1
|
Videira NB, Nair V, Paquet V, Calhoun D. The changing outlook of psychedelic drugs: The importance of risk assessment and occupational exposure limits. J Appl Toxicol 2024; 44:216-234. [PMID: 37646119 DOI: 10.1002/jat.4533] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 07/25/2023] [Accepted: 08/11/2023] [Indexed: 09/01/2023]
Abstract
Serotonergic psychedelics, such as lysergic acid diethylamide (LSD), psilocybin, dimethyltryptamine (DMT), and 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT), are currently being investigated for the treatment of psychiatric disorders such as depression and anxiety. Clinical trials with psilocybin and LSD have shown improvement in emotional and psychological scores. Although these drugs are reported to be safe in a controlled environment (such as clinical trials), exposure to low doses of these drugs can result in psychedelic effects, and therefore, occupational safety is an important consideration to prevent adverse effects in the workplace from low daily exposure. This article will discuss the factors involved in the derivation of occupational exposure limits (OELs) and risk assessment of these psychedelic drugs. To support the OEL derivations of psychedelic drugs, information regarding their mechanism of action, adverse effect profiles, pharmacokinetics, clinical effects, and nonclinical toxicity were considered. Additionally, psilocybin and LSD, which are the most extensively researched psychedelic substances, are employed as illustrative examples in case studies. The OELs derived for psilocybin and for LSD are 0.05 and 0.002 μg/m3 , respectively, which indicates that these are highly hazardous compounds, and it is important to take into account suitable safety measures and risk-management strategies in order to minimize workplace exposure.
Collapse
Affiliation(s)
| | | | - Valérie Paquet
- formerly Affygility Solutions, Broomfield, Colorado, USA
| | | |
Collapse
|
2
|
Azizi M, Mahfoud F, Weber MA, Sharp ASP, Schmieder RE, Lurz P, Lobo MD, Fisher NDL, Daemen J, Bloch MJ, Basile J, Sanghvi K, Saxena M, Gosse P, Jenkins JS, Levy T, Persu A, Kably B, Claude L, Reeve-Stoffer H, McClure C, Kirtane AJ, Mullin C, Thackeray L, Chertow G, Kahan T, Dauerman H, Ullery S, Abbott JD, Loening A, Zagoria R, Costello J, Krathan C, Lewis L, McElvarr A, Reilly J, Cash M, Williams S, Jarvis M, Fong P, Laffer C, Gainer J, Robbins M, Crook S, Maddel S, Hsi D, Martin S, Portnay E, Ducey M, Rose S, DelMastro E, Bangalore S, Williams S, Cabos S, Rodriguez Alvarez C, Todoran T, Powers E, Hodskins E, Paladugu V, Tecklenburg A, Devireddy C, Lea J, Wells B, Fiebach A, Merlin C, Rader F, Dohad S, Kim HM, Rashid M, Abraham J, Owan T, Abraham A, Lavasani I, Neilson H, Calhoun D, McElderry T, Maddox W, Oparil S, Kinder S, Radhakrishnan J, Batres C, Edwards S, Garasic J, Drachman D, Zusman R, Rosenfield K, Do D, Khuddus M, Zentko S, O'Meara J, Barb I, Foster A, Boyette A, Wang Y, Jay D, Skeik N, Schwartz R, Peterson R, Goldman JA, Goldman J, Ledley G, Katof N, Potluri S, Biedermann S, Ward J, White M, Mauri L, Sobieszczky P, Smith A, Aseltine L, Stouffer R, Hinderliter A, Pauley E, Wade T, Zidar D, Shishehbor M, Effron B, Costa M, Semenec T, Roongsritong C, Nelson P, Neumann B, Cohen D, Giri J, Neubauer R, Vo T, Chugh AR, Huang PH, Jose P, Flack J, Fishman R, Jones M, Adams T, Bajzer C, Mathur A, Jain A, Balawon A, Zongo O, Bent C, Beckett D, Lakeman N, Kennard S, D’Souza RJ, Statton S, Wilkes L, Anning C, Sayer J, Iyer SG, Robinson N, Sevillano A, Ocampo M, Gerber R, Faris M, Marshall AJ, Sinclair J, Pepper H, Davies J, Chapman N, Burak P, Carvelli P, Jadhav S, Quinn J, Rump LC, Stegbauer J, Schimmöller L, Potthoff S, Schmid C, Roeder S, Weil J, Hafer L, Agdirlioglu T, Köllner T, Böhm M, Ewen S, Kulenthiran S, Wachter A, Koch C, Fengler K, Rommel KP, Trautmann K, Petzold M, Ott C, Schmid A, Uder M, Heinritz U, Fröhlich-Endres K, Genth-Zotz S, Kämpfner D, Grawe A, Höhne J, Kaesberger B, von zur Mühlen C, Wolf D, Welzel M, Heinrichs G, Trabitzsch B, Cremer A, Trillaud H, Papadopoulos P, Maire F, Gaudissard J, Sapoval M, Livrozet M, Lorthioir A, Amar L, Paquet V, Pathak A, Honton B, Cottin M, Petit F, Lantelme P, Berge C, Courand PY, Langevin F, Delsart P, Longere B, Ledieu G, Pontana F, Sommeville C, Bertrand F, Feyz L, Zeijen V, Ruiter A, Huysken E, Blankestijn P, Voskuil M, Rittersma Z, Dolmans H, Kroon A, van Zwam W, Vranken J, de Haan. C, Renkin J, Maes F, Beauloye C, Lengelé JP, Huyberechts D, Bouvie A, Witkowski A, Januszewicz A, Kądziela J, Prejbisj A, Hering D, Ciecwierz D, Jaguszewski MJ, Owczuk R. Effects of Renal Denervation vs Sham in Resistant Hypertension After Medication Escalation: Prespecified Analysis at 6 Months of the RADIANCE-HTN TRIO Randomized Clinical Trial. JAMA Cardiol 2022; 7:1244-1252. [PMID: 36350593 PMCID: PMC9647563 DOI: 10.1001/jamacardio.2022.3904] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Importance Although early trials of endovascular renal denervation (RDN) for patients with resistant hypertension (RHTN) reported inconsistent results, ultrasound RDN (uRDN) was found to decrease blood pressure (BP) vs sham at 2 months in patients with RHTN taking stable background medications in the Study of the ReCor Medical Paradise System in Clinical Hypertension (RADIANCE-HTN TRIO) trial. Objectives To report the prespecified analysis of the persistence of the BP effects and safety of uRDN vs sham at 6 months in conjunction with escalating antihypertensive medications. Design, Setting, and Participants This randomized, sham-controlled, clinical trial with outcome assessors and patients blinded to treatment assignment, enrolled patients from March 11, 2016, to March 13, 2020. This was an international, multicenter study conducted in the US and Europe. Participants with daytime ambulatory BP of 135/85 mm Hg or higher after 4 weeks of single-pill triple-combination treatment (angiotensin-receptor blocker, calcium channel blocker, and thiazide diuretic) with estimated glomerular filtration rate (eGFR) of 40 mL/min/1.73 m2 or greater were randomly assigned to uRDN or sham with medications unchanged through 2 months. From 2 to 5 months, if monthly home BP was 135/85 mm Hg or higher, standardized stepped-care antihypertensive treatment starting with aldosterone antagonists was initiated under blinding to treatment assignment. Interventions uRDN vs sham procedure in conjunction with added medications to target BP control. Main Outcomes and Measures Six-month change in medications, change in daytime ambulatory systolic BP, change in home systolic BP adjusted for baseline BP and medications, and safety. Results A total of 65 of 69 participants in the uRDN group and 64 of 67 participants in the sham group (mean [SD] age, 52.4 [8.3] years; 104 male [80.6%]) with a mean (SD) eGFR of 81.5 (22.8) mL/min/1.73 m2 had 6-month daytime ambulatory BP measurements. Fewer medications were added in the uRDN group (mean [SD], 0.7 [1.0] medications) vs sham (mean [SD], 1.1 [1.1] medications; P = .045) and fewer patients in the uRDN group received aldosterone antagonists at 6 months (26 of 65 [40.0%] vs 39 of 64 [60.9%]; P = .02). Despite less intensive standardized stepped-care antihypertensive treatment, mean (SD) daytime ambulatory BP at 6 months was 138.3 (15.1) mm Hg with uRDN vs 139.0 (14.3) mm Hg with sham (additional decreases of -2.4 [16.6] vs -7.0 [16.7] mm Hg from month 2, respectively), whereas home SBP was lowered to a greater extent with uRDN by 4.3 mm Hg (95% CI, 0.5-8.1 mm Hg; P = .03) in a mixed model adjusting for baseline and number of medications. Adverse events were infrequent and similar between groups. Conclusions and Relevance In this study, in patients with RHTN initially randomly assigned to uRDN or a sham procedure and who had persistent elevation of BP at 2 months after the procedure, standardized stepped-care antihypertensive treatment escalation resulted in similar BP reduction in both groups at 6 months, with fewer additional medications required in the uRDN group. Trial Registration ClinicalTrials.gov Identifier: NCT02649426.
Collapse
Affiliation(s)
- Michel Azizi
- Université Paris Cité, F-75006 Paris, France,Assistance Publique–Hôpitaux de Paris, Hôpital Européen Georges-Pompidou, Hypertension Department and DMU CARTE, F-75015 Paris, France,INSERM, CIC1418, F-75015 Paris, France
| | - Felix Mahfoud
- Klinik für Innere Medizin III, Saarland University Hospital, Homburg/Saar, Germany,Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge
| | - Michael A. Weber
- Division of Cardiovascular Medicine, State University of New York, Downstate Medical Center, New York
| | - Andrew S. P. Sharp
- University Hospital of Wales, Cardiff and University of Exeter, Exeter, United Kingdom
| | - Roland E. Schmieder
- Nephrology and Hypertension, University Hospital Erlangen, Friedrich Alexander University, Erlangen, Germany
| | - Philipp Lurz
- Heart Center Leipzig, University of Leipzig, Leipzig, Germany
| | - Melvin D. Lobo
- Barts NIHR Biomedical Research Centre, William Harvey Research Institute, Queen Mary University of London, London, United Kingdom
| | | | - Joost Daemen
- Erasmus MC, University Medical Center Rotterdam, Department of Cardiology, Rotterdam, the Netherlands
| | - Michael J. Bloch
- Department of Medicine, University of Nevada School of Medicine, Vascular Care, Renown Institute of Heart and Vascular Health, Reno
| | - Jan Basile
- Division of Cardiovascular Medicine, Medical University of South Carolina, Ralph H. Johnson VA Medical Center, Charleston
| | | | - Manish Saxena
- Barts NIHR Biomedical Research Centre, William Harvey Research Institute, Queen Mary University of London, London, United Kingdom
| | | | | | - Terry Levy
- Royal Bournemouth Hospital, Dorset, United Kingdom
| | - Alexandre Persu
- Division of Cardiology, Cliniques Universitaires Saint-Luc and Pole of Cardiovascular Research, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, Brussels, Belgium
| | - Benjamin Kably
- Assistance Publique–Hôpitaux de Paris, Hôpital Européen Georges-Pompidou, Department of Pharmacology, Paris, France
| | | | | | | | - Ajay J. Kirtane
- Columbia University Medical Center/New York-Presbyterian Hospital and the Cardiovascular Research Foundation, New York
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Danny Do
- for the RADIANCE-HTN Investigators
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Jay Giri
- for the RADIANCE-HTN Investigators
| | | | - Thu Vo
- for the RADIANCE-HTN Investigators
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
3
|
