiago, 9170022, Chile
| | - Pablo Dalmasso
- CIQA, CONICET, Departamento de Ingeniería Química, Facultad Regional Córdoba, Universidad Tecnológica Nacional, Maestro López esq. Cruz Roja Argentina, 5016, Córdoba, Argentina.
| | - Gustavo Rivas
- INFIQC, CONICET-UNC, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000, Córdoba, Argentina.
| | - Patricio Hermosilla-Ibáñez
- Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, 9170022, Chile; Centro para el Desarrollo de La Nanociencia y la Nanotecnología (CEDENNA), Universidad de Santiago de Chile, Santiago, 9170022, Chile.
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2
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Viscarra F, Chrestia JF, Sanchez Y, Pérez EG, Biggin PC, Bouzat C, Bermudez I, López JJ. Side Groups Convert the α7 Nicotinic Receptor Agonist Ether Quinuclidine into a Type I Positive Allosteric Modulator. ACS Chem Neurosci 2023; 14:2876-2887. [PMID: 37535446 DOI: 10.1021/acschemneuro.3c00225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/05/2023] Open
Abstract
The quinuclidine scaffold has been extensively used for the development of nicotinic acetylcholine receptor (nAChR) agonists, with hydrophobic substituents at position 3 of the quinuclidine framework providing selectivity for α7 nAChRs. In this study, six new ligands (4-9) containing a 3-(pyridin-3-yloxy)quinuclidine moiety (ether quinuclidine) were synthesized to gain a better understanding of the structural-functional properties of ether quinuclidines. To evaluate the pharmacological activity of these ligands, two-electrode voltage-clamp and single-channel recordings were performed. Only ligand 4 activated α7 nAChR. Ligands 5 and 7 had no effects on α7 nAChR, but ligands 6, 8, and 9 potentiated the currents evoked by ACh. Ligand 6 was the most potent and efficacious of the potentiating ligands, with an estimated EC50 for potentiation of 12.6 ± 3.32 μM and a maximal potentiation of EC20 ACh responses of 850 ± 120%. Ligand 6 increased the maximal ACh responses without changing the kinetics of the current responses. At the single-channel level, the potentiation exerted by ligand 6 was evidenced in the low micromolar concentration range by the appearance of prolonged bursts of channel openings. Furthermore, computational studies revealed the preference of ligand 6 for an intersubunit site in the transmembrane domain and highlighted some putative key interactions that explain the different profiles of the synthesized ligands. Notably, Met276 in the 15' position of the transmembrane domain 2 almost abolished the effects of ligand 6 when mutated to Leu. We conclude that ligand 6 is a novel type I positive allosteric modulator (PAM-I) of α7 nAChR.
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Affiliation(s)
- Franco Viscarra
- Department of Biological and Medical Sciences, Oxford Brookes University, Gipsy Lane, Oxford OX3 0BP, U.K
- Structural Bioinformatics and Computational Biochemistry, Department of Biochemistry, Oxford University, South Parks Road, Oxford OX1 3QU, U.K
| | - Juan Facundo Chrestia
- Departamento de Biología, Bioquímica y Farmacia, Instituto de Investigaciones Bioquímicas de Bahía Blanca, Universidad Nacional del Sur-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Camino La Carrindanga Km 7, Bahía Blanca 8000, Argentina
| | - Yaima Sanchez
- Department of Organic Chemistry, Faculty of Chemistry, Universidad de Concepción, Edmundo Larenas 129, Concepción 4070371, Chile
| | - Edwin G Pérez
- Department of Organic Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Santiago 7820436, Chile
| | - Philip C Biggin
- Structural Bioinformatics and Computational Biochemistry, Department of Biochemistry, Oxford University, South Parks Road, Oxford OX1 3QU, U.K
| | - Cecilia Bouzat
- Departamento de Biología, Bioquímica y Farmacia, Instituto de Investigaciones Bioquímicas de Bahía Blanca, Universidad Nacional del Sur-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Camino La Carrindanga Km 7, Bahía Blanca 8000, Argentina
| | - Isabel Bermudez
- Department of Biological and Medical Sciences, Oxford Brookes University, Gipsy Lane, Oxford OX3 0BP, U.K
| | - Jhon J López
- Department of Organic Chemistry, Faculty of Chemistry, Universidad de Concepción, Edmundo Larenas 129, Concepción 4070371, Chile
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3
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Valencia J, Sánchez-Velasco OA, Saavedra-Olavarría J, Hermosilla-Ibáñez P, Pérez EG, Insuasty D. N-Arylation of 3-Formylquinolin-2(1 H)-ones Using Copper(II)-Catalyzed Chan-Lam Coupling. Molecules 2022; 27:molecules27238345. [PMID: 36500438 PMCID: PMC9735505 DOI: 10.3390/molecules27238345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 11/03/2022] [Accepted: 11/07/2022] [Indexed: 12/02/2022]
Abstract
3-formyl-2-quinolones have attracted the scientific community's attention because they are used as versatile building blocks in the synthesis of more complex compounds showing different and attractive biological activities. Using copper-catalyzed Chan-Lam coupling, we synthesized 32 new N-aryl-3-formyl-2-quinolone derivatives at 80 °C, in air and using inexpensive phenylboronic acids as arylating agents. 3-formyl-2-quinolones and substituted 3-formyl-2-quinolones can act as substrates, and among the products, the p-methyl derivative 9a was used as a substrate to obtain different derivatives such as alcohol, amine, nitrile, and chalcone.
