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Hofstra LM, Sauvageot N, Albert J, Alexiev I, Garcia F, Struck D, Van de Vijver DAMC, Åsjö B, Beshkov D, Coughlan S, Descamps D, Griskevicius A, Hamouda O, Horban A, Van Kasteren M, Kolupajeva T, Kostrikis LG, Liitsola K, Linka M, Mor O, Nielsen C, Otelea D, Paraskevis D, Paredes R, Poljak M, Puchhammer-Stöckl E, Sönnerborg A, Staneková D, Stanojevic M, Van Laethem K, Zazzi M, Zidovec Lepej S, Boucher CAB, Schmit JC, Wensing AMJ, Puchhammer-Stockl E, Sarcletti M, Schmied B, Geit M, Balluch G, Vandamme AM, Vercauteren J, Derdelinckx I, Sasse A, Bogaert M, Ceunen H, De Roo A, De Wit S, Echahidi F, Fransen K, Goffard JC, Goubau P, Goudeseune E, Yombi JC, Lacor P, Liesnard C, Moutschen M, Pierard D, Rens R, Schrooten Y, Vaira D, Vandekerckhove LPR, Van den Heuvel A, Van Der Gucht B, Van Ranst M, Van Wijngaerden E, Vandercam B, Vekemans M, Verhofstede C, Clumeck N, Van Laethem K, Beshkov D, Alexiev I, Lepej SZ, Begovac J, Kostrikis L, Demetriades I, Kousiappa I, Demetriou V, Hezka J, Linka M, Maly M, Machala L, Nielsen C, Jørgensen LB, Gerstoft J, Mathiesen L, Pedersen C, Nielsen H, Laursen A, Kvinesdal B, Liitsola K, Ristola M, Suni J, Sutinen J, Descamps D, Assoumou L, Castor G, Grude M, Flandre P, Storto A, Hamouda O, Kücherer C, Berg T, Braun P, Poggensee G, Däumer M, Eberle J, Heiken H, Kaiser R, Knechten H, Korn K, Müller H, Neifer S, Schmidt B, Walter H, Gunsenheimer-Bartmeyer B, Harrer T, Paraskevis D, Hatzakis A, Zavitsanou A, Vassilakis A, Lazanas M, Chini M, Lioni A, Sakka V, Kourkounti S, Paparizos V, Antoniadou A, Papadopoulos A, Poulakou G, Katsarolis I, Protopapas K, Chryssos G, Drimis S, Gargalianos P, Xylomenos G, Lourida G, Psichogiou M, Daikos GL, Sipsas NV, Kontos A, Gamaletsou MN, Koratzanis G, Sambatakou H, Mariolis H, Skoutelis A, Papastamopoulos V, Georgiou O, Panagopoulos P, Maltezos E, Coughlan S, De Gascun C, Byrne C, Duffy M, Bergin C, Reidy D, Farrell G, Lambert J, O'Connor E, Rochford A, Low J, Coakely P, O'Dea S, Hall W, Mor O, Levi I, Chemtob D, Grossman Z, Zazzi M, de Luca A, Balotta C, Riva C, Mussini C, Caramma I, Capetti A, Colombo MC, Rossi C, Prati F, Tramuto F, Vitale F, Ciccozzi M, Angarano G, Rezza G, Kolupajeva T, Vasins O, Griskevicius A, Lipnickiene V, Schmit JC, Struck D, Sauvageot N, Hemmer R, Arendt V, Michaux C, Staub T, Sequin-Devaux C, Wensing AMJ, Boucher CAB, van de Vijver DAMC, van Kessel A, van Bentum PHM, Brinkman K, Connell BJ, van der Ende ME, Hoepelman IM, van Kasteren M, Kuipers M, Langebeek N, Richter C, Santegoets RMWJ, Schrijnders-Gudde L, Schuurman R, van de Ven BJM, Åsjö B, Kran AMB, Ormaasen V, Aavitsland P, Horban A, Stanczak JJ, Stanczak GP, Firlag-Burkacka E, Wiercinska-Drapalo A, Jablonowska E, Maolepsza E, Leszczyszyn-Pynka M, Szata W, Camacho R, Palma C, Borges F, Paixão T, Duque V, Araújo F, Otelea D, Paraschiv S, Tudor AM, Cernat R, Chiriac C, Dumitrescu F, Prisecariu LJ, Stanojevic M, Jevtovic D, Salemovic D, Stanekova D, Habekova M, Chabadová Z, Drobkova T, Bukovinova P, Shunnar A, Truska P, Poljak M, Lunar M, Babic D, Tomazic J, Vidmar L, Vovko T, Karner P, Garcia F, Paredes R, Monge S, Moreno S, Del Amo J, Asensi V, Sirvent JL, de Mendoza C, Delgado R, Gutiérrez F, Berenguer J, Garcia-Bujalance S, Stella N, de Los Santos I, Blanco JR, Dalmau D, Rivero M, Segura F, Elías MJP, Alvarez M, Chueca N, Rodríguez-Martín C, Vidal C, Palomares JC, Viciana I, Viciana P, Cordoba J, Aguilera A, Domingo P, Galindo MJ, Miralles C, Del Pozo MA, Ribera E, Iribarren JA, Ruiz L, de la Torre J, Vidal F, Clotet B, Albert J, Heidarian A, Aperia-Peipke K, Axelsson M, Mild M, Karlsson A, Sönnerborg A, Thalme A, Navér L, Bratt G, Karlsson A, Blaxhult A, Gisslén M, Svennerholm B, Bergbrant I, Björkman P, Säll C, Mellgren Å, Lindholm A, Kuylenstierna N, Montelius R, Azimi F, Johansson B, Carlsson M, Johansson E, Ljungberg B, Ekvall H, Strand A, Mäkitalo S, Öberg S, Holmblad P, Höfer M, Holmberg H, Josefson P, Ryding U. Transmission of HIV Drug Resistance and the Predicted Effect on Current First-line Regimens in Europe. Clin Infect Dis 2015; 62:655-663. [PMID: 26620652 PMCID: PMC4741360 DOI: 10.1093/cid/civ963] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [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: 06/08/2015] [Accepted: 11/06/2015] [Indexed: 11/13/2022] Open
Abstract
Transmitted human immunodeficiency virus drug resistance in Europe is stable at around 8%. The impact of baseline mutation patterns on susceptibility to antiretroviral drugs should be addressed using clinical guidelines. The impact on baseline susceptibility is largest for nonnucleoside reverse transcriptase inhibitors. Background. Numerous studies have shown that baseline drug resistance patterns may influence the outcome of antiretroviral therapy. Therefore, guidelines recommend drug resistance testing to guide the choice of initial regimen. In addition to optimizing individual patient management, these baseline resistance data enable transmitted drug resistance (TDR) to be surveyed for public health purposes. The SPREAD program systematically collects data to gain insight into TDR occurring in Europe since 2001. Methods. Demographic, clinical, and virological data from 4140 antiretroviral-naive human immunodeficiency virus (HIV)–infected individuals from 26 countries who were newly diagnosed between 2008 and 2010 were analyzed. Evidence of TDR was defined using the WHO list for surveillance of drug resistance mutations. Prevalence of TDR was assessed over time by comparing the results to SPREAD data from 2002 to 2007. Baseline susceptibility to antiretroviral drugs was predicted using the Stanford HIVdb program version 7.0. Results. The overall prevalence of TDR did not change significantly over time and was 8.3% (95% confidence interval, 7.2%–9.5%) in 2008–2010. The most frequent indicators of TDR were nucleoside reverse transcriptase inhibitor (NRTI) mutations (4.5%), followed by nonnucleoside reverse transcriptase inhibitor (NNRTI) mutations (2.9%) and protease inhibitor mutations (2.0%). Baseline mutations were most predictive of reduced susceptibility to initial NNRTI-based regimens: 4.5% and 6.5% of patient isolates were predicted to have resistance to regimens containing efavirenz or rilpivirine, respectively, independent of current NRTI backbones. Conclusions. Although TDR was highest for NRTIs, the impact of baseline drug resistance patterns on susceptibility was largest for NNRTIs. The prevalence of TDR assessed by epidemiological surveys does not clearly indicate to what degree susceptibility to different drug classes is affected.
