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Julien M, Yann B, Philippe LF, Engin Y. 208 Assessment of teamwork by self-employed health professionals in the management of type 2 diabetes patients: the ASALEE project. BMJ Qual Saf 2010. [DOI: 10.1136/qshc.2010.041624.83] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Julien M. Plant biology and other issues that relate to the management of water hyacinth: a global perspective with focus on Europe1. ACTA ACUST UNITED AC 2008. [DOI: 10.1111/j.1365-2338.2008.01267.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Taksin L, Mallick S, Frachet O, Julien M, Lepennec V, Ficheux M, Bensadoun H. [Mycotic aneurysm and renal transplant. A case report]. Prog Urol 2008; 19:149-52. [PMID: 19168023 DOI: 10.1016/j.purol.2008.10.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2008] [Revised: 10/07/2008] [Accepted: 10/20/2008] [Indexed: 12/27/2022]
Abstract
The arterial aneurysm secondary to Candida is a rare but frightening complication of renal transplant. We report the case of a 58-year-old patient who developed an arterial aneurysm secondary to a Candida infection in 3 weeks of a third renal transplant. Candida albicans was isolated from the preservation solution. The treatment consisted of a transplant nephrectomy, aneurysm excision and an iliac bypass with cryopreserved iliac homograft. All of bacteriologic culture was positive for Candida. The positive bacteriologic culture for Candida in preservation solution requires antifongic treatment. In case of arterial aneurysm, a surgical treatment is necessary but majority of kidney transplant had to be removed.
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Chautard J, Julien M. [Ruptured infra-renal abdominal aortic aneurysm]. JOURNAL DE CHIRURGIE 2006; 143:173-7. [PMID: 16888604 DOI: 10.1016/s0021-7697(06)73647-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
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Ancelle-Park R, Seradour B, Patty A, Julien M, Bloch J. Results of the new french breast cancer screening programme for year 2003. EJC Suppl 2006. [DOI: 10.1016/s1359-6349(06)80062-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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31
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Gadoury MA, Schwartzman K, Rouleau M, Maltais F, Julien M, Beaupré A, Renzi P, Bégin R, Nault D, Bourbeau J. Self-management reduces both short- and long-term hospitalisation in COPD. Eur Respir J 2005; 26:853-7. [PMID: 16264046 DOI: 10.1183/09031936.05.00093204] [Citation(s) in RCA: 138] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The aim of the present study was to assess the long-term impact on hospitalisation of a self-management programme for chronic obstructive pulmonary disease (COPD) patients. A multicentre, randomised clinical trial was carried out involving 191 COPD patients from seven hospitals. Patients who had one or more hospitalisations in the year preceding study enrolment were assigned to a self-management programme "Living Well with COPD(TM)" or to standard care. Hospitalisations from all causes were the primary outcome and were documented from the provincial hospitalisation database; emergency visits were recorded from the provincial health insurance database. Most patients were elderly, not highly educated, had advanced COPD (reflected by a mean forced expiratory volume in one second of 1 L), and almost half reported a dyspnoea score of 5/5 (modified Medical Research Council). At 2 years, there was a statistically significant and clinically relevant reduction in all-cause hospitalisations of 26.9% and in all-cause emergency visits of 21.1% in the intervention group as compared to the standard-care group. After adjustment for the self-management intervention effect, the predictive factors for reduced hospitalisations included younger age, sex (female), higher education, increased health status and exercise capacity. In conclusion, in this study, patients with chronic obstructive pulmonary disease who received educational intervention with supervision and support based on disease-specific self-management maintained a significant reduction in hospitalisations after a 2-year period.