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Affiliation(s)
- Jhesua Valencia
- Departamento de Química y Biología, División de Ciencias Básicas, Universidad del Norte, Km 5 Vía Puerto Colombia, Barranquilla 081007, Colombia
| | - Oriel A. Sánchez-Velasco
- Department of Organic Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Jorge Saavedra-Olavarría
- Department of Organic Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Patricio Hermosilla-Ibáñez
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Materials Chemistry Department, Faculty of Chemistry and Biology, University of Santiago, Chile, Santiago 9170022, Chile
| | - Edwin G. Pérez
- Department of Organic Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
- Correspondence: (E.G.P.); (D.I.)
| | - Daniel Insuasty
- Departamento de Química y Biología, División de Ciencias Básicas, Universidad del Norte, Km 5 Vía Puerto Colombia, Barranquilla 081007, Colombia
- Correspondence: (E.G.P.); (D.I.)
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4
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Almendras S, Zárate AM, Dinamarca-Villarroel L, Guerra D, Fuentealba D, Eltit JM, Aliaga ME, Fierro A, Pérez EG. Host–guest complexation of APP + with cucurbit[7]uril. Theoretical and experimental studies on the supramolecular inhibition of its cytotoxicity on SERT. NEW J CHEM 2022. [DOI: 10.1039/d2nj01963a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The supramolecular binding behavior of APP+ and CB[7] in aqueous solution was studied by different techniques. APP+ showed cytotoxicity towards HEK293 cells expressing hSERT. This cytotoxicity was inhibited by the treatment of the cells with CB[7].
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Affiliation(s)
- Sebastián Almendras
- Department of Organic Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Ana María Zárate
- Department of Organic Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Luis Dinamarca-Villarroel
- Department of Organic Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Daniel Guerra
- Department of Physical Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Denis Fuentealba
- Department of Physical Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Jose M. Eltit
- Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, Richmond, Virginia 23298, USA
| | - Margarita E. Aliaga
- Department of Physical Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Angélica Fierro
- Department of Organic Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Edwin G. Pérez
- Department of Organic Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
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5
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Merchan‐Arenas DR, Rivero‐Jerez PS, Pérez EG. Synthesis of
N
‐arylsulfonamides via Chan‐Lam Coupling Between Aryl Boronic Acids and
N
‐[(sulfonyl)imino]phenyliodinanes. ChemistrySelect 2021. [DOI: 10.1002/slct.202103876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Diego R. Merchan‐Arenas
- Department of Organic Chemistry Faculty of Chemistry and Pharmacy Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860 Santiago 7820436 Santiago Chile
| | - Paula S. Rivero‐Jerez
- Department of Organic Chemistry Faculty of Chemistry and Pharmacy Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860 Santiago 7820436 Santiago Chile
| | - Edwin G. Pérez
- Department of Organic Chemistry Faculty of Chemistry and Pharmacy Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860 Santiago 7820436 Santiago Chile
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6
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Sánchez-Velasco OA, Saavedra-Olavarría J, Araya-Santelices DAA, Hermosilla-Ibáñez P, Cassels BK, Pérez EG. Synthesis of N-Arylcytisine Derivatives Using the Copper-Catalyzed Chan-Lam Coupling. J Nat Prod 2021; 84:1985-1992. [PMID: 34213336 DOI: 10.1021/acs.jnatprod.1c00275] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
N-Arylcytisine derivatives are quite rare. We report here a practical methodology to obtain these compounds. Using the copper-catalyzed Chan-Lam coupling, we synthesized new N-arylcytisine derivatives at room temperature, in air and using inexpensive phenylboronic acids. Cytisine and 3,5-dihalocytisines can act as substrates, and among the products, the p-Br-derivative 2r was used as a substrate to obtain biaryl derivatives under Pd-coupling conditions; ester 2j was converted into its acid and amide derivatives using classical carbodiimide conditions. This shows that the Chan-Lam cross-coupling reaction can be included as a versatile synthetic tool in the derivatization of natural products.