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Affiliation(s)
- L Marije Hofstra
- Luxembourg Institute of Health, Luxembourg.,Department of Virology, University Medical Center Utrecht, The Netherlands
| | | | - Jan Albert
- Karolinska Institute, Solna.,Karolinska University Hospital, Stockholm, Sweden
| | - Ivailo Alexiev
- National Center of Infectious and Parasitic Diseases, Sofia, Bulgaria
| | - Federico Garcia
- Complejo Hospitalario Universitario de Granada, Instituto de Investigación IBS Granada; on behalf of Cohorte de Adultos de la Red de Investigación en SIDA, Spain
| | | | | | | | - Danail Beshkov
- National Center of Infectious and Parasitic Diseases, Sofia, Bulgaria
| | | | - Diane Descamps
- AP-HP Groupe hospitalier Bichat-Claude Bernard, IAME INSERM UMR 1137, Université Paris Diderot Sorbonne Paris Cité, Paris, France
| | | | | | | | | | | | | | - Kirsi Liitsola
- Department of Infectious Diseases, National Institute for Health and Welfare, Helsinki, Finland
| | - Marek Linka
- National Reference Laboratory for HIV/AIDS, National Institute of Public Health, Prague, Czech Republic
| | - Orna Mor
- National HIV Reference Laboratory, Chaim Sheba Medical Center, Tel-Hashomer, Israel
| | | | - Dan Otelea
- National Institute for Infectious Diseases "Prof. dr. Matei Bals", Bucharest, Romania
| | | | | | - Mario Poljak
- Faculty of Medicine, Slovenian HIV/AIDS Reference Centre, University of Ljubljana, Slovenia
| | | | - Anders Sönnerborg
- Karolinska Institute, Solna.,Karolinska University Hospital, Stockholm, Sweden
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Swartz JE, Vandekerckhove L, Ammerlaan H, de Vries AC, Begovac J, Bierman WFW, Boucher CAB, van der Ende ME, Grossman Z, Kaiser R, Levy I, Mudrikova T, Paredes R, Perez-Bercoff D, Pronk M, Richter C, Schmit JC, Vercauteren J, Zazzi M, Židovec Lepej S, De Luca A, Wensing AMJ. Efficacy of tenofovir and efavirenz in combination with lamivudine or emtricitabine in antiretroviral-naive patients in Europe. J Antimicrob Chemother 2015; 70:1850-7. [PMID: 25740950 DOI: 10.1093/jac/dkv033] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [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: 09/30/2014] [Accepted: 01/25/2015] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND The combination of tenofovir and efavirenz with either lamivudine or emtricitabine (TELE) has proved to be highly effective in clinical trials for first-line treatment of HIV-1 infection. However, limited data are available on its efficacy in routine clinical practice. METHODS A multicentre cohort study was performed in therapy-naive patients initiating ART with TELE before July 2009. Efficacy was studied using ITT (missing or switch = failure) and on-treatment (OT) analyses. Genotypic susceptibility scores (GSSs) were determined using the Stanford HIVdb algorithm. RESULTS Efficacy analysis of 1608 patients showed virological suppression to <50 copies/mL at 48 weeks in 91.5% (OT) and 70.6% (ITT). Almost a quarter of all patients (22.9%) had discontinued TELE at week 48, mainly due to CNS toxicity. Virological failure within 48 weeks was rarely observed (3.3%, n = 53). In multilevel, multivariate analysis, infection with subtype B (P = 0.011), baseline CD4 count <200 cells/mm³ (P < 0.001), GSS <3 (P = 0.002) and use of lamivudine (P < 0.001) were associated with a higher risk of virological failure. After exclusion of patients using co-formulated compounds, virological failure was still more often observed with lamivudine. Following virological failure, three-quarters of patients switched to a PI-based regimen with GSS <3. After 1 year of second-line therapy, viral load was suppressed to <50 copies/mL in 73.5% (OT). CONCLUSIONS In clinical practice, treatment failure on TELE regimens is relatively frequent due to toxicity. Virological failure is rare and more often observed with lamivudine than with emtricitabine. Following virological failure on TELE, PI-based second-line therapy was often successful despite GSS <3.