Mariette X, Hermine O, Tharaux PL, Resche-Rigon M, Porcher R, Ravaud P, Bureau S, Dougados M, Tibi A, Azoulay E, Cadranel J, Emmerich J, Fartoukh M, Guidet B, Humbert M, Lacombe K, Mahevas M, Pene F, Pourchet-Martinez V, Schlemmer F, Yazdanpanah Y, Baron G, Perrodeau E, Vanhoye D, Kedzia C, Demerville L, Gysembergh-Houal A, Bourgoin A, Dalibey S, Raked N, Mameri L, Alary S, Hamiria S, Bariz T, Semri H, Hai DM, Benafla M, Belloul M, Vauboin P, Flamand S, Pacheco C, Walter-Petrich A, Stan E, Benarab S, Nyanou C, Montlahuc C, Biard L, Charreteur R, Dupré C, Cardet K, Lehmann B, Baghli K, Madelaine C, D'Ortenzio E, Puéchal O, Semaille C, Savale L, Harrois A, Figueiredo S, Duranteau J, Anguel N, Pavot A, Monnet X, Richard C, Teboul JL, Durand P, Tissieres P, Jevnikar M, Montani D, Bulifon S, Jaïs X, Sitbon O, Pavy S, Noel N, Lambotte O, Escaut L, Jauréguiberry S, Baudry E, Verny C, Noaillon M, Lefèvre E, Zaidan M, Le Tiec CLT, Verstuyft C, Roques AM, Grimaldi L, Molinari D, Leprun G, Fourreau A, Cylly L, Virlouvet M, Meftali R, Fabre S, Licois M, Mamoune A, Boudali Y, Georgin-Lavialle S, Senet P, Pialoux G, Soria A, Parrot A, François H, Rozensztajn N, Blin E, Choinier P, Camuset J, Rech JS, Canellas A, Rolland-Debord C, Lemarié N, Belaube N, Nadal M, Siguier M, Petit-Hoang C, Chas J, Drouet E, Lemoine M, Phibel A, Aunay L, Bertrand E, Ravato S, Vayssettes M, Adda A, Wilpotte C, Thibaut P, Fillon J, Debrix I, Fellahi S, Bastard JP, Lefèvre G, Fallet V, Gottenberg JE, Hansmann Y, Andres E, Bayer S, Becker G, Blanc F, Brin S, Castelain V, Chatelus E, Chatron E, Collange O, Danion F, De Blay F, Demonsant E, Diemunsch P, Diemunsch S, Felten R, Goichot B, Greigert V, Guffroy A, Heger B, Hutt A, Kaeuffer C, Kassegne L, Korganow AS, Le Borgne P, Lefebvre N, Martin T, Mertes PM, Metzger C, Meyer N, Nisand G, Noll E, Oberlin M, Ohlmann-Caillard S, Poindron V, Pottecher J, Ruch Y, Sublon C, Tayebi H, Weill F, Mekinian A, Abisror N, Jachiet V, Chopin D, Fain O, Garnier M, Krause le Garrec J, Morgand M, Pacanowski J, Urbina T, McAvoy C, Pereira M, Aratus G, Berard L, Simon T, Daguenel-Nguyen A, Antignac M, Leplay C, Arlet JB, Diehl JL, Bellenfant F, Blanchard A, Buffet A, Cholley B, Fayol A, Flamarion E, Godier A, Gorget T, Hamada SR, Hauw-Berlemont C, Hulot JS, Lebeaux D, Livrozet M, Michon A, Neuschwander A, Penet MA, Planquette B, Ranque B, Sanchez O, Volle G, Briois S, Cornic M, Elisee V, Jesuthasan D, Djadi-Prat J, Jouany P, Junquera R, Henriques M, Kebir A, Lehir I, Meunier J, Patin F, Paquet V, Tréhan A, Vigna V, Sabatier B, Bergerot D, Jouve C, Knosp C, Lenoir O, Mahtal N, Resmini L, Lescure FX, Ghosn J, BACHELARD A, BIRONNE T, BORIE R, BOUNHIOL A, BOUSSARD C, CHAUFFiER J, CHALAL S, CHALAL L, CHANSOMBAT M, CRESPIN P, CRESTANI B, DACONCEICAO O, DECONINCK L, DIEUDE P, DOSSIER A, DUBERT M, DUCROCQ G, FUENTES A, GERVAIS A, GILBERT M, ISERNIA V, ISMAEL S, JOLY V, JULIA Z, LARIVEN S, LE GAC S, LE PLUART D, LOUNI F, NDIAYE A, PAPO T, PARISEY M, PHUNG B, POURBAIX A, RACHLINE A, RIOUX C, SAUTEREAU A, STEG G, TARHINI H, VALAYER S, VALLOIS D, VERMES P, VOLPE T, Nguyen Y, Honsel V, Weiss E, Codorniu A, Zarrouk V, De Lastours V, Uzzan M, Olivier O, Rossi G, Gamany N, Rahli R, Louis Z, Boutboul D, Galicier L, Amara Y, Archer G, Benattia A, Bergeron A, Bondeelle L, De Castro N, Clément M, Darmont M, Denis B, Dupin C, Feredj E, Feyeux D, Joseph A, Lengliné E, Le Guen P, Liégeon G, Lorillon G, Mabrouki A, Mariotte E, Martin de Frémont G, Mirouse A, Molina JM, Peffault de Latour R, Oksenhendler E, Saussereau J, Tazi A, Tudesq JJ, Zafrani L, Brindele I, Bugnet E, Celli Lebras K, Chabert J, Djaghout L, Fauvaux C, Jegu AL, Kozaliewicz E, Meunier M, Tremorin MT, Davoine C, Madeleine I, Caillat-Zucman S, Delaugerre C, Morin F, SENE D, BURLACU R, CHOUSTERMAN B, MEGARBANE B, RICHETTE P, RIVELINE JP, FRAZIER A, VICAUT E, BERTON L, HADJAM T, VASQUEZ-IBARRA MA, JOURDAINE C, JACOB A, SMATI J, RENAUD S, MANIVET P, PERNIN C, SUAREZ L, Semerano L, ABAD S, Benainous R, Bloch Queyrat C, Bonnet N, Brahmi S, Cailhol J, Cohen Y, Comparon C, Cordel H, Dhote R, Dournon N, Duchemann B, Ebstein N, Giroux-Leprieur B, Goupil de Bouille J, Jacolot A, Nunes H, Oziel J, Rathouin V, Rigal M, Roulot D, Tantet C, Uzunhan Y, COSTEDOAT-CHALUMEAU N, Ait Hamou Z, Benghanem S, BLANCHE P, CANOUI E, CARLIER N, CHAIGNE B, CONTEJEAN A, DUNOGUE B, DUPLAND P, DUREL - MAURISSE A, GAUZIT R, JAUBERT P, Joumaa H, Jozwiak M, KERNEIS S, LACHATRE M, Lafoeste H, LEGENDRE P, LUONG NGUYEN LB, MAREY J, MORBIEU C, MOUTHON L, NGUYEN L, Palmieri LJ, REGENT A, SZWEBEL TA, TERRIER B, GUERIN C, ZERBIT J, CHEREF K, CHITOUR K, CISSE MS, CLARKE A, CLAVERE G, DUSANTER I, GAUDEFROY C, JALLOULI M, KOLTA S, LE BOURLOUT C, MARIN N, MENAGE N, MOORES A, PEIGNEY I, PIERRON C, SALEH-MGHIR S, VALLET M, MICHEL M, MELICA G, LELIEVRE JD, FOIS E, LIM P, MATIGNON M, GUILLAUD C, THIEMELE A, SCHMITZ D, BOUHRIS M, BELAZOUZ S, LANGUILLE L, MEKONTSO-DESSAPS A, SADAOUI T, Mayaux J, Cacoub P, Corvol JC, Louapre C, Sambin S, Mariani LL, Karachi C, Tubach F, Estellat C, Gimeno L, Martin K, Bah A, Keo V, Ouamri S, Messaoudi Y, Yelles N, Faye P, Cavelot S, Larcheveque C, Annonay L, Benhida J, Zahrate-Ghoul A, Hammal S, Belilita R, Lecronier M, Beurton A, Haudebourg L, Deleris R, Le Marec J, Virolle S, Nemlaghi S, Bureau C, Mora