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Affiliation(s)
- Oriel A Sánchez-Velasco
- Department of Organic Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | | | - Daniel A A Araya-Santelices
- Department of Organic Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Patricio Hermosilla-Ibáñez
- Materials Chemistry Department, Faculty of Chemistry and Biology, University of Santiago de Chile (USACh), Santiago 9170022, Chile
- Center for the Development of Nanoscience and Nanotechnology, CEDENNA, Santiago 9170022, Chile
| | - Bruce K Cassels
- Department of Chemistry, Faculty of Sciences, University of Chile, Santiago 7800003, Chile
| | - Edwin G Pérez
- Department of Organic Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
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7
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Alcázar J, Geue N, Valladares V, Cañete A, Pérez EG, García-Río L, Santos JG, Aliaga ME. Supramolecular Control of Reactivity toward Hydrolysis of 7-Diethylaminocoumarin Schiff Bases by Cucurbit[7]uril Encapsulation. ACS Omega 2021; 6:10333-10342. [PMID: 34056186 PMCID: PMC8153742 DOI: 10.1021/acsomega.1c00683] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 03/26/2021] [Indexed: 05/06/2023]
Abstract
A series of aromatic Schiff bases, featuring 7-diethylamino-coumarin and with five different substituents at an adjacent phenyl ring, were synthesized and characterized. With the aim of assessing the stability of these dyes in acidic medium, their hydrolysis reactions were kinetically studied in the absence and presence of the macrocycle cucurbit[7]uril (CB[7]). Our results are consistent with a model containing three different forms of substrates (un-, mono-, and diprotonated) and three parallel reaction pathways. The pK a values and the rate constants were estimated and discussed in terms of the presence of a hydroxyl group at the ortho position and electron-releasing groups on the phenyl ring of the dyes. The kinetic study in the presence of CB[7] led to two different behaviors. Promotion of the reaction by CB[7] was observed for the hydrolysis of the Schiff bases containing only one coordination site toward the macrocycle. Conversely, an inhibitor effect was observed for the hydrolysis of a Schiff base with two coordination sites toward CB[7]. The latter effect could be explained with a model as a function of a prototropic tautomeric equilibrium and the formation of a 2:1 host/guest complex, which prevents the attack of water. Therefore, the kinetic results demonstrated a supramolecular control of the macrocycle toward the reactivity and stability of 7-diethylaminocoumarin Schiff bases in acidic medium.
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Affiliation(s)
- Jackson
J. Alcázar
- Facultad
de Química y de Farmacia, Pontificia
Universidad Católica de Chile, Casilla 306, Santiago 6094411, Chile
| | - Niklas Geue
- Department
of Chemistry and Mineralogy, Leipzig University, 04103 Leipzig, Germany
| | - Verónica Valladares
- Facultad
de Química y de Farmacia, Pontificia
Universidad Católica de Chile, Casilla 306, Santiago 6094411, Chile
| | - Alvaro Cañete
- Instituto
de Ciencias Químicas Aplicadas, Universidad
Autónoma de Chile, Av. Pedro de Valdivia 425, Santiago 2520000, Chile
| | - Edwin G. Pérez
- Facultad
de Química y de Farmacia, Pontificia
Universidad Católica de Chile, Casilla 306, Santiago 6094411, Chile
| | - Luis García-Río
- Departamento
de Química Física, Centro de Investigación en
Química Biológica y Materiales Moleculares (CIQUS), Universidad de Santiago, 15782 Santiago, Spain
| | - José G. Santos
- Facultad
de Química y de Farmacia, Pontificia
Universidad Católica de Chile, Casilla 306, Santiago 6094411, Chile
| | - Margarita E. Aliaga
- Facultad
de Química y de Farmacia, Pontificia
Universidad Católica de Chile, Casilla 306, Santiago 6094411, Chile
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8
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Duarte Y, Rojas M, Canan J, Pérez EG, González-Nilo F, García-Colunga J. Different Classes of Antidepressants Inhibit the Rat α7 Nicotinic Acetylcholine Receptor by Interacting within the Ion Channel: A Functional and Structural Study. Molecules 2021; 26:molecules26040998. [PMID: 33668529 PMCID: PMC7918632 DOI: 10.3390/molecules26040998] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/05/2021] [Accepted: 02/11/2021] [Indexed: 12/21/2022] Open
Abstract
Several antidepressants inhibit nicotinic acetylcholine receptors (nAChRs) in a non-competitive and voltage-dependent fashion. Here, we asked whether antidepressants with a different structure and pharmacological profile modulate the rat α7 nAChR through a similar mechanism by interacting within the ion-channel. We applied electrophysiological (recording of the ion current elicited by choline, ICh, which activates α7 nAChRs from rat CA1 hippocampal interneurons) and in silico approaches (homology modeling of the rat α7 nAChR, molecular docking, molecular dynamics simulations, and binding free energy calculations). The antidepressants inhibited ICh with the order: norfluoxetine ~ mirtazapine ~ imipramine < bupropion ~ fluoxetine ~ venlafaxine ~ escitalopram. The constructed homology model of the rat α7 nAChR resulted in the extracellular vestibule and the channel pore is highly negatively charged, which facilitates the permeation of cations and the entrance of the protonated form of antidepressants. Molecular docking and molecular dynamics simulations were carried out within the ion−channel of the α7 nAChR, revealing that the antidepressants adopt poses along the receptor channel, with slightly different binding-free energy values. Furthermore, the inhibition of ICh and free energy values for each antidepressant-receptor complex were highly correlated. Thus, the α7 nAChR is negatively modulated by a variety of antidepressants interacting in the ion−channel.
