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Neumann C, Slagboom J, Somsen GW, Vonk F, Casewell NR, Cardoso CL, Kool J. Development of a generic high-throughput screening assay for profiling snake venom protease activity after high-resolution chromatographic fractionation. Toxicon 2020; 178:61-68. [PMID: 32112787 DOI: 10.1016/j.toxicon.2020.02.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 01/22/2020] [Accepted: 02/11/2020] [Indexed: 11/21/2022]
Abstract
Snakebites cause upwards of 1.8 million envenomings, 138,000 deaths and 500,000 cases of long term morbidity each year. Viper snake venoms (family Viperidae) generally contain a high proportion of proteases which can cause devastating effects such as hemorrhage, coagulopathy, edema, necrosis, and severe pain, in envenomed victims. In this study, analytical techniques were combined with enzymatic assays to develop a novel method for the detection of snake venom protease activity by using rhodamine-110-peptide substrate. In the so called at-line nanofractionation set up, crude venoms were first separated with reversed phase liquid chromatography, after which fractions were collected onto 384-well plates. Protease activity assays were then performed in the 384-well plates and bioassay chromatograms were constructed revealing protease activity. Parallel obtained UV absorbance, MS and proteomics data from a previous study facilitated toxin identification. The application of the rhodamine-110-peptide substrate assay showed significantly greater sensitivity compared to prior assays using casein-FITC as the substrate. Moreover, cross referencing UV and MS data and resulted in the detection of a number of tentative proteases suspected to exhibit protease activity, including snake venom serine proteases from Calloselasma rhodostoma and Daboia russelli venom and a snake venom metalloproteinase from the venom of Echis ocellatus. Our data demonstrate that his methodology can be a useful tool for selectively identifying snake venom proteases, and can be applied to provide a better understanding of protease-induced pathologies and the development of novel therapeutics for treating snakebite.
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Affiliation(s)
- Coleen Neumann
- Division of BioAnalytical Chemistry, Department of Chemistry and Pharmaceutical Sciences, Amsterdam Institute of Molecules, Medicines and Systems, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Julien Slagboom
- Division of BioAnalytical Chemistry, Department of Chemistry and Pharmaceutical Sciences, Amsterdam Institute of Molecules, Medicines and Systems, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Govert W Somsen
- Division of BioAnalytical Chemistry, Department of Chemistry and Pharmaceutical Sciences, Amsterdam Institute of Molecules, Medicines and Systems, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Freek Vonk
- Naturalis Biodiversity Center, 2333 CR, Leiden, the Netherlands
| | - Nicholas R Casewell
- Centre for Snakebite Research & Interventions, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, L3 5QA, UK
| | - Carmen L Cardoso
- Departamento de Química, Grupo de Cromatografia de Bioafinidade e Produtos Naturais - Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - Universidade de São Paulo, Brazil
| | - Jeroen Kool
- Division of BioAnalytical Chemistry, Department of Chemistry and Pharmaceutical Sciences, Amsterdam Institute of Molecules, Medicines and Systems, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands.