P, De Sarcus M, Clovet O, Duceau B, Grisot PH, Pari MH, Arzoine J, Clarac U, Faure M, Delemazure J, Decavele M, Morawiec E, Demoule A, Dres M, Vautier M, Allenbach Y, Benveniste O, Leroux G, Rigolet A, Guillaume-Jugnot P, Domont F, Desbois AC, Comarmond C, Champtiaux N, Toquet S, Ghembaza A, Vieira M, Maalouf G, Boleto G, Ferfar Y, Charbonnier F, AGUILAR C, ALBY-LAURENT F, ALYANAKIAN MA, BAKOUBOULA P, BROISSAND C, BURGER C, CAMPOS-VEGA C, CHAVAROT N, CHOUPEAUX L, FOURNIER B, GRANVILLE S, ISSORAT E, ROUZAUD C, VIMPERE D, Geri G, Derridj N, Sguiouar N, Meddah H, Djadel M, Chambrin-Lauvray H, Duclos-Vallée JC, Saliba F, Sacleux SC, Koumis I, Michot JM, Stoclin A, Colomba E, Pommeret F, Willekens C, Sakkal M, Da Silva R, Dejean V, Mekid Y, Ben-Mabrouk I, Pradon C, Drouard L, Camara-Clayette V, Morel A, Garcia G, Mohebbi A, Berbour F, Dehais M, Pouliquen AL, Klasen A, Soyez-Herkert L, London J, Keroumi Y, Guillot E, Grailles G, El Amine Y, Defrancq F, Fodil H, Bouras C, Dautel D, Gambier N, Dieye T, Razurel A, Bienvenu B, Lancon V, Lecomte L, Beziriganyan K, Asselate B, Allanic L, Kiouris E, Legros MH, Lemagner C, Martel P, Provitolo V, Ackermann F, Le Marchand M, Clan Hew Wai A, Fremont D, Coupez E, Adda M, Duée F, Bernard L, Gros A, Henry E, Courtin C, Pattyn A, Guinot PG, Bardou M, Maurer A, Jambon J, Cransac A, Pernot C, Mourvillier B, Servettaz A, Deslée G, Wynckel A, Benoit P, Marquis E, Roux D, Gernez C, Yelnik C, Poissy J, Nizard M, Denies F, Gros H, Mourad JJ, Sacco E, Renet S. Sarilumab in adults hospitalised with moderate-to-severe COVID-19 pneumonia (CORIMUNO-SARI-1): An open-label randomised controlled trial. The Lancet Rheumatology 2022; 4:e24-e32. [PMID: 34812424 PMCID: PMC8598187 DOI: 10.1016/s2665-9913(21)00315-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Background Patients with COVID-19 pneumonia can have increased inflammation and elevated cytokines, including interleukin (IL)-6, which might be deleterious. Thus, sarilumab, a high-affinity anti-IL-6 receptor antibody, might improve the outcome of patients with moderate-to-severe COVID-19 pneumonia. Methods We did a multicentric, open-label, Bayesian randomised, adaptive, phase 2/3 clinical trial, nested within the CORIMUNO-19 cohort, to test a superiority hypothesis. Patients 18 years or older hospitalised with COVID-19 in six French centres, requiring at least 3L/min of oxygen but without ventilation assistance and a WHO Clinical Progression Scale [CPS] score of 5 were enrolled. Patients were randomly assigned (1:1) via a web-based system, according to a randomisation list stratified on centre and with blocks randomly selected among 2 and 4, to receive usual care plus 400 mg of sarilumab intravenously on day 1 and on day 3 if clinically indicated (sarilumab group) or usual care alone (usual care group). Primary outcomes were the proportion of patients with WHO-CPS scores greater than 5 on the 10-point scale on day 4 and survival without invasive or non-invasive ventilation at day 14. This completed trial is closed to new participants and is registered with ClinicalTrials.gov, NCT04324073. Findings 165 patients were recruited from March 27 to April 6, 2020, and 148 patients were randomised (68 patients to the sarilumab group and 80 to the usual care group) and followed up for 90 days. Median age was 61·7 years [IQR 53·0–71·1] in the sarilumab group and 62·8 years [56·0–71·7] in the usual care group. In the sarilumab group 49 (72%) of 68 were men and in the usual care group 59 (78%) of 76 were men. Four patients in the usual care group withdrew consent and were not analysed. 18 (26%) of 68 patients in the sarilumab group had a WHO-CPS score greater than 5 at day 4 versus 20 (26%) of 76 in the usual care group (median posterior absolute risk difference 0·2%; 90% credible interval [CrI] −11·7 to 12·2), with a posterior probability of absolute risk difference greater than 0 of 48·9%. At day 14, 25 (37%) patients in the sarilumab and 26 (34%) patients in the usual care group needed ventilation or died, (median posterior hazard ratio [HR] 1·10; 90% CrI 0·69–1·74) with a posterior probability HR greater than 1 of 37·4%. Serious adverse events occurred in 27 (40%) patients in the sarilumab group and 28 (37%) patients in the usual care group (p=0·73). Interpretation Sarilumab treatment did not improve early outcomes in patients with moderate-to-severe COVID-19 pneumonia. Further studies are warranted to evaluate the effect of sarilumab on long-term survival. Funding Assistance publique—Hôpitaux de Paris
Collapse
|
4
|
Perez B, Choi J, Paquet V, Lenker J, Kocher L, Nemade M, Kern C, Steinfeld E. Comparison of wheelchair securement systems designed for use in large accessible transit vehicles (LATVs). Assist Technol 2021; 33:105-115. [PMID: 31070523 DOI: 10.1080/10400435.2019.1604582] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