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Affiliation(s)
- Yorley Duarte
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Av. República 330, Santiago 8370146, Chile; (Y.D.); (M.R.); (J.C.); (F.G.-N.)
- Interdisciplinary Centre for Neuroscience of Valparaíso, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso 2381850, Chile
| | - Maximiliano Rojas
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Av. República 330, Santiago 8370146, Chile; (Y.D.); (M.R.); (J.C.); (F.G.-N.)
| | - Jonathan Canan
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Av. República 330, Santiago 8370146, Chile; (Y.D.); (M.R.); (J.C.); (F.G.-N.)
| | - Edwin G. Pérez
- Department of Organic Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile;
| | - Fernando González-Nilo
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Av. República 330, Santiago 8370146, Chile; (Y.D.); (M.R.); (J.C.); (F.G.-N.)
- Interdisciplinary Centre for Neuroscience of Valparaíso, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso 2381850, Chile
| | - Jesús García-Colunga
- Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Campus Juriquilla, Boulevard Juriquilla 3001, Juriquilla, Querétaro 76230, Mexico
- Correspondence: ; Tel.: +52-442-238-1063
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9
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López JJ, Pérez EG. New convergent one pot synthesis of amino benzyl ethers bearing a nitrogen-containing bicycle. SYNTHETIC COMMUN 2019. [DOI: 10.1080/00397911.2019.1568498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Jhon J. López
- Department of Organic Chemistry, Faculty of Chemical Sciences, Universidad de Concepción, Concepción, Chile
| | - Edwin G. Pérez
- Department of Organic Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago, Chile
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10
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Saavedra-Olavarría J, Madrid-Rojas M, Almodovar I, Hermosilla-Ibáñez P, Pérez EG. Synthesis of β-alkoxy- N-protected phenethylamines via one-pot copper-catalyzed aziridination and ring opening. RSC Adv 2018; 8:27919-27923. [PMID: 35542724 PMCID: PMC9083506 DOI: 10.1039/c8ra03815e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 07/26/2018] [Indexed: 12/15/2022] Open
Abstract
A regioselective, copper-catalyzed, one-pot aminoalkoxylation of styrenes using primary and secondary alcohols and three different iminoiodanes as alkoxy and nitrogen sources respectively, is reported. The β-alkoxy-N-protected phenethylamines obtained were used to synthesise β-alkoxy-N-benzylphenethylamines which are interesting new compounds that could act as possible neuronal ligands. An efficient, regioselective and rapid copper-catalyzed one-pot aminoalkoxylation of styrenes has been developed using different alcohols and phenyl iminoiodinanes.![]()
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Affiliation(s)
- Jorge Saavedra-Olavarría
- Department of Organic Chemistry, Faculty of Chemistry, Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860, Casilla 306, Correo 22 Santiago Chile
| | - Matías Madrid-Rojas
- Facultad de Química y Biología, Universidad de Santiago de Chile, USACh Santiago Chile
| | - Iriux Almodovar
- Facultad de Química y Biología, Universidad de Santiago de Chile, USACh Santiago Chile
| | | | - Edwin G Pérez
- Department of Organic Chemistry, Faculty of Chemistry, Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860, Casilla 306, Correo 22 Santiago Chile
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11
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López JJ, García-Colunga J, Pérez EG, Fierro A. Methylpiperidinium Iodides as Novel Antagonists for α7 Nicotinic Acetylcholine Receptors. Front Pharmacol 2018; 9:744. [PMID: 30042682 PMCID: PMC6048275 DOI: 10.3389/fphar.2018.00744] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 06/19/2018] [Indexed: 11/17/2022] Open
Abstract
The α7 nicotinic acetylcholine receptor (nAChR) is expressed in neuronal and non-neuronal cells and is involved in several physiopathological processes, and is thus an important drug target. We have designed and synthesized novel piperidine derivatives as α7 nAChR antagonists. Thus, we describe here a new series of 1-[2-(4-alkoxy-phenoxy-ethyl)]piperidines and 1-[2-(4-alkyloxy-phenoxy-ethyl)]-1-methylpiperidinium iodides (compounds 11a-11c and 12a-12c), and their actions on α7 nAChRs. The pharmacological activity of these compounds was studied in rat CA1 hippocampal interneurons by using the whole-cell voltage-clamp technique. Inhibition of the choline-induced current was less for 11a-11c than for the methylpiperidinium iodides 12a-12c and depended on the length of the aliphatic chain. Those compounds showing strong effects were studied further using molecular docking and molecular dynamics simulations. The strongest and non-voltage dependent antagonism was shown by 12a, which could establish cation–π interactions with the principal (+)-side and van der Waals interactions with the complementary (-)-side in the α7 nAChRs. Furthermore, compound 11a forms hydrogen bonds with residue Q115 of the complementary (-)-side through water molecules without forming cation–π interactions. Our findings have led to the establishment of a new family of antagonists that interact with the agonist binding cavity of the α7 nAChR, which represent a promising new class of compounds for the treatment of pathologies where these receptors need to be negatively modulated, including neuropsychiatric disorders as well as different types of cancer.