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Affiliation(s)
- J E Swartz
- Department of Medical Microbiology, Virology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - L Vandekerckhove
- Department of General Internal Medicine, Ghent University, Ghent, Belgium
| | - H Ammerlaan
- Department of Internal Medicine, Catharina Ziekenhuis, Eindhoven, The Netherlands
| | - A C de Vries
- Department of Medical Microbiology, Virology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - J Begovac
- Department of Infectious Diseases, University Hospital for Infectious Diseases, Zagreb, Croatia
| | - W F W Bierman
- Department of Internal Medicine, University Medical Centre Groningen, Groningen, The Netherlands
| | - C A B Boucher
- Department of Virology, Erasmus MC, Rotterdam, The Netherlands
| | - M E van der Ende
- Department of Internal Medicine, Erasmus MC, Rotterdam, The Netherlands
| | - Z Grossman
- School of Public Health, Tel-Aviv University, Tel-Aviv, Israel
| | - R Kaiser
- Institute of Virology, University of Cologne, Cologne, Germany
| | - I Levy
- School of Public Health, Tel-Aviv University, Tel-Aviv, Israel
| | - T Mudrikova
- Department of Infectious Diseases, UMC Utrecht, Utrecht, The Netherlands
| | - R Paredes
- IrsiCaixa AIDS Research Institute, Hospital Universitari Germans Trias i Pujol, Badalona, Spain
| | - D Perez-Bercoff
- Laboratory of Retrovirology, CRP Santé, Luxembourg, Luxembourg
| | - M Pronk
- Department of Internal Medicine, Catharina Ziekenhuis, Eindhoven, The Netherlands
| | - C Richter
- Department of Infectious Diseases, Rijnstate Hospital, Arnhem, The Netherlands
| | - J C Schmit
- Laboratory of Retrovirology, CRP Santé, Luxembourg, Luxembourg Department of Infectious Diseases, Centre Hospitalier de Luxembourg, Strassen, Luxembourg
| | - J Vercauteren
- Rega Institute for Medical Research, KU Leuven, Leuven, Belgium
| | - M Zazzi
- Department of Medical Biotechnologies, University of Siena, Siena, Italy
| | - S Židovec Lepej
- Department of Infectious Diseases, University Hospital for Infectious Diseases, Zagreb, Croatia
| | - A De Luca
- Department of Infectious Diseases, Catholic University, Rome, Italy Infectious Diseases Unit, University Hospital of Siena, Siena, Italy
| | - A M J Wensing
- Department of Medical Microbiology, Virology, University Medical Center Utrecht, Utrecht, The Netherlands
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Matthijnssens J, Zeller M, Heylen E, De Coster S, Vercauteren J, Braeckman T, Van Herck K, Meyer N, PirÇon JY, Soriano-Gabarro M, Azou M, Capiau H, De Koster J, Maernoudt AS, Raes M, Verdonck L, Verghote M, Vergison A, Van Damme P, Van Ranst M. Higher proportion of G2P[4] rotaviruses in vaccinated hospitalized cases compared with unvaccinated hospitalized cases, despite high vaccine effectiveness against heterotypic G2P[4] rotaviruses. Clin Microbiol Infect 2014; 20:O702-10. [DOI: 10.1111/1469-0691.12612] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 02/16/2014] [Accepted: 02/25/2014] [Indexed: 12/26/2022]
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Theys K, Snoeck J, Vercauteren J, Abecasis AB, Vandamme AM, Camacho RJ. Decreasing population selection rates of resistance mutation K65R over time in HIV-1 patients receiving combination therapy including tenofovir. J Antimicrob Chemother 2012; 68:419-23. [PMID: 23027713 DOI: 10.1093/jac/dks380] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES The use of tenofovir is highly associated with the emergence of mutation K65R, which confers broad resistance to nucleoside/nucleotide analogue reverse transcriptase inhibitors (NRTIs), especially when tenofovir is combined with other NRTIs also selecting for K65R. Although recent HIV-1 treatment guidelines discouraging these combinations resulted in reduced K65R selection with tenofovir, updated information on the impact of currently recommended regimens on the population selection rate of K65R is presently lacking. METHODS In this study, we evaluated changes over time in the selection rate of resistance mutation K65R in a large population of 2736 HIV-1-infected patients failing combination antiretroviral treatment between 2002 and 2010. RESULTS The K65R resistance mutation was detected in 144 patients, a prevalence of 5.3%. A large majority of observed K65R cases were explained by the use of tenofovir, reflecting its wide use in clinical practice. However, changing patterns over time in NRTIs accompanying tenofovir resulted in a persistent decreasing probability of K65R selection by tenofovir-based therapy. The currently recommended NRTI combination tenofovir/emtricitabine was associated with a low probability of K65R emergence. For any given dual NRTI combination including tenofovir, higher selection rates of K65R were consistently observed with a non-nucleoside reverse transcriptase inhibitor than with a protease inhibitor as the third agent. DISCUSSION Our finding of a stable time trend of K65R despite elevated use of tenofovir illustrates increased potency of current HIV-1 therapy including tenofovir.
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Affiliation(s)
- K Theys
- Rega Institute for Medical Research, KU Leuven, Leuven, Belgium.
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van de Vijver DAMC, Wensing AMJ, Åsjö B, Bruckova M, Jorgensen LB, Camacho R, Horban A, Linka M, Lazanas M, Loveday C, MacRae E, Nielsen C, Paraskevis D, Poljak M, Puchhammer-Stöckl E, Ruiz L, Schmit JC, Stanczak G, Stanojevic M, Vandamme AM, Vercauteren J, Zazzi M, Bacheler L, Lecocq P, Villacian J, Boucher CAB. HIV-1 drug-resistance patterns among patients on failing treatment in a large number of European countries. Acta Dermatovenerol Alp Pannonica Adriat 2010; 19:3-9. [PMID: 21390473] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
BACKGROUND Information about patterns of HIV-1 drug resistance among treatment-exposed patients is crucial for the development of novel effective drugs. Currently no system exists that monitors patterns of resistance in patients failing therapy. METHODS The study included 1,988 HIV-1 sequences from patients experiencing therapy failure collected between 2000 and 2004 in 15 European countries. Genotypic resistance was interpreted using the ANRS algorithm. Phenotypic resistance was predicted using the Virco geno- to phenotype system. RESULTS 80.7% of the sequences included at least one drug-resistance mutation. Mutations were found for NRTIs (73.5%), NNRTIs (48.5%), and protease inhibitors (35.8%). Ninety percent of sequences with genotypic resistance harbored M184V, M41L, K103N, D67N, and/or T215Y. Among NRTIs, resistance was most frequently predicted for lamivudine. About half of all sequences had reduced susceptibility for NNRTIs. Resistance to most boosted protease inhibitors was found in < 25%. No sequence had resistance to all currently available drugs. CONCLUSION Levels of resistance among patients with therapy failure were high. The patterns of resistance reflect resistance to drugs available for a longer time. Fully suppressive regimens can be designed even for the most mutated HIV because boosted protease inhibitors have remained active against most circulating viruses and new drug classes have become available.
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Affiliation(s)
- D A M C van de Vijver
- Dept. of Virology, Erasmus MC, Rotterdam University Medical Centre, Rotterdam, the Netherlands.
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Vercauteren J, Maringwa J, Coens C, Quinten C, Gotay C, Ringash J, King M, Osoba D, Flechtner H, Bottomley A. The association between clinical, sociodemographic, and logistic-administrative factors and adherence to completing health-related quality-of-life questionnaires. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.9075] [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: 11/20/2022] Open
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Quinten C, Martinelli F, Vercauteren J, Greimel E, Reeve BB, Taphoorn MJ, Cleeland CS, Weis J, Schmucker-Von Koch J, Bottomley A. Use of health-related quality of life and clinical data as prognostic tools for survival prediction in a subgroup of metastatic cancer patients. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.9146] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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Carbonell S, Hey M, Mitchell J, Roberts C, Hipkiss J, Vercauteren J. Capillary Flow and Rheology Measurements on Chocolate Crumb/Sunflower Oil Mixtures. J Food Sci 2006. [DOI: 10.1111/j.1365-2621.2004.tb09931.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Barbaste M, Berké B, Dumas M, Soulet S, Delaunay JC, Castagnino C, Arnaudinaud V, Chèze C, Vercauteren J. Dietary antioxidants, peroxidation and cardiovascular risks. J Nutr Health Aging 2002; 6:209-23. [PMID: 11887247] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Most of the many epidemiological studies in the field strongly suggest that an equilibrated diet such as the so-called "mediterranean diet", is associated with protective effects against major diseases, and particularly, against cardiovascular risks. Since many reports also consider reactive oxygen species or free radical oxidations to be responsible for the accompanying disorders of most pathologies as well as for ageing, it is conceivable that natural plant metabolites such as polyphenols, are likely to play an important role in insuring this protection. Indeed, not only their presence, in particularly high amounts and varieties in foods of such a diet, but also, inter alia, their very potent antioxidant or radical scavenging properties, make polyphenols best accounting for the parodoxical part of the french paradox . Therefore, many efforts have been made to assess the mechanisms for such a cardiovascular disease protection. Whatever convincing were the polyphenols properties demonstrated by many in vitro experiments to support those theories, quite a great number of the results appeared somewhat contradictory when transposed to humans, in the in vivo situation. Some people totally refute this explanation, thinking that health benefits, as far as alcoholic beverages are concerned, originate from ethanol but also, with no doubt, some polyphenols even revealing to be pro-oxidants .
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Affiliation(s)
- M Barbaste
- EA 491, Laboratoire de Pharmacognosie, Faculté de Pharmacie, Université Victor Segalen Bordeaux, France
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Vitrac X, Castagnino C, Waffo-Téguo P, Delaunay JC, Vercauteren J, Monti JP, Deffieux G, Mérillon JM. Polyphenols newly extracted in red wine from southwestern France by centrifugal partition chromatography. J Agric Food Chem 2001; 49:5934-8. [PMID: 11743788 DOI: 10.1021/jf010522d] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Polyphenols from the ethyl acetate extracts of red wine were successfully fractionated using a four-step process (solvent extraction, ion-exchange column chromatography, centrifugal partition chromatography, and semipreparative HPLC), which resulted in the isolation of 22 compounds belonging to different classes of polyphenols (stilbenes, cinnamic acids, flavonoids). Five of them are red wine constituents reported for the first time. The newly isolated compounds include resveratrol dimers, dihydroflavonols, and a cinnamic derivative.
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Affiliation(s)
- X Vitrac
- Groupe d'Etude des Substances Naturelles à Intérêt Thérapeutique EA491, Université de Bordeaux 2, Faculté des Sciences Pharmaceutiques, 3, Place de la Victoire, 33076 Bordeaux Cédex, France
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Abstract
Several anthocyanin-derived pigments that showed UV-visible spectra different from those of the original grape anthocyanins were detected by HPLC-DAD analysis in 1-year-old bottled Port wines from the Douro region. Among these, three malvidin 3-glucoside derived pigments were detected in large amounts, representing approximately 60% of the total anthocyanidin monoglucosides content. These pigments were isolated, purified, and identified by LSI-MS and NMR ((1)H, DQF-COSY, ROESY, HSQC, and HMBC) techniques. The major pigment is malvidin 3-glucoside pyruvic adduct, previously characterized, and the other two corresponded to its respective acetyl and coumaroyl glucoside derivatives. The latter is reported for the first time in red wines.
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Affiliation(s)
- N Mateus
- Centro de Investigação em Química, Departamento de Química do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal
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Vercauteren J, Pérès C, Devos C, Sandra P, Vanhaecke F, Moens L. Stir bar sorptive extraction for the determination of ppq-level traces of organotin compounds in environmental samples with thermal desorption-capillary gas chromatography--ICP mass spectrometry. Anal Chem 2001; 73:1509-14. [PMID: 11321302 DOI: 10.1021/ac000714s] [Citation(s) in RCA: 132] [Impact Index Per Article: 5.7] [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: 11/28/2022]
Abstract
The extraction and preconcentration capabilities of a new extraction technique, stir bar sorptive extraction, were combined with the separation power of capillary gas chromatography (CGC) and the low limits of detection (LODs) of inductively coupled plasma mass spectrometry (ICPMS) for the determination of the organotin compounds tributyltin (TBuT) and triphenyltin (TPhT) in aqueous standard solutions, harbor water, and mussels (after digestion with tetramethylammonium hydroxide). Throughout, tripropyltin for TBuT and tricyclohexyltin for TPhT were used as internal standards to correct for variations in the derivatization and extraction efficiency. Calibration was accomplished by means of single standard addition. Derivatization to transform the trisubstituted compounds into sufficiently volatile compounds was carried out with sodium tetraethylborate. The compounds were extracted from their aqueous matrix using a stir bar of 1-cm length, coated with 55 microL of poly(dimethylsiloxane) (PDMS). After 15 min of extraction, the stir bar was desorbed in a thermal desorption unit at 290 degrees C for 15 min, during which the compounds were cold-trapped on a precolumn at -40 degrees C. Flash heating was used to rapidly transfer the compounds to the GC where they were separated on a capillary column with a PDMS coating. After separation, the compounds were transported to the ICP by means of a homemade heated (270 degrees C) transfer line. Monitoring of the 120Sn+ signal by ICPMS during the run of the GC provided extremely low LODs for TPhT in water: 0.1 pg L(-1) (procedure) and 10 fg L(-1) (instrumental) and a repeatability of 12% RSD (n = 10). In harbor water, concentrations of 200 pg L(-1) for TBuT and 22 pg L(-1) for TPhT were found. In fresh mussels, a concentration of 7.2 ng g(-1) (dry weight) TPhT was found. The accuracy of the method was checked by the determination of TPhT in CRM477 (mussel tissue) and comparison of the result to that of an analysis of the same material with a classical liquid/liquid extraction with isooctane.