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Medina RP, Araujo AR, Batista JM, Cardoso CL, Seidl C, Vilela AFL, Domingos HV, Costa-Lotufo LV, Andersen RJ, Silva DHS. Botryane terpenoids produced by Nemania bipapillata, an endophytic fungus isolated from red alga Asparagopsis taxiformis - Falkenbergia stage. Sci Rep 2019; 9:12318. [PMID: 31444403 PMCID: PMC6707159 DOI: 10.1038/s41598-019-48655-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [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: 09/26/2018] [Accepted: 08/08/2019] [Indexed: 01/01/2023] Open
Abstract
A chemical study of the EtOAc extract of Nemania bipapillata (AT-05), an endophytic fungus isolated from the marine red alga Asparagopsis taxiformis - Falkenbergia stage, led to the isolation of five new botryane sesquiterpenes, including the diastereomeric pair (+)-(2R,4S,5R,8S)-(1) and (+)-(2R,4R,5R,8S)-4-deacetyl-5-hydroxy-botryenalol (2), (+)-(2R,4S,5R,8R)-4-deacetyl-botryenalol (3), one pair of diastereomeric botryane norsesquiterpenes bearing an unprecedented degraded carbon skeleton, (+)-(2R,4R,8R)-(4) and (+)-(2R,4S,8S)-(5), which were named nemenonediol A and nemenonediol B, respectively, in addition to the known 4β-acetoxy-9β,10β,15α-trihydroxyprobotrydial (6). Their structures were elucidated using 1D and 2D NMR, HRESIMS and comparison with literature data of similar known compounds. The absolute configurations of 2, 3 and 4 were deduced by comparison of experimental and calculated electronic circular dichroism (ECD) spectra, while those of 1 and 5 were assigned from vibrational circular dichroism (VCD) data. Compound 4 weakly inhibited acetylcholinesterase, whereas compound 1 inhibited both acetylcholinesterase and butyrylcholinesterase. Compounds 1, 3, 5 and 6 were tested against two carcinoma cell lines (MCF-7 and HCT-116), but showed no significant citotoxicity at tested concentrations (IC50 > 50 µM).
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Affiliation(s)
- Rebeca P Medina
- Núcleo de Bioensaios, Biossíntese e Ecofisiologia de Produtos Naturais (NuBBE), Departamento de Química Orgânica, Instituto de Química, UNESP - Universidade Estadual Paulista, 14801-970, Araraquara-SP, Brazil
| | - Angela R Araujo
- Núcleo de Bioensaios, Biossíntese e Ecofisiologia de Produtos Naturais (NuBBE), Departamento de Química Orgânica, Instituto de Química, UNESP - Universidade Estadual Paulista, 14801-970, Araraquara-SP, Brazil
| | - João M Batista
- Departamento de Química, Centro de Ciências Exatas e de Tecnologia, Universidade Federal de São Carlos - UFSCar, 13565-905, São Carlos-SP, Brazil.,Departamento de Ciência e Tecnologia, Universidade Federal de São Paulo -UNIFESP, 12231-280, São José dos Campos-SP, Brazil
| | - Carmen L Cardoso
- Grupo de Cromatografia de Bioafinidade e Produtos Naturais, Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901, Ribeirão Preto-SP, Brazil
| | - Cláudia Seidl
- Grupo de Cromatografia de Bioafinidade e Produtos Naturais, Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901, Ribeirão Preto-SP, Brazil
| | - Adriana F L Vilela
- Grupo de Cromatografia de Bioafinidade e Produtos Naturais, Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901, Ribeirão Preto-SP, Brazil
| | - Helori V Domingos
- Instituto de Ciências Biomédicas, Universidade de São Paulo, 05508-900, São Paulo-SP, Brazil
| | - Leticia V Costa-Lotufo
- Instituto de Ciências Biomédicas, Universidade de São Paulo, 05508-900, São Paulo-SP, Brazil
| | - Raymond J Andersen
- Departments of Chemistry and Earth, Ocean & Atmospheric Sciences, University of British Columbia, V6T 1Z1, Vancouver, BC, Canada
| | - Dulce H S Silva
- Núcleo de Bioensaios, Biossíntese e Ecofisiologia de Produtos Naturais (NuBBE), Departamento de Química Orgânica, Instituto de Química, UNESP - Universidade Estadual Paulista, 14801-970, Araraquara-SP, Brazil.