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Affiliation(s)
- Jhon J López
- Department of Chemistry, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Jesús García-Colunga
- Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Edwin G Pérez
- Department of Organic Chemistry, Faculty of Chemistry, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Angélica Fierro
- Department of Organic Chemistry, Faculty of Chemistry, Pontificia Universidad Católica de Chile, Santiago, Chile
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Martínez C, Pérez EG, Iglesias Á, Escudero-Adán EC, Muñiz K. Regioselective Intermolecular Diamination and Aminooxygenation of Alkenes with Saccharin. Org Lett 2016; 18:2998-3001. [PMID: 27266654 DOI: 10.1021/acs.orglett.6b01368] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Palladium catalysis enables the regioselective difunctionalization of alkenes using saccharin as the nitrogen source in the initial step of aminopalladation. Depending on the reaction conditions, diamination or aminooxygenation pathways can be accessed using hypervalent iodine reagents as the terminal oxidants. The aminooxygenation of allylic ethers originates from an unprecedented ambident behavior of saccharin. The participating palladium catalysts contain a palladium-saccharide unit. Two representative complexes of this type could be isolated and characterized.
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Affiliation(s)
- Claudio Martínez
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology , Av Països Catalans 16, 43007 Tarragona, Spain
| | - Edwin G Pérez
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology , Av Països Catalans 16, 43007 Tarragona, Spain.,Departamento de Química Orgánica, Facultad de Química, Pontificia Universidad Católica de Chile , Vicuña Mackenna 4860, Casilla 306, Santiago 22, Chile
| | - Álvaro Iglesias
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology , Av Països Catalans 16, 43007 Tarragona, Spain
| | - Eduardo C Escudero-Adán
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology , Av Països Catalans 16, 43007 Tarragona, Spain
| | - Kilian Muñiz
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology , Av Països Catalans 16, 43007 Tarragona, Spain.,Catalan Institution for Research and Advanced Studies (ICREA) , Pg Lluís Companys 23, 08010 Barcelona, Spain
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Herrera-Leyton C, Madrid-Rojas M, López JJ, Cañete Á, Hermosilla-Ibáñez P, Pérez EG. Copper-Catalyzed Intermolecular Aminooxygenation of Styrenes usingN-Fluorobenzenesulfonimide and Simple Alcohols. ChemCatChem 2016. [DOI: 10.1002/cctc.201600254] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Camilo Herrera-Leyton
- Department of Organic Chemistry; Faculty of Chemistry; Pontificia Universidad Católica de Chile; Av. Vicuña Mackenna 4860, Casilla 306, correo 22 Santiago Chile
| | - Matías Madrid-Rojas
- Department of Organic Chemistry; Faculty of Chemistry; Pontificia Universidad Católica de Chile; Av. Vicuña Mackenna 4860, Casilla 306, correo 22 Santiago Chile
| | - Jhon J. López
- Department of Organic Chemistry; Faculty of Chemistry; Pontificia Universidad Católica de Chile; Av. Vicuña Mackenna 4860, Casilla 306, correo 22 Santiago Chile
| | - Álvaro Cañete
- Department of Organic Chemistry; Faculty of Chemistry; Pontificia Universidad Católica de Chile; Av. Vicuña Mackenna 4860, Casilla 306, correo 22 Santiago Chile
| | - Patricio Hermosilla-Ibáñez
- Facultad de Química y Biología; Universidad de Santiago de Chile (USA)CH, Santiago (Chile) and Centro para el Desarrollo de la Nanotecnología, CEDENNA; Santiago Chile
| | - Edwin G. Pérez
- Department of Organic Chemistry; Faculty of Chemistry; Pontificia Universidad Católica de Chile; Av. Vicuña Mackenna 4860, Casilla 306, correo 22 Santiago Chile
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López JJ, Pérez EG, García-Colunga J. Dual effects of a 2-benzylquinuclidinium derivative on α7-containing nicotinic acetylcholine receptors in rat hippocampal interneurons. Neurosci Lett 2015; 607:35-39. [PMID: 26384784 DOI: 10.1016/j.neulet.2015.09.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 09/09/2015] [Accepted: 09/14/2015] [Indexed: 11/18/2022]
Abstract
Nicotinic acetylcholine receptors (nAChRs) are widely distributed in the brain. Particularly α7-containing nAChRs, associated with several physiological roles and pathologies, are one of the most abundant. Here, we studied 2-(4-hexyloxybenzyl)-1-methylquinuclidin-1-ium iodide (designated as 8d), on ion currents elicited by choline, ICh, (Ch, a selective agonist for α7-containing nAChRs), recorded in interneurons from the stratum radiatum of the rat hippocampal CA1 region by using the whole-cell voltage-clamp technique. The 8d-concentration/Ch-response relationship exhibited high and low inhibitory affinities for α7-containing nAChRs, with IC50 values of 0.59 and 6.80 μM, respectively. Interestingly, 8d in a range of 3-10 μM exerted opposite effects: a short early potentiation and a long late inhibition of the ICh; and 8d alone elicited a non-decaying inward current. Furthermore, potentiation and inhibition of the ICh by 8d depended on the membrane potential, both being stronger at -20 than at -70 mV; indicating that 8d interacts with at least two sites into the ion channel/receptor complex: one for potentiating and another for inhibiting the α7-containing nAChRs. These results suggest that 8d may act as agonist, antagonist and positive modulator of α7-containing nAChRs in hippocampal interneurons.