Design challenges in wheelchair securement for fixed-route, large accessible transit vehicles (LATVs) often create difficulties for passengers who use wheelchairs and operational inefficiencies for public transit agencies. Recent innovations in wheelchair securement technology for LATVs may reduce these challenges. This study explored the usability of three commercially available wheelchair securement systems in a static laboratory environment: a four-point, forward-facing (4P-FF) securement system, a three-point, forward-facing (3P-FF) securement system, and a semi-automated, rear-facing (SA-RF) securement system. Three groups of mobility device users (manual wheelchair users, power wheelchair users, and scooter users) (n = 36) completed wheelchair securement tasks in a full-scale mock-up of an LATV. For the 19 participants who did not use the occupant restraint system (ORS), perceived usability and securement time were compared across the securement systems. Using multiple usability rating scales, most participants reported that each of the systems would be acceptable for regular use. However, the majority indicated an overall preference for the SA-RF, and most rated the SA-RF system as easier, faster, and requiring less assistance to use than the 4P-FF and 3P-FF systems. Alternatives to conventional 4P-FF wheelchair securement in LATVs may thus improve boarding efficiency and transit independence of passengers who use wheelchairs.
Collapse
Affiliation(s)
- B Perez
- Center for Inclusive Design & Environmental Access, School of Architecture & Planning, University at Buffalo, SUNY, Buffalo, New York, USA
| | - J Choi
- Center for Inclusive Design & Environmental Access, School of Architecture & Planning, University at Buffalo, SUNY, Buffalo, New York, USA
| | - V Paquet
- Center for Inclusive Design & Environmental Access, School of Architecture & Planning, University at Buffalo, SUNY, Buffalo, New York, USA.,Department of Industrial & Systems Engineering, University at Buffalo, SUNY, Buffalo, New York, USA
| | - J Lenker
- Center for Inclusive Design & Environmental Access, School of Architecture & Planning, University at Buffalo, SUNY, Buffalo, New York, USA.,Department of Rehabilitation Science, University at Buffalo, SUNY, Buffalo, New York, USA
| | - L Kocher
- Center for Inclusive Design & Environmental Access, School of Architecture & Planning, University at Buffalo, SUNY, Buffalo, New York, USA.,Department of Industrial & Systems Engineering, University at Buffalo, SUNY, Buffalo, New York, USA
| | - M Nemade
- Center for Inclusive Design & Environmental Access, School of Architecture & Planning, University at Buffalo, SUNY, Buffalo, New York, USA.,Department of Industrial & Systems Engineering, University at Buffalo, SUNY, Buffalo, New York, USA
| | - C Kern
- Center for Inclusive Design & Environmental Access, School of Architecture & Planning, University at Buffalo, SUNY, Buffalo, New York, USA
| | - E Steinfeld
- Center for Inclusive Design & Environmental Access, School of Architecture & Planning, University at Buffalo, SUNY, Buffalo, New York, USA
| |
Collapse
|
5
|
Singh R, Yurteri-Kaplan L, Morrow M, Weaver A, Mcgree M, Zhu X, Paquet V, Gebhart J, Hallbeck S. 7: Does sitting or standing make a difference in vaginal surgery? Am J Obstet Gynecol 2017. [DOI: 10.1016/j.ajog.2016.12.131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
6
|
Monge M, Paquet V, Bergerot D, Zhygalina V, Blanchard A. Dose-effect relationship of perindopril 10, 14 and 20 mg assessed by urine and plasma AcSDKP levels in mildly sodium-depleted healthy volunteers. Int J Cardiol 2016; 222:648-653. [DOI: 10.1016/j.ijcard.2016.07.164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 07/27/2016] [Indexed: 10/21/2022]
|
7
|
Gauthier N, Caron M, Pedro L, Arcand M, Blouin J, Labonté A, Normand C, Paquet V, Rodenbrock A, Roy M, Rouleau N, Beaudet L, Padrós J, Rodriguez-Suarez R. Development of homogeneous nonradioactive methyltransferase and demethylase assays targeting histone H3 lysine 4. ACTA ACUST UNITED AC 2011; 17:49-58. [PMID: 21940714 DOI: 10.1177/1087057111416659] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Histone posttranslational modifications are among the epigenetic mechanisms that modulate chromatin structure and gene transcription. Histone methylation and demethylation are dynamic processes controlled respectively by histone methyltransferases (HMTs) and demethylases (HDMs). Several HMTs and HDMs have been implicated in cancer, inflammation, and diabetes, making them attractive targets for drug therapy. Hence, the discovery of small-molecule modulators for these two enzyme classes has drawn significant attention from the pharmaceutical industry. Herein, the authors describe the development and optimization of homogeneous LANCE Ultra and AlphaLISA antibody-based assays for measuring the catalytic activity of two epigenetic enzymes acting on lysine 4 of histone H3: SET7/9 methyltransferase and LSD1 demethylase. Both the SET7/9 and LSD1 assays were designed as signal-increase assays using biotinylated peptides derived from the N-terminus of histone H3. In addition, the SET7/9 assay was demonstrated using full-length histone H3 protein as substrate in the AlphaLISA format. Optimized assays in 384-well plates are robust (Z' factors ≥0.7) and sensitive, requiring only nanomolar concentrations of enzyme and substrate. All assays allowed profiling of known SET7/9 and LSD1 inhibitors. The results demonstrate that the optimized LANCE Ultra and AlphaLISA assay formats provide a relevant biochemical screening approach toward the identification of small-molecule inhibitors of HMTs and HDMs that could lead to novel epigenetic therapies.
