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Guilhot F, Rigal-Huguet F, Guilhot J, Guerci-Bresler AP, Maloisel F, Rea D, Coiteux V, Gardembas M, Berthou C, Vekhoff A, Jourdan E, Berger M, Fouillard L, Alexis M, Legros L, Rousselot P, Delmer A, Lenain P, Escoffre Barbe M, Gyan E, Bulabois CE, Dubruille V, Joly B, Pollet B, Cony-Makhoul P, Johnson-Ansah H, Mercier M, Caillot D, Charbonnier A, Kiladjian JJ, Chapiro J, Penot A, Dorvaux V, Vaida I, Santagostino A, Roy L, Zerazhi H, Deconinck E, Maisonneuve H, Plantier I, Lebon D, Arkam Y, Cambier N, Ghomari K, Miclea JM, Glaisner S, Cayuela JM, Chomel JC, Muller M, Lhermitte L, Delord M, Preudhomme C, Etienne G, Mahon FX, Nicolini FE. Long-term outcome of imatinib 400 mg compared to imatinib 600 mg or imatinib 400 mg daily in combination with cytarabine or pegylated interferon alpha 2a for chronic myeloid leukaemia: results from the French SPIRIT phase III randomised trial. Leukemia 2021; 35:2332-2345. [PMID: 33483613 DOI: 10.1038/s41375-020-01117-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 11/20/2020] [Accepted: 12/15/2020] [Indexed: 01/29/2023]
Abstract
The STI571 prospective randomised trial (SPIRIT) French trial is a four-arm study comparing imatinib (IM) 400 mg versus IM 600 mg, IM 400 mg + cytarabine (AraC), and IM 400 mg + pegylated interferon alpha2a (PegIFN-α2a) for the front-line treatment of chronic-phase chronic myeloid leukaemia (CML). Long-term analyses included overall and progression-free survival, molecular responses to treatment, and severe adverse events. Starting in 2003, the trial included 787 evaluable patients. The median overall follow-up of the patients was 13.5 years (range 3 months to 16.7 years). Based on intention-to-treat analyses, at 15 years, overall and progression-free survival were similar across arms: 85%, 83%, 80%, and 82% and 84%, 87%, 79%, and 79% for the IM 400 mg (N = 223), IM 600 mg (N = 171), IM 400 mg + AraC (N = 172), and IM 400 mg + PegIFN-α2a (N = 221) arms, respectively. The rate of major molecular response at 12 months and deep molecular response (MR4) over time were significantly higher with the combination IM 400 mg + PegIFN-α2a than with IM 400 mg: p = 0.0001 and p = 0.0035, respectively. Progression to advanced phases and secondary malignancies were the most frequent causes of death. Toxicity was the main reason for stopping AraC or PegIFN-α2a treatment.
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Affiliation(s)
| | | | | | | | | | - Delphine Rea
- Department of Hematology, Hopital Saint-Louis, APHP, Paris, France
| | - Valérie Coiteux
- Clinical Hematology Department, Hospital Claude Huriez, CHRU, Lille, France
| | | | | | - Anne Vekhoff
- Clinical Hematology Department, Hospital St Antoine, APHP. Sorbonne Université, Paris, France
| | - Eric Jourdan
- Hématologie Clinique, Institut de Cancérologie du Gard, CHU de Nîmes, Nîmes, France
| | - Marc Berger
- Hematologie Biologique, CHU Estaing, Clermont Ferrand, France
| | | | - Magda Alexis
- Hématologie et Thérapie Cellulaire, Grand Hôpital de l'EST Francilien, Meaux, France
| | - Laurence Legros
- Department of Haematology, Hopital Paul Brousse, AP-HP, INSERM UMRS-MD1197, Villejuif, France
| | - Philippe Rousselot
- Hematology Department, Division of Innovative Therapies, Centre Hospitalier de Versailles, Versailles and Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial Diseases (IMVA-HB/IDMIT), Fontenay-aux-Roses & Le Kremlin-Bicêtre, France
| | - Alain Delmer
- Clinical Hematology Department, CHU, Reims, France
| | - Pascal Lenain
- Clinical Hematology Department, Centre Henri Becquerel, Rouen, France
| | | | - Emmanuel Gyan
- Hematology and Cell Therapy Department, University of Tours, Tours, France
| | | | | | - Bertrand Joly
- Hématologie Clinique, CH Sud Francilien, Corbeil-Essonnes, France
| | - Bertrand Pollet
- Hématologie Clinique, CH Boulogne sur mer, Boulogne sur mer, France
| | | | | | - Melanie Mercier