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Affiliation(s)
- Jhon J López
- Department of Organic Chemistry, Faculty of Chemistry, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Casilla 306, Correo 22, Santiago, Chile
| | - Edwin G Pérez
- Department of Organic Chemistry, Faculty of Chemistry, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Casilla 306, Correo 22, Santiago, Chile.
| | - Jesús García-Colunga
- Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Campus Juriquilla, Boulevard Juriquilla 3001, Querétaro 76230, Mexico.
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Saavedra-Olavarría J, Arteaga GC, López JJ, Pérez EG. Copper-catalyzed intermolecular and regioselective aminofluorination of styrenes: facile access to β-fluoro-N-protected phenethylamines. Chem Commun (Camb) 2015; 51:3379-82. [DOI: 10.1039/c4cc10162f] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A copper-catalyzed regio- and intermolecular aminofluorination of styrenes has been developed.
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Affiliation(s)
- Jorge Saavedra-Olavarría
- Department of Organic Chemistry
- Faculty of Chemistry
- Pontificia Universidad Católica de Chile
- Santiago
- Chile
| | - Gean C. Arteaga
- Department of Organic Chemistry
- Faculty of Chemistry
- Pontificia Universidad Católica de Chile
- Santiago
- Chile
| | - Jhon J. López
- Department of Organic Chemistry
- Faculty of Chemistry
- Pontificia Universidad Católica de Chile
- Santiago
- Chile
| | - Edwin G. Pérez
- Department of Organic Chemistry
- Faculty of Chemistry
- Pontificia Universidad Católica de Chile
- Santiago
- Chile
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Lipovsek M, Fierro A, Pérez EG, Boffi JC, Millar NS, Fuchs PA, Katz E, Elgoyhen AB. Tracking the molecular evolution of calcium permeability in a nicotinic acetylcholine receptor. Mol Biol Evol 2014; 31:3250-65. [PMID: 25193338 PMCID: PMC4245820 DOI: 10.1093/molbev/msu258] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Nicotinic acetylcholine receptors are a family of ligand-gated nonselective cationic channels that participate in fundamental physiological processes at both the central and the peripheral nervous system. The extent of calcium entry through ligand-gated ion channels defines their distinct functions. The α9α10 nicotinic cholinergic receptor, expressed in cochlear hair cells, is a peculiar member of the family as it shows differences in the extent of calcium permeability across species. In particular, mammalian α9α10 receptors are among the ligand-gated ion channels which exhibit the highest calcium selectivity. This acquired differential property provides the unique opportunity of studying how protein function was shaped along evolutionary history, by tracking its evolutionary record and experimentally defining the amino acid changes involved. We have applied a molecular evolution approach of ancestral sequence reconstruction, together with molecular dynamics simulations and an evolutionary-based mutagenesis strategy, in order to trace the molecular events that yielded a high calcium permeable nicotinic α9α10 mammalian receptor. Only three specific amino acid substitutions in the α9 subunit were directly involved. These are located at the extracellular vestibule and at the exit of the channel pore and not at the transmembrane region 2 of the protein as previously thought. Moreover, we show that these three critical substitutions only increase calcium permeability in the context of the mammalian but not the avian receptor, stressing the relevance of overall protein structure on defining functional properties. These results highlight the importance of tracking evolutionarily acquired changes in protein sequence underlying fundamental functional properties of ligand-gated ion channels.
