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Nars A, Rey T, Lafitte C, Vergnes S, Amatya S, Jacquet C, Dumas B, Thibaudeau C, Heux L, Bottin A, Fliegmann J. An experimental system to study responses of Medicago truncatula roots to chitin oligomers of high degree of polymerization and other microbial elicitors. Plant Cell Rep 2013; 32:489-502. [PMID: 23314495 DOI: 10.1007/s00299-012-1380-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 12/06/2012] [Accepted: 12/12/2012] [Indexed: 05/18/2023]
Abstract
A fully acetylated, soluble CO preparation of mean DP of ca. 7 was perceived with high sensitivity by M. truncatula in a newly designed versatile root elicitation assay. The root system of legume plants interacts with a large variety of microorganisms, either pathogenic or symbiotic. Understanding how legumes recognize and respond specifically to pathogen-associated or symbiotic signals requires the development of standardized bioassays using well-defined preparations of the corresponding signals. Here we describe the preparation of chitin oligosaccharide (CO) fractions from commercial chitin and their characterization by a combination of liquid-state and solid-state nuclear magnetic resonance spectroscopy. We show that the CO fraction with highest degree of polymerization (DP) became essentially insoluble after lyophilization. However, a fully soluble, fully acetylated fraction with a mean DP of ca. 7 was recovered and validated by showing its CERK1-dependent activity in Arabidopsis thaliana. In parallel, we developed a versatile root elicitation bioassay in the model legume Medicago truncatula, using a hydroponic culture system and the Phytophthora β-glucan elicitor as a control elicitor. We then showed that M. truncatula responded with high sensitivity to the CO elicitor, which caused the production of extracellular reactive oxygen species and the transient induction of a variety of defense-associated genes. In addition, the bioassay allowed detection of elicitor activity in culture filtrates of the oomycete Aphanomyces euteiches, opening the way to the analysis of recognition of this important legume root pathogen by M. truncatula.
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Affiliation(s)
- A Nars
- Université de Toulouse, UPS, UMR5546, Laboratoire de Recherche en Sciences Végétales (LRSV), BP 42617, 31326, Castanet-Tolosan, France
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Thibaudeau C, Flandrois G, Piteux E, Auffray F, Martin S, Simon P, Laviron B, Duvieu N, Morineau C, Leaute AG, Dehaut F, Derenne S. [Optimization of a haematopoietic stem cell freezing process using a qualification protocol applicable to a programmable freezer]. Transfus Clin Biol 2011; 18:542-52. [PMID: 22019609 DOI: 10.1016/j.tracli.2011.02.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2010] [Accepted: 02/19/2011] [Indexed: 12/01/2022]
Abstract
BACKGROUND The freezing phase is a critical step of the freezing process of the hematopoietic stem cells. To standardize the decrease of the temperature, the use of a programmable freezer is recommended. There is no available protocol, neither to describe exactly the validation of a programmable freezer, nor to prove the performance of the freezing/thawing step of the grafts. METHOD We describe a validation protocol with three phases: first a qualification of installation, then an operational qualification and finally, a qualification of performance. The validation is performed in tandem between the freezer which is routinely used (Nicool Plus) and a new one (Freezal). RESULTS With this protocol, we demonstrate the efficacy of the freezing program and its ability to assure the quality of the grafts reinjected to the patients, particularly in terms of cellular efficiency on CD34+ hematopoietic stem cells. On these cells, we measured a significant increase of cellular efficiency (+10%) after freezing with the Freezal. CONCLUSION Here, we propose a validation protocol which is able to qualify a programmable freezer. This protocol can optimize the capability of the freezer and is able to prove its performance.
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Affiliation(s)
- C Thibaudeau
- Unité d'ingénierie cellulaire, établissement français du sang, 34, boulevard Jean-Monnet, 44011 Nantes cedex 1, France
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Thibaudeau C, Chattopadhyaya J. The Discovery of Intramolecular Stereoelectronic Forces That Drive The Sugar Conformation in Nucleosides and Nucleotides. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/07328319708002912] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- C. Thibaudeau
- a Department of Bioorganic Chemistry , Box 581 Biomedical Center, Uppsala University , Uppsala , S-751 23 , Sweden
| | - J. Chattopadhyaya
- a Department of Bioorganic Chemistry , Box 581 Biomedical Center, Uppsala University , Uppsala , S-751 23 , Sweden
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Bénédet F, Leroy T, Gauthier N, Thibaudeau C, Thibout E, Renault S. Gustatory sensilla sensitive to protein kairomones trigger host acceptance by an endoparasitoid. Proc Biol Sci 2002; 269:1879-86. [PMID: 12350249 PMCID: PMC1691116 DOI: 10.1098/rspb.2002.2077] [Citation(s) in RCA: 15] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Proteins isolated from the host cocoon of Acrolepiopsis assectella (Lepidoptera: Yponomeutoidea) act as kairomones for host acceptance by the endoparasitoid wasp Diadromus pulchellus Wesmael (Hymenoptera: Ichneumonidae). In this study, morphological, ultrastructural and electrophysiological studies were carried out in order to identify the contact chemoreceptive sensilla on the parasitoid antennae that perceive the protein kairomones. Three types of sensillum on the antennae of the females were found to have a chemosensory function. The receptor cell(s) of one sensillar type were shown to give a positive electrophysiological response to protein kairomones. This sensillar type is apically multiporous and female specific. Consequently, this sensillum could be the one implicated in the perception of the protein kairomone that triggers the host-acceptance behaviour of D. pulchellus females.
