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Aguilar-Muñoz P, Lavergne C, Chamy R, Cabrol L. The biotechnological potential of microbial communities from Antarctic soils and sediments: application to low temperature biogenic methane production. J Biotechnol 2022; 351:38-49. [DOI: 10.1016/j.jbiotec.2022.04.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 04/20/2022] [Accepted: 04/26/2022] [Indexed: 11/24/2022]
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Lavergne C, Hugoni M, Hubas C, Debroas D, Dupuy C, Agogué H. Diel Rhythm Does Not Shape the Vertical Distribution of Bacterial and Archaeal 16S rRNA Transcript Diversity in Intertidal Sediments: a Mesocosm Study. Microb Ecol 2018; 75:364-374. [PMID: 28779296 DOI: 10.1007/s00248-017-1048-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2017] [Accepted: 07/20/2017] [Indexed: 06/07/2023]
Abstract
In intertidal sediments, circadian oscillations (i.e., tidal and diel rhythms) and/or depth may affect prokaryotic activity. However, it is difficult to distinguish the effect of each single force on active community changes in these natural and complex intertidal ecosystems. Therefore, we developed a tidal mesocosm to control the tidal rhythm and test whether diel fluctuation or sediment depth influence active prokaryotes in the top 10 cm of sediment. Day- and nighttime emersions were compared as they are expected to display contrasting conditions through microphytobenthic activity in five different sediment layers. A multiple factor analysis revealed that bacterial and archaeal 16S ribosomal RNA (rRNA) transcript diversity assessed by pyrosequencing was similar between day and night emersions. Potentially active benthic Bacteria were highly diverse and influenced by chlorophyll a and phosphate concentrations. While in oxic and suboxic sediments, Thaumarchaeota Marine Group I (MGI) was the most active archaeal phylum, suggesting the importance of the nitrogen cycle in muddy sediments, in anoxic sediments, the mysterious archaeal C3 group dominated the community. This work highlighted that active prokaryotes organize themselves vertically within sediments independently of diel fluctuations suggesting adaptation to physicochemical-specific conditions associated with sediment depth.
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Affiliation(s)
- C Lavergne
- Université de La Rochelle - CNRS, UMR 7266, LIENSs, 2 rue Olympe de Gouges, 17000, La Rochelle, France.
- School of Biochemical Engineering, Pontificia Universidad Católica Valparaíso, Avenida Brasil, 2085, Valparaíso, Chile.
| | - M Hugoni
- CNRS, UMR5557 Ecologie Microbienne, Université Lyon 1, INRA, UMR1418, 69220, Villeurbanne Cedex, France
| | - C Hubas
- Muséum National d'Histoire Naturelle, UMR BOREA, Sorbonne Universités, UPMC Univ Paris 6, CNRS 7208, IRD 207, UCN, UA, Station de Biologie Marine, 29900, Concarneau, France
| | - D Debroas
- Clermont Université, Université Blaise Pascal, LMGE, BP 10448, 63000, Clermont-Ferrand, France
- CNRS, UMR 6023, LMGE, 63171, Aubière, France
| | - C Dupuy
- Université de La Rochelle - CNRS, UMR 7266, LIENSs, 2 rue Olympe de Gouges, 17000, La Rochelle, France
| | - H Agogué
- Université de La Rochelle - CNRS, UMR 7266, LIENSs, 2 rue Olympe de Gouges, 17000, La Rochelle, France
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Lobine D, Cummins I, Govinden-Soulange J, Ranghoo-Sanmukhiya M, Lindsey K, Chazot PL, Ambler CA, Grellscheid S, Sharples G, Lall N, Lambrechts IA, Lavergne C, Howes MJR. Medicinal Mascarene Aloes: An audit of their phytotherapeutic potential. Fitoterapia 2017; 124:120-126. [PMID: 29066297 DOI: 10.1016/j.fitote.2017.10.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 10/18/2017] [Accepted: 10/20/2017] [Indexed: 01/15/2023]
Abstract
A phytochemical and biological investigation of the endemic Mascarene Aloes (Aloe spp.), including A. tormentorii (Marais) L.E.Newton & G.D.Rowley, A. purpurea Lam, A. macra Haw., A. lomatophylloides Balf.f and A. vera (synonym A. barbadensis Mill.), which are used in the traditional folk medicine of the Mascarene Islands, was initiated. Methanolic extracts of the Aloes under study were analysed using high resolution LC-UV-MS/MS and compounds belonging to the class of anthraquinones, anthrones, chromones and flavone C-glycosides were detected. The Mascarene Aloes could be distinguished from A. vera by the absence of 2″-O-feruloylaloesin and 7-O-methylaloeresin. GC-MS analysis of monosaccharides revealed the presence of arabinose, fucose, xylose, mannose