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Laurin C, Lavoie KL, Bacon S, Stébenne PR, Dupuis G, Cartier A, Lacoste G, Julien M, Labrecque M. SEX DIFFERENCES IN THE PREVALENCE OF PSYCHIATRIC DISORDERS AND PSYCHOLOGICAL DISTRESS IN PATIENTS WITH CHRONIC OBSTRUCTIVE PULMONARY DISEASE IN A CANADIAN SAMPLE. Chest 2005. [DOI: 10.1378/chest.128.4_meetingabstracts.265s-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Magne D, Julien M, Vinatier C, Merhi-Soussi F, Weiss P, Guicheux J. Cartilage formation in growth plate and arteries: from physiology to pathology. Bioessays 2005; 27:708-16. [PMID: 15954094 DOI: 10.1002/bies.20254] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Vascular calcifications are the consequence of several pathological conditions such as atherosclerosis, diabetes, hypercholesterolemia and chronic renal insufficiency. They are associated with risks of amputation, ischemic heart disease, stroke and increased mortality. A growing body of evidence indicates that vascular smooth muscle cells (VSMCs) undergo chondrogenic commitment eventually leading to vascular calcification, by mechanisms similar to those governing ossification in the cartilage growth plate. Our knowledge of the formation of cartilage growth plate can therefore help us to understand why and how arteries calcify and, consequently, develop new therapeutic strategies. Reciprocally, thorough consideration of the events leading to ectopic chondrocyte differentiation appears crucial to further increase our understanding of growth plate formation. In this context, we will review the effects of known or suspected factors that promote chondrogenic differentiation in growth plate and arteries.
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Varandas L, Julien M, Gomes A, Rodrigues P, Van Lerberghe W, Malveiro F, Aguiar P, Kolsteren P, Van Der Stuyft P, Hilderbrand K, Labadarios D, Ferrinho P. A randomised, double-blind, placebo-controlled clinical trial of vitamin A in severe malaria in hospitalised Mozambican children. ANNALS OF TROPICAL PAEDIATRICS 2001; 21:211-22. [PMID: 11579859 DOI: 10.1080/02724930120077781] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
This paper reports a randomised, double-blind, placebo-controlled clinical trial of the effect of routine vitamin A supplementation given on admission to children with severe malaria with regard to survival, recovery during hospitalisation and outcome 6 weeks after discharge. Children aged between 6 and 72 months admitted to the paediatric wards of the Central Hospital of Maputo (CHM), Mozambique with a diagnosis of severe malaria were randomly assigned either to a control group (placebo) or an experimental group (vitamin A) and were followed up 6 weeks after discharge. There were 280 children in the experimental and 290 in the placebo group. Seven (2.5%) and 13 (4.5%) children died in the experimental and the placebo groups, respectively, a relative risk of death of 0.56 (95% CI 0.23-1.38, p = 0.201). During the 1st 5 hours of admission, the relative risk of death in the vitamin A-supplemented group was 2.54 (0.50-12.96); after 5 hours of admission it was 0.19 (95% CI 0.04-0.85; p = 0.015). In the supplemented group, 4/82 (4.9%) of the children developed neurological sequelae vs 2/78 (2.6%) in the placebo group (RR = 1.90; 95% CI 0.36-10.09; p = 0.682). Although the overall reduction in the risk of death observed for all children receiving vitamin A is not statistically significant, it might be clinically important. This finding cannot, however, be accepted as a firm conclusion and requires validation by future trials.
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Daoud R, Julien M, Gros P, Georges E. Major photoaffinity drug binding sites in multidrug resistance protein 1 (MRP1) are within transmembrane domains 10-11 and 16-17. J Biol Chem 2001; 276:12324-30. [PMID: 11152467 DOI: 10.1074/jbc.m009782200] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
MRP1 is an ABC (or ATP binding cassette) membrane transport protein shown to confer resistance to structurally dissimilar drugs. Studies of MRP1 topology suggested the presence of a hydrophobic N-domain with five potential membrane-spanning domains linked to an MDR1-like core (MSD1-NBD1-L1-MSD2-NBD2) by an intracellular linker domain (L0). MRP1-mediated multidrug resistance is thought to be due to enhanced drug efflux. However, little is known about MRP1-drug interaction and its drug binding site(s). We previously developed several photoreactive probes to study MRP1-drug interactions. In this report, we have used eight MRP1-HA variants that were modified to have hemagglutinin A (HA) epitopes inserted at different sites in MRP1 sequence. Exhaustive in-gel digestion of all IAARh123 photoaffinity-labeled MRP1-HA variants revealed the same profile of photolabeled peptides as seen for wild type MRP1. Photolabeling of the different MRP1-HA variants followed by digestion with increasing concentrations of trypsin or Staphylococcus aureus V8 protease (1:800 to 1:5 w/w) and immunoprecipitation with anti-HA mAb identified two small photolabeled peptides ( approximately 6-7 kDa) from MRP1-HA(574) and MRP1-HA(1222). Based on the location of the HA epitopes in the latter variants together with molecular masses of the two peptides, the photolabeled amino acid residues were localized to MRP1 sequences encoding transmembranes 10 and 11 of MSD1 (Ser(542)-Arg(593)) and transmembranes 16 and 17 of MSD2 (Cys(1205)-Glu(1253)). Interestingly, the same sequences in MRP1 were also photolabeled with a structurally different photoreactive drug, IACI, confirming the significance of transmembranes 10, 11, 16 and 17 in MRP1 drug binding. Taken together, the results in this study provide the first delineation of the drug binding site(s) of MRP1. Furthermore, our findings suggest the presence of common drug binding site(s) for structurally dissimilar drugs.
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Varandas L, Julien M, Van Lerberghe W, Goncalves L, Ferrinho P. Independent indicators of outcome in severe paediatric malaria: maternal education, acidotic breathing and convulsions on admission. ANNALS OF TROPICAL PAEDIATRICS 2000; 20:265-71. [PMID: 11219163 DOI: 10.1080/1465328002003852] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Severe malaria is an important cause of death in hospitalized children in Mozambique, but the risk factors for this remain unclear. The objectives of the study were to define simple clinical criteria to identify on admission the children most at risk of dying. We studied prospectively 559 children admitted with severe malaria to the Department of Paediatrics of the Central Hospital of Maputo, Mozambique between March 1995 and August 1996. The case fatality rate was 3.6%. In a multiple logistic regression model, mothers' education (RR = 9.6, 95% CI 1.2-76.0), acidotic breathing (RR = 4.3, 95% CI 1.3-13.8) and convulsions in the emergency room (RR = 8.1, 95% CI 2.6-25.1) were associated with outcome. Together they predicted 97% of outcomes but only 33.3% of deaths.
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Urbatsch IL, Julien M, Carrier I, Rousseau ME, Cayrol R, Gros P. Mutational analysis of conserved carboxylate residues in the nucleotide binding sites of P-glycoprotein. Biochemistry 2000; 39:14138-49. [PMID: 11087362 DOI: 10.1021/bi001128w] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mutagenesis was used to investigate the functional role of six pairs of aspartate and glutamate residues (D450/D1093, E482/E1125, E552/E1197, D558/D1203, D592/D1237, and E604/E1249) that are highly conserved in the nucleotide binding sites of P-glycoprotein (Mdr3) and of other ABC transporters. Removal of the charge in E552Q/E1197Q and D558N/D1203N produced proteins with severely impaired biological activity when the proteins were analyzed in yeast cells for cellular resistance to FK506 and restoration of mating in a ste6Delta mutant. Mutations at other acidic residues had no apparent effect in the same assays. These four mutants were expressed in Pichia pastoris, purified to homogeneity, and biochemically characterized with respect to ATPase activity. Studies with purified proteins showed that mutants D558N and D1203N retained 14 and 30% of the drug-stimulated ATPase activity of wild-type (WT) Mdr3, respectively, and vanadate trapping of 8-azido[alpha-(32)P]nucleotide confirmed slower basal and drug-stimulated 8-azido-ATP hydrolysis compared to that for WT Mdr3. The E552Q and E1197Q mutants showed no drug-stimulated ATPase activity. Surprisingly, drugs did stimulate vanadate trapping of 8-azido[alpha-(32)P]nucleotide in E552Q and E1197Q at a level similar to that of WT Mdr3. This suggests that formation of the catalytic transition state can occur in these mutants, and that the bond between the beta- and gamma-phosphates is hydrolyzed. In addition, photolabeling by 8-azido[alpha-(32)P]nucleotide in the presence or absence of drug was also detected in the absence of vanadate in these mutants. These results suggest that steps after the transition state, possibly involved in release of MgADP, are severely impaired in these mutant enzymes.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B/genetics
- ATP Binding Cassette Transporter, Subfamily B/metabolism
- ATP Binding Cassette Transporter, Subfamily B/physiology
- ATP Binding Cassette Transporter, Subfamily B, Member 1/biosynthesis
- ATP Binding Cassette Transporter, Subfamily B, Member 1/genetics
- ATP Binding Cassette Transporter, Subfamily B, Member 1/isolation & purification
- ATP Binding Cassette Transporter, Subfamily B, Member 1/metabolism
- ATP-Binding Cassette Transporters/genetics
- ATP-Binding Cassette Transporters/metabolism
- ATP-Binding Cassette Transporters/physiology
- Adenosine Triphosphate/analogs & derivatives
- Adenosine Triphosphate/metabolism
- Amino Acid Sequence
- Amino Acid Substitution/genetics
- Animals
- Azides/metabolism
- Binding Sites/genetics
- Carboxylic Acids/metabolism
- Conserved Sequence
- DNA Mutational Analysis
- Drug Resistance, Multiple
- Genetic Vectors/metabolism
- Mice
- Molecular Sequence Data
- Mutagenesis, Site-Directed
- Oligonucleotides/metabolism
- Photoaffinity Labels/metabolism
- Pichia/genetics
- Pichia/metabolism
- Vanadates/metabolism
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Julien M, Gros P. Nucleotide-induced conformational changes in P-glycoprotein and in nucleotide binding site mutants monitored by trypsin sensitivity. Biochemistry 2000; 39:4559-68. [PMID: 10758006 DOI: 10.1021/bi992744z] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Limited trypsin digestion was used to monitor nucleotide-induced conformational changes in wild-type P-glycoprotein (Pgp) as well as in nucleotide binding domain (NBD) Pgp mutants. Purified and reconstituted wild-type or mutant mouse Mdr3 Pgps were preincubated with different hydrolyzable or nonhydrolyzable nucleotides, followed by limited proteolytic cleavage at different trypsin:protein ratios. The Pgp tryptic digestion products were separated by SDS-PAGE followed by immunodetection with the mouse monoclonal anti-Pgp antibody C219, which recognizes a conserved epitope (VVQE/AALD) in each half of the protein. Different trypsin digestion patterns were observed for wild-type Pgp incubated with MgCl(2) alone, MgADP, MgAMP.PNP, MgATP, and MgATP + vanadate. A unique trypsin digestion profile suggestive of enhanced resistance to trypsin was observed under conditions of vanadate-induced trapping of nucleotides (MgATP + vanadate). The trypsin sensitivity profiles of Pgp mutants bearing either single or double mutations in Walker A (K429R, K1072R) and Walker B (D551N, D1196N) sequence signatures of NBD1 and NBD2 were analyzed under conditions of vanadate-induced trapping of nucleotides. The proteolytic cleavage pattern observed for the double mutants K429R/K1072R and D551N/D1196N, and for the single mutants K429R, K1072R, and D1196N were similar and clearly distinct from wild-type Pgp under the same conditions. This is consistent with the absence of ATP hydrolysis and of vanadate-induced trapping of 8-azido-ADP previously reported for these mutants [Urbatsch et al. (1998) Biochemistry 37, 4592-4602]. Interestingly, the trypsin digestion profiles observed under vanadate-induced trapping for the D551N and D1196N mutants were quite different, with the D551N mutant showing a profile resembling that seen for wild-type Pgp. The different sensitivity profiles of Pgp mutants bearing mutations at the homologous residue in NBD1 (D551N) and NBD2 (D1196N) suggest possible structural and functional differences between the two sites.
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Julien M, Feher T, Horvatic M, Berthier C, Bakharev ON, Segransan P, Collin G, Marucco J. 63Cu NMR evidence for enhanced antiferromagnetic correlations around Zn impurities in YBa2Cu3O6.7. PHYSICAL REVIEW LETTERS 2000; 84:3422-3425. [PMID: 11019105 DOI: 10.1103/physrevlett.84.3422] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/1999] [Indexed: 05/23/2023]
Abstract
Doping the high- T(c) superconductor YBa2Cu3O6.7 with 1.5% of nonmagnetic Zn impurities in CuO2 planes is shown to produce a considerable broadening of 63Cu NMR spectra, as well as an increase of low-energy magnetic fluctuations detected in 63Cu spin-lattice relaxation measurements. A model-independent analysis demonstrates that these effects are due to the development of staggered magnetic moments on many Cu sites around each Zn and that the Zn-induced moment in the bulk susceptibility might be explained by this staggered magnetization. Several implications of these enhanced antiferromagnetic correlations are discussed.
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Julien M. Nutrition: its role in dental training and practice. JOURNAL (CANADIAN DENTAL ASSOCIATION) 2000; 66:97-9. [PMID: 10730009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
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Julien M, Kajiji S, Kaback RH, Gros P. Simple purification of highly active biotinylated P-glycoprotein: enantiomer-specific modulation of drug-stimulated ATPase activity. Biochemistry 2000; 39:75-85. [PMID: 10625481 DOI: 10.1021/bi991726e] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A simplified method for the expression and purification of P-glycoprotein (Pgp) is presented. This method is based on the in-frame fusion of both a polyhistidine tail and a 100-amino acid residue biotin acceptor domain of oxaloacetate decarboxylase from Klebsiella pneumoniae at the carboxyl terminus end of Pgp (Pgp-H6BD). The expression/purification protocol for Pgp-H6BD involves high-level expression of the fusion protein in the yeast Pichia pastoris, biotinylation in vitro with biotin ligase, solubilization of crude membrane fractions in detergent, and affinity purification by a combination of nickel and avidin chromatography. Biotinylated Pgp binds to immobilized monomeric avidin and can be eluted with free biotin in a high state of purity. This protocol is rapid and efficient and yields purified Pgp which shows robust ATPase activity, as determined by vanadate-induced trapping of photoactive nucleotides and by direct measurement of ATP hydrolysis by Pgp-H6BD. This method should be useful for structural studies of the protein by spectroscopic or crystallographic approaches. This purified Pgp-H6BD preparation has been used to study the enantiomer-specific effects of inhibitors of Pgp-mediated drug transport on the drug-stimulated ATPase activity of the protein. A series of 1, 4-disubstituted piperazine derivatives with a central chiral carbon and modified at the head and tail groups are shown to stimulate Pgp ATPase activity in a dose-dependent fashion. Some of these compounds are also capable of inhibiting either vinblastine or verapamil stimulation of ATPase activity of Pgp in an enantiomer-specific fashion. The enantiomeric specific inhibitory activity of these compounds suggests complex interactions at a single substrate binding site(s) on Pgp.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B/biosynthesis
- ATP Binding Cassette Transporter, Subfamily B/genetics
- ATP Binding Cassette Transporter, Subfamily B/metabolism
- ATP Binding Cassette Transporter, Subfamily B, Member 1/antagonists & inhibitors
- ATP Binding Cassette Transporter, Subfamily B, Member 1/genetics
- ATP Binding Cassette Transporter, Subfamily B, Member 1/isolation & purification
- ATP Binding Cassette Transporter, Subfamily B, Member 1/metabolism
- ATP-Binding Cassette Transporters/biosynthesis
- ATP-Binding Cassette Transporters/genetics
- ATP-Binding Cassette Transporters/metabolism
- Adenosine Triphosphatases/antagonists & inhibitors
- Adenosine Triphosphatases/genetics
- Adenosine Triphosphatases/isolation & purification
- Adenosine Triphosphatases/metabolism
- Animals
- Biotinylation
- Drug Resistance, Multiple
- Enzyme Activators/pharmacology
- Histidine
- Humans
- Klebsiella pneumoniae/genetics
- Mice
- Peptides/genetics
- Pichia/genetics
- Piperazines/pharmacology
- Quinolines/pharmacology
- Recombinant Fusion Proteins/biosynthesis
- Recombinant Fusion Proteins/isolation & purification
- Recombinant Fusion Proteins/metabolism
- Stereoisomerism
- Thiazoles/pharmacology
- Tumor Cells, Cultured
- Verapamil/pharmacology
- Vinblastine/pharmacology
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Paulin-Levasseur M, Julien M. Characterization of the 2A7 antigen as a 85-kDa human nucleocytoplasmic shuttling protein. Exp Cell Res 1999; 250:439-51. [PMID: 10413598 DOI: 10.1006/excr.1999.4523] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The murine monoclonal antibody 2A7 was found to react specifically with a 85-kDa human protein which is distributed throughout the nuclear interior in interphase and becomes associated with condensed chromosomes during mitosis. The 2A7 epitope was not detected in cells from other species. Two-dimensional immunoblotting analysis of HeLa cell homogenates further indicated that the 85-kDa polypeptide species recognized by the 2A7 antibody corresponds to an acidic protein which may be complexed in vivo within high-molecular-weight protein structures. Immunofluorescence monitoring of the 2A7 staining pattern during in situ preparation of nuclear matrices from HeLa cells demonstrated that the nucleoplasmic fraction of the antigen is readily solubilized by detergent and salts, whereas the nucleolar fraction resists detergent/salt extraction and DNase digestion, to be released only upon RNase activity. Mobility assays in human-mouse heterokaryons provided evidence that the 2A7 antigen is a nucleocytoplasmic shuttling protein. The nuclear distribution of this antigen remained unchanged upon drug-induced inhibition of RNA synthesis but was markedly altered by heat shock stress. All together, the data presented here suggest that the 2A7 antigen may have a function in RNA metabolism.
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Julien M, Verrier B, Cerutti M, Chappe V, Gola M, Devauchelle G, Becq F. Cystic fibrosis transmembrane conductance regulator (CFTR) confers glibenclamide sensitivity to outwardly rectifying chloride channel (ORCC) in Hi-5 insect cells. J Membr Biol 1999; 168:229-39. [PMID: 10191357 DOI: 10.1007/s002329900512] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Increasing evidence is now accumulating for the involvement of the cystic fibrosis transmembrane conductance regulator (CFTR) in the control of the outwardly rectifying chloride channel (ORCC). We have examined the sensitivity of ORCC to the sulfonylurea drug glibenclamide in Hi-5 (Trichoplusia ni) insect cells infected with recombinant baculovirus expressing either wild-type CFTR, DeltaF508-CFTR or E. coli beta galactosidase cDNA and in control cells either infected with virus alone or uninfected. Iodide efflux and single channel patch-clamp experiments confirmed that forskolin and 1-methyl-3-isobutyl xanthine (IBMX) or 7-methyl-1,3 dipropyl xanthine (DPMX) activate CFTR channels (unitary conductance: 9.1 +/- 1.6 pS) only in cells expressing CFTR. In contrast, we identified 4-acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic acid (SITS)-sensitive ORCC in excised membrane patches in any of the cells studied, with similar conductance (22 +/- 2.5 pS at -80 mV; 55 +/- 4.1 pS at +80 mV) and properties. In the presence of 500 microm SITS, channel open probability (Po) of ORCC was reversibly reduced to 0.05 +/- 0.01 in CFTR-cells, to 0.07 +/- 0.02 in non-CFTR expressing cells and to 0.05 +/- 0.02 in DeltaF508-cells. In Hi-5 cells that did not express CFTR, glibenclamide failed to inhibit ORCC activity even at high concentrations (100 microm), whereas 500 microm SITS reversibly inhibited ORCC. In contrast in cells expressing CFTR or DeltaF508, glibenclamide dose dependently (IC50 = 17 microm, Hill coefficient 1.2) and reversibly inhibited ORCC. Cytoplasmic application of 100 microm glibenclamide reversibly reduced Po from 0.88 +/- 0.03 to 0.09 +/- 0.02 (wash: Po = 0.85 +/- 0.1) in CFTR cells and from 0.89 +/- 0.05 to 0.08 +/- 0.05 (wash: Po = 0.87 +/- 0.1) in DeltaF508 cells. In non-CFTR expressing cells, glibenclamide (100 microm) was without effect on Po (control: Po = 0. 89 +/- 0.09, glib.: Po = 0.86 +/- 0.02; wash: Po = 0.87 +/- 0.05). These data strongly suggest that the expression of CFTR confers glibenclamide sensitivity to the ORCC in Hi-5 cells.
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Guérin N, Urtasun A, Chauveau E, Julien M, Lebreton M, Dumon M. [Lingual thyroid and intra-lingual thyroglossal cyst. Apropos of 2 cases]. REVUE DE LARYNGOLOGIE - OTOLOGIE - RHINOLOGIE 1998; 118:183-8. [PMID: 9637108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Lingual thyroid and intra lingual thyro-glossal cyst are two benign tumours of similar embryological pathogenesis respectively with the arrest in the ectopic position of the thyroid gland during its downward migration and from abnormal persistence of the thyro-glossal tract for the cyst. The occurrence of lingual thyroid is rare 1/100,000 patients and outnumbers the incidence of intra-lingual cyst which represents an estimated 2.1% of the thyro-glossal cysts or fistulas. Both lesions are a rare cause of dysphagia and dyspnoea due to oropharyngeal obstruction, and radionuclide scintigraphy combined with CT and/or MRI will establish the diagnosis. Surgical pharyngotomy with an infra-hyoid approach provides excellent access to the lesions and complete removal of the tumours.
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Julien M, Millot C, Tocanne JF, Tournier JF. 12-O-tetradecanoylphorbol-13-acetate inhibits aminophospholipid translocase activity and modifies the lateral motions of fluorescent phospholipid analogs in the plasma membrane of bovine aortic endothelial cells. Exp Cell Res 1997; 234:125-31. [PMID: 9223377 DOI: 10.1006/excr.1997.3592] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The tumor promoter 12-O-tetradecanoylphorbol-13-acetate (TPA) is a potent mitogenic factor which can replace the growth promoting activity of basic fibroblast growth factor (bFGF) on bovine aortic endothelial cells. However, TPA-treated cells lose their strict contact inhibition at confluence, which is a characteristic of cells grown in the presence of bFGF. We have examined whether these changes could be related to modifications of the transbilayer and lateral motions of fluorescent lipids, namely 1-acyl-2-[6-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino]caproyl]-p hosphatidylcholine (C6-NBD-PC), -phosphatidylserine (C6-NBD-PS), and -phosphatidylethanolamine (C6-NBD-PE) inserted in the outer leaflet of the cell plasma membrane. In TPA-treated cells, the three fluorescent phospholipids remained located in the outer leaflet for at least 1 h at 20 degrees C after their insertion, indicating a blockade of the aminophospholipid translocase activity which is normally present in the plasma membrane of bFGF-treated cells. TPA also induced a large increase in the percentage of C6-NBD-PC and C6-NBD-PE probes which were free to diffuse laterally. The mobile fractions M reached values of approximately 100% for the two lipids, while for bFGF-treated cells they were found around 85 and 75%, respectively. For the C6-NBD-PS probe, M remained unchanged in bFGF and TPA-treated cells, at around 85%. TPA treatment also induced a twofold increase in the lateral diffusion coefficients of C6-NBD-PC and C6-NBD-PE, while that of C6-NBD-PS remained nearly unchanged. These effects of TPA may be related to the observed loss of differentiated properties of vascular endothelial cells and not to its mitogenic properties.
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Julien M, Létouneau DR, Marois Y, Cardou A, King MW, Guidoin R, Chachra D, Lee JM. Shelf-life of bioprosthetic heart valves: a structural and mechanical study. Biomaterials 1997; 18:605-12. [PMID: 9134160 DOI: 10.1016/s0142-9612(96)00155-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
This study was undertaken to evaluate the influence of storage conditions on the shelf-life of porcine bioprosthetic valves. Fifty-five unimplanted porcine bioprostheses have been evaluated. The valves were stored in 0.5% buffered glutaraldehyde solution for different periods of time (7, 23 and 32 months). Twenty-eight valves were refrigerated while the remaining valves were stored at room temperature. The pH of the glutaraldehyde solution at room temperature decreased with time of storage, while that kept in the refrigerator remained stable over the course of the study. Macroscopic observations showed that the valve tissues kept at room temperature, especially for the periods of 23 and 32 months, became darker and more yellow in colour, whereas the refrigerated specimens exhibited no such changes in appearance. Scanning electron microscopy analysis revealed no noticeable differences on the surfaces of the leaflets stored under different conditions. Mechanical tests, including stress-strain response, stress relaxation and fracture behaviour, were carried out. Analysis of variance showed that the storage temperature, but not the length of storage, had a significant effect on some mechanical properties. The stress relaxation at 1000 s (P = 0.05), the ultimate tensile strength (P = 0.01) and the strain at fracture (P = 0.04) were all higher after storage at room temperature compared to the results after refrigeration. No statistically significant changes in the denaturation temperature of the collagen were observed between the different storage conditions. In conclusion, the storage temperature appears to have some influence on the bioprosthetic tissue. The bioprostheses stored under ambient conditions experience changes which may influence their longterm in vivo performance.
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Veyrières M, Baillet P, Hay JM, Fingerhut A, Bouillot JL, Julien M. Factors influencing long-term survival in 100 cases of small intestine primary adenocarcinoma. Am J Surg 1997; 173:237-9. [PMID: 9124635 DOI: 10.1016/s0002-9610(97)89599-2] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Factors influencing long-term survival in patients undergoing operation for adenocarcinoma of the small intestine are poorly recognized. METHODS Retrospective study of 100 cases culled within a 10-year period by questionnaire, including 59 males and 41 females, median age 61 years (range 30 to 86). No patients were lost to follow-up (median 27 months). All patients underwent operation: curative in 65% and palliative in 35%. RESULTS Overall actuarial 5-year survival was 38%, 0% after palliative treatment and 54% after curative resection. In patients undergoing curative resection, 5-year survival was 63% when the lymph nodes were not involved, and 52% when they were; 57% when the serosa was not involved, and 53% when it was; 56% when the tumor was well or moderately well differentiated and 40% when it was undifferentiated. Other factors influencing long-term survival were the emergency setting, the site, the multiplicity, and the size of tumor (none with statistically significant differences). Five and 10-year survival was 78% and 69%, respectively, when the patient was anemic compared with 35% and 17%, respectively when the patient was not (P <0.01). There were 14 patients with previous carcinoma, 2 with Crohn's disease, and 1 each with celiac disease and ileal tuberculosis. There were also 8 patients with associated duodenal and proximal jejunal polyps. Thirteen patients sustained a total of 14 further cancers. CONCLUSIONS Patients should be followed up closely because the possibility of sustaining another abdominal carcinoma is high (16%). As associated polyps are nearly always duodenal or jejunal, preoperative or intraoperative endoscopy of the upper gastrointestinal tract including the initial portion of the jejunum should be able to detect their presence and reduce the risk of early recurrence.
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Yang M, Deng X, Zhang Z, Julien M, Pelletier F, Desaulniers D, Cossette R, Teijeira FJ, Laroche G, Guidoin R. Are intraaortic balloons suitable for reuse? A survey study of 112 used intraaortic balloons. Artif Organs 1997; 21:121-30. [PMID: 9028494 DOI: 10.1111/j.1525-1594.1997.tb00348.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
To assess the safety of reusing single-use intraaortic balloon devices (IABs), 112 used devices were investigated in terms of physical integrity, gas leakage inspection, mechanical performance, surface chemistry and morphology, and physical stability. These IABs were all used clinically only once, and the duration of the IABs in vivo ranged from 6 to 312 h. Macroscopic examination of the balloons and the outer catheters revealed no obvious change in either shape or color. No discernible abrasions or cracks were observed on the balloons. However, 61% of the balloons were creased, and 40% of the central lumens and 21% of the sheaths showed visible bending flaws. Moreover, 65% of the balloons and 38% of the central lumens were contaminated by visible residual organic debris. The physical integrity of each device was verified in a specially designed leakage-fatigue tester for 72 h. Ninety-seven percent of the devices passed the leakage inspection. Stress-strain testing, differential scanning calorimetry, attenuated total reflection-Fourier transform infrared, and scanning electron microscopy analyses clearly indicated that there were no significant differences in the mechanical properties, bulk material morphology, surface chemistry, and external surface morphology between the used balloons and virgin controls. Although some surface modifications occurred on the internal side of the balloons, the external surfaces of most balloons suffered no trauma. Most of the used IABs examined in this study maintained physical and mechanical properties similar to those of the virgin devices. The chemistry of the balloon material was stable after short-term in vivo use. However, it does not seem possible to establish a rigorous protocol of cleaning, sterilization, and inspection to guarantee a safer reuse of these devices. The presence of residual organic debris that cannot be eliminated results in an imperative preclusion not to reuse the IABs.
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Prévost C, Julien M, Brown BP. Suicides associated with the Jacques Cartier Bridge, Montreal, Quebec 1988-1993: descriptive analysis and intervention proposal. CANADIAN JOURNAL OF PUBLIC HEALTH = REVUE CANADIENNE DE SANTE PUBLIQUE 1996; 87:377-80. [PMID: 9009392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Falls from heights represent an uncommon means of suicide. Regional variations are attributable to the presence of particular sites which attract suicidal individuals. The Jacques Cartier Bridge in Montreal is one such site, though less well known than North American sites such as the Golden Gate Bridge or Niagara Falls. According to Coroner's records, 54 suicides were associated with the bridge for the period 1988 to 1993. All but one of the suicides were the result of jumps from the bridge. The median age of victims was 30 years, and 46 of the victims were male. Bridge-specific verbalization of suicidal intent and prior history of medically diagnosed psychiatric disorders are frequently noted. Based on a review of the effectiveness of preventive measures, we propose limiting access to jumping by means of a fence along the bridge railing.
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Julien M, Carretta P, Horvatic M, Berthier C, Berthier Y, Ségransan P, Carrington A, Colson D. Spin gap in HgBa2Ca2Cu3O8+ delta single crystals from 63Cu NMR. PHYSICAL REVIEW LETTERS 1996; 76:4238-4241. [PMID: 10061236 DOI: 10.1103/physrevlett.76.4238] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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