- Service d'Dématologie Médecine Interne Maladies Infectieuses, Centre Hospitalier Bretagne Atlantique Vannes, Vannes, France
| | - Denis Caillot
- Hématologie Clinique, CHU Dijon Bourgogne, Dijon, France
| | - Aude Charbonnier
- Clinical Hematology Department, Institut Paoli Calmettes, Marseille, France
| | | | - Jacques Chapiro
- Service Hématologie Clinique, Hopitaux Civiles de Colmar, Colmar, France
| | - Amélie Penot
- Service Hématologie et Thérapie Cellulaire, CHU Limoges, Limoges, France
| | | | - Iona Vaida
- Hématologie Clinique, Centre Hospitalier René-Dubois, Cergy-Pontoise, France
| | | | - Lydia Roy
- Clinical Hematology Department, Hop Henri Mondor, APHP, UPEC, Créteil, France
| | - Hacene Zerazhi
- Service Oncologie Médicale et Hématologie Clinique, Centre Hospitalier Henri Duffaut, Avignon, France
| | | | | | | | - Delphine Lebon
- Service d'Hématologie Clinique CHU Amiens-Picardie, Amiens-Picardie, France
| | - Yazid Arkam
- Service d'Hématologie GHR Mulhouse, Mulhouse, France
| | | | - Kamel Ghomari
- Service d'Hématologie-Oncologie CH Beauvais, Beauvais, France
| | | | | | | | | | - Marc Muller
- Laboratoire de Génétique, CHRU Nancy, Nancy, France
| | - Ludovic Lhermitte
- Laboratory of Onco-Hematology, Assistance Publique-Hôpitaux de Paris, Hôpital Necker Enfants-Malades, Paris, France
| | - Marc Delord
- Clinical Research Department, Hôpital André Mignot, Versailles, France
| | | | - Gabriel Etienne
- Clinical Hematology Department, Institut Bergonié, Bordeaux, France
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Park S, Farooq M, Gaertner S, Bruckert C, Qureshi A, Lee H, Benrahla D, Pollet B, Stephan D, Ohlmann P, Mayoux E, Auger C, Morel O, Schini-Kerth V. Empagliflozin, a sodium-glucose cotransporter inhibitor, improved heart remodeling and mesenteric artery endothelial function in the metabolic syndrome with HFpEF ZSF1 rat: Role of cyclooxygenases. Archives of Cardiovascular Diseases Supplements 2019. [DOI: 10.1016/j.acvdsp.2019.02.101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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3
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Pracharova P, Lieben P, Pollet B, Beckerich JM, Bonnarme P, Landaud S, Swennen D. Geotrichum candidum gene expression and metabolite accumulation inside the cells reflect the strain oxidative stress sensitivity and ability to produce flavour compounds. FEMS Yeast Res 2019; 19:5116167. [PMID: 30295727 PMCID: PMC6211236 DOI: 10.1093/femsyr/foy111] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 10/04/2018] [Indexed: 12/02/2022] Open
Abstract
Geotrichum candidum is a fungus-like yeast widely used as a starter culture for cheese ripening for its proteolytic and lipolytic activities and its contribution to the cheese flavours. The sequenced strain G. candidum CLIB 918 was isolated from cheese Pont-L’Evêque. This strain's ability to produce volatile compounds was compared to the ability of a known strong sulphur compound producer G. candidum strain (Gc203). The aminotransferase-coding genes BAT2 and ARO8 were identified to be involved in methionine catabolism. The production of volatile compounds indicated that the sequenced strain was a moderate producer compared to the strong producer strain. The major volatile compounds were produced from sulphur amino acid, branched-chain amino acid and fatty acid metabolisms. Metabolite content of the cells showed that the ability of the strain to produce volatile compounds was inversely proportional to its ability to store amino acids inside the cells. Reduced glutathione, hypotaurine and taurine intracellular concentrations and volatile fatty aldehyde production indicated the role of oxidative stress sensitivity in flavour production. The increase in expression of several genes in a Reblochon-type cheese at the end of ripening confirmed that oxygen and iron were key factors regulating cheese flavour production.