and galactose in all the Mascarene Aloes and in A. vera. The crude extracts of all Aloes analysed displayed antimicrobial activity against Bacillus cereus, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. Only extracts of A. macra were active against P. aeruginosa and Klebsiella pneumoniae, while none of the Aloe extracts inhibited Propionibacterium acnes. A. macra displayed anti-tyrosinase activity, exhibiting 50% inhibition at 0.95mg/mL, and extracts of A. purpurea (Mauritius) and A. vera displayed activity in a wound healing-scratch assay. In vitro cytotoxicity screening of crude methanolic extracts of the Aloes, using the MTT (3-(4, 5-dimethylthiazolyl-2)-2, 5-diphenyltetrazolium bromide) showed that only A. purpurea (Réunion) elicited a modest toxic effect against HL60 cells, with a percentage toxicity of 8.2% (A. purpurea-Réunion) and none of the Aloe extracts elicited a toxic effect against MRC 5 fibroblast cells at a concentration of 0.1mg/mL. Mascarene Aloe species possess noteworthy pharmacological attributes associated with their rich phytochemical profiles.
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Affiliation(s)
- D Lobine
- Faculty of Agriculture, University of Mauritius, Réduit, Mauritius; Department of Biosciences, Durham University, Durham DH1 3LE, UK
| | - I Cummins
- Department of Biosciences, Durham University, Durham DH1 3LE, UK
| | | | | | - K Lindsey
- Department of Biosciences, Durham University, Durham DH1 3LE, UK
| | - P L Chazot
- Department of Biosciences, Durham University, Durham DH1 3LE, UK
| | - C A Ambler
- Department of Biosciences, Durham University, Durham DH1 3LE, UK
| | - S Grellscheid
- Department of Biosciences, Durham University, Durham DH1 3LE, UK
| | - G Sharples
- Department of Biosciences, Durham University, Durham DH1 3LE, UK
| | - N Lall
- Department of Plant and Soil Science, Plant Science Complex, University of Pretoria, Pretoria 0002, South Africa
| | - I A Lambrechts
- Department of Plant and Soil Science, Plant Science Complex, University of Pretoria, Pretoria 0002, South Africa
| | - C Lavergne
- Conservatoire Botanique National de Mascarin, Centre Permanent d'Initiatives pour l'Environnement, Rue du Père Georges, Les Colimaçons, Saint-Leu, La Réunion, France
| | - M-J R Howes
- Natural Capital and Plant Health Department, Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey, UK
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Barbieri A, Cousson-Gélie F, Gourgou S, Lavergne C, Mollevi C. Étude longitudinale de la qualité de vie en oncologie par mélange de modèles mixtes. Rev Epidemiol Sante Publique 2016. [DOI: 10.1016/j.respe.2016.03.027] [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] Open
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Carraz M, Lavergne C, Jullian V, Wright M, Gairin JE, Gonzales de la Cruz M, Bourdy G. Antiproliferative activity and phenotypic modification induced by selected Peruvian medicinal plants on human hepatocellular carcinoma Hep3B cells. J Ethnopharmacol 2015; 166:185-199. [PMID: 25701751 DOI: 10.1016/j.jep.2015.02.028] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 02/06/2015] [Accepted: 02/10/2015] [Indexed: 06/04/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The high incidence of human hepatocellular carcinoma (HCC) in Peru and the wide use of medicinal plants in this country led us to study the activity against HCC cells in vitro of somes species used locally against liver and digestive disorders. MATERIALS AND METHODS Ethnopharmacological survey: Medicinal plant species with a strong convergence of use for liver and digestive diseases were collected fresh in the wild or on markets, in two places of Peru: Chiclayo (Lambayeque department, Chiclayo province) and Huaraz (Ancash department, Huaraz province). Altogether 51 species were collected and 61 ethanol extracts were prepared to be tested. Biological assessment: All extracts were first assessed against the HCC cell line Hep3B according a 3-step multi-parametric phenotypic assay. It included 1) the evaluation of phenotypic changes on cells by light microscopy, 2) the measurement of the antiproliferative activity and 3) the analysis of the cytoskeleton and mitosis by immunofluorescence. Best extracts were further assessed against other HCC cell lines HepG2, PLC/PRF/5 and SNU-182 and their toxicity measured in vitro on primary human hepatocytes. RESULTS Ethnopharmacological survey: Some of the species collected had a high reputation spreading over the surveyed locations for treating liver