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Affiliation(s)
- F Bénédet
- Institut de Recherche sur la Biologie de l'Insecte, CNRS ESA 6035, France
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Acharya P, Thibaudeau C, Chattopadhyaya J. An energetic correlation of ab initio and NMR studies of the 3'-gauche effect in 3'-substituted thymidines. Nucleosides Nucleotides Nucleic Acids 2001; 20:1229-33. [PMID: 11562991 DOI: 10.1081/ncn-100002524] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
A straightforward correlation of our experimental NMR findings on 3'-substituted thymidine derivatives with that of the ab initio calculations shows that (i) the delta Go298kNRM of N reversible S equilibrium in nucleoside can be predicted from the ab initio calculated delta ES-N obtained from 6-311++G** level of theory; (ii) the substituent-dependent steric and stereoelectronic effects on the bias of the two-state N reversible S equilibrium in nucleosides can also be predicted from the ab initio calculations with sufficiently large basis functions, and (iii) the necessity of mimicking the solvation behaviour of the experimental NMR measurement condition in the ab initio calculations of biomolecules is also emphasized.
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Affiliation(s)
- P Acharya
- Department of Bioorganic Chemistry, Box 581, Biomedical Centre, University of Uppsala, S-751 23 Uppsala, Sweden
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Thibaudeau C, Kumar A, Bekiroglu S, Matsuda A, Marquez VE, Chattopadhyaya J. NMR Conformation of (−)-β-d-Aristeromycin and Its 2‘-Deoxy and 3‘-Deoxy Counterparts in Aqueous Solution. J Org Chem 1998. [DOI: 10.1021/jo980364y] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- C. Thibaudeau
- Department of Bioorganic Chemistry, Box 581, Biomedical Center, University of Uppsala, S-751 23 Uppsala, Sweden, Laboratory of Medicinal Chemistry, DPT, DCT, National Cancer Institute, NIH, Bethesda, Maryland 20892, and Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060, Japan
| | - A. Kumar
- Department of Bioorganic Chemistry, Box 581, Biomedical Center, University of Uppsala, S-751 23 Uppsala, Sweden, Laboratory of Medicinal Chemistry, DPT, DCT, National Cancer Institute, NIH, Bethesda, Maryland 20892, and Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060, Japan
| | - S. Bekiroglu
- Department of Bioorganic Chemistry, Box 581, Biomedical Center, University of Uppsala, S-751 23 Uppsala, Sweden, Laboratory of Medicinal Chemistry, DPT, DCT, National Cancer Institute, NIH, Bethesda, Maryland 20892, and Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060, Japan
| | - A. Matsuda
- Department of Bioorganic Chemistry, Box 581, Biomedical Center, University of Uppsala, S-751 23 Uppsala, Sweden, Laboratory of Medicinal Chemistry, DPT, DCT, National Cancer Institute, NIH, Bethesda, Maryland 20892, and Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060, Japan
| | - V. E. Marquez
- Department of Bioorganic Chemistry, Box 581, Biomedical Center, University of Uppsala, S-751 23 Uppsala, Sweden, Laboratory of Medicinal Chemistry, DPT, DCT, National Cancer Institute, NIH, Bethesda, Maryland 20892, and Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060, Japan
| | - J. Chattopadhyaya
- Department of Bioorganic Chemistry, Box 581, Biomedical Center, University of Uppsala, S-751 23 Uppsala, Sweden, Laboratory of Medicinal Chemistry, DPT, DCT, National Cancer Institute, NIH, Bethesda, Maryland 20892, and Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060, Japan
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Thibaudeau C, Plavec J, Chattopadhyaya J. Quantitation of the pD Dependent Thermodynamics of the N ⇄ S Pseudorotational Equilibrium of the Pentofuranose Moiety in Nucleosides Gives a Direct Measurement of the Strength of the Tunable Anomeric Effect and the pKa of the Nucleobase†. J Org Chem 1996. [DOI: 10.1021/jo951124a] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- C. Thibaudeau
- Department of Bioorganic Chemistry, Box 581, Biomedical Centre, University of Uppsala, S-751 23 Uppsala, Sweden
| | - J. Plavec
- Department of Bioorganic Chemistry, Box 581, Biomedical Centre, University of Uppsala, S-751 23 Uppsala, Sweden
| | - J. Chattopadhyaya
- Department of Bioorganic Chemistry, Box 581, Biomedical Centre, University of Uppsala, S-751 23 Uppsala, Sweden
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