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Affiliation(s)
- Marcela Lipovsek
- Instituto de Investigaciones en Ingeniería Genética y Biología Molecular, Dr. Héctor N Torres, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
| | - Angélica Fierro
- Department of Organic Chemistry, Faculty of Chemistry, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Edwin G Pérez
- Department of Organic Chemistry, Faculty of Chemistry, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Juan C Boffi
- Instituto de Investigaciones en Ingeniería Genética y Biología Molecular, Dr. Héctor N Torres, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
| | - Neil S Millar
- Department of Neuroscience, Physiology and Pharmacology, University College London, London, United Kingdom
| | - Paul A Fuchs
- Department of Otolaryngology, Head and Neck Surgery, and Center for Hearing and Balance, The Johns Hopkins University School of Medicine, Baltimore, MD
| | - Eleonora Katz
- Instituto de Investigaciones en Ingeniería Genética y Biología Molecular, Dr. Héctor N Torres, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina Departamento de Fisiología, Biología Molecular y Celular, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Ana Belén Elgoyhen
- Instituto de Investigaciones en Ingeniería Genética y Biología Molecular, Dr. Héctor N Torres, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina Departamento de Farmacología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
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Aliaga ME, Tiznado W, Cassels BK, Nuñez MT, Millán D, Pérez EG, García-Beltrán O, Pavez P. Substituent effects on reactivity of 3-cinnamoylcoumarins with thiols of biological interest. RSC Adv 2014. [DOI: 10.1039/c3ra44695f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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Arias HR, López JJ, Feuerbach D, Fierro A, Ortells MO, Pérez EG. Novel 2-(substituted benzyl)quinuclidines inhibit human α7 and α4β2 nicotinic receptors by different mechanisms. Int J Biochem Cell Biol 2013; 45:2420-30. [DOI: 10.1016/j.biocel.2013.08.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 07/11/2013] [Accepted: 08/06/2013] [Indexed: 01/12/2023]
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Areche C, Rojas-Alvarez F, Campos-Briones C, Lima C, Pérez EG, Sepúlveda B. Further mulinane diterpenoids from Azorella compacta. ACTA ACUST UNITED AC 2013; 65:1231-8. [PMID: 23837591 DOI: 10.1111/jphp.12083] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Accepted: 04/11/2013] [Indexed: 11/29/2022]
Abstract
OBJECTIVES The chemical study of a dichloromethane extract from Azorella compacta was directed to the isolation of characteristic mulinane and azorellane diterpenoids in order to determine their gastroprotective activity. METHODS Usual chromatographic techniques on the extract led to the isolation of 12 compounds, which were identified by their spectroscopic properties. The HCl/ethanol-induced gastric lesions model in mice was used to determine the gastroprotective activity. KEY FINDINGS The new diterpenoids, 13β-hydroxymulinane (1), mulin-11,13-dien-20-ol (2), 13α-methoxyazorellanol (3) and mulin-11,13-dien-18-acetoxy-16,20-dioic acid (12) were isolated from A. compacta. The known diterpenoids mulin-11,13-dien-20-oic acid (4), 13α-hydroxyazorellane (5), 13β-hydroxyazorellane (6), mulinic acid (7), mulinolic acid (8) and azorellanol (9), and the aromatic compounds 5,7-dihydroxychromone (10) and isoflavonoid biochanin A (11), were also obtained from the extract. Compounds 6, 9 and 12 at 20 mg/kg reduced gastric lesions by 69%, 71% and 73%, respectively, being statistically similar to lansoprazole at the same dose. CONCLUSIONS The results corroborate the intraspecific chemical variations detected previously in specimens of A. compacta collected at different Chilean latitudes. A high concentration of azorellanol (9) could account in part for some of the therapeutic properties attributed to this species, in particular in ulcer treatment. Most of the mulinane and azorellane diterpenoids isolated in this study showed relevant gastroprotective activity at a low dose in the bioassay.
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Affiliation(s)
- Carlos Areche
- Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile.
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Pérez EG, Ocampo C, Feuerbach D, López JJ, Morelo GL, Tapia RA, Arias HR. Novel 1-(1-benzyl-1H-indol-3-yl)-N,N,N-trimethylmethanaminium iodides are competitive antagonists for the human α4β2 and α7 nicotinic acetylcholine receptors. Med Chem Commun 2013. [DOI: 10.1039/c3md00042g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Castro-Castillo V, Suárez-Rozas C, Pabón A, Pérez EG, Cassels BK, Blair S. Synthesis and antiplasmodial activity of some 1-azabenzanthrone derivatives. Bioorg Med Chem Lett 2012; 23:327-9. [PMID: 23164712 DOI: 10.1016/j.bmcl.2012.10.092] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 10/17/2012] [Accepted: 10/19/2012] [Indexed: 11/27/2022]
Abstract
Some synthetic 1-azabenzanthrones (7H-dibenzo[de,h]quinolin-7-ones) are weakly to moderately cytotoxic, suggesting that they might also show antiparasitic activity. We have now tested a small collection of these compounds in vitro against a chloroquine-resistant Plasmodium falciparum strain, comparing their cytotoxicity against normal human fibroblasts. Our results indicate that 5-methoxy-1-azabenzanthrone and its 2,3-dihydro analogue have low micromolar antiplasmodial activities and showed more than 10-fold selectivity against the parasite, indicating that the dihydro compound, in particular, might serve as a lead compound for further development.
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Affiliation(s)
- Vicente Castro-Castillo
- Faculty of Basic Sciences, Metropolitan Educational Sciences University, Avenida J.P. Alessandri 774, Ñuñoa, Santiago 7760197, Chile.
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García-Beltrán O, González C, Pérez EG, Cassels BK, Santos JG, Millán D, Mena N, Pavez P, Aliaga ME. Nucleophilic reactivity of biothiols toward coumarin-based derivatives containing a chalcone moiety. J PHYS ORG CHEM 2012. [DOI: 10.1002/poc.2975] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Olimpo García-Beltrán
- Department of Chemistry, Faculty of Sciences; University of Chile; Santiago Chile
- Departamento de Ciencias Químicas, Facultad de Ciencias Exactas; Universidad Andrés Bello; Avenida República 275, Piso 3 Santiago Chile
| | - Christopher González
- Facultad de Química; Pontificia Universidad Católica de Chile; Av. Vicuña Mackenna 4860 Santiago 6094411 Chile
| | - Edwin G. Pérez
- Facultad de Química; Pontificia Universidad Católica de Chile; Av. Vicuña Mackenna 4860 Santiago 6094411 Chile
| | - Bruce K. Cassels
- Department of Chemistry, Faculty of Sciences; University of Chile; Santiago Chile
- Institute for Cell Dynamics and Biotechnology; University of Chile; Santiago Chile
| | - José G. Santos
- Facultad de Química; Pontificia Universidad Católica de Chile; Av. Vicuña Mackenna 4860 Santiago 6094411 Chile
| | - Daniela Millán
- Facultad de Química; Pontificia Universidad Católica de Chile; Av. Vicuña Mackenna 4860 Santiago 6094411 Chile
| | - Natalia Mena
- Department of Biology, Faculty of Sciences; University of Chile; Santiago Chile
| | - Paulina Pavez
- Facultad de Química; Pontificia Universidad Católica de Chile; Av. Vicuña Mackenna 4860 Santiago 6094411 Chile
| | - Margarita E. Aliaga
- Facultad de Química; Pontificia Universidad Católica de Chile; Av. Vicuña Mackenna 4860 Santiago 6094411 Chile
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Pérez EG, Cassels BK, Eibl C, Gündisch D. Synthesis and evaluation of N1-alkylindole-3-ylalkylammonium compounds as nicotinic acetylcholine receptor ligands. Bioorg Med Chem 2012; 20:3719-27. [DOI: 10.1016/j.bmc.2012.04.050] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2011] [Revised: 04/17/2012] [Accepted: 04/25/2012] [Indexed: 10/28/2022]
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Pérez EG, Méndez-Gálvez C, Cassels BK. Cytisine: a natural product lead for the development of drugs acting at nicotinic acetylcholine receptors. Nat Prod Rep 2012; 29:555-67. [DOI: 10.1039/c2np00100d] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Iglesias Á, Pérez EG, Muñiz K. Eine intermolekulare Palladium-katalysierte vicinale Diaminierung von nichtaktivierten Alkenen. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201003653] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Iturriaga-Vásquez P, Pérez EG, Slater EY, Bermúdez I, Cassels BK. Aporphine metho salts as neuronal nicotinic acetylcholine receptor blockers. Bioorg Med Chem 2007; 15:3368-72. [PMID: 17391965 DOI: 10.1016/j.bmc.2007.03.023] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2006] [Revised: 02/24/2007] [Accepted: 03/08/2007] [Indexed: 11/26/2022]
Abstract
(S)-Aporphine metho salts with the 1,2,9,10 oxygenation pattern displaced radioligands from recombinant human alpha7 and alpha4beta2 neuronal nicotinic acetylcholine receptors (nAChR) at low micromolar concentrations. The affinity of the nonphenolic glaucine methiodide (4) (vs [(3)H]cytisine) was the lowest at alpha4beta2 nAChR (K(i)=10 microM), and predicentrine methiodide (2) and xanthoplanine iodide (3), with free hydroxyl groups at C-2 or C-9, respectively, had the highest affinity at these receptors (K(i) approximately 1 microM), while the affinity of the diphenolic boldine methiodide (1) was intermediate between these values. At homomeric alpha7 nAChR, xanthoplanine had the highest affinity (K(i)=10 microM) vs [(125)I]alpha-bungarotoxin while the other three compounds displaced the radioligand with K(i) values between 15 and 21 microM. At 100 microM, all four compounds inhibited the responses of these receptors to EC(50) concentrations of ACh. The effects of xanthoplanine iodide (3) were studied in more detail. Xanthoplanine fully inhibited the EC(50) ACh responses of both alpha7 and alpha4beta2 nACh receptors with estimated IC(50) values of 9+/-3 microM (alpha7) and 5+/-0.8 microM (alpha4beta2).
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