Collapse
Affiliation(s)
- Nancy Gauthier
- PerkinElmer,1744 William Street, Suite 600, Montreal, Quebec, Canada, H3J 1R4
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Heming M, Danielzik B, Otto J, Paquet V, Fattinger C. Plasma Impulse CVD Deposited TiO2 Waveguiding Films: Properties and Potential Applications in Integrated Optical Sensor Systems. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-276-117] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTPlasma impulse CVD deposited titania thin films, deposited at low substrate temperatures, exhibit low volume losses of < 0.2 dB/cm and high environmental stability. Their use in novel concepts for integrated optical immunosensors is discussed.
Collapse
|
9
|
Abstract
Novel cationic amphotericin B derivatives as highly potent antifungal agents are reported. These semi-synthetic derivatives of amphotericin B were elaborated through a series of modifications both on the nitrogen atom of the mycosamine and on the C-16 carboxylic acid moiety. The antifungal activity of the new conjugates was tested against Saccharomyces cerevisiae and also against nine different strains of Candida albicans and Candida glabrata, including an amphotericin resistant strain. High potency was observed in the case of polyamine derivatives bearing two 3-aminopropyl chains on the mycosamine. The evaluation of the biological properties also included the determination of the hemolytic activity of the compounds by measuring the EH50 values.
Collapse
Affiliation(s)
- Valérie Paquet
- Laboratorium für Organische Chemie, ETH Zürich, HCI H335, 8093 Zürich, Switzerland
| | | | | |
Collapse
|
10
|
Abstract
To combine estimates of trunk posture and force into an integrated measure of load on the low back, continuous variables for body angles were estimated by assuming specified distributions within corresponding posture categories with Monte-Carlo (MC) simulation. The estimated posture angles were compared with reference measurements from the Lumbar Motion Monitor and inclinometers. The lumbar compression estimates, generated from simulated posture angles and from direct measurement, were compared. Trunk flexion showed high correlation between direct measurements and simulated angles, as did L5/S1 compression. The MC approach to extracting continuous posture angles from categorized observations did not appear to introduce large error in the variables used to estimate spinal compressive forces. When instrumentation methods of postural assessment are not feasible, a simulation approach combined with biomechanical modelling could be used to integrate multiple external exposure variables into estimates of compressive forces acting on the low back.
Collapse
Affiliation(s)
- S Tak
- University of Massachusetts Lowell, One University Avenue, Lowell, MA 01854, USA.
| | | | | | | | | |
Collapse
|
11
|
Abstract
[reaction: see text] New derivatives of Amphotericin B (AmB) were synthesized through a double reductive alkylation of the mycosamine. These derivatives of AmB displayed superior antifungal activity against Saccharomyces cerevisiae wild-type strain and especially in the case of an AmB-resistant Candida albicans strain. Moreover, these compounds are potential drug candidates because of significantly reduced hemotoxicity compared to AmB. Furthermore, the same mycosamine modification can be applied to other polyene macrolides such as Nystatin and Pimaricin to improve their antifungal activity.
Collapse
Affiliation(s)
- Valérie Paquet
- Laboratorium für Organische Chemie, ETH Hönggerberg, CH-8093 Zürich, Switzerland
| | | |
Collapse
|
12
|
Abstract
In order to provide tools for investigations of amphotericin B ion channels, new conjugates bearing a calix[4]arene scaffold covalently linked to four amphotericin B molecules were synthesized. These macromolecules adopt a cone conformation that mimics the structure of a transmembrane pore. The antifungal activity of the conjugates 3 and 4 was superior or similar to that of native amphotericin B, with minimal inhibitory concentration values of 0.10 and 0.25 microM, respectively. Furthermore, the hemotoxicity of the new conjugates was considerably lower (at least 10 times) than the hemotoxicity of monomeric amphotericin B. Finally, the formation of ion channels in the lipid bilayer by the amphotericin B tetramer was monitored by measuring the K+ efflux from various liposomes.
Collapse
Affiliation(s)
- Valérie Paquet
- Laboratorium für Organische Chemie, ETH Hönggerberg, CH-8093 Zürich, Switzerland
| | | | | |
Collapse
|
13
|
Lebel H, Paquet V. Rhodium-Catalyzed Synthesis of Terminal Alkenes. SYNTHESIS-STUTTGART 2005. [DOI: 10.1055/s-2004-834920] [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: 10/25/2022]
|
14
|
Abstract
The present study aims at evaluating the spatial disparity response profiles of binocular cells in the superficial layers of the superior colliculus of the cat using drifting light bars and phase-shifted spatial frequency gratings. Results show that a total of 64% of the cells were sensitive to phase disparities and had large tuning profiles. Similarly, a large proportion (75%) of those tested with position offsets showed one of the four classic disparity profiles, those of the tuned cells being rather coarse. When tested with both position and phase disparities, 54% of the cells showed sensitivity profiles to the two types of stimuli. The overall results suggest that the superior colliculus is involved in the analysis of coarse stereopsis and/or the planning and initiation of saccades during vergence eye movements and/or the control of fine adjustments to maintain fixation as the stimulus moves in depth.
Collapse
Affiliation(s)
- Daniel Mimeault
- Université de Montréal, Groupe de Recherche en Neuropsychologie et Cognition, C.P. 6128, Succ. Centre-Ville, Montréal, Canada H3C 3J7
| | | | | | | | | |
Collapse
|
15
|
Abstract
A series of cascade processes for the synthesis of alkenes from alcohols is described. Each individual step is catalyzed with a specific transition metal complex. The oxidation-methylenation one-pot procedure took place in the presence of a palladium and a rhodium catalyst to produce the desired terminal alkenes in high yields. A methylenation-ring-closing metathesis allowed the synthesis of cyclic alkenes from carbonyl derivatives, using the second-generation metathesis catalyst. Finally, an oxidation-methylenation-RCM process that involves up to three different transition metal catalysts in the same vessel is presented.
