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Erazo-Torricelli R, Arce C, Alcalde E, Urtizberea A, Reinbach K, Bertini E, Carrasco J, Gomez P. CONGENITAL MYOPATHIES. Neuromuscul Disord 2021. [DOI: 10.1016/j.nmd.2021.07.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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2
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Sepulveda W, Sepulveda F, Gonzalez G, Arce C, Alcalde E. Congenital hepatic cyst: Prenatal and postnatal imaging findings. Ultrasound 2021; 29:193-198. [PMID: 34567232 DOI: 10.1177/1742271x20970601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 10/04/2020] [Indexed: 12/23/2022]
Abstract
Introduction Congenital hepatic cyst is a rare hepatobiliary malformation that can present as an asymptomatic, unilocular, upper abdominal cystic mass in the fetus. Cases We report two cases of congenital hepatic cyst in which the diagnosis was made by prenatal ultrasound at 25 and 33 weeks' gestation. The diagnosis was confirmed postnatally by abdominal ultrasound and radiologic imaging studies. Although the infants remained asymptomatic, laparoscopic excision was performed due to the increasing size of the cyst in both cases. Pathological examination of the resected specimens confirmed a simple cyst in one case and an epidermoid cyst in the other. Conclusions Our cases and those described in the literature demonstrate the usefulness of incidental prenatal detection of congenital hepatic cyst, especially during late pregnancy. Such a diagnosis can allow for proper perinatal surveillance, selection of the route of delivery, and timely postnatal surgical intervention if required.
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Affiliation(s)
- Waldo Sepulveda
- FETALMED Maternal-Fetal Diagnostic Center, Fetal Imaging Unit, Santiago, Chile
| | - Francisco Sepulveda
- FETALMED Maternal-Fetal Diagnostic Center, Fetal Imaging Unit, Santiago, Chile
| | - Gloria Gonzalez
- Department of Surgery, 'Luis Calvo Mackenna' Children Hospital, National Health Service, Santiago, Chile
| | - Claudio Arce
- Department of Pathology, 'Luis Calvo Mackenna' Children Hospital, National Health Service, Santiago, Chile
| | - Elisa Alcalde
- Department of Pathology, 'Luis Calvo Mackenna' Children Hospital, National Health Service, Santiago, Chile
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3
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Ríos JA, Alcalde E, Ramírez E, Campbell M, Labbé TP, Becerra S, Santander S, Cabrera ME. [The implementation of a Biobank network for Chile]. Rev Med Chil 2020; 147:901-909. [PMID: 31859989 DOI: 10.4067/s0034-98872019000700901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Accepted: 05/23/2019] [Indexed: 11/17/2022]
Abstract
The concept "Biobank" is relatively new in the scientific literature, and is not yet consensually defined, even for the World Health Organization (WHO). However, the use of human samples in biomedical research is a very old activity. The organized development of Biobanks in different places has grown in the last decade. The experience in different countries and continents has been diverse. In this special article we intend to summarize, organize and communicate to the national medical and scientific community, (i) the concept of Biobank, (ii) the international experience and a map of the Research Biobanks working in Chile, (iii) the basic biomedical and essential operational aspects to manage a Biobank for Research and (iv) the impact of a National Network of Biobanks implementation in the Chilean Health System. Ethical and regulatory aspects will not be included, given their intrinsic complexity, which should be discussed elsewhere.
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Affiliation(s)
- Juvenal A Ríos
- Escuela de Medicina, Facultad de Medicina y Ciencia, Universidad San Sebastián, Santiago, Chile
| | - Elisa Alcalde
- Servicio de Anatomía Patológica, Hospital Luis Calvo Mackenna, Santiago, Chile
| | - Eugenio Ramírez
- Sección Virus Oncogénicos, Instituto de Salud Pública, Santiago, Chile
| | - Myriam Campbell
- Programa Nacional de Cáncer del Niño, Hospital Roberto del Río, Santiago, Chile
| | - Tomas P Labbé
- Departamento de Enfermedades No Transmisibles, Ministerio de Salud, Santiago, Chile
| | - Sergio Becerra
- Departamento de Manejo Integral de Cáncer y otros Tumores, Ministerio de Salud, Santiago, Chile
| | - Sylvia Santander
- División de Prevención y Control de Enfermedades Ministerio de Salud, Santiago, Chile
| | - María Elena Cabrera
- Departamento de Medicina Interna Oriente, Facultad de Medicina, Universidad de Chile, Santiago, Chile
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4
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Barnafi N, Conca N, von Borries C, Fuentes I, Montoya F, Alcalde E. [Central nervous system infection by Bartonella henselae associated with a choroid plexus papilloma]. Rev Chilena Infectol 2017; 34:383-388. [PMID: 29165519 DOI: 10.4067/s0716-10182017000400383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Accepted: 05/18/2017] [Indexed: 11/17/2022] Open
Abstract
Bartonella henselae infection is a prevalent illness in Chile. It presents generally as a cat scratch disease or as a prolonged fever syndrome. There are atypical manifestations, which include central nervous system, bone, cardiac and hepato-esplenic compromised. We present an adolescent case with a history of fever, vomiting and ataxia, whose diagnosis was a central nervous system infection by Bartonella henselae associated with a choroid plexus papilloma. This case corresponds to an unusual presentation, with a challenging diagnosis. It is controversial whether to treat this patient, which antimicrobial is the right choice and how long the treatment should be.
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Affiliation(s)
| | - Natalia Conca
- Departamento de Pediatría y Cirugía Infantil Campus Oriente, Facultad de Medicina, Universidad de Chile, Chile
| | | | | | - Francisca Montoya
- Neurología Adulto y Neurorradiología, Instituto de Neurocirugía, Chile
| | - Elisa Alcalde
- Anatomía Patológica, Hospital Luis Calvo Mackenna, Chile
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5
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Lucero Y, Oyarzún A, O'Ryan M, Quera R, Espinosa N, Valenzuela R, Simian D, Alcalde E, Arce C, Farfán MJ, Vergara AF, Gajardo I, Mendez J, Carrasco J, Errázuriz G, González M, Ossa JC, Maiza E, Perez-Bravo F, Castro M, Araya M. Corrigendum: Helicobacter pylori cagA+ Is Associated with Milder Duodenal Histological Changes in Chilean Celiac Patients. Front Cell Infect Microbiol 2017; 7:427. [PMID: 28983475 PMCID: PMC5627282 DOI: 10.3389/fcimb.2017.00427] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 09/19/2017] [Indexed: 11/13/2022] Open
Abstract
[This corrects the article on p. 376 in vol. 7, PMID: 28879170.].
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Affiliation(s)
- Yalda Lucero
- Department of Pediatrics and Pediatric Surgery, Faculty of Medicine, University of Chile, Santiago, Chile.,Microbiology and Micology Program, ICBM, Faculty of Medicine, University of Chile, Santiago, Chile.,Pediatric Gastroenterology Unit, Department of Pediatrics, Clínica Alemana-Universidad del Desarrollo, Santiago, Chile
| | - Amaya Oyarzún
- Laboratory of Immunegenetics, Institute of Nutrition and Food Technology, University of Chile, Santiago, Chile
| | - Miguel O'Ryan
- Microbiology and Micology Program, ICBM, Faculty of Medicine, University of Chile, Santiago, Chile.,Millenium Institute of Immunology and Immunotherapy, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Rodrigo Quera
- Department of Gastroenterology, Clínica Las Condes, Santiago, Chile
| | | | - Romina Valenzuela
- Department of Pediatrics and Pediatric Surgery, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Daniela Simian
- Department of Gastroenterology, Clínica Las Condes, Santiago, Chile
| | | | - Claudio Arce
- Hospital Dr. Luis Calvo Mackenna, Santiago, Chile
| | - Mauricio J Farfán
- Department of Pediatrics and Pediatric Surgery, Faculty of Medicine, University of Chile, Santiago, Chile.,Hospital Dr. Luis Calvo Mackenna, Santiago, Chile
| | | | - Iván Gajardo
- Department of Pediatrics and Pediatric Surgery, Faculty of Medicine, University of Chile, Santiago, Chile
| | | | | | - Germán Errázuriz
- Department of Gastroenterology, Clínica Las Condes, Santiago, Chile
| | | | - Juan C Ossa
- Department of Pediatrics and Pediatric Surgery, Faculty of Medicine, University of Chile, Santiago, Chile
| | | | | | - Magdalena Castro
- Department of Gastroenterology, Clínica Las Condes, Santiago, Chile
| | - Magdalena Araya
- Laboratory of Immunegenetics, Institute of Nutrition and Food Technology, University of Chile, Santiago, Chile
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6
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Lucero Y, Oyarzún A, O'Ryan M, Quera R, Espinosa N, Valenzuela R, Simian D, Alcalde E, Arce C, Farfán MJ, Vergara AF, Gajardo I, Mendez J, Carrasco J, Errázuriz G, Gonzalez M, Ossa JC, Maiza E, Perez-Bravo F, Castro M, Araya M. Helicobacter pylori cagA+ Is Associated with Milder Duodenal Histological Changes in Chilean Celiac Patients. Front Cell Infect Microbiol 2017; 7:376. [PMID: 28879170 PMCID: PMC5572207 DOI: 10.3389/fcimb.2017.00376] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 05/31/2017] [Accepted: 08/08/2017] [Indexed: 12/14/2022] Open
Abstract
HIGHLIGHTSWhat is already known about this subject? Celiac disease (CD) has a high clinical and histological diversity and the mechanisms underlying this phenomenon remain elusive. H. pylori is a bacterium that chronically infect gastric and duodenal mucosa activating both a Th1/Th17 and T-reg pathways. The role of H. pylori (and the effect of their virulence factors) in CD have not yet completely elucidated. What are the new findings? cagA+ H. pylori strains are associated to milder histological damage in infected CD patients. In active-CD patients the presence of cagA+ H. pylori is associated to an increase in T-reg markers, contrasting with a downregulation in cagA+ infected potential-CD individuals. How might it impact on clinical practice in the foreseeable future? The identification of microbiological factors that could modulate inflammation and clinical expression of CD may be used in the future as preventive strategies or as supplementary treatment in patients that cannot achieve complete remission, contributing to the better care of these patients.
Background: Mechanisms underlying the high clinical and histological diversity of celiac disease (CD) remain elusive. Helicobacter pylori (Hp) chronically infects gastric and duodenal mucosa and has been associated with protection against some immune-mediated conditions, but its role (specifically of cagA+ strains) in CD is unclear. Objective: To assess the relationship between gastric Hp infection (cagA+ strains) and duodenal histological damage in patients with CD. Design: Case-control study including patients with active-CD, potential-CD and non-celiac individuals. Clinical presentation, HLA genotype, Hp/cagA gene detection in gastric mucosa, duodenal histology, Foxp3 positive cells and TGF-β expression in duodenal lamina propria were analyzed. Results: We recruited 116 patients, 29 active-CD, 37 potential-CD, and 50 non-CD controls. Hp detection was similar in the three groups (~30–40%), but cagA+ strains were more common in infected potential-CD than in active-CD (10/11 vs. 4/10; p = 0.020) and non-CD (10/20; p = 0.025). Among active-CD patients, Foxp3 positivity was significantly higher in subjects with cagA+ Hp+ compared to cagA- Hp+ (p < 0.01) and Hp- (p < 0.01). In cagA+ Hp+ individuals, Foxp3 positivity was also higher comparing active- to potential-CD (p < 0.01). TGF-β expression in duodenum was similar in active-CD with cagA+ Hp+ compared to Hp- and was significantly downregulated in cagA+ potential-CD subjects compared to other groups. Conclusion: Hp infection rates were similar among individuals with/without CD, but infection with cagA+ strains was associated with milder histological damage in celiac patients infected by Hp, and in active-CD cases with higher expression of T-reg markers. Results suggest that infection by cagA+ Hp may be protective for CD progression, or conversely, that these strains are prone to colonize intestinal mucosa with less severe damage.
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Affiliation(s)
- Yalda Lucero
- Hospital Dr. Luis Calvo MackennaSantiago, Chile.,Department of Pediatrics and Pediatric Surgery, Faculty of Medicine, University of ChileSantiago, Chile.,Microbiology and Micology Program, Faculty of Medicine, University of ChileSantiago, Chile
| | - Amaya Oyarzún
- Laboratory of Immunegenetics, Institute of Nutrition and Food Technology, University of ChileSantiago, Chile
| | - Miguel O'Ryan
- Microbiology and Micology Program, Faculty of Medicine, University of ChileSantiago, Chile.,Millenium Institute of Immunology and Immunotherapy, Faculty of Medicine, University of ChileSantiago, Chile
| | - Rodrigo Quera
- Department of Gastroenterology, Clínica Las CondesSantiago, Chile
| | | | - Romina Valenzuela
- Department of Pediatrics and Pediatric Surgery, Faculty of Medicine, University of ChileSantiago, Chile
| | - Daniela Simian
- Department of Gastroenterology, Clínica Las CondesSantiago, Chile
| | | | | | - Mauricio J Farfán
- Hospital Dr. Luis Calvo MackennaSantiago, Chile.,Department of Pediatrics and Pediatric Surgery, Faculty of Medicine, University of ChileSantiago, Chile
| | | | - Iván Gajardo
- Department of Pediatrics and Pediatric Surgery, Faculty of Medicine, University of ChileSantiago, Chile
| | | | | | - Germán Errázuriz
- Department of Gastroenterology, Clínica Las CondesSantiago, Chile
| | | | - Juan C Ossa
- Hospital Dr. Luis Calvo MackennaSantiago, Chile.,Department of Pediatrics and Pediatric Surgery, Faculty of Medicine, University of ChileSantiago, Chile
| | | | | | - Magdalena Castro
- Millenium Institute of Immunology and Immunotherapy, Faculty of Medicine, University of ChileSantiago, Chile
| | - Magdalena Araya
- Microbiology and Micology Program, Faculty of Medicine, University of ChileSantiago, Chile
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7
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Smets G, Alcalde E, Andres D, Carron D, Delzenne P, Heise A, Legris G, Martinez Parrilla M, Verhaert J, Wandelt C, Ilegems M, Rüdelsheim P. The use of existing environmental networks for the post-market monitoring of GM crop cultivation in the EU. Environ Sci Process Impacts 2014; 16:1754-1763. [PMID: 24836113 DOI: 10.1039/c4em00093e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The European Union (EU) Directive 2001/18/EC on the deliberate release of genetically modified organisms (GMOs) into the environment requires that both Case-Specific Monitoring (CSM) and General Surveillance (GS) are considered as post-market implementing measures. Whereas CSM is directed to monitor potential adverse effects of GMOs or their use identified in the environmental risk assessment, GS aims to detect un-intended adverse effects of GMOs or their use on human and animal health or the environment. Guidance documents on the monitoring of genetically modified (GM) plants from the Commission and EFSA clarify that, as appropriate, GS can make use of established routine surveillance practices. Networks involved in routine surveillance offer recognised expertise in a particular domain and are designed to collect information on important environmental aspects over a large geographical area. However, as the suitability of existing monitoring networks to provide relevant data for monitoring impacts of GMOs is not known, plant biotechnology companies developed an approach to describe the processes and criteria that will be used for selecting and evaluating existing monitoring systems. In this paper, the availability of existing monitoring networks for this purpose is evaluated. By cataloguing the existing environmental monitoring networks in the EU, it can be concluded that they can only be used, in the context of GMO cultivation monitoring, as secondary tools to collect baseline information.
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8
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Magaña C, Núñez-Sánchez N, Fernández-Cabanás VM, García P, Serrano A, Pérez-Marín D, Pemán JM, Alcalde E. Direct prediction of bioethanol yield in sugar beet pulp using near infrared spectroscopy. Bioresour Technol 2011; 102:9542-9. [PMID: 21872469 DOI: 10.1016/j.biortech.2011.07.045] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Revised: 07/08/2011] [Accepted: 07/15/2011] [Indexed: 05/09/2023]
Abstract
Sugar beets are a raw material for the production of sugar and ethanol. The decision on which end product to pursue could be facilitated by fast and reliable means of predicting the potential ethanol yield from the beets. A Near Infrared (NIR) Spectroscopy-based approach was tested for the direct prediction of the potential bioethanol production from sugar beets. A modified partial least squares (MPLS) regression model was applied to 125 samples, ranging from 21.9 to 31.0 gL(-1) of bioethanol in sugar beet brei. The samples were analyzed in reflectance mode in a Direct Contact Food Analyser (DCFA) FOSS-NIRSystems 6500 monochromator, with standard error of cross validation (SECV), standard error of prediction (SEP), coefficient of determination (r(2)) and coefficient of variation (CV) of 0.51, 0.49, 0.91 and 1.9 gL(-1), respectively. The NIR technique allowed direct prediction of the ethanol yield from sugar beet brei (i.e. the product obtained after sawing beets with a proper machine) in less than 3 min.
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Affiliation(s)
- C Magaña
- Syngenta Seeds S.A., Barcelona 08006, Spain
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9
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Fayet JP, Vertut MC, Mauret P, Claramunt RM, Elguero J, Alcalde E. Étude de la conformation et de la tautomérie des azidoazoles par dipolemétrie. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19780870305] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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10
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Alcalde E, Cámara M. General surveillance of GMOs, open questions. N Biotechnol 2009. [DOI: 10.1016/j.nbt.2009.06.544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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Ibarra A, Matamala P, Urrutia J, Alcalde E. UP.14: Malignant Renal Mesenchymoma. Urology 2008. [DOI: 10.1016/j.urology.2008.08.337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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12
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Abstract
A convergent "5 + 1" and "5 + 3" synthetic strategy allowed the synthesis of the first examples of bis-betaines 2 and 3, a prototype of phanes that incorporate heterocyclic betaines. The structure of the quadrupolar macrocyclic systems 2 and 3 together with the dicationic [1(6)]- and [1(8)] meta-heterophane precursors 5*2X and 6*2X were examined by spectroscopy using 1H and 13C NMR techniques together with 1H-DNMR studies and electrospray ionization mass spectrometry.
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Affiliation(s)
- E Alcalde
- Laboratori de Química Orgànica, Facultat de Farmàcia, Universitat de Barcelona, 08028-Barcelona, Spain.
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13
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Alcalde E, Ayala C, Dinarès I, Mesquida N. Polynucleating open-chain systems with imidazole and proton-ionizable 1,2,4-triazole structural motifs. J Org Chem 2001; 66:2291-5. [PMID: 11281768 DOI: 10.1021/jo0056794] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A multistep route for obtaining the polynucleating open-chain systems 3-5 is reported. These advanced intermediates required elaborate processes that proceeded for the pentanuclear protophanes 3 in seven steps, whereas the trinuclear compounds 4 and 5 were obtained in six steps
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Affiliation(s)
- E Alcalde
- Laboratori de Química Orgànica, Facultat de Farmàcia, Universitat de Barcelona, 08028-Barcelona, Spain.
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14
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Alcalde E, Mesquida N, Vilaseca M. Imidazolium molecular motifs located on dicationic frameworks. Electrospray mass spectrometric observation of carbenes: imidazolylidenes. Rapid Commun Mass Spectrom 2000; 14:1443-1447. [PMID: 10931535 DOI: 10.1002/1097-0231(20000830)14:16<1443::aid-rcm43>3.0.co;2-h] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Electrospray ionization mass spectral analysis of simple dicationic imidazolium prototypes (M.2X) is reported and direct observation was obtained for proton-mediated ion-molecule reactions in the gas phase. The comparative ESI-MS study with heterophanes 1a.2Cl and 3.2Br, the open chain system 5.2Br, and their regiospecific deuterated counterparts 2a.2Cl, 4.2Br and 6.2Br showed that the nature of the frameworks containing two imidazolium subunits modulates their electrospray ionization, changing the stability of the common characteristic peaks: the carbene specie [M - H](+) or [M - D](+) as well as [M](2+) and [M. X](+).Copyright 2000 John Wiley & Sons, Ltd.
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Affiliation(s)
- E Alcalde
- Laboratori de Quimica Organica, Facultat de Farmacia, Divisio IV, Universitat de Barcelona, E-08028 Barcelona, Spain
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15
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Abstract
Electrospray ionization mass spectrometry has been used to investigate simple multicharged [1(4)]heterophanes containing heterocyclic betaine subunits as building blocks. The formation of stable noncovalent polymolecular self-assembled structures in the gas phase is reported.
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Affiliation(s)
- E Alcalde
- Laboratori de Química Orgánica, Facultat de Farmácia, Universitat de Barcelona, E-08028 Barcelona, Spain.
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16
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Alcalde E, Barat A, Goya P, Martinez A, Ramirez G, Roca T, Rozas I. Molecular modeling of (E)-1-alkyl-4(3)-[2-(1H-azolyl)vinyl]-pyridinium salts and evaluation of their behavior towards choline acetyltransferase. Bioorg Med Chem 1997; 5:949-54. [PMID: 9208104 DOI: 10.1016/s0968-0896(97)00033-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A new type of extended pi-system aza-analogue of (E)-4-[2-(1-naphthylvinyl)]-1-substituted pyridinium salts (NVP+) has been designed and its inhibitory activity towards choline acetyltransferase (ChAT) has been evaluated in vitro. Among the several examples of the title quaternary salts synthesized 2 and 3, the indolylvinylpyridinium salt 2e is the only one to show a very low ChAT inhibition. The molecular modeling study is highly illustrative of their behavior towards ChAT and interaction with the recognition site. Thus, several selected cations together with the reference NVP+ compound 1a were studied at the PM3 and AM1 levels respectively. At the global minima, all the compounds are planar, which, from the electron charge distribution, shows a degree of polarization similar to the NVP+ model compound 1a. However, the fitting of all optimized structures indicated that only the indole derivative 2e showed the same aromatic fragment orientation as 1a, which allows us to define a volume that is not accessible to ligands in the enzyme and consequently to a refined model of the choline acetyltransferase recognition site.
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Affiliation(s)
- E Alcalde
- Laboratorio de Química Orgánica, Facultad de Farmacia, Barcelona, Spain
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17
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Alcalde E, Dinarés I, Pérez-García L. Heterocyclic betaines containing pi-deficient and pi-excessive moieties. Synthetic and biological aspects. Farmaco 1996; 51:381-93. [PMID: 8766221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- E Alcalde
- Laberatorio de Química Orgánica, Facultad de Farmacia, Universidad de Barcelona, Spain
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18
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Alcalde E, Pérez-García L, Dinarés I, Frigola J. Heterocyclic betaines. XXII. Azinium(azolium) 4-nitrobenzimidazolate inner salts and their derivatives with several interannular spacers. Synthesis, characterization and antitrichomonal activity. Chem Pharm Bull (Tokyo) 1995; 43:493-8. [PMID: 7774033 DOI: 10.1248/cpb.43.493] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The synthesis of an ensemble of pyridinium(imidazolium) 4-nitrobenzimidazolate betaines and their derivatives with several interannular linkages has been explored. Their antiprotozoal activity has also been examined.
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Affiliation(s)
- E Alcalde
- Laboratorio de Química Orgánica, Facultad de Farmacia, Universidad de Barcelona, Spain
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19
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Alcalde E, Pérez-García L, Dinarés I, Coombs GH, Frigola J. Synthesis and antitrichomonal activity of azinium (azolium) 4-nitrobenzimidazolate betaines and their derivatives. Eur J Med Chem 1992. [DOI: 10.1016/0223-5234(92)90107-c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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Alcalde E, Dinarés I, Frigola J. NMR studies of N-(benzimidazol-2-yl)pyridinium derivatives: QSAR with the anti-leishmanial activity and their carbon-13 NMR chemical shifts. Eur J Med Chem 1991. [DOI: 10.1016/0223-5234(91)90199-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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Alcalde E, Dinarés I, Elguero J, Frigola J, Osuna A, Castanys S. Pyridinium azolate betaines and their derivatives: a new class of antiprotozoal agents. Eur J Med Chem 1990. [DOI: 10.1016/0223-5234(90)90114-i] [Citation(s) in RCA: 16] [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: 11/29/2022]
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Alcalde E, Maños L, Dinares I, Valls N, Elguero J, Escario JA, Martinez AR, Igea A, Osuna A, Ruiz-Perez LM. New derivatives of 5-nitroimidazole: synthesis and antiparasitic activity. Farmaco 1989; 44:1095-107. [PMID: 2701965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The synthesis and the antiparasitic evaluation of twelve new 5-nitroimidaole derivatives has been carried out. The most effective compounds were the less hydrophilic pyridinium and imidazolium salts (IV), (V) and (X), and above all the tetrahydropyridine derivatives (XII) and (XIII).
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Affiliation(s)
- E Alcalde
- Lab. Quimica Organica, Facultad de Farmacia, Universidad de Barcelona, España
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Valls N, Segarra VM, Alcalde E, Marin A, Elguero J. Synthesis, Spectroscopy and Tautomeric Study of Thiazoles substituted in positions 2 and 4 by hydroxy, mercapto and amino groups. ACTA ACUST UNITED AC 1985. [DOI: 10.1002/prac.19853270210] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [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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Alcalde E, Claramunt RM. Aromatic systems with 10 π electrons derived from 3a-azapentalene. XXIV. Synthesis of pyrazolo[1,5-d] tetrazoles. J Heterocycl Chem 1976. [DOI: 10.1002/jhet.5570130237] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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