problems, i.e. Baccharis genistelloides, Bejaria aestuans, Centaurium pulchellum, Desmodium molliculum, Dipsacus fullonum, Equisetum bogotense, Gentianella spp., Krameria lapacea, Otholobium spp., Schkuhria pinnata, Taraxacum officinale. Hep3B evaluation: Fourteen extracts from 13 species (Achyrocline alata, Ambrosia arborescens, Baccharis latifolia, Hypericum laricifolium, Krameria lappacea, Niphidium crassifolium, Ophryosporus chilca, Orthrosanthus chimboracensis, Otholobium pubescens, Passiflora ligularis, Perezia coerulescens, Perezia multiflora and Schkuhria pinnata) showed a significant antiproliferative activity against Hep3B cells (IC50≤ 50µg/mL). This was associated with a lack of toxicity on primary human hepatocytes in vitro. Immunofluorescence experiments on Hep3B cells showed that crude extracts of Schkuhria pinnata and Orthrosanthus chimboracensis could block Hep3B cells in mitosis with an original phenotype. Crude extracts of Perezia coerulescens, Perezia multiflora, Achyrocline alata, Ophryosporus chilca, Otholobium pubescens and Hypericum laricifolium could modify the overall microtubule cytoskeletal dynamics of Hep3B cells in interphase by an original mechanism. CONCLUSIONS Our method allowed us to select 9 extracts which displayed antiproliferative activities associated with original cellular phenotypes on Hep3B cells, regarding known microtubule-targeting drugs. Both chemical and cellular studies are ongoing in order to elucidate natural compounds and cellular mechanisms responsible of the activities described.
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Affiliation(s)
- Maëlle Carraz
- Université de Toulouse; UPS; UMR 152 Pharma-DEV; Université Toulouse 3; Faculté, des Sciences Pharmaceutiques; 35 Chemin des Maraîchers, F-31062 Toulouse cedex 9, France; Institut de Recherche pour le Développement; IRD; UMR 152 Pharma-DEV, F-31062 Toulouse cedex 9, France.
| | - Cédric Lavergne
- Université de Toulouse; UPS; UMR 152 Pharma-DEV; Université Toulouse 3; Faculté, des Sciences Pharmaceutiques; 35 Chemin des Maraîchers, F-31062 Toulouse cedex 9, France
| | - Valérie Jullian
- Université de Toulouse; UPS; UMR 152 Pharma-DEV; Université Toulouse 3; Faculté, des Sciences Pharmaceutiques; 35 Chemin des Maraîchers, F-31062 Toulouse cedex 9, France; Institut de Recherche pour le Développement; IRD; UMR 152 Pharma-DEV, Mission IRD, Casilla 18-1209 Lima, Peru
| | - Michel Wright
- Université de Toulouse; UPS; UMR 152 Pharma-DEV; Université Toulouse 3; Faculté, des Sciences Pharmaceutiques; 35 Chemin des Maraîchers, F-31062 Toulouse cedex 9, France; Centre Nationalde la Recherche Scientifique; CNRS; UMR 152 Pharma-DEV; Faculté, des Sciences Pharmaceutiques; 35 Chemin des Maraîchers, F-31062 Toulouse cedex 9, France
| | - Jean Edouard Gairin
- Université de Toulouse; UPS; UMR 152 Pharma-DEV; Université Toulouse 3; Faculté, des Sciences Pharmaceutiques; 35 Chemin des Maraîchers, F-31062 Toulouse cedex 9, France
| | | | - Geneviève Bourdy
- Université de Toulouse; UPS; UMR 152 Pharma-DEV; Université Toulouse 3; Faculté, des Sciences Pharmaceutiques; 35 Chemin des Maraîchers, F-31062 Toulouse cedex 9, France; Institut de Recherche pour le Développement; IRD; UMR 152 Pharma-DEV, F-31062 Toulouse cedex 9, France
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Tami M, Barbieri A, Bry X, Azria D, Gourgou S, Mollevi C, Lavergne C. Estimation de modèles à équations structurelles par algorithme EM pour l’analyse longitudinale de la qualité de vie relative à la santé en cancérologie. Rev Epidemiol Sante Publique 2015. [DOI: 10.1016/j.respe.2015.03.027] [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: 10/23/2022] Open
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Greuner H, Böswirth B, Boscary J, Friedrich T, Lavergne C, Linsmeier C, Schlosser J, Wiltner A. Review of the high heat flux testing as an integrated part of W7-X divertor development. Fusion Engineering and Design 2009. [DOI: 10.1016/j.fusengdes.2008.12.083] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Tassin J, Triolo J, Lavergne C. Ornamental plant invasions in mountain forests of Réunion (Mascarene Archipelago): a status review and management directions. Afr J Ecol 2007. [DOI: 10.1111/j.1365-2028.2006.00748.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sender C, Dantras E, Dantras-Laffont L, Lacoste MH, Dandurand J, Mauzac M, Lacout JL, Lavergne C, Demont P, Bernès A, Lacabanne C. Dynamic mechanical properties of a biomimetic hydroxyapatite/polyamide 6,9 nanocomposite. J Biomed Mater Res B Appl Biomater 2007; 83:628-35. [PMID: 17806121 DOI: 10.1002/jbm.b.30930] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [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: 11/08/2022]