Collapse
Affiliation(s)
- Hélène Lebel
- Département de chimie, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montréal, Québec, Canada H3C 3J7.
| | | |
Collapse
|
16
|
Abstract
[reaction: see text] The rhodium(I)-catalyzed methylenation of ketones using trimethylsilyldiazomethane proceeds to give the corresponding alkenes in good yields (60-97%). The use of an excess of 2-propanol and 1,4-dioxane as a solvent were instrumental to obtain the desired alkenes in high yields. Superior results were achieved with the rhodium(I)-catalyzed methylenation in comparison with the standard Wittig reaction.
Collapse
Affiliation(s)
- Hélène Lebel
- Département de chimie, Université de Montréal, P.O. Box 6128, Station Downtown, Montréal, Québec, Canada H3C 3J7
| | | | | | | |
Collapse
|
17
|
Affiliation(s)
- Hélène Lebel
- Département de Chimie, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, Québec, Canada H3C 3J7
| | - Valérie Paquet
- Département de Chimie, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, Québec, Canada H3C 3J7
| |
Collapse
|
18
|
Abstract
The rhodium-catalyzed methylenation of aldehydes using trimethylsilyldiazomethane and triphenylphosphine produces a variety of terminal alkenes in excellent yields. These mild and nonbasic reaction conditions allow the conversion of enolizable substrates (keto aldehydes and nonracemic alpha-substituted aldehydes) to terminal alkenes without epimerization. Optimization of the reaction conditions led to the conclusion that a variety of rhodium(I) sources can be used as catalysts. The effect of the solvent on the reaction has also been studied, and it indicates that although the THF is the best solvent, other solvents may be used. The reactivity of the system is very much dependent on the nature of the phosphine reagent. The use of an easily removable phosphine is also described. Spectroscopic studies indicate that the reaction proceeds via an unusual mechanism which leads to the in situ formation of the salt-free phosphorus ylide, methylenetriphenylphosphorane.
Collapse
Affiliation(s)
- Hélène Lebel
- Département de Chimie, Université de Montréal, C. P. 6128, Succursale Centre-Ville, Montréal, Québec, Canada H3C 3J7.
| | | |
Collapse
|
19
|
Aravindakshan J, Paquet V, Gregory M, Dufresne J, Fournier M, Marcogliese DJ, Cyr DG. Consequences of xenoestrogen exposure on male reproductive function in spottail shiners (Notropis hudsonius). Toxicol Sci 2003; 78:156-65. [PMID: 14657511 DOI: 10.1093/toxsci/kfh042] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.8] [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: 11/14/2022] Open
Abstract
There is limited information on the physiological consequences associated with exposure to xenoestrogens under field conditions. The objectives of this study were to determine the presence of estrogenic chemicals in the St. Lawrence River and their effects on male reproduction in the spottail shiner (Notropis hudsonius). Hepatic vitellogenin (VTG) mRNA levels in immature shiners indicate extensive estrogenic contamination spanning almost 50 km both upstream and downstream from the island of Montreal. Stages of spermatogenesis were assessed in fish captured at sites having varying levels of estrogenic contamination. In control fish, 95% had testis of either stage IV (50%) or stage V (45%) of spermatogenesis. At Ile Dorval, where VTG mRNA levels are moderate, fish had testes of stage III (38%) and IV (45%) and only 15% of fish were at spermatogenic stage V. In contrast, at Ilet Vert and Ile Beauregard, located in the sewage effluent plume from the City of Montreal and where hepatic VTG mRNA levels are high in fish, none of the fish were at stage V and 8% of fish at Ilet Vert were at stage II of development. Sperm concentration and various motility parameters were significantly lower in shiners from Ilet Vert as compared with those from Iles de la Paix (reference). Histological analyses of testes revealed that more than one-third of the fish captured at sites with the highest estrogenic contamination displayed intersex, a condition in which ovarian follicles were developing within the testis. These data indicate that there is significant estrogenic contamination in the St. Lawrence River that is associated with impaired reproductive function in male fish.
Collapse
Affiliation(s)
- Jayaprakash Aravindakshan
- INRS-Institut Armand-Frappier, Université du Québec, 245 Hymus Boulevard, Pointe Claire, Québec, Canada H9R 1G6
| | | | | | | | | | | | | |
Collapse
|
20
|
Abstract
The alkylation of phosphine boranes with various electrophiles proceeds with good to excellent yields in a biphasic solution in the presence of tetrabutylammonium bromide as a phase-transfer catalyst. [reaction: see text]
Collapse
Affiliation(s)
- Hélène Lebel
- Département de Chimie, Université de Montréal, P.O. Box 6128, Station Downtown, Montréal, Québec, Canada, H3C 3J7.
| | | | | |
Collapse
|
21
|
Abstract
Binocular interactions were investigated in area 19 of the anaesthetized cat using dichoptically presented phase-shifted static spatial frequency gratings that flickered at a fixed temporal rate. More than two-thirds of the binocular cells showed phase specificity to static phase disparities leading to either summation or facilitation interactions. This proportion of spatial disparity selectivity was higher than that shown for the same area (one-third of the units) when drifting light bars or drifting spatial frequencies were used to create disparities. The range of phase disparities encoded by binocular cells in area 19 is inversely related to the optimal spatial frequency of the dominant eye. Thus, cells in this area are tuned to coarse spatial disparities which, as supported by behavioural studies, could reflect its involvement in the analysis of stereoscopic pattern having gross disparities but devoid of motion cues. Because of the nature of its interconnections with numerous visual cortical areas, area 19 could serve as a way station where stereoscopic information could be first analysed and sent to other higher order areas for a complete representation of three-dimensional objects.