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Affiliation(s)
- J Vercauteren
- Laboratory of Analytical Chemistry, Ghent University, Belgium.
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15
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Abstract
Epidemiological studies have shown that the incidence of some cardiovascular degenerative diseases appears to be lower in populations with regular but moderate drinking of red wine rich in polyphenols. One of the most important properties of polyphenols is to form complexes with proteins. The linear nonapeptide hormone bradykinin (H-Arg1-Pro2-Pro3-Gly4-Phe5-Ser6-Pro7-Phe8-Arg9-OH) is involved in a variety of physiological processes such as the cardiovascular processes. Thus, the goal of this work was to study the effects of tannins on the peptide structure by NMR investigations and molecular modeling. The results of these investigations show that in the presence of catechin, the peptide conformation is not affected and is in a random coil structure. On the contrary, the peptide structure is modified by the addition of dimeric proanthocyanidin B3 (catechin 4alpha-->8 catechin). The dimer leads to the formation of a large flexible turn between the 6-9 residues. Thus, the biological activities of bradykinin in the presence of polyphenols could be affected.
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Affiliation(s)
- T Richard
- GESNIT EA 491, Faculté des Sciences Pharmaceutiques, Université de Bordeaux 2, France
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16
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Mas T, Susperregui J, Berké B, Chèze C, Moreau S, Nuhrich A, Vercauteren J. DNA triplex stabilization property of natural anthocyanins. Phytochemistry 2000; 53:679-687. [PMID: 10746881 DOI: 10.1016/s0031-9422(99)00619-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The DNA triplex stabilization property of seven natural anthocyanins (five monoglucosides and two diglucosides) has been measured by the mean of triplex thermal denaturation experiments. We have noticed a difference between the diglucosides that do not modify this melting temperature and the monoglucosides (namely 3-O-beta-D-glucopyranoside of malvidin, peonidin, delphinidin, petunidin and cyanidin) which present a weak but significant stabilizing effect. It appears clearly that the difference between the two series could be due to the supplementary sugar moiety at the 5 position for the diglucosylated compounds, that would make them too crowded to allow interaction with the triplex. Among the monoglucoside series, the most active compounds are the only ones to embody a catechol B-ring in their structure that could be important for such an interaction. The need to have pure and fully characterized compounds to run these measurements, made it possible for us to unambiguously assign the 1H and 13C NMR spectra with the help of 2D NMR experiments. Thus, missing data of compounds not totally described earlier, are provided herein.
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Affiliation(s)
- T Mas
- Laboratoire de Pharmacognosie, Université Victor Segalen Bordeaux, France
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17
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Ribeiro de Lima MT, Waffo-Téguo P, Teissedre PL, Pujolas A, Vercauteren J, Cabanis JC, Mérillon JM. Determination of stilbenes (trans-astringin, cis- and trans-piceid, and cis- and trans-resveratrol) in Portuguese wines. J Agric Food Chem 1999; 47:2666-2670. [PMID: 10552542 DOI: 10.1021/jf9900884] [Citation(s) in RCA: 106] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Stilbenes have been shown to have cancer chemopreventive activity and to protect lipoproteins from oxidative damage. A method is described for their direct determination in different types of wine using high-performance liquid chromatography with ultraviolet detection. In a survey of 120 commercial wines from Portugal and France, the highest concentrations of stilbenes were found in red wines. The glucosides of resveratrol were present in higher concentrations than the free isomers. Isolation from wine and characterization of trans-astringin in a large quantity are described for the first time.
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Affiliation(s)
- M T Ribeiro de Lima
- Faculté des Sciences Pharmaceutiques, Centre de Formation et de Recherche en OEnologie, Université de Montpellier I, Avenue Charles Flahault, 34060 Montpellier Cedex 2, France
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18
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Krisa S, Téguo PW, Decendit A, Deffieux G, Vercauteren J, Mérillon JM. Production of 13C-labelled anthocyanins by Vitis vinifera cell suspension cultures. Phytochemistry 1999; 51:651-656. [PMID: 10392469 DOI: 10.1016/s0031-9422(99)00068-0] [Citation(s) in RCA: 18] [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: 05/23/2023]
Abstract
The use of plant cell cultures for producing isotopically (13C) labelled phenolic substances is reported. Vitis vinifera cells synthesize high levels of anthocyanins when they are cultured in a polyphenol synthesis-inducing medium. Three major anthocyanin monoglucosides found in red wine were identified in grape cells: cyanidin-3-O-beta-glucoside, peonidin-3-O-beta-glucoside, and malvidin-3-O-beta-glucoside. Kinetic study of the intracellular level of phenylalanine and its metabolites showed that it is preferable to add this precursor to grape cell suspensions after the 5th day of culture, i.e. at the beginning of the exponential growth phase. After adding phenylalanine to the culture medium, its uptake was complete and the accumulation of anthocyanins in grape cells was stimulated. Incorporation of [1-13C]-phenylalanine into anthocyanins was measured by means of 13C satellites in the proton NMR spectrum. The maximal rate of 13C enrichment anthocyanins obtained with this technique reached 65%. The production of 13C labelled phenolic compounds was undertaken in order to investigate their absorption and metabolism in humans.
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Affiliation(s)
- S Krisa
- Groupe d'Etude des Substances Naturelles à Intérêt Thérapeutique, Faculté de Pharmacie, Université de Bordeaux II, France
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19
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Verstraete D, Riondato J, Vercauteren J, Vanhaecke F, Moens L, Dams R, Verloo M. Determination of the uptake of [Pt(NH3)4](NO3)2 by grass cultivated on a sandy loam soil and by cucumber plants, grown hydroponically. Sci Total Environ 1998; 218:153-160. [PMID: 9753790 DOI: 10.1016/s0048-9697(98)00204-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Two cultivation experiments were carried out in order to answer the question to what extent platinum can enter the food chain by accumulation in plants, when the platinum is present in a bio-available form: (i) cucumber plants (Cucumis sativus) were grown hydroponically in nutrient solutions containing [Pt(NH3)4](NO3)2 (from 0.5 to 50 micrograms Pt/l solution); and (ii) a water-soluble platinum compound--[Pt(NH3)4](NO3)2--was added in increasing amounts to a sandy loam soil (from 0.5 to 50 mg Pt/kg soil) and rye grass (Lolium perenne) was grown on it. The roots on the one hand and the green plant fractions in the other hand of the cucumber plants and the rye grass were digested using a high-pressure asher. The platinum concentration was determined by means of a quadrupole-based (VG PQ I) or a double focusing sector field ICP-mass spectrometer (Finnigan MAT, Element), depending on the platinum concentration in the sample solution. The detection limit for platinum obtained with the VG PQ I was observed to be 6 ng/1, while with the 'Element' the detection limit could be improved to 0.5 ng/1 Pt. Accumulation factors were calculated as the ratio of the platinum concentration in the plant to that in the soil or the nutrient solution. The grass grown on spiked soil accumulated platinum only to a slight degree (accumulation factors between 0.008 and 0.032). The hydroponically grown cucumber plants, however, strongly accumulated it (accumulation factors of 11-42 in the shoot and 1700-2100 in the roots). There are three possible causes for the large differences in the accumulation factors: (i) Cucumber plants are dicotyledons; grass, however, is a monocotyledon. Other cultivation experiments already showed that dicotyledons accumulate metals to a higher extent than monocotyledons. (ii) In the grass cultivation experiment, the platinum compound was only added once to the sandy loam soil, namely 2 days before grass was cultivated on it. The nutrient solutions of the cucumber plants were changed twice a week. Consequently, the total amount of platinum that the plants were exposed to during the cultivation of the cucumber plants was higher than during the cultivation of the grass. (iii) Immobilization of the platinum compound in the soil most likely occurred.
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Affiliation(s)
- D Verstraete
- Laboratory of Analytical Chemistry, Ghent University, Belgium
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20
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Fauconneau B, Deffieux G, Huguet F, Vercauteren J, Merillon JM. Isolation, identification, and antioxidant activity of three stilbene glucosides newly extracted from vitis vinifera cell cultures. J Nat Prod 1998; 61:655-657. [PMID: 9599270 DOI: 10.1021/np9704819] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Suspension cultures of Vitis vinifera L. (Vitaceae) produce many hydroxylated stilbene glucosides found in red wine. From these cells, we isolated and characterized glycosylated stilbenes, (Z)-piceatannol (3,5,3',4'-tetrahydroxystilbene) -3-O-beta-d-glucopyranoside (6) and (E)- and (Z)-resveratrol (3,5, 4'-trihydroxystilbene)-4'-O-beta-d-glucopyranoside (2 and 7, respectively), which have not previously reported to be constituents of Vitis vinifera or wine. The ability of these compounds to act as radical scavengers was investigated using 1,1 diphenyl-2-picryl-hydrazyl, a stable free radical. Antioxidant activities were assessed by their capacity to prevent Cu2+-induced lipid peroxidation in human low-density lipoprotein.
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21
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Mérillon JM, Fauconneau B, Teguo PW, Barrier L, Vercauteren J, Huguet F. Antioxidant activity of the stilbene astringin, newly extracted from Vitis vinifera cell cultures. Clin Chem 1997; 43:1092-3. [PMID: 9191572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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22
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Michel J, Toulmé JJ, Vercauteren J, Moreau S. Quinazoline-2,4(1H,3H)-dione as a substitute for thymine in triple-helix forming oligonucleotides: a reassessment. Nucleic Acids Res 1996; 24:1127-35. [PMID: 8604348 PMCID: PMC145745 DOI: 10.1093/nar/24.6.1127] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [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: 01/31/2023] Open
Abstract
A major limitation in triple-helix formation arises from the weak energy of interaction between the third strand and the double-stranded target. We tried to increase the stacking interaction contribution within the third strand by extending the aromatic domain of thymine. We report here the use of 2,4-quinazolinedione as a substitute for thymine in the canonical TA*T triplet. The synthesis and the characterization of the quinazoline beta nucleoside Q and of its phosphoramidite derivative is described. Triple-helix- forming oligonucleotides incorporating Q have been prepared and their ability to form triplexes has been evaluated by UV-monitored thermal denaturation measurements. The introduction of one or multiple Q residues, either contiguous or remote from each other, slightly destabilized triple-stranded structures, whatever the nucleic acid base composition (pyrimidine or GT) of the third strand.
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Affiliation(s)
- J Michel
- INSERM U-386, Laboratoire de Biophysique Moléculaire, Université de Bordeaux, France
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23
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Abstract
Juniperoside, a new 9-O[beta- D-glucopyranoside]-3,4,5-trimethoxycinnamyl alcohol has been isolated along with the 9- O-[alpha-L-arabinofuranosyl-(1-->6)-beta- D-glucopyranoside]cinnamyl alcohol (rosarin) and coumarin 7- O-beta- D-glucopyranoside (skimmin) from the acetone extract of the aerial parts of Juniperus phoenicea L. The structure elucidation of these natural products was achieved mainly by mass and NMR spectroscopy.
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Affiliation(s)
- G Comte
- Laboratoire de Pharmacognosie et de Phytochimie, UFR de Pharmacie, Université de Limoges, 2 rue Docteur Marcland, F-87025 Limoges Cedex, France
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24
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Nuhrich A, Varache-Lembège M, Vercauteren J, Dokhan R, Renard P, Devaux G. Synthesis and binding affinities of a series of 1,2-benzisoxazole-3-carboxamides to dopamine and serotonin receptors. Eur J Med Chem 1996. [DOI: 10.1016/s0223-5234(97)86174-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [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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25
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Venisse A, Rivière M, Vercauteren J, Puzo G. Structural analysis of the mannan region of lipoarabinomannan from Mycobacterium bovis BCG. Heterogeneity in phosphorylation state. J Biol Chem 1995; 270:15012-21. [PMID: 7797482 DOI: 10.1074/jbc.270.25.15012] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [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] Open
Abstract
Lipoarabinomannan (LAM) is a major antigen of mycobacterial cell walls, involved in host-Mycobacterium interactions. In a previous work, LAM from the vaccine strain, Mycobacterium bovis BCG, was found to exhibit mannooligosaccharides at its arabinan nonreducing ends (ManLAM). The present report concerns the mannan core structure of this ManLAM. After partial hydrolysis of ManLAM, two populations of mannans (Ma1 and Ma2) were obtained by gel filtration chromatography. Their structural features were defined by means of two-dimensional homo- and heteronuclear (1H-13C) NMR sequences and methylation analysis. They were both found to be composed of an alpha-(1-->6)-linked mannan backbone with alpha-(1-->2)-Manp-linked side chains. They are highly branched, and Ma2 presents a higher frequency of branching than Ma1. Moreover, chemical analysis indicates that only Ma1 is phosphorylated. By a two-dimensional heteronuclear 1H-31P total correlation experiment, the phosphate was found to be involved in a phosphodiester bond between inositol C-1 and glycerol C-3. Then, the molecular mass of mannan was established by mass spectrometry, which revealed a molecular mass of 3517 Da for the major molecular species of Ma1. Likewise, analysis of unfractionated mannans showed the occurrence of other, quantitatively minor molecular species, endowed with two phosphates. This study clearly indicates that the mannan region of M. bovis BCG ManLAM exists as a heterogeneous population of molecules whose structures differ in their degree of glycosylation, level of branching, and phosphorylation state. The hypothesis that the relative abundance of these different molecules modulates the biological functions of LAM is discussed.
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Affiliation(s)
- A Venisse
- Laboratoire de Pharmacologie et de Toxicologie Fondamentales du CNRS, Département III, Toulouse, France
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26
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Varache-Lembège M, Nuhrich A, Renard P, Duboudin F, Vercauteren J, Devaux G. Platelet antiaggregant methoxyphenylthienyl ketoxime ethers: synthesis and structure-activity relationships. Arch Pharm (Weinheim) 1995; 328:417-24. [PMID: 7611837 DOI: 10.1002/ardp.19953280505] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [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: 01/26/2023]
Abstract
Some new oximinoalkanoic (n = 2,3,4) esters and acids derived from methoxyphenylthienyl ketones have been synthesized and evaluated in vitro for their inhibitory effects on arachidonic acid-induced human platelet aggregation. Of the eighteen oximinoethers tested the most active derivatives, which were four times more active as aspirin, belonged to the para methoxy series with Z configuration and n = 2 or 3.
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Affiliation(s)
- M Varache-Lembège
- Laboratoire de Pharmacie chimique et Chimie thérapeutique, U.F.R. des Sciences pharmaceutiques, Université de Bordeaux II, France
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27
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Noutary C, de Violet PF, Vercauteren J, Castellan A. Photochemical studies on a phenolic phenylcoumarone lignin model molecule in relation to the photodegradation of lignocellulosic materials. Part 1. Structure of the photoproducts. Res Chem Intermed 1995. [DOI: 10.1007/bf03052255] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Noutary C, de Violet PF, Vercauteren J, Castellan A. Photochemical studies on a phenolic phenylcoumarone lignin model molecule in relation to the photodegradation of lignocellulosic materials. Part 2. Photophysical and photochemical studies. Res Chem Intermed 1995. [DOI: 10.1007/bf03052256] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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29
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Gilleron M, Vercauteren J, Puzo G. Lipo-oligosaccharidic antigen from Mycobacterium gastri. Complete structure of a novel C4-branched 3,6-dideoxy-alpha-xylo-hexopyranose. Biochemistry 1994; 33:1930-7. [PMID: 8110798 DOI: 10.1021/bi00173a041] [Citation(s) in RCA: 17] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The following incomplete structure, alpha-X-(1-->3)-[beta-L-Xylp-(1-->4)]6-3-O-Me-alpha-Rhap-(1- ->3)- beta-D-Galp-(1-->3)-beta-D-Glcp-(1-->4)-2-O-acyl-alpha-D-Glcp-(1<-->1)-4 ,6-di-O-acyl-alpha-D-Glcp, was previously established for the antigenic lipo-oligosaccharide typifying Mycobacterium gastri, namely, LOS-III. The partial structure of the distal monosaccharide (X) was assigned as 3,6-dideoxy-4-C-(1,3-di-O-methylpropyl)-alpha-hexopyranose, which corresponds to a new-found monosaccharide in nature [Gilleron M., Vercauteren J., & Puzo G. (1993) J. Biol. Chem. 268, 3168-3179]. This article reports the complete structure of X, which was determined from the FAB-MS and 2D NMR analysis of the peracetylated LOS-III. The comparative analyses of the native and per-O-acetylated LOS-III FAB-MS spectra revealed, for the monosaccharide X, a molecular mass of 370 Da and five hydroxyl groups that could be acetylated. Additionally, the 1D 1H NMR spectrum of the per-O-acetylated LOS-III showed a dramatically increased dispersion of the protons, which resonated between 3 and 4 ppm in the spectrum of the underivatized LOS-III. Thus, thanks to 2D NMR sequences (COSY, HOHAHA, HMQC, HMQC-HOHAHA, and HMBC), the complete assignment of the 1H and 13C signals was achieved. Starting from the quaternary C4 resonance, the spin system of the C-alkyl chain was assigned, allowing us to propose the following structure, 3,6-dideoxy-4-C-(1,3-dimethoxy-4,5,6,7-tetrahydroxyheptyl)-alpha-x ylo- hexopyranose. The xylo configuration was established from the ROESY spectrum.