Abstract
A biomimetic composite of nanohydroxyapatite (nHap) and semicrystalline polyamide 6,9 (PA 6,9) was synthesized by thermally induced phase separation. The nHap powder was dispersed in a polymer matrix with a low ratio ranging 1-10 wt %. The mean size of the nHap, determined by scanning electron microscopy (SEM) was approximately 100-200 nm (length), 40-60 nm (width). Physicochemical analyses were performed in order to characterize the PA 6,9 and nHap separately on the one hand, and the PA 6,9/nHap composites on the other hand. Differential scanning calorimetry (DSC) and dynamic mechanical analyses (DMA) have pointed out an optimization of the composite physical properties as a function of nHap content till a limit value of 5 wt %. Above this value, the mechanical properties decreased. Four main parameters have been found to influence the composite physical properties improvement: the fillers content, the physical structure of the polymeric matrix, the particles dispersion and the physical interaction strength between organic and inorganic phases. The dynamic mechanical properties of this biomimetic nanocomposite were compared with human cortical bone.
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Affiliation(s)
- C Sender
- L2P, Institut CARNOT-CIRIMAT, Université Paul Sabatier, 31062 Toulouse, France
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12
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Guillem P, Lavergne C, Cans C. [How to calculate the completeness of ascertainment of a morbidity register? Example of the Isere childhood handicap register in Grenoble, France]. Rev Epidemiol Sante Publique 2000; 48:41-51. [PMID: 10740084] [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: 02/16/2023] Open
Abstract
BACKGROUND It should no longer be necessary to demonstrate the importance of knowing the completeness of ascertainment for a morbidity register, particularly with respect to the interpretation of prevalence rates and their trends, but also when using register data for etiological studies. METHOD The study covered 9 generations of children born between 1980 and 1988. All of these children lived in the Isère department in SouthEast France, and each of them had at least one major deficiency, according to the inclusion criteria laid down by the RHEOP ("Registre des Handicaps de l'Enfant et Observatoire Périnatal", in French, or Childhood Handicap Register and Perinatal Observatory). These children were recruited from four different data sources. The completeness of ascertainment of the register was estimated first by means of the capturerecapture method, based on two sources that were shown to be independent by the Wittes method. Following this, loglinear models were used. The advantage of this was the absence of restrictions involved in adhering to the necessary validity conditions before applying the capture-recapture method, and the possibility of introducing heterogeneity variables, such as the number of deficiencies per child, for example. RESULTS The applied capturerecapture method, with two main sources that have been found to be independent, gives an overall completeness of ascertainment of 86% CI(95%)[8291], with a variation of between 76% CI(95%)[6787] and 97% CI(95%)[93100] when the number of deficiencies per child is taken into account. After application of the loglinear models, the results obtained are very close to those obtained with the capture-recapture method, both in the case of estimation of the overall completeness of ascertainment and in the case of the completeness of ascertainment that is estimated according to the number of deficiencies variable. The similarity of the results obtained by the two methods appears to support our empirical study, but is only possible because of the validity of certain conditions (the interactions of the order of three were not significant) which can only be verified using statistical tests in the linear log models. CONCLUSION If the application conditions of the capture-recapture method are carefully adhered to, it becomes possible, without the help of software, to produce a correct estimate of the number of missing cases. Nevertheless, it would be unreasonable to continue using this method alone since log linear models have been found to be independent of these validity conditions.
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Affiliation(s)
- P Guillem
- RHEOP, 23 avenue Albert 1er de Belgique, 38000 Grenoble
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Abstract
To increase our understanding of the role of the Src homology 2 (SH2) domain-containing protein Shb in the mitogenic signal transduction, Shb mRNA contents were determined in the fibroblast-like NIH3T3 cells and the insulin producing beta TC-1 cells under various conditions. In NIH3T3 cells, the serine/ threonine phosphatase inhibitor okadaic acid and the tyrosine kinase inhibitor genistein increased Shb mRNA contents, the protein kinase C activating phorbol ester 12-O-tetradecanoyl 13-acetate (TPA) decreased the Shb mRNA content, whereas the tyrosine kinase inhibitor tyrphostin 25 and the mitogen platelet-derived growth factor (PDGF-BB) had no effect. In beta TC-1 cells, okadaic acid and genistein increased the Shb mRNA content, whereas tyrphostin 25 and serum were without effect. Okadaic acid and genistein decreased the rates of beta TC-1 cell DNA synthesis. It is concluded that expression of the SHB gene is under a complex mode of regulation involving at least three different protein kinases. As a consequence of this, it is likely that SHB gene expression is significantly modulated by conditions of specific activation of certain pathways, whereas its expression appears little influenced by serum and a mitogen.
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Affiliation(s)
- C Lavergne
- INSERM CJF 93-13, Hopital Robert Debré, Paris, France
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Karlsson T, Songyang Z, Landgren E, Lavergne C, Di Fiore PP, Anafi M, Pawson T, Cantley LC, Claesson-Welsh L, Welsh M. Molecular interactions of the Src homology 2 domain protein Shb with phosphotyrosine residues, tyrosine kinase receptors and Src homology 3 domain proteins. Oncogene 1995; 10:1475-83. [PMID: 7537362] [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: 01/25/2023]
Abstract
The molecular interactions of the Src homology 2 (SH2) domain and the N-terminal proline-rich sequence motifs (pro-1 to pro-5) of the SH2 protein Shb with other components were presently characterised. Using a degenerate phosphopeptide library the preferred binding site for the Shb SH2 domain was determined to pTyr-Thr/Val/Ile-X-Leu at positions +1 to +3 relative the phosphotyrosine residue. Experiments with competing peptides and platelet-derived growth factor (PDGF) beta-receptor mutants with Y to F substitutions in autophosphorylation sites revealed multiple binding sites for the Shb SH2 domain in the receptor. The Shb SH2 domain also binds to in vitro phosphorylated fibroblast growth factor receptor-1 (FGFR-1) mainly through position Y776. The receptor experiments suggest that other residues besides the +1 to +3 positions may also be of significance for Shb binding. The pro-4/pro-5 motif of Shb binds in vitro particularly well to the Src, p85 alpha PI3-kinase and Eps8 SH3 domains expressed as GST fusion proteins. However, the GST-SH3 domain fusion proteins tested bind in vitro to peptides corresponding to the pro-1 to pro-5 motifs of Shb with low affinity and selectivity, suggesting that sequences outside the core proline motif may also be important for Shb-SH3 domain interactions. In vivo association between Shb-SH3 domain proteins v-Src and Eps8 was detected by coimmunoprecipitation. PDGF treatment did not affect the association between Eps8 and Shb. The data suggest that Shb is an adaptor protein linking SH3 domain proteins to tyrosine kinases or other tyrosine phosphorylated proteins.
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Affiliation(s)
- T Karlsson
- Department of Medical Cell Biology, Uppsala University, Sweden
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Abstract
We studied the growth characteristics of the insulin-producing HIT cells. Although successful in many cell lines such as βTC1, growth arrest could not be obtained with HIT cells left for 3 days without serum. Cytofluorometric analysis showed that about 24% of the cells continuously exposed to serum peaked in the S phase. A similar proportion was found for cells cultured for 1 or 2 days in serum-free medium. A treatment with suramin, disrupting the binding of ligands from their receptors, was associated with a rapid and transient increase in c-fos and c-jun gene expression after suramin removal, in the absence of serum. In addition, HIT cells secrete mitogenic factors, different from IGF-I or IGF-II, acting on insulin-secreting βTC1 cells and on BP-A31 fibroblasts. Chromatography of the medium conditioned by the HIT cells on gel filtration gave two major mitogenic fractions, of hydrodynamic characteristics 33 000 and 3000-10 000. The activity was heat stable and bound to heparin. Comparative studies of the self-regulatory HIT cells, with the βTC1 cells requiring external growth factors, should contribute significantly to our understanding of the regulation of β cell growth.
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Affiliation(s)
- B Bréant
- INSERM U55, Hôpital Saint-Antoine, 184 rue du Faubourg Saint-Antoine, 75 571, Paris Cedex 12, France
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Welsh M, Mares J, Karlsson T, Lavergne C, Bréant B, Claesson-Welsh L. Shb is a ubiquitously expressed Src homology 2 protein. Oncogene 1994; 9:19-27. [PMID: 8302579] [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: 01/29/2023]
Abstract
To identify serum-inducible genes in the insulin-producing cell line beta TC-1, a library subtraction screening procedure was performed on serum-deprived (G0) and serum-restimulated (G1) insulin-producing beta TC-1 cells. A cDNA containing a motif with strong homology to Src homology 2 (SH2) domains was found using this procedure and called Shb. The Shb cDNA contains two methionine codons in its N-terminus and thus may code for two proteins of 67 and 56 kDa, each with one SH2 domain in its C-terminus. No other structural similarity to proteins with catalytic activity could be detected, suggesting that Shb is a so called adaptor. Shb contains the proline-rich sequence PPPGPGR between the two proposed initiator methionines which resembles a sequence for binding to Src homology 3 (SH3) domains. A second proline-rich sequence was detected after the second methionine codon. The Shb cDNA hybridized to a similar or identical mRNA of 3.1 kb expressed in mouse brain, liver, kidney, heart, NIH3T3 fibroblasts and beta TC-1 cells. Western blot analysis of the same tissues using an antiserum directed against a synthetic peptide corresponding to a part of the SH2 domain of Shb, revealed reactivity with two proteins of 56 and 67 kDa. In addition, a third reactive component of 40 kDa was detected in most tissues. Transfection and transient expression of the Shb cDNA in COS-1 cells yielded increased expression of the 67, 56 and 40 kDa proteins. Transfection and stable expression of the Shb cDNA in pig aortic endothelial cells showed increased expression primarily of the 67 kDa protein. A fusion protein consisting of the SH2 domain of Shb linked to glutathione S-transferase showed increased binding to glycoproteins of cells stimulated with platelet-derived growth factor (PDGF-BB). Furthermore, the autophosphorylated PDGF beta-receptor but not the autophosphorylated epidermal growth factor (EGF) receptor bound specifically to immobilized fusion protein. It is concluded that Shb is a novel SH2-containing protein with proline-rich domains and therefore probably involved in the signal-transduction of some ligand-activated tyrosine kinase receptors.
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Affiliation(s)
- M Welsh
- Department of Medical Cell Biology, Uppsala University, Sweden
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Antoniadis A, Lavergne C. An estimating function for a scalar parameter in a covariance operator. Statistics & Risk Modeling 1994. [DOI: 10.1524/strm.1994.12.1.53] [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: 11/24/2022]
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Cans C, Cohen O, Lavergne C, Mermet MA, Demongeot J, Jalbert P. Logistic regression model to estimate the risk of unbalanced offspring in reciprocal translocations. Hum Genet 1993; 92:598-604. [PMID: 8262520 DOI: 10.1007/bf00420946] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The aim of this study was to estimate the risk of viable unbalanced offspring for a parental carrier of reciprocal translocation. On a large computerized database of reciprocal translocations we used logistic regression to model this risk. The status of the progeny is the outcome variable. Explanatory covariates are cytogenetic characteristics of the translocation, age and sex of the parental carrier, and potential viability of the gametes. The results obtained by the logistic model demonstrate the important role of certain variables such as the sex of the parental carrier and the R band length of the translocated segments. Within the group of lower risk (risk of viable unbalanced offspring less than 5%), 97% of the individuals are correctly classified with this model. For this group, the choice prenatal diagnosis can be best discussed by considering both the risk for viable unbalanced offspring and the risk of induced abortion following prenatal diagnosis.
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Affiliation(s)
- C Cans
- Genetics Laboratory, Medical School, Joseph Fourier University Grenoble, La Tronche, France
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Lavergne C, Breant B, Rosselin G. Modulation of growth-related gene expression and growth inhibition by cyclic adenosine 3',5'-monophosphate-elevating agents in the insulin-producing cell line beta TC1. Endocrinology 1992; 131:2351-6. [PMID: 1385100 DOI: 10.1210/endo.131.5.1385100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We studied the involvement of the cAMP pathway in the regulation of beta TC1 cell growth with the phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine (IBMX) and the activator of adenylate cyclase forskolin. We examined the effect of the increase in cAMP content on the serum-induced resumption of the cell cycle of quiescent cells. IBMX and forskolin both inhibited the mitogenic effect of serum in a concentration-dependent manner. Intracellular cAMP levels were, respectively, enhanced 3.0- and 8.6-fold by IBMX (0.5 mM) and forskolin (20 microM) within 1 h. IBMX and forskolin were also inducers of insulin release, indicating that the growth-arrested beta TC1 cells have retained the essential characteristics of the normal differentiated beta-cells. The effects of IBMX and forskolin were correlated with a modulation of cell cycle-related gene expression. IBMX induced expression of the c-fos gene, which was further enhanced by the simultaneous addition of serum, whereas forskolin alone elicited maximal induction of this gene. Interestingly, c-jun expression was only enhanced with forskolin. We also studied the effects of IBMX and forskolin on the expression of the simian virus-40 T-antigen controlled by the rat insulin II promoter in beta TC1 cells. IBMX and forskolin inhibited the serum-induced accumulation of simian virus-40 T-antigen mRNA in quiescent as well as exponentially growing beta TC1 cells.
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Affiliation(s)
- C Lavergne
- Unité INSERM 55, Hôpital Saint-Antoine, Paris, France
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Bréant B, Lavergne C, Astesano A, Ferrand N, Asfari M, Boissard C, Anteunis A, Rosselin G. Development of the beta cells. Mt Sinai J Med 1992; 59:175-85. [PMID: 1574074] [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: 12/27/2022]
Affiliation(s)
- B Bréant
- Institut National de La Santé et de La Recherche Médicale, Unité de Recherches sur Les Peptides Neurodigestifs et Le Diabète, Unite 55, Paris
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Bonneu M, Lavergne C. Bootstrap and Asymptotic Prediction Criterion Estimates for Binomial Proportions in Insemination Data. Biom J 1992. [DOI: 10.1002/bimj.4710340107] [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: 11/06/2022]
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Abstract
The pancreatic cell line beta TC1, established from insulinomas of transgenic mice carrying a hybrid insulin-promoted large T antigen gene, has retained several characteristics of normal cells, including the insulin content and inducibility of insulin secreting by glucose. We show here that the growth of beta TC1 cells is arrested in low serum-concentration medium. Cells exposed for three days to 0.25% fetal calf serum ceased to incorporate [3H]thymidine but were still able to resume the cell division cycle upon addition of serum. In this cell line, we have determined by cytofluorometry the cell cycle kinetic parameters to be of 21 h, 10 h 30 min and 12 h for the G1, S and G2/M phases, respectively. Quiescent beta TC1 cells constitutively expressed the protooncogene c-jun that codes for the transcriptional factor AP1, as well as cdc2, another cell cycle-related gene. A large transient increase in the expression of the c-fos gene was obtained rapidly, 30 min after addition of serum and a similar increase in c-jun expression after one hour. Expression of the cdc2 gene was also enhanced to a lesser extent. The same effects were also observed in the presence of cycloheximide, thus proving that the expression of these three genes is directly stimulated by serum growth factors. Consequently, quiescent beta TC1 cells provide a good model for studying the short- and long-term effects of growth factors on Beta-cell proliferation.
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Affiliation(s)
- B Bréant
- Unité INSERM 55, Hôpital Saint-Antoine, Paris, France
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