Collapse
Affiliation(s)
- Daniel Mimeault
- Université de Montréal, Groupe de Recherche en Neuropsychologie Expérimentale,Département de Psychologie, C.P. 6128, Succ. Centre-Ville, Montréal, H3C 3J7, Canada
| | | | | | | |
Collapse
|
22
|
Grasa GA, Moore Z, Martin KL, Stevens ED, Nolan SP, Paquet V, Lebel H. Structural characterization and catalytic activity of the rhodium–carbene complex Rh(PPh3)2(IMes)Cl (IMes=bis(1,3-(2,4,6-trimethylphenyl)imidazol-2-ylidene). J Organomet Chem 2002. [DOI: 10.1016/s0022-328x(02)01638-8] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
23
|
Abstract
[reaction: see text] The rhodium(I)-catalyzed methylenation of functionalized fluorinated ketones using trimethylsilyldiazomethane proceeds to give the corresponding fluoromethylalkenes in good yields (61-90%). Remarkable chemoselectivity was observed for the synthesis of keto-substituted organofluorine alkenes.
Collapse
Affiliation(s)
- Hélène Lebel
- Département de Chimie, Université de Montréal, P.O. Box 6128, Station Downtown, Montréal, Québec, Canada H3C 3J7.
| | | |
Collapse
|
24
|
Lebel H, Paquet V, Proulx C. Methylenation of Aldehydes: Transition Metal Catalyzed Formation of Salt-Free Phosphorus Ylides We thank the Charette group (Université de Montréal) for generously sharing their chemicals and equipment. This research was supported by NSERC (Canada), F.C.A.R (Québec), the Foundation for Innovation, and the Université de Montréal. Angew Chem Int Ed Engl 2001; 40:2887-2890. [PMID: 11500898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Affiliation(s)
- Hélène Lebel
- Département de chimie Université de Montréal P.O. Box 6128, Station Downtown Montréal, Québec, H3C 3J7 (Canada)
| | | | | |
Collapse
|
25
|
Lebel H, Paquet V, Proulx C. Methylenation of Aldehydes: Transition Metal Catalyzed Formation of Salt-Free Phosphorus Ylides. Angew Chem Int Ed Engl 2001; 40:2887-2890. [DOI: 10.1002/1521-3773(20010803)40:15<2887::aid-anie2887>3.0.co;2-q] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2001] [Revised: 05/07/2001] [Indexed: 11/08/2022]
|
26
|
|
27
|
Dallies N, François J, Paquet V. A new method for quantitative determination of polysaccharides in the yeast cell wall. Application to the cell wall defective mutants of Saccharomyces cerevisiae. Yeast 1998; 14:1297-306. [PMID: 9802208 DOI: 10.1002/(sici)1097-0061(1998100)14:14<1297::aid-yea310>3.0.co;2-l] [Citation(s) in RCA: 158] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A reliable acid hydrolysis method for quantitative determination of the proportion of beta-glucan, mannan and chitin in Saccharomyces cerevisiae cell wall is reported together with a simple extraction procedure to quantify within a standard error of less than 2% the proportion of the wall per gram of cell dry mass. This method is an optimized version of Saeman's procedure based on sulfuric acid hydrolysis of complex polysaccharides. It resulted in an almost complete release of glucose, mannose and glucosamine residues from cell wall polysaccharides. After complete removal of sulfate ions by precipitation with barium hydroxide, the liberated monosaccharides were separated and quantified by high performance anion-exchange chromatography with pulsed amperometric detection. The superiority of this method over the hydrolysis in either trifluoroacetic or hydrochloric acid resides in its higher efficiency regarding the release of glucose from beta 1,6-glucan and of glucosamine from chitin. The sulfuric acid method was successfully applied to determine the beta-glucan, mannan and chitin contents in cell walls of genetically well-characterized yeast mutants defective in cell wall biosynthesis, and in Schizosaccharomyces pombe cell walls. The simplicity and reliability of this procedure make it the method of choice for the characterization of cell walls from S. cerevisiae mutants generated in the EUROFAN programme, as well as for other pharmacological and biotechnological applications.
Collapse
Affiliation(s)
- N Dallies
- Centre de Bioingenierie Gilbert Durand, UMR-CNRS 5504, LA. INRA, Departement de Genie Biochimique et Alimentaire, Institut National des Sciences Appliquees, Toulouse, France
| | | | | |
Collapse
|
28
|
Affiliation(s)
- Jamila Amor Nait Ajjou
- Department of Chemistry, University of Ottawa 10 Marie Curie, Ottawa, Ontario, Canada K1N 6N5
| | - Susannah L. Scott
- Department of Chemistry, University of Ottawa 10 Marie Curie, Ottawa, Ontario, Canada K1N 6N5
| | - Valérie Paquet
- Department of Chemistry, University of Ottawa 10 Marie Curie, Ottawa, Ontario, Canada K1N 6N5
| |
Collapse
|
29
|
Buchholz B, Paquet V, Punnett L, Lee D, Moir S. PATH: a work sampling-based approach to ergonomic job analysis for construction and other non-repetitive work. Appl Ergon 1996; 27:177-187. [PMID: 15677058 DOI: 10.1016/0003-6870(95)00078-x] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A high prevalence and incidence of work-related musculoskeletal disorders have been reported in construction work. Unlike industrial production-line activity, construction work, as well as work in many other occupations (e.g. agriculture, mining), is non-repetitive in nature; job tasks are non-cyclic, or consist of long or irregular cycles. PATH (Posture, Activity, Tools and Handling), a work sampling-based approach, was developed to characterize the ergonomic hazards of construction and other non-repetitive work. The posture codes in the PATH method are based on the Ovako Work Posture Analysing System (OWAS), with other codes included for describing worker activity, tool use, loads handled and grasp type. For heavy highway construction, observations are stratified by construction stage and operation, using a taxonomy developed specifically for this purpose. Observers can code the physical characteristics of the job reliably after about 30 h of training. A pilot study of six construction laborers during four road construction operations suggests that laborers spend large proportions of time in nonneutral trunk postures and spend approximately 20% of their time performing manual material handling tasks. These results demonstrate how the PATH method can be used to identify specific construction operations and tasks that are ergonomically hazardous.
Collapse
Affiliation(s)
- B Buchholz
- Construction Occupational Health Project, Department of Work Environment, University of Massachusetts Lowell, One University Avenue, Lowell, MA 01854, USA
| | | | | | | | | |
Collapse
|
30
|
Daran JM, Dallies N, Thines-Sempoux D, Paquet V, François J. Genetic and biochemical characterization of the UGP1 gene encoding the UDP-glucose pyrophosphorylase from Saccharomyