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Czernetzki C, Kunz T, Huynh S, Lamprecht A, Sprenger J, Finze M, Arrowsmith M, Braunschweig H. Synthesis and Reactivity of Tricoordinate Organoberyllium Azides. Angew Chem Int Ed Engl 2024; 63:e202401279. [PMID: 38470074 DOI: 10.1002/anie.202401279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 02/28/2024] [Accepted: 02/28/2024] [Indexed: 03/13/2024]
Abstract
A series of terminal mono- and disubstituted beryllium azides of the form [(CAAC)Be(N3)R] (R=CAACH, Dur; CAACH/CAAC=1-(2,6-diisopropylphenyl)-3,3,5,5-tetramethylpyrrolidin-2-yl/idene, Dur=2,3,5,6-tetramethylphenyl) and [L2Be(N3)2] (L=CAACNH=1-(2,6-diisopropylphenyl)-3,3,5,5-tetramethylpyrrolidin-2-imine, IiPrMe=1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene), respectively, were synthesized and characterized by NMR spectroscopy and X-ray crystallography. Thermolysis and photolysis products of these first examples of tricoordinate azidoberyllium complexes evidence extensive ligand scrambling and the formal insertion of nitrenes into the CAAC-Be bond, generating cyclic alkyl(amino)imine (CAAI) ligands. Furthermore, the reaction with a small N-heterocyclic carbene (NHC) leads to unexpected CAAC-NHC ligand exchange, while the reaction with pentaphenylborole yields the first γ-azide adduct of a borole, long postulated to be the first step in the synthesis of 1,2-azaborinines from boroles and azides.
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Affiliation(s)
- Corinna Czernetzki
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Tanja Kunz
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Silvia Huynh
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Anna Lamprecht
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Jan Sprenger
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Maik Finze
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Merle Arrowsmith
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
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Tenaillon MI, Burban E, Huynh S, Wojcik A, Thuillet AC, Manicacci D, Gérard PR, Alix K, Belcram H, Cornille A, Brault M, Stevens R, Lagnel J, Dogimont C, Vigouroux Y, Glémin S. Crop domestication as a step towards reproductive isolation. Am J Bot 2023:e16173. [PMID: 37087742 DOI: 10.1002/ajb2.16173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 04/12/2023] [Accepted: 04/13/2023] [Indexed: 05/03/2023]
Abstract
Speciation, Darwin's mystery of mysteries, is a continuous process that results in genomic divergence accompanied by the gradual increment of reproductive barriers between lineages. Since the beginning of research on the genetics of speciation, several questions have emerged such as: What are the genetic bases of incompatibilities? How many loci are necessary to prevent hybridization and how are they distributed along genomes? Can speciation occur despite gene flow and how common is ecological speciation? Early stages of divergence are key to understand the ecology and genetics of speciation, and semi-isolated species where hybrids can still be produced are particularly relevant This article is protected by copyright. All rights reserved.
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Affiliation(s)
- M I Tenaillon
- Université Paris-Saclay, INRAE, CNRS, AgroParisTech, GQE - Le Moulon, 12 route, 128, Gif-sur-Yvette, France
| | - E Burban
- Laboratoire ECOBIO_UMR 6553 UR1-CNRS, Campus de Beaulieu, Rennes, France
| | - S Huynh
- UMR DIADE, Univ Montpellier, IRD, CIRAD, 911 avenue Agropolis, Montpellier, France
| | - A Wojcik
- Université Paris-Saclay, INRAE, CNRS, AgroParisTech, GQE - Le Moulon, 12 route, 128, Gif-sur-Yvette, France
| | - A-C Thuillet
- UMR DIADE, Univ Montpellier, IRD, CIRAD, 911 avenue Agropolis, Montpellier, France
| | - D Manicacci
- Université Paris-Saclay, INRAE, CNRS, AgroParisTech, GQE - Le Moulon, 12 route, 128, Gif-sur-Yvette, France
| | - P R Gérard
- Université Paris-Saclay, INRAE, CNRS, AgroParisTech, GQE - Le Moulon, 12 route, 128, Gif-sur-Yvette, France
| | - K Alix
- Université Paris-Saclay, INRAE, CNRS, AgroParisTech, GQE - Le Moulon, 12 route, 128, Gif-sur-Yvette, France
| | - H Belcram
- Université Paris-Saclay, INRAE, CNRS, AgroParisTech, GQE - Le Moulon, 12 route, 128, Gif-sur-Yvette, France
| | - A Cornille
- Université Paris-Saclay, INRAE, CNRS, AgroParisTech, GQE - Le Moulon, 12 route, 128, Gif-sur-Yvette, France
| | - M Brault
- GAFL - Génétique et Amélioration des Fruits et Légumes, INRAE, Allée des Chênes, Montfavet, France
| | - R Stevens
- GAFL - Génétique et Amélioration des Fruits et Légumes, INRAE, Allée des Chênes, Montfavet, France
| | - J Lagnel
- GAFL - Génétique et Amélioration des Fruits et Légumes, INRAE, Allée des Chênes, Montfavet, France
| | - C Dogimont
- GAFL - Génétique et Amélioration des Fruits et Légumes, INRAE, Allée des Chênes, Montfavet, France
| | - Y Vigouroux
- UMR DIADE, Univ Montpellier, IRD, CIRAD, 911 avenue Agropolis, Montpellier, France
| | - S Glémin
- Laboratoire ECOBIO_UMR 6553 UR1-CNRS, Campus de Beaulieu, Rennes, France
- Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Sweden
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Huynh S, Arrowsmith M, Meier L, Dietz M, Härterich M, Michel M, Gärtner A, Braunschweig H. Cyclic alkyl(amino)iminates (CAAIs) as strong 2σ,4π-electron donor ligands for the stabilisation of boranes and diboranes(4): a synthetic and computational study. Dalton Trans 2023; 52:3869-3876. [PMID: 36876450 DOI: 10.1039/d3dt00298e] [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] [Indexed: 03/03/2023]
Abstract
Singly and doubly cyclic alkyl(amino)iminate (CAAI)-substituted boranes and diboranes(4) were synthesised by halosilane elimination between a silylimine and halo(di)borane precursors. 11B NMR-spectroscopic studies show that the CAAI ligand is a much stronger electron donor than amino ligands. X-ray crystallographic analyses reveal that the degree of B-NCAAI double bonding increases with the electron-withdrawing capacity of the other substituents at boron. The C-N-B bond angle displays a great flexibility, ranging from 131° to near-linear 176°, the narrowest angles being observed for NMe2-substituted derivatives and the widest angles for highly sterically demanding substituents. Density functional theory (DFT) calculations on the electronic structures of the anionic CAAI ligand compared to unsaturated and saturated N-heterocyclic iminate (NHI) ligands show that the former is the best σ donor of the three but less π-donating than the unsaturated NHI. Nevertheless, the linear (CAAI)BH2 complex displays somewhat stronger C-N and N-B π bonding than the corresponding ((S)NHI)BH2 complexes.
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Affiliation(s)
- Silvia Huynh
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Merle Arrowsmith
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Lukas Meier
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Maximilian Dietz
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Marcel Härterich
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Maximilian Michel
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Annalena Gärtner
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
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Fong A, Campbell CL, Huynh S, McCormick McPherson LJ, Teat SJ, Bebbington MWP, Dalgarno SJ. Facile synthetic routes to bridge-functionalised calix[4]arenes. Chem Commun (Camb) 2022; 58:3302-3305. [PMID: 35175262 DOI: 10.1039/d1cc06889j] [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] [Indexed: 11/21/2022]
Abstract
Ring-opening of furans at the equatorial methylene bridge positions of a calix[4]arene gives access to a range of new molecules (in good yield) that have widespread potential impact in supramolecular chemistry amongst other areas.
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Affiliation(s)
- Angela Fong
- Institute of Chemical Sciences, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, UK.
| | - Cameron L Campbell
- Institute of Chemical Sciences, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, UK.
| | - Silvia Huynh
- Institute of Chemical Sciences, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, UK.
| | - Laura J McCormick McPherson
- Station 11.3.1, Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, USA
| | - Simon J Teat
- Station 11.3.1, Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, USA
| | - Magnus W P Bebbington
- Institute of Chemical Sciences, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, UK. .,Department of Chemistry and Biochemistry, Montclair State University, 1 Normal Ave., Montclair, NJ 07043, USA
| | - Scott J Dalgarno
- Institute of Chemical Sciences, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, UK.
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Huynh S, Lee L, Haskell T. PNS67 The Humanistic Burden of Caregiving in China, Japan, and the US. Value Health Reg Issues 2020. [DOI: 10.1016/j.vhri.2020.07.486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Huynh S, Baroudjian B, Allayous C, Ballon A, Herms F, Basset-Seguin N, Mourah S, Madelaine I, Lebbé C, Delyon J. Combinaison d’un anti-PD1 à une thérapie ciblant BRAF dans le traitement du mélanome métastatique : série de 9 cas. Ann Dermatol Venereol 2018. [DOI: 10.1016/j.annder.2018.09.097] [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: 11/27/2022]
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Thilakarathna SH, Rogers M, Lan Y, Huynh S, Marangoni AG, Robinson LE, Wright AJ. Investigations of in vitro bioaccessibility from interesterified stearic and oleic acid-rich blends. Food Funct 2016; 7:1932-40. [DOI: 10.1039/c5fo01272d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [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]
Abstract
Interesterification was previously found to impact stearic acid absorption in a randomized cross-over study, when human volunteers consumed a 70 : 30 wt% high-oleic sunflower and canola stearin blend (NIE) compared to the same blend which had undergone either chemical (CIE) or enzymatic (EIE) interesterification.
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Affiliation(s)
- S. H. Thilakarathna
- Department of Human Health and Nutritional Sciences
- University of Guelph
- Guelph ON N1G 2W1 Canada
| | - M. Rogers
- Department of Food Science
- University of Guelph
- Guelph
- N1G 2W1 Canada
- New Jersey Institute of Food
| | - Y. Lan
- New Jersey Institute of Food
- Nutrition
- and Health
- Department of Food Science
- Rutgers
| | - S. Huynh
- Department of Human Health and Nutritional Sciences
- University of Guelph
- Guelph ON N1G 2W1 Canada
| | - A. G. Marangoni
- Department of Food Science
- University of Guelph
- Guelph
- N1G 2W1 Canada
| | - L. E. Robinson
- Department of Human Health and Nutritional Sciences
- University of Guelph
- Guelph ON N1G 2W1 Canada
| | - A. J. Wright
- Department of Human Health and Nutritional Sciences
- University of Guelph
- Guelph ON N1G 2W1 Canada
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Huynh S, Menzies S, Khurana T, Lin T, Yan L, N. deVore, Slater J, Rabin R. Radial Immunodiffusion (RID) to Sandwich ELISA for the Quantitation of Fel d 1 and Amb a 1 in Cat and Short Ragweed Pollen Allergenic Extracts. J Allergy Clin Immunol 2012. [DOI: 10.1016/j.jaci.2011.12.655] [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: 10/14/2022]
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Commandeur D, Giacardi C, Danguy Des Deserts M, Huynh S, Buguet-Brown ML, Ould-Ahmed M, Drouillard I. [Monitoring vancomycin in an intensive care unit: A retrospective survey on 66 patients]. Med Mal Infect 2011; 41:410-4. [PMID: 21458937 DOI: 10.1016/j.medmal.2011.01.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2010] [Revised: 01/04/2011] [Accepted: 01/12/2011] [Indexed: 10/18/2022]
Abstract
OBJECTIVES The study objectives were to check whether recommended vancomycin doses were related to pharmacological objectives for intensive care patients: steady-state plasma concentration (SSc) and ratio SSc/MIC (Minimal Inhibiting Concentration). The authors tried to identify variability factors for vancomycin plasmatic concentrations at peak. PATIENTS AND METHODS This monocentric, observational, and retrospective survey was performed on 66 intensive care patients treated by antibiotics including vancomycin, alone or in combination, as a curative treatment for a severe infection with Gram-positive bacteria. Vancomycin was dosed at 15mg/kg during the first hour, then 40 to 60mg/kg per 24hour. Vancomycin SSc and bacteria MIC were recorded. The SSc/MIC ratio was determined and was considered efficient when superior to 8. RESULTS Forty-two percent of vancomycin SSc were within the effectiveness rate. Twenty-three percent of SSc/MIC ratios were superior to 8. The rate of clinical recovery was 71 %. The length of antibiotherapy was identified as positively interacting with biological effectiveness, unlike severe sepsis, a factor of negative interaction on vancomycin SSc in this study. CONCLUSION Less than half of the SSc and less than a quarter of the SSc/MIC ratios were at effective rates in our study. Therefore, adequacy between dosage, administration, and monitoring should be reviewed.
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Affiliation(s)
- D Commandeur
- Fédération d'anesthésie-réanimation-urgences, hôpital d'instruction des armées Clermont-Tonnerre, BCRM de Brest, CC 41, 29240 Brest cedex 9, France.
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Healy B, Huynh S, Mullane N, O'Brien S, Iversen C, Lehner A, Stephan R, Parker C, Fanning S. Microarray-based comparative genomic indexing of the Cronobacter genus (Enterobacter sakazakii). Int J Food Microbiol 2009; 136:159-64. [DOI: 10.1016/j.ijfoodmicro.2009.07.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2009] [Revised: 06/09/2009] [Accepted: 07/03/2009] [Indexed: 10/20/2022]
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Abstract
The purpose of this study was to obtain preliminary data on pathological gambling rates within a metropolitan Chinese community to determine if more costly extensive epidemiological surveys were justified. Two thousand survey questionnaires were distributed to parents through children attending a local Chinese speaking school. A response rate of 27.4% was obtained. Over a quarter of respondents were born overseas in either Mainland China or Hong Kong. Results indicated that gambling was not a popular activity with 60.0% of respondents stating that they never gambled. Of those who gambled, a third of respondents identified lotto as the preferred form. Using a Chinese translation version of the SOGS and a cut-off score of 10, a prevalence estimate of 2.9% for pathological gambling was found with males showing a higher rate (4.3%) as compared to females (1.6%). Respondents reporting a prior history of gambling in their country of origin were more likely to be classified as probable pathological gamblers. Despite the use of a sample of convenience, changes to the wording of two items in the Chinese translation of the SOGS and the possibility of false positive cases in the present study, it is concluded that further research into problem gambling in this community should be undertaken.
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Affiliation(s)
- A. Blaszczynski
- Psychiatry Research & Teaching Unit, University of New South Wales, Liverpool Hospital, Liverpool NSW 2170, Australia
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Oulhaj H, Huynh S, Langris M, Barbey P, Bocquet J. Synthesis and distribution of rat Sertoli cell proteoglycans are modulated by linoleate and vitamin E. Biochem Mol Biol Int 1993; 31:305-14. [PMID: 8275018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
In rat Sertoli cells, linoleate addition modified cell membrane fatty acid composition and changes depended on linoleate concentrations. In presence of the lowest 18:2 n-6 concentrations (2.5 and 7.5 microM), decrease in proteoglycan synthesis paralleled increase in n-6 linoleate-derived metabolites. At high concentration (21 microM), linoleate accumulated in membranes and level of n-6 linoleate-derived metabolites returned to basal value, without change in proteoglycan synthesis. Linoleate modified proteoglycan distribution in Sertoli cells by an increase in peripheral proteoglycans and a concomitant decrease in medium proteoglycans. Vitamin E (100 microM) did not alter fatty acid composition in control and linoleate-treated cells, but enhanced proteoglycan production. Furthermore, this agent counteracted linoleate-induced modifications in proteoglycan cell distribution.
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Affiliation(s)
- H Oulhaj
- Departement de Chimie, Faculté des Sciences de Meknès, Maroc
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Abstract
1. The biosynthesis of polyunsaturated fatty acids (PUFA) of the n-6 and n-3 series was investigated in cultured Sertoli cells. 18:2n-6, 18:3n-6, 20:2n-6, 18:3n-3 and 20:3n-3 were added individually at a concentration of 20 mumol to culture media. 2. Maximum incorporation of 20- and 22-carbon PUFA into membrane lipids was observed after 72 hr of incubation with all the exogenous substrates used. 3. As reported in other cell systems, the delta 6 desaturation was the first rate-limiting step; the major factor regulating this activity was the concentration of linoleic acid or alpha-linolenic acid in the medium. 4. Our data show that the delta 5-desaturation represents a second regulatory step in PUFA biosynthesis. 5. The sum of n-6 and n-3 PUFA of the 22 carbon chain length constantly represented between 11 and 12% of total fatty acids, regardless of the exogenous substrate used. 6. Our kinetic studies of the incorporation of PUFA of the n-6 and n-3 series did not permit detection of a delta 8 desaturase activity.
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Affiliation(s)
- H Oulhaj
- Laboratoire de Biochimie, URA CNRS 609, Université de Caen, France
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Huynh S, Oulhaj H, Bocquet J, Nouvelot A. Metabolic utilization of linoleate and alpha-linolenate in cultured Sertoli cells. Comp Biochem Physiol B 1991; 99:265-70. [PMID: 1684926 DOI: 10.1016/0305-0491(91)90039-g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
1. The capacity of cultured Sertoli cells to synthesize long-chain polyunsatured fatty acids (PUFA) from the essential fatty acid (EFA) precursors 18:2 n-6 and 18:3 n-3 was tested, and the concentrations of each EFA required to obtain maximal incorporation into membrane lipids were determined. 2. The two EFA were added to the culture medium as free fatty acids complexed to albumin in a molar ratio of 12:1. 3. When the substrates were added individually, the maximal levels of biosynthesis were obtained with 0.7 micrograms/ml of 18:2 n-6 and 2 micrograms/ml of 18:3 n-3. 4. When the two EFA were added together, clear alterations in the behavior of the desaturases with regard to the n-6 and n-3 fatty acids were observed. 5. It was found that a concentration of 0.35 micrograms/ml of each EFA represented the "ideal" required level in order to ensure optimal incorporation of 22-carbon PUFA into the membrane lipids. 6. These results provide the first data on the definition of EFA requirements for Sertoli cells in culture.
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Affiliation(s)
- S Huynh
- Laboratoire de biochimie, URA CNRS 609, Université Caen, France
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Huynh CH, Huynh S, Jacquet J, Boivinet P. [Interaction of two isomers, N-nitrosomethylphenylamine, N-nitroso derivative, and p-nitrosomethylaniline with microorganisms]. C R Acad Hebd Seances Acad Sci D 1978; 286:233-6. [PMID: 417873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
There exists a relationship between the chemical structure C--NO or N--NO and biological effects. p-nitrosomethylaniline, a C-nitroso compound, in contrast to its isomer, N-nitrosomethylphenylamine, a N-nitroso derivate, shows a marked action against microoganisms and is, alone, reduced enzymatically.
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