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Queiroz AM, Carvalho AB, Censi LL, Cardoso CL, Leite-Panissi CR, da Silva RAB, de Carvalho FK, Nelson-Filho P, da Silva LAB. Stress and anxiety in children after the use of computerized dental anesthesia. Braz Dent J 2017. [PMID: 26200158 DOI: 10.1590/0103-6440201300211] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to evaluate the transitory stress levels and the anxiety state in children submitted to conventional and computerized dental anesthesia. Twenty children (7 to 12 years) were randomly assigned to receive conventional and computerized dental anesthesia. To investigate the hypothesis that transitory stress could be lower after using computerized anesthesia compared to conventional anesthesia, cortisol levels in saliva were measured before and after each technique. Anxiety was also evaluated individually by answering the State-Trait Anxiety Inventory for Children (STAIC). Numerical data were analyzed statistically by the Mann-Whitney non-parametric test (5% significance level). Salivary cortisol levels increased in 8 (40%) patients after conventional anesthesia and in 9 (45%) patients after computerized anesthesia, with no statistically significant difference between the two types (p=0.34). In the same way, no statistically significant difference was found between the techniques (p=0.39) related to the psychological analysis based on the STAIC scores. Local anesthesia using either conventional anesthesia or a computerized delivery system produced similar level of stress/anxiety in pediatric patients, using both quantitative and qualitative analyses.
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Affiliation(s)
- Alexandra M Queiroz
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - Ariany B Carvalho
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - Laís L Censi
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - Carmen L Cardoso
- Department of Psychology and Education, School of Philosophy, Sciences and Letters of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - Christie R Leite-Panissi
- Department of Morphology, Phisiology and Basic Pathology, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - Raquel Assed Bezerra da Silva
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - Fabricio Kitazono de Carvalho
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - Paulo Nelson-Filho
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - Lea Assed Bezerra da Silva
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
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Mantoani SP, Chierrito TPC, Vilela AFL, Cardoso CL, Martínez A, Carvalho I. Novel Triazole-Quinoline Derivatives as Selective Dual Binding Site Acetylcholinesterase Inhibitors. Molecules 2016; 21:molecules21020193. [PMID: 26861273 PMCID: PMC6273213 DOI: 10.3390/molecules21020193] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [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: 12/10/2015] [Revised: 01/30/2016] [Accepted: 02/02/2016] [Indexed: 11/22/2022] Open
Abstract
Alzheimer’s disease (AD) is the most prevalent neurodegenerative disorder worldwide. Currently, the only strategy for palliative treatment of AD is to inhibit acetylcholinesterase (AChE) in order to increase the concentration of acetylcholine in the synaptic cleft. Evidence indicates that AChE also interacts with the β-amyloid (Aβ) protein, acting as a chaperone and increasing the number and neurotoxicity of Aβ fibrils. It is known that AChE has two binding sites: the peripheral site, responsible for the interactions with Aβ, and the catalytic site, related with acetylcholine hydrolysis. In this work, we reported the synthesis and biological evaluation of a library of new tacrine-donepezil hybrids, as a potential dual binding site AChE inhibitor, containing a triazole-quinoline system. The synthesis of hybrids was performed in four steps using the click chemistry strategy. These compounds were evaluated as hAChE and hBChE inhibitors, and some derivatives showed IC50 values in the micro-molar range and were remarkably selective towards hAChE. Kinetic assays and molecular modeling studies confirm that these compounds block both catalytic and peripheral AChE sites. These results are quite interesting since the triazole-quinoline system is a new structural scaffold for AChE inhibitors. Furthermore, the synthetic approach is very efficient for the preparation of target compounds, allowing a further fruitful new chemical library optimization.
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Affiliation(s)
- Susimaire P Mantoani
- School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto 14040-903, Brazil.
| | - Talita P C Chierrito
- School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto 14040-903, Brazil.
| | - Adriana F L Vilela
- Departamento de Química, Grupo de Cromatografia de Bioafinidade e Produtos Naturais, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto (FFCLRP), Universidade de São Paulo, Ribeirão Preto 14040-901, Brazil.
| | - Carmen L Cardoso
- Departamento de Química, Grupo de Cromatografia de Bioafinidade e Produtos Naturais, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto (FFCLRP), Universidade de São Paulo, Ribeirão Preto 14040-901, Brazil.
| | - Ana Martínez
- Centro de Investigaciones Biológicas (CIB-CSIC), Madrid 28040, Spain.
| | - Ivone Carvalho
- School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto 14040-903, Brazil.
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Zago MCB, Viana GF, Ecker ABS, Nishiyama SAB, Zarpellon MN, Dias JRC, Cardoso CL, Tognim MCB. First report of CTX-M-15-producing Acinetobacter baumannii in Brazil. J Hosp Infect 2015; 92:298-9. [PMID: 26810614 DOI: 10.1016/j.jhin.2015.11.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 11/17/2015] [Indexed: 11/25/2022]
Affiliation(s)
- M C B Zago
- Laboratório de Microbiologia, Departamento de Ciências Básicas da Saúde, Universidade Estadual de Maringá, Maringá, Paraná, Brazil
| | - G F Viana
- Laboratório de Microbiologia, Departamento de Ciências Básicas da Saúde, Universidade Estadual de Maringá, Maringá, Paraná, Brazil
| | - A B S Ecker
- Laboratório de Microbiologia, Departamento de Ciências Básicas da Saúde, Universidade Estadual de Maringá, Maringá, Paraná, Brazil
| | - S A B Nishiyama
- Laboratório de Microbiologia, Departamento de Ciências Básicas da Saúde, Universidade Estadual de Maringá, Maringá, Paraná, Brazil
| | - M N Zarpellon
- Hospital Universitário Regional de Maringá, Maringá, Paraná, Brazil
| | - J R C Dias
- Santa Casa de Misericórdia de Maringá, Maringá, Paraná, Brazil
| | - C L Cardoso
- Laboratório de Microbiologia, Departamento de Ciências Básicas da Saúde, Universidade Estadual de Maringá, Maringá, Paraná, Brazil
| | - M C B Tognim
- Laboratório de Microbiologia, Departamento de Ciências Básicas da Saúde, Universidade Estadual de Maringá, Maringá, Paraná, Brazil.
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Zarpellon MN, Gales AC, Sasaki AL, Selhorst GJ, Menegucci TC, Cardoso CL, Garcia LB, Tognim MCB. Survival of vancomycin-intermediate Staphylococcus aureus on hospital surfaces. J Hosp Infect 2015; 90:347-50. [PMID: 25986166 DOI: 10.1016/j.jhin.2015.04.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [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: 11/29/2014] [Accepted: 04/06/2015] [Indexed: 01/07/2023]
Abstract
BACKGROUND Contaminated surfaces play an important role in the transmission of certain pathogens that are responsible for healthcare-associated infections. Although previous studies have shown that meticillin-resistant Staphylococcus aureus (MRSA) can survive on dry surfaces at room temperature, no published data regarding vancomycin-intermediate S. aureus (VISA) are available to date. AIM To compare the survival time on different types of surfaces, cell-surface hydrophobicity, adherence to abiotic surfaces and biofilm formation of meticillin-susceptible S. aureus (MSSA), MRSA and VISA. METHODS Survival of the S. aureus strains was tested on latex, cotton fabric, vinyl flooring and formica. Cell-surface hydrophobicity was determined using the hydrocarbon interaction affinity method. Adhesion to abiotic surfaces was tested on granite, latex (gloves), glass, vinyl flooring and formica. Biofilm formation was evaluated at 6, 12, 24 and 48 h. FINDINGS All of the samples survived on the vinyl flooring and formica for at least 40 days. VISA survived on both surfaces for more than 45 days. All of the strains were highly hydrophobic. VISA adhered to latex, vinyl flooring and formica. Biofilm formation increased for all of the tested strains within 6-24 h. CONCLUSION VISA present high survival, adherence and cell-surface hydrophobicity. Therefore, as the treatment of patients with VISA is a significant challenge for clinicians, greater care with cleaning and disinfection of different types of surfaces in healthcare facilities is recommended because these may become important reservoirs of multi-resistant pathogens.
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Affiliation(s)
- M N Zarpellon
- Departamento de Ciências Básicas da Saúde, Universidade Estadual de Maringá, PR, Brazil; Hospital Universitário de Maringá, Universidade Estadual de Maringá, PR, Brazil
| | - A C Gales
- Universidade Federal de São Paulo, São Paulo, SP, Brazil
| | - A L Sasaki
- Departamento de Ciências Básicas da Saúde, Universidade Estadual de Maringá, PR, Brazil
| | - G J Selhorst
- Departamento de Ciências Básicas da Saúde, Universidade Estadual de Maringá, PR, Brazil
| | - T C Menegucci
- Departamento de Ciências Básicas da Saúde, Universidade Estadual de Maringá, PR, Brazil
| | - C L Cardoso
- Departamento de Ciências Básicas da Saúde, Universidade Estadual de Maringá, PR, Brazil
| | - L B Garcia
- Departamento de Ciências Básicas da Saúde, Universidade Estadual de Maringá, PR, Brazil
| | - M C B Tognim
- Departamento de Ciências Básicas da Saúde, Universidade Estadual de Maringá, PR, Brazil.
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Vilela AFL, Frugeri BM, Sarria ALF, Kitamura ROS, Fernandes JB, Silva MFGF, Cass QB, Cardoso CL. Aminonaphthoquinone Mannich Bases Derived from Lawsone and Their Copper(II) Complex Derivatives: Synthesis and Potential Cholinesterase Inhibitors as Identified by On-flow Assay. J BRAZIL CHEM SOC 2015. [DOI: 10.5935/0103-5053.20150281] [Citation(s) in RCA: 3] [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: 11/20/2022] Open
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de Moraes MC, Vanzolini KL, Cardoso CL, Cass QB. Corrigendum to “New trends in LC protein ligand screening” [J. Pharmaceut. Biomed. Anal. 87 (2014) 155–156]. J Pharm Biomed Anal 2014. [DOI: 10.1016/j.jpba.2013.12.013] [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: 11/15/2022]
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de Moraes MC, Vanzolini KL, Cardoso CL, Cass QB. New trends in LC protein ligand screening. J Pharm Biomed Anal 2014; 87:155-66. [DOI: 10.1016/j.jpba.2013.07.021] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 07/11/2013] [Accepted: 07/12/2013] [Indexed: 10/26/2022]
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de Moraes MC, Cardoso CL, Cass QB. Immobilized purine nucleoside phosphorylase from Schistosoma mansoni for specific inhibition studies. Anal Bioanal Chem 2013; 405:4871-8. [DOI: 10.1007/s00216-013-6872-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 01/20/2013] [Accepted: 02/25/2013] [Indexed: 11/29/2022]
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Vanzolini KL, Vieira LCC, Corrêa AG, Cardoso CL, Cass QB. Acetylcholinesterase immobilized capillary reactors-tandem mass spectrometry: an on-flow tool for ligand screening. J Med Chem 2013; 56:2038-44. [PMID: 23330848 DOI: 10.1021/jm301732a] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The use of immobilized capillary enzyme reactors (ICERs) for online ligand screening has been adopted as a new technique for high-throughput screening (HTS). In this work, the selected target was the enzyme acetylcholinesterase (AChE), and the AChE-ICERs produced were used in a liquid chromatograph-tandem ion-trap mass spectrometer. The activity and kinetic parameters were evaluated by monitoring the choline's precursor ion (M + H)(+)m/z 104.0 and its ion fragment (C2H3OH) - (M + H)(+)m/z 60.0. The assay method was validated using the reference AChE inhibitors tacrine and galanthamine. Two new ligands, out of a library of 17 coumarin derivatives, were identified, and the half-maximal inhibitory concentration (IC50), inhibition constant (K(i)), and the inhibition mechanism were determined. A coumarin derivative with IC50 similar to tacrine was highlighted.
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Affiliation(s)
- Kenia L Vanzolini
- Departamento de Química, Universidade Federal de São Carlos, CP 676, São Carlos, 13565-905, SP, Brazil
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Cardoso CL, Castro-Gamboa I, Bergamini GM, Cavalheiro AJ, Silva DHS, Lopes MN, Araújo AR, Furlan M, Verli H, Bolzani VDS. An unprecedented neolignan skeleton from Chimarrhis turbinata. J Nat Prod 2011; 74:487-491. [PMID: 21341711 DOI: 10.1021/np1007476] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A lignan with a new skeleton named chimarrhinin (1) was isolated from an extract of the leaves of Chimarrhis turbinata, a Rubiaceae plant species. (13)C NMR spectrometric techniques including 1D and 2D experiments and HRESIMS provided unequivocal structural confirmation of this new C(6).C(3) skeleton type. The relative configuration of 1 was established by 2D (1)H-H analysis and J couplings, while its conformation was evaluated through molecular modeling using the RM1 semiempirical method, with the aid of coupling constants obtained by NMR analysis. The antioxidant activity of the new derivative 1 and two known and previously isolated phenolic derivatives (2 and 3) was investigated. An IC(50) value of 7.50 ± 0.5 μmol L(-1) was obtained for the new derivative 1, while 2 and 3 showed IC(50) values of 18.60 ± 0.4 and 18.50 ± 0.6 μmol, respectively.
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Affiliation(s)
- Carmen L Cardoso
- Departamento de Química, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901, São Paulo, Brazil
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Guido RVC, Cardoso CL, Moraes MCD, Andricopulo AD, Cass QB, Oliva G. Structural insights into the molecular basis responsible for the effects of immobilization on the kinetic parameters of glyceraldehyde-3-phosphate dehydrogenase from Trypanosoma cruzi and human. J BRAZIL CHEM SOC 2010. [DOI: 10.1590/s0103-50532010001000008] [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: 11/22/2022] Open
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Guelfi KC, Tognim MCB, Cardoso CL, Gales AC, Carrara-Marrone FE, Garcia LB. In vitro evaluation of the antimicrobial activity of meropenem in combination with polymyxin B and gatifloxacin against Pseudomonas aeruginosa and Acinetobacter baumannii. J Chemother 2008; 20:180-5. [PMID: 18467243 DOI: 10.1179/joc.2008.20.2.180] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
The antimicrobial activity of meropenem combined with either polymyxin B or gatifloxacin was evaluated by the checkerboard method against Pseudomonas aeruginosa (10 strains) and Acinetobacter baumannii (10 strains). In addition, the triple combination of polymyxin B, gatifloxacin, and meropenem was also studied as well as the polymyxin B and gatifloxacin combination. A partial synergism interaction between meropenem and polymyxin B was observed for 80% of the A. baumannii strains. In contrast, this combination showed an indifferent effect for 80% of the P. aeruginosa strains tested. The combination of meropenem and gatifloxacin showed synergism only for two strains of A. baumannii, and partial synergism and additive effect for seven strains and indifference for four strains of both species. For the strains of P. aeruginosa, the double combination of polymyxin B and gatifloxacin and the triple combination of meropenem, polymyxin B and gatifloxacin were indifferent for the majority of the strains tested, that is, 90 and 80% respectively.
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Affiliation(s)
- K C Guelfi
- Department of Clinical Analyses, Universidade Estadual de Maringá, Maringá, PR, Brazil
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Cardoso CL, Silva DHS, Young MCM, Castro-Gamboa I, Bolzani VDS. Indole monoterpene alkaloids from Chimarrhis turbinata DC Prodr.: a contribution to the chemotaxonomic studies of the Rubiaceae family. Rev bras farmacogn 2008. [DOI: 10.1590/s0102-695x2008000100007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Castro-Gamboa I, Cardoso CL, Silva DHS, Cavalheiro AJ, Furlan M, Bolzani VDS. HPLC-ElCD: an useful tool for the pursuit of novel analytical strategies for the detection of antioxidant secondary metabolites. J BRAZIL CHEM SOC 2003. [DOI: 10.1590/s0103-50532003000500012] [Citation(s) in RCA: 9] [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: 11/21/2022] Open
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Cardoso CL, Giacomelli LR, Helbel C, Sant'Ana JJ, Martins FM, Barreto AM. Survival of tubercle bacilli in heat-fixed and stained sputum smears. Mem Inst Oswaldo Cruz 2001; 96:277-80. [PMID: 11285510 DOI: 10.1590/s0074-02762001000200024] [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: 02/19/2023] Open
Abstract
We used a slide culture technique to detect tubercle bacilli surviving in sputum smears (n=46) after conventional heat fixation and Ziehl-Neelsen staining. In all heat-fixed sputum smears, tubercle bacilli survived after time 0 (n=22), 24 h (n=7), 48 h (n=7), 72 h (n=4), and seven days (n=6). None of the stained sputum smears showed growth on slide cultures. Viable tubercle bacilli remaining in heat-fixed sputum smears for at least seven days may present an infection risk to laboratory staff. Thus, sputum smears should be stained immediately by the Ziehl-Neelsen method or stored in a safe container to avoid transmission of tuberculosis.
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Affiliation(s)
- C L Cardoso
- Laboratório de Microbiologia, Departamento de Análises Clínicas, Universidade Estadual de Maringá, Maringá, PR, 87020-900, Brasil
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Guilhermetti M, Hernandes SE, Fukushigue Y, Garcia LB, Cardoso CL. Effectiveness of hand-cleansing agents for removing methicillin-resistant Staphylococcus aureus from contaminated hands. Infect Control Hosp Epidemiol 2001; 22:105-8. [PMID: 11232870 DOI: 10.1086/501872] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.1] [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: 11/03/2022]
Abstract
OBJECTIVE The effectiveness of hand-cleansing agents in removing a hospital strain of methicillin-resistant Staphylococcus aureus from artificially contaminated hands of five volunteers was studied. DESIGN The products used were plain liquid soap, ethyl alcohol 70% (by weight), 10% povidone-iodine liquid soap (PVP-I), and chlorhexidine gluconate (4%) detergent. The experiments were performed using a Latin square statistical design, with two 5x4 randomized blocks. The removal rates of S aureus cells from contaminated fingertips were estimated by analysis of variance, the response variable being the log10 reduction factor (RF), ie, log10 of the initial counts minus log10 of the final counts. In the first and second blocks, the fingertips of the volunteers were contaminated in mean with 3.76 log10 colony-forming units ([CFU] light-contamination hand) and 6.82 log10 CFU (heavy-contamination hand), respectively. RESULTS In the first block, there were significant differences between treatments (P<.05). The 10% PVP-I (RF, 3.76) and 70% ethyl alcohol (RF, 3.51) had significantly higher removal rates than plain liquid soap (RF, 1.96) and 4% chlorhexidine (RF, 1.91). In the second block, 10% PVP-I (RF, 4.39) and 70% ethyl alcohol (RF, 3.27) also were significantly more effective than plain liquid soap (RF, 1.77) and 4% chlorhexidine (RF, 1.37; P<.05). Plain liquid soap was significantly more effective than chlorhexidine (4%) detergent. CONCLUSIONS The results suggest that 10% PVP-I and 70% ethyl alcohol may be the most effective hand-cleansing agents for removing methicillin-resistant S aureus strain from either lightly or heavily contaminated hands.
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Affiliation(s)
- M Guilhermetti
- Department of Clinical Analyses, State University of Maringá, Paraná, Brazil
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Cardoso CL, Pereira HH, Zequim JC, Guilhermetti M. Effectiveness of hand-cleansing agents for removing Acinetobacter baumannii strain from contaminated hands. Am J Infect Control 1999; 27:327-31. [PMID: 10433671 DOI: 10.1016/s0196-6553(99)70052-0] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.4] [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: 10/25/2022]
Abstract
BACKGROUND The effectiveness of hand-cleansing agents (plain liquid soap, 70% ethyl alcohol, 10% povidone-iodine, and 4% chlorhexidine gluconate) for removing a hospital strain of Acinetobacter baumannii from artificially contaminated hands of 5 volunteers was studied. METHODS The experiments were performed by using a Latin square statistical design, with two 5 x 4 randomized blocks, and the results were estimated by ANOVA. In the first and second blocks, the fingertips of the volunteers were contaminated with approximately 10(3) colony-forming units (light contamination hand) and 10(6) colony-forming units (heavy contamination hand), respectively. RESULTS In the first block, all products tested were effective, almost completely removing the microbial population of A baumannii artificially applied to the hands. In the second block, the use of hand-cleansing agents resulted in 91.36% (4% chlorhexidine), 92.33% (liquid soap), 98.49% (10% povidone-iodine), and 98.93% (70% ethyl alcohol) reduction in counts of A baumannii cells applied to the fingertips. The ethyl alcohol and povidone-iodine had significantly higher removal rates than plain soap and chlorhexidine (P <.05). CONCLUSIONS These results suggest that 70% ethyl alcohol and 10% povidone-iodine may be the most effective hand-cleansing agents for removing A baumannii strain from heavily contaminated hands (10(6) colony-forming units/fingertip).
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Affiliation(s)
- C L Cardoso
- Department of Clinical Analyses, Laboratory of Microbiology, State University of Maringá, Paraná, Brazil
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Abstract
Gutta-percha cones are now widely used to fill root canals. Because they cannot be sterilized by conventional autoclaving or in a hot-air oven, gutta-percha cones require rapid chairside decontamination before use to maintain the aseptic chain, an essential factor in successful endodontic therapy. The purpose of this study was to compare the effectiveness of different concentrations of sodium hypochlorite (0.25% to 4%) in sterilizing gutta-percha cones artificially contaminated with Staphylococcus aureus and Escherichia coli strains, and Bacillus subtilis spores. After 1 min of treatment, the solutions tested showed bactericidal and sporicidal effects at concentrations of 0.25% and 1%, respectively. At a concentration of 0.25%, the solutions tested were effective in destroying spores after 5 min of exposure. Based on this study, treatment of the cones for 1 min with 1% sodium hypochlorite (Milton's solution) or for 5 min with Dakin's liquid (0.5% sodium hypochlorite) is recommended.
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Affiliation(s)
- C L Cardoso
- Department of Clinical Analyses, State University of Maringá, Paraná, Brazil
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Abstract
Five commercially available liquid glutaraldehyde preparations (Glutaron II, Cidex 28, Glutalabor, Banicide, and Anti-G-Plus) were compared for effectiveness in sterilizing gutta-percha cones artificially contaminated with Bacillus subtilis ATCC 6633 spores. Sporicidal activity differed for the various brands of cones, but after 15 min all glutaraldehyde solutions were effective in eliminating the spores. However, three solutions (Cidex 28, Banicide, and Anti-G-Plus) showed sporicidal activity within a shorter time (10 min). All glutaraldehyde solutions tested may be used in endodontic practice for rapid decontamination of gutta-percha cones, thus contributing to the maintenance of the aseptic chain, an essential factor for successful root canal treatment.
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Affiliation(s)
- C L Cardoso
- Department of Clinical Analyses, State University of Maringá, PR, Brazil
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Cardoso CL, Muraro CB, Siqueira VL, Guilhermetti M. Simplified technique for detection of significant bacteriuria by microscopic examination of urine. J Clin Microbiol 1998; 36:820-3. [PMID: 9508322 PMCID: PMC104635 DOI: 10.1128/jcm.36.3.820-823.1998] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [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: 02/06/2023] Open
Abstract
A comparative study of microscopic examination of 10 microl (simplified loop technique) and 50 microl (traditional drop technique) of uncentrifuged Gram-stained urine specimens for detection of significant bacteriuria was carried out. The results demonstrated that the 10-microl loop technique can be used as an alternative to the 50-microl drop technique for presumptive diagnosis of urinary-tract infection in bacteriological practice, with the advantages of greater rapidity and ease of performance.
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Affiliation(s)
- C L Cardoso
- Department of Clinical Analyses, State University of Maringá, Paraná, Brazil.
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Abstract
We evaluated the survival of Pseudomonas aeruginosa, Klebsiella pneumoniae, Serratia marcescens, Escherichia coli, and Staphylococcus aureus, derived from either hospitalized patients or culture collections, on the fingertips of human volunteers. Over 99% of the bacteria died within 2 min of the application, and about 10(5) cells remained on the fingers for up to 90 min.
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