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Affiliation(s)
- M Gilleron
- Laboratoire de Pharmacologie et de Toxicologie Fondamentales du Centre National de la Recherche Scientifique, Département III, Toulouse, France
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30
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Lacoste AM, Dumora C, Balas L, Hammerschmidt F, Vercauteren J. Stereochemistry of the reaction catalysed by 2-aminoethylphosphonate aminotransferase. A 1H-NMR study. Eur J Biochem 1993; 215:841-4. [PMID: 8394813 DOI: 10.1111/j.1432-1033.1993.tb18100.x] [Citation(s) in RCA: 11] [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] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
(R)- and (S)-2-amino[2-D1]ethylphosphonic acids ([2-D1]AEP) were synthesised to investigate the stereochemistry of the reaction catalysed by 2-aminoethlphosphonate aminotransferase from Pseudomonas aeruginosa. This enzyme catalyses the transfer of the amino group of AEP to pyruvate to produce 2-phosphonoacetaldehyde and alanine. The enzymic reaction proceeding through the abstraction of a proton from the Schiff-base complex formed between the enzyme-bound pyridoxal 5'-phosphate, and the substrate, was carried out in an aqueous buffer at pH 8.5; it was followed by high-field 1H-NMR measurements (500 MHz, H2O) on an AMX 500 Bruker spectrometer. The spectra, recorded with chiral (R)- or (S)-[2-D1]AEP, both showed the methylenic signal (3.0 ppm), whereas (S)-[2-D1]AEP gave the additional aldehydic signal (CHO, 9.6 ppm). These data clearly show that AEP-aminotransferase catalyses the abstraction of the pro-S hydrogen atom at the prochiral C2 carbon of AEP. Furthermore, careful timing of NMR measurements over a 2-hour period allows us to show the occurrence of an isotopic effect.
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Affiliation(s)
- A M Lacoste
- Département de Biochimie Médicale et Biologie Moléculaire, Université de Bordeaux II, France
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31
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Rivière M, Augé S, Vercauteren J, Wisingerovà E, Puzo G. Structure of a novel glycopeptidolipid antigen containing a O-methylated serine isolated from Mycobacterium xenopi. Complete 1H-NMR and 13C-NMR assignment. Eur J Biochem 1993; 214:395-403. [PMID: 8513789 DOI: 10.1111/j.1432-1033.1993.tb17935.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
GPL X-1, a novel glycopeptidolipid (GPL) isolated from Mycobacterium xenopi (CIPT 140 35004), has recently been found to typify a new class of mycobacterial glycopeptidolipids devoid of C-mycoside core structure, the so-called serine-containing glycopeptidolipid [Rivière, M. & Puzo, G. (1991) J. Biol. Chem. 266, 9057-9063]. Here we report the purification and characterization of a novel serine-containing GPL termed GPL X-IIb, isolated from the M. xenopi strain NCTC 10042. On thin-layer chromatography, this GPL was found to be present in some other M. xenopi strains isolated from patients with pulmonary infections. The sugar and amino-acid compositions of this GPL were elucidated from the native form using a combination of two-dimensional homonuclear and heteronuclear scalar coupling NMR. The peptide and sugar sequences, as well as the methoxyl group locations on the C-3 of the 6-deoxy-alpha-L-talopyranoside (6dTalp) and on a Ser, were unambiguously determined by heteronuclear multiple-bond correlation experiments. GPL X-IIb was found to be composed of a lipotetrapeptide of the following structure C12-Ser-OMe-Ser-Phe-aThr-OMe (aThr = allothreonine). The sugar part is made up of 3OMe-alpha-L-6dTalp and the following disaccharide: alpha-L-Rhap-(1-->3)-2-O-Lau-alpha-L-Rhap (Rhap = rhanmopyranose). Unlike GPL X-I, the sugar attachment sites on the tetrapeptide were successfully determined from heteronuclear three-bond coupling correlation observed in the heteronuclear multiple bond correlation spectrum between the anomeric carbon resonances and the beta protons of aThr-OMe and Ser. It was established that the 3OMe-6dTalp glycosylates the Ser while the disaccharide is linked to the aThr-OMe. Thus both GPL X-I and GPL X-IIb share a common lipotetrapeptide core [with the exception of Ser(OMe)] but drastically differ in their oligosaccharide appendage. Thus, by analogy with the M. avium complex, the present report suggests that M. xenopi species can be divided in various serovars characterized by the unique structure of their C-mycoside GPL oligosaccharide appendage, enhancing the interest for this new type of serine-containing glycopeptidolipid.
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Affiliation(s)
- M Rivière
- Laboratoire de Pharmacologie et de Toxicologie Fondamentales du Centre National de la Recherche Scientifique, Toulouse, France
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32
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Gilleron M, Vercauteren J, Puzo G. Lipooligosaccharidic antigen containing a novel C4-branched 3,6-dideoxy-alpha-hexopyranose typifies Mycobacterium gastri. J Biol Chem 1993; 268:3168-79. [PMID: 8428994] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Lipooligosaccharides (LOSs) have recently been proposed as markers of mycobacterial avirulence. They have been characterized in Mycobacterium kansasii cell wall and were investigated in Mycobacterium gastri since the distinction between the two mycobacterial species remains in some question. A set of unknown LOSs was isolated from M. gastri W471. The highly antigenic lipooligosaccharide, LOS-III, was purified and appeared in all the M. gastri strains investigated regardless of their morphology. Moreover, by enzyme-linked immunosorbent assay and chromatographic approaches, it was found that LOS-III unambiguously distinguished M. gastri from the opportunistic pathogen M. kansasii. The LOS-III structure was established from its native form using NMR spectroscopy. This strategy revealed the presence of a supplementary monosaccharide (X) which was not characterized by routine carbohydrate analysis. Its core structure, 3,6-dideoxy-alpha-hexopyranose, was established from the complete assignment of the 1H and 13C spectra by two-dimensional homonuclear (COSY, HOHAHA) and heteronuclear 1H-13C heteronuclear multiple quantum correlation spectroscopy (HMQC) and HMQC-HOHAHA spectroscopy. Due to the absence of a proton at C4, the key data of the C4 side chain structure came from the heteronuclear multiple bond correlation spectroscopy (HMBC) spectrum. It was revealed to be a C-alkyl chain of partial structure 1,3-dimethoxypropyl. From the HMBC spectrum, this novel C-branched monosaccharide was located at the nonreducing end of the LOS, while the putative reducing end was found to consist of a 2',4,6-triacylated alpha-alpha-trehalose. The following structure, based on the evidence presented in this paper, is proposed for LOS-III: Xp alpha(1-->3)[L-Xylp beta(1-->4)](6)3-O-Me-Rhap alpha(1-->3)D- Galp beta(1-->3)-D-Glcp beta(1-->4)2-O-acyl-D-Glcp-alpha(1<==>1)alpha 4,6-di-O- acyl-D-Glcp.
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Affiliation(s)
- M Gilleron
- Laboratoire de Pharmacologie et de Toxicologie Fondamentales, Centre National de la Recherche Scientifique, Toulouse, France
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Vercauteren J. [Bibliography on psychiatry]. FNIB 1976; 54:suppl 13-5. [PMID: 793877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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