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Affiliation(s)
- P Pracharova
- UMR GMPA, AgroParisTech, INRA, Université Paris-Saclay, 78850 Thiverval-Grignon, France
| | - P Lieben
- UMR GMPA, AgroParisTech, INRA, Université Paris-Saclay, 78850 Thiverval-Grignon, France
| | - B Pollet
- UMR GMPA, AgroParisTech, INRA, Université Paris-Saclay, 78850 Thiverval-Grignon, France
| | - J M Beckerich
- UMR GMPA, AgroParisTech, INRA, Université Paris-Saclay, 78850 Thiverval-Grignon, France
| | - P Bonnarme
- UMR GMPA, AgroParisTech, INRA, Université Paris-Saclay, 78850 Thiverval-Grignon, France
| | - S Landaud
- UMR GMPA, AgroParisTech, INRA, Université Paris-Saclay, 78850 Thiverval-Grignon, France
| | - D Swennen
- UMR GMPA, AgroParisTech, INRA, Université Paris-Saclay, 78850 Thiverval-Grignon, France
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Gaertner S, Farooq MA, Pollet B, Amoura L, Khemais-Benkhiat S, Park S, Geny B, Toti F, Stephan D, Auger C, Schini-Kerth VB. P2622Ageing-related endothelial dysfunction in the femoral vein is mediated by cyclooxygenases: Role of thromboxane prostanoid receptors. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p2622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- S Gaertner
- University Hospital of Strasbourg, Department of Vascular Diseases and Hypertension, Strasbourg, France
| | - M A Farooq
- University of Strasbourg, INSERM UMR 1260, Regenerative Nanomedicine, Strasbourg, France
| | - B Pollet
- University of Strasbourg, CNRS UMR 7021, Laboratory of Bioimaging and Pathologies, Strasbourg, France
| | - L Amoura
- University of Strasbourg, INSERM UMR 1260, Regenerative Nanomedicine, Strasbourg, France
| | - S Khemais-Benkhiat
- University of Strasbourg, INSERM UMR 1260, Regenerative Nanomedicine, Strasbourg, France
| | - S Park
- University of Strasbourg, INSERM UMR 1260, Regenerative Nanomedicine, Strasbourg, France
| | - B Geny
- University of Strasbourg, EA 3072, Mitochondrie, Stress oxydant et Protection musculaire, Strasbourg, France
| | - F Toti
- University of Strasbourg, INSERM UMR 1260, Regenerative Nanomedicine, Strasbourg, France
| | - D Stephan
- University Hospital of Strasbourg, Department of Vascular Diseases and Hypertension, Strasbourg, France
| | - C Auger
- University of Strasbourg, INSERM UMR 1260, Regenerative Nanomedicine, Strasbourg, France
| | - V B Schini-Kerth
- University of Strasbourg, INSERM UMR 1260, Regenerative Nanomedicine, Strasbourg, France
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5
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Altamimy R, Qureshi A, Amoura L, El Habhab A, El Itawi H, Kassem M, Khemais S, Pollet B, El-Ghazouani F, Auger C, Schini-Kerth V, Toti F. Leukocyte-derived microparticles exaggerate endothelial senescence and vascular dysfunction induced by high glucose. Archives of Cardiovascular Diseases Supplements 2018. [DOI: 10.1016/j.acvdsp.2018.02.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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6
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Jourdren S, Saint-Eve A, Pollet B, Panouillé M, Lejeune P, Guichard E, Déléris I, Souchon I. Gaining deeper insight into aroma perception: An integrative study of the oral processing of breads with different structures. Food Res Int 2017; 92:119-127. [DOI: 10.1016/j.foodres.2017.01.001] [Citation(s) in RCA: 12] [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: 10/11/2016] [Revised: 12/16/2016] [Accepted: 01/02/2017] [Indexed: 11/26/2022]
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7
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Burgé G, Flourat AL, Pollet B, Spinnler HE, Allais F. 3-Hydroxypropionaldehyde (3-HPA) quantification by HPLC using a synthetic acrolein-free 3-hydroxypropionaldehyde system as analytical standard. RSC Adv 2015. [DOI: 10.1039/c5ra18274c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
HPLC-based quantification of 3-HPA using a synthetic acrolein-free 3-HPA standard obtained from commercially available 1,2,4-butanetriol through a straightforward and easy synthetic process.
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Affiliation(s)
- G. Burgé
- Chaire Agro-Biotechnologies Industrielles (ABI)
- AgroParisTech
- F-51100 Reims
- France
- AgroParisTech
| | - A. L. Flourat
- Chaire Agro-Biotechnologies Industrielles (ABI)
- AgroParisTech
- F-51100 Reims
- France
- AgroParisTech
| | - B. Pollet
- AgroParisTech
- UMR 782 Génie et Microbiologie des Procédés Alimentaires (GMPA)
- F-78850 Thiverval-Grignon
- France
- INRA
| | - H. E. Spinnler
- AgroParisTech
- UMR 782 Génie et Microbiologie des Procédés Alimentaires (GMPA)
- F-78850 Thiverval-Grignon
- France
- INRA
| | - F. Allais
- Chaire Agro-Biotechnologies Industrielles (ABI)
- AgroParisTech
- F-51100 Reims
- France
- AgroParisTech
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8
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Burgé G, Flourat AL, Pollet B, Spinnler HE, Allais F. Correction: 3-Hydroxypropionaldehyde (3-HPA) quantification by HPLC using a synthetic acrolein-free 3-hydroxypropionaldehyde system as analytical standard. RSC Adv 2015. [DOI: 10.1039/c5ra90099a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Correction for ‘3-Hydroxypropionaldehyde (3-HPA) quantification by HPLC using a synthetic acrolein-free 3-hydroxypropionaldehyde system as analytical standard’ by G. Burgé et al., RSC Adv., 2015, 5, 92619–92627.
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Affiliation(s)
- G. Burgé
- Chaire Agro-Biotechnologies Industrielles (ABI)
- AgroParisTech
- F-51100 Reims
- France
- AgroParisTech
| | - A. L. Flourat
- Chaire Agro-Biotechnologies Industrielles (ABI)
- AgroParisTech
- F-51100 Reims
- France
- AgroParisTech
| | - B. Pollet
- AgroParisTech
- UMR 782 Génie et Microbiologie des Procédés Alimentaires (GMPA)
- F-78850 Thiverval-Grignon
- France
- INRA
| | - H. E. Spinnler
- AgroParisTech
- UMR 782 Génie et Microbiologie des Procédés Alimentaires (GMPA)
- F-78850 Thiverval-Grignon
- France
- INRA
| | - F. Allais
- Chaire Agro-Biotechnologies Industrielles (ABI)
- AgroParisTech
- F-51100 Reims
- France
- AgroParisTech
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9
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Matsuno, M, Compagnon V, Schoch GA, Schmitt M, Debayle D, Bassard JE, Pollet B, Hehn A, Heintz D, Ullmann P, Lapierre C, Bernier F, Ehlting J, Werck-Reichhart D. Evolution of a Novel Phenolic Pathway for Pollen Development. Science 2009; 325:1688-92. [DOI: 10.1126/science.1174095] [Citation(s) in RCA: 129] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Pollet B, Steppe K, Dambre P, Van Labeke MC, Lemeur R. Photosynthesis and photosynthetic efficiency of Phalaenopsis. Commun Agric Appl Biol Sci 2009; 74:149-154. [PMID: 20420238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Affiliation(s)
- B Pollet
- Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology, Ghent University, Coupure links 653, B-9000 Ghent, Belgium
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11
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Douet-Guilbert N, Laï JL, Basinko A, Gueganic N, Andrieux J, Pollet B, Plantier I, Delattre C, Crépin O, Corm S, Le Bris MJ, Morel F, De Braekeleer M. Fluorescencein situhybridization characterization of ider(20q) in myelodysplastic syndrome. Br J Haematol 2008; 143:716-20. [DOI: 10.1111/j.1365-2141.2008.07436.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Pollet B, Steppe K, Dambre P, Van Labeke MC, Lemeur R. Growth response of Hedera helix L. to temperature integration. Commun Agric Appl Biol Sci 2007; 72:255-258. [PMID: 18018898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Affiliation(s)
- B Pollet
- Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology Ghent University, Coupure links 653, BE-9000 Gent, Belgium
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13
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Pinçon G, Maury S, Hoffmann L, Geoffroy P, Lapierre C, Pollet B, Legrand M. Repression of O-methyltransferase genes in transgenic tobacco affects lignin synthesis and plant growth. Phytochemistry 2001; 57:1167-76. [PMID: 11430989 DOI: 10.1016/s0031-9422(01)00098-x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Among the different enzymatic steps leading to lignin biosynthesis, two methylation reactions introduce the methyl groups borne by guaiacyl (G) and syringyl (S) units. Tobacco possesses a complex system of methylation comprising three classes of CCoAOMTs (caffeoyl-CoA-O-methyltransferases) and two classes of COMTs (caffeic acid OMTs). Antisense plants transformed with the CCoAOMT sequence alone or fused to COMT I sequence have been produced and compared to ASCOMT I plants in order to study the specific role of each OMT isoform in lignin biosynthesis, plant development and resistance to pathogens. Tobacco plants strongly inhibited in OMT activities have been selected and analyzed. Whereas antisense COMT I plants exhibited no visual phenotype, CCoAOMT repression was shown to strongly affect the development of both single and double transformants: a reduction of plant growth and the alteration of flower development were observed in the most inhibited plants. Lignin analysis performed by Klason and thioacidolysis methods, showed a decrease in the lignin quantity and changes in the lignin structure of ASCCoAOMT and ASCCoAOMT/ASCOMT I transgenics but not in ASCOMT I plants. Inhibition of COMT I in single as well as in double transformed tobacco was demonstrated to decrease S unit synthesis and to provoke the accumulation of 5-hydroxyguaiacyl lignin units. ASCCoAOMT/ASCOMT I tobacco was affected in lignin amount and composition, thus demonstrating additive effects of inhibition of both enzymes. The changes of lignin profiles and the phenotypical and molecular alterations observed in the different transgenic lines were particularly prominent at the later stages of plant development.
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Affiliation(s)
- G Pinçon
- Institut de Biologie Moléculaire des Plantes du Centre National de la Recherche Scientifique, Université Louis Pasteur, 12, rue du Général Zimmer, 67084 Strasbourg cedex, France
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14
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Abstract
Maize bran heteroxylan samples were extracted in various conditions of severity. Their ferulate and diferulate content was investigated by GC-MS of methyl ester-TMSi derivatives. When extracted by 0.5 M NaOH in mild conditions, the heteroxylan sample contained a low level of ferulic acid (0.032% by wt.) and the main diferulate surviving alkaline extraction was found to be the 8-8' diferulate. On peroxidase treatment, this sample nevertheless produced a firm and brittle gel without any change in the diferulate profile. Typical lignin structures, mainly comprising syringyl units interconnected through beta-O-4, beta-1 and beta-beta interunit bonds, were evidenced in the maize bran sample. More importantly, these lignin structures were found to be tightly associated with the alkali-extracted heteroxylans. Thioacidolysis revealed the occurrence of 0.1-0.5% (by wt.) lignin structures in heteroxylan fractions extracted in mild or severe conditions, before and after purification of the polysaccharides. The gelling potential of the heteroxylan fractions was not only dependent on their ferulate level, but also influenced by associated lignin structures. These results argue for the occurrence of covalent linkages between heteroxylan chains and lignin structures which could participate in the peroxidase-driven gelation of feruloylated polysaccharides. They demonstrate the role of low lignin levels in the organization of native or reconstructed polysaccharide networks.
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Affiliation(s)
- C Lapierre
- Laboratoire de Chimie Biologique, INRA-INAPG, Institut National Agronomique, 78850, Thiverval-Grignon, France.
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Pinçon G, Chabannes M, Lapierre C, Pollet B, Ruel K, Joseleau JP, Boudet AM, Legrand M. Simultaneous down-regulation of caffeic/5-hydroxy ferulic acid-O-methyltransferase I and cinnamoyl-coenzyme A reductase in the progeny from a cross between tobacco lines homozygous for each transgene. Consequences for plant development and lignin synthesis. Plant Physiol 2001; 126:145-55. [PMID: 11351078 PMCID: PMC102289 DOI: 10.1104/pp.126.1.145] [Citation(s) in RCA: 27] [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] [Received: 08/22/2000] [Revised: 10/10/2000] [Accepted: 02/23/2001] [Indexed: 05/18/2023]
Abstract
Inhibition of specific lignin biosynthetic steps by antisense strategy has previously been shown to alter lignin content and/or structure. In this work, homozygous tobacco (Nicotiana tabacum) lines transformed with cinnamoyl-coenzyme A reductase (CCR) or caffeic acid/5-hydroxy ferulic acid-O-methyltransferase I (COMT I) antisense sequences have been crossed and enzyme activities, lignin synthesis, and cell wall structure of the progeny have been analyzed. In single transformed parents, CCR inhibition did not affect COMT I expression, whereas marked increases in CCR activity were observed in COMT I antisense plants, suggesting potential cross talk between some genes of the pathway. In the progeny, both CCR and COMT I activities were shown to be markedly decreased due to the simultaneous repression of the two genes. In these double transformants, the lignin profiles were dependent on the relative extent of down-regulation of each individual enzyme. For the siblings issued from a strongly repressed antisense CCR parent, the lignin patterns mimicked the patterns obtained in single transformants with a reduced CCR activity. In contrast, the specific lignin profile of COMT I repression could not be detected in double transformed siblings. By transmission electron microscopy some cell wall loosening was detected in the antisense CCR parent but not in the antisense COMT I parent. In double transformants, immunolabeling of non-condensed guaiacyl-syringyl units was weaker and revealed changes in epitope distribution that specifically affected vessels. Our results more widely highlight the impact of culture conditions on phenotypes and gene expression of transformed plants.
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Affiliation(s)
- G Pinçon
- Institut de Biologie Moléculaire des Plantes du Centre National de la Recherche Scientifique, Université Louis Pasteur, 67084 Strasbourg cedex, France
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Meyermans H, Morreel K, Lapierre C, Pollet B, De Bruyn A, Busson R, Herdewijn P, Devreese B, Van Beeumen J, Marita JM, Ralph J, Chen C, Burggraeve B, Van Montagu M, Messens E, Boerjan W. Modifications in lignin and accumulation of phenolic glucosides in poplar xylem upon down-regulation of caffeoyl-coenzyme A O-methyltransferase, an enzyme involved in lignin biosynthesis. J Biol Chem 2000; 275:36899-909. [PMID: 10934215 DOI: 10.1074/jbc.m006915200] [Citation(s) in RCA: 124] [Impact Index Per Article: 5.2] [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: 11/06/2022] Open
Abstract
Caffeoyl-coenzyme A O-methyltransferase (CCoAOMT) methylates, in vitro, caffeoyl-CoA and 5-hydroxyferuloyl-CoA, two possible precursors in monolignol biosynthesis in vivo. To clarify the in vivo role of CCoAOMT in lignin biosynthesis, transgenic poplars with 10% residual CCoAOMT protein levels in the stem xylem were generated. Upon analysis of the xylem, the affected transgenic lines had a 12% reduced Klason lignin content, an 11% increased syringyl/guaiacyl ratio in the noncondensed lignin fraction, and an increase in lignin-attached p-hydroxybenzoate but otherwise a lignin composition similar to that of wild type. Stem xylem of the CCoAOMT-down-regulated lines had a pink-red coloration, which coincided with an enhanced fluorescence of mature vessel cell walls. The reduced production of CCoAOMT caused an accumulation of O(3)-beta-d-glucopyranosyl-caffeic acid, O(4)-beta-d-glucopyranosyl-vanillic acid, and O(4)-beta-d-glucopyranosyl-sinapic acid (GSA), as authenticated by (1)H NMR. Feeding experiments showed that O(3)-beta-d-glucopyranosyl-caffeic acid and GSA are storage or detoxification products of caffeic and sinapic acid, respectively. The observation that down-regulation of CCoAOMT decreases lignin amount whereas GSA accumulates to 10% of soluble phenolics indicates that endogenously produced sinapic acid is not a major precursor in syringyl lignin biosynthesis. Our in vivo results support the recently obtained in vitro enzymatic data that suggest that the route from caffeic acid to sinapic acid is not used for lignin biosynthesis.
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Affiliation(s)
- H Meyermans
- Vakgroep Moleculaire Genetica & Departement Plantengenetica, Vlaams Interuniversitair Instituut voor Biotechnologie, Universiteit Gent, B-9000 Gent, Belgium
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Hihn JY, Bereziat D, Doche ML, Chaillet P, Lorimer JP, Mason TJ, Pollet B. Double-structured ultrasonic high frequency reactor using an optimised slant bottom. Ultrason Sonochem 2000; 7:201-205. [PMID: 11062876 DOI: 10.1016/s1350-4177(99)00033-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The present work has been carried out in order to design a new type of ultrasonic reactor consisting of a double-structured tank. The inner working compartment is built with a slant bottom to allow a better ultrasonic transmission. This paper reports the effect of the inclination angle on acoustic efficiency for several different plates, e.g. two plates made of glass (2 mm and 3 mm thickness) and one made of PVC (3 mm thickness). The acoustic efficiency was determined as the ratio of the signal measured by a hydrophone in the presence of the plate to that signal in the absence of the plate. Having optimised the system, the ultrasonic powers in the inner and the outer compartments of the slant bottom reactor were determined by hydrogen peroxide dosimetry.
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Affiliation(s)
- J Y Hihn
- Laboratoire de Corrosion et Traitements de Surface, Equipe de l'IUT, Besançon, France.
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Jouanin L, Goujon T, de Nadaï V, Martin MT, Mila I, Vallet C, Pollet B, Yoshinaga A, Chabbert B, Petit-Conil M, Lapierre C. Lignification in transgenic poplars with extremely reduced caffeic acid O-methyltransferase activity. Plant Physiol 2000; 123:1363-74. [PMID: 10938354 PMCID: PMC59094 DOI: 10.1104/pp.123.4.1363] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/1999] [Accepted: 04/24/2000] [Indexed: 05/18/2023]
Abstract
Transgenic poplars (Populus tremula x Populus alba) were obtained by introduction of a sense homologous transgene encoding caffeic acid O-methyltransferase (COMT) under the control either of the cauliflower mosaic virus double 35S promoter or of the eucalyptus cinnamyl alcohol dehydrogenase promoter. Although these constructs conferred a moderate overexpression of COMT in some lines, a transgenic line with the double 35S promoter was found where COMT activity in woody tissues was close to zero due to a gene-silencing phenomenon. For the first time in COMT down-regulated trees, this alteration substantially reduced lignin level in 6-month-old trees (17% decrease). Lignin structure was found to be strongly altered, with a two times higher content in condensed bonds, an almost complete lack of syringyl units, and the incorporation of 5-hydroxyguaiacyl units to the most remarkable extent reported so far. Consistent with the higher cellulose content and with the higher condensation degree of the lignin, the impact of the transformation on the kraft-pulping performances of the poplar trees positively affected the pulp yield (10% relative increase), but made lignins less amenable to industrial degradations.
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Affiliation(s)
- L Jouanin
- Biologie Cellulaire, Institut National de la Recherche Agronomique, 78026 Versailles cedex, France.
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Lequart C, Ruel K, Lapierre C, Pollet B, Kurek B. Abiotic and enzymatic degradation of wheat straw cell wall: a biochemical and ultrastructural investigation. J Biotechnol 2000; 80:249-59. [PMID: 10949315 DOI: 10.1016/s0168-1656(00)00267-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The action of an abiotic lignin oxidant and a diffusible xylanase on wheat straw was studied and characterized at the levels of the molecular structures by chemical analysis and of the cell wall ultrastructure by transmission electron microscopy. While distinct chemical changes in the target polymers were observed when each system was used separately, a combination of the two types of catalysts did not significantly increase either lignin oxidation or hemicellulose hydrolysis. Microscopic observations however revealed that the supramolecular organization of the cell wall polymers was significantly altered. This suggests that the abiotic Mn-oxalate complex and the xylanase cooperate in modifying the cell wall architecture, without noticeably enhancing the degradation of the constitutive polymers.
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Affiliation(s)
- C Lequart
- Institut National de la Recherche Agronomique (INRA), Unité de Physicochimie et Biotechnologie des Polymères (UPBP), Equipe de Fractionnement Enzymatique, Reims, France
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Lapierre C, Pollet B, MacKay JJ, Sederoff RR. Lignin structure in a mutant pine deficient in cinnamyl alcohol dehydrogenase. J Agric Food Chem 2000; 48:2326-31. [PMID: 10888545 DOI: 10.1021/jf991398p] [Citation(s) in RCA: 16] [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: 05/18/2023]
Abstract
Cinnamyl alcohol dehydrogenase (CAD) activity is deficient in loblolly pine (Pinus taeda L.) harboring a mutated allele of the cad gene (cad-n1). We compared lignin structure of CAD-deficient and wild-type pines, both types segregating within full-sib families obtained by controlled crosses. The type and frequency of lignin building units and distribution of interunit bonds were determined from the GC-MS analysis of thioacidolysis monomers and dimers. While the lignin content was only slightly reduced, the lignin structure was dramatically modified by the mutation in both mature and juvenile trees. Lignins from CAD-deficient pine displayed unusually high levels of coniferaldehyde and dihydroconiferyl alcohol. In addition, biphenyl and biphenyl ether bonds were in large excess in these abnormal lignins. These results suggest that the CAD-deficient pines efficiently compensate for the shortage in normal lignin precursors by utilizing nontraditional wall phenolics to construct unusual lignins particularly enriched in resistant interunit bonds.
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Affiliation(s)
- C Lapierre
- Laboratoire de Chimie Biologique INRA, Institut National Agronomique, Thiverval-Grignon, France.
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21
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Abstract
This paper describes the effect of ultrasound upon the electrochemical recovery of silver from photographic processing solutions using a newly designed electrochemical cell--SonoEcoCell. Rates of deposition of silver (obtained potentiostatically) were studied in the model 'fix' solutions (dilute aqueous Na2S2O3/NaHSO3 at a stainless steel cylinder electrode in both the absence and the presence of ultrasound. Under silent conditions, the magnitude of the cathodic potential is a major factor in the removal of silver. Under 20 kHz sonication, the rate of deposition of silver increases with increasing ultrasonic intensity. The cathode efficiency is also enhanced under insonation. The position of the ultrasonic probe with respect to the rotating cylinder electrode (RCE) was studied. It was found that for a 'face-on' geometry (probe parallel to the electrode) led to higher rate constants compared with a 'side-on' geometry (probe perpendicular to the electrode). The effect of coupling an RCE with ultrasound upon these rate constants employing the two geometry was also investigated. It was found that, employing either the face-on or the side-on geometry alone, improved rate constants were obtained below approximately 1500 and 2000 rpm, respectively.
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Affiliation(s)
- B Pollet
- Smart Water Europe Ltd., Birkenhead, UK.
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Lapierre C, Pollet B, Petit-Conil M, Toval G, Romero J, Pilate G, Leple JC, Boerjan W, Ferret V, Jouanin L. Structural alterations of lignins in transgenic poplars with depressed cinnamyl alcohol dehydrogenase or caffeic acid O-methyltransferase activity have an opposite impact on the efficiency of industrial kraft pulping. Plant Physiol 1999; 119:153-64. [PMID: 9880356 PMCID: PMC32214 DOI: 10.1104/pp.119.1.153] [Citation(s) in RCA: 181] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/1998] [Accepted: 09/22/1998] [Indexed: 05/17/2023]
Abstract
We evaluated lignin profiles and pulping performances of 2-year-old transgenic poplar (Populus tremula x Populus alba) lines severely altered in the expression of caffeic acid/5-hydroxyferulic acid O-methyltransferase (COMT) or cinnamyl alcohol dehydrogenase (CAD). Transgenic poplars with CAD or COMT antisense constructs showed growth similar to control trees. CAD down-regulated poplars displayed a red coloration mainly in the outer xylem. A 90% lower COMT activity did not change lignin content but dramatically increased the frequency of guaiacyl units and resistant biphenyl linkages in lignin. This alteration severely lowered the efficiency of kraft pulping. The Klason lignin level of CAD-transformed poplars was slightly lower than that of the control. Whereas CAD down-regulation did not change the frequency of labile ether bonds or guaiacyl units in lignin, it increased the proportion of syringaldehyde and diarylpropane structures and, more importantly with regard to kraft pulping, of free phenolic groups in lignin. In the most depressed line, ASCAD21, a substantially higher content in free phenolic units facilitated lignin solubilization and fragmentation during kraft pulping. These results point the way to genetic modification of lignin structure to improve wood quality for the pulp industry.
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Affiliation(s)
- C Lapierre
- Laboratoire de Chimie Biologique, Institut National Agronomique, F-78850, Thiverval-Grignon, France (C.L., B.P.)
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Lorimer J, Pollet B, Phull S, Mason T, Walton D. The effect upon limiting currents and potentials of coupling a rotating disc and cylindrical electrode with ultrasound. Electrochim Acta 1998. [DOI: 10.1016/s0013-4686(97)00126-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Phull SS, Newman AP, Lorimer JP, Pollet B, Mason TJ. The development and evaluation of ultrasound in the biocidal treatment of water. Ultrason Sonochem 1997; 4:157-64. [PMID: 11237035 DOI: 10.1016/s1350-4177(97)00029-1] [Citation(s) in RCA: 34] [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: 05/09/2023]
Abstract
The effect of ultrasound upon the destruction of micro-organisms has been studied and reported here. The results obtained from the work carried out has shown that ultrasound can be used effectively for water disinfection and has several advantages. When used in conjunction with chlorine it significantly reduces the number of bacteria present in water samples. Ultrasound also reduces the amount of chlorine required for disinfection. Increasing the power of ultrasound leads to greater efficiency in the destruction of bacterial cells. High frequency ultrasound is more beneficial than low frequency in the disinfection of water.
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Affiliation(s)
- S S Phull
- School of Natural and Environmental Sciences, Coventry University, UK
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Lorimer J, Pollet B, Phull S, Mason T, Walton D, Geissler U. The effect of ultrasonic frequency and intensity upon limiting currents at rotating disc and stationary electrodes. Electrochim Acta 1996. [DOI: 10.1016/0013-4686(96)00130-2] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Arondel E, Pollet B. [Digital necrosis due to an accident with a paint gun without air]. Arch Mal Prof 1968; 29:221-3. [PMID: 5740931] [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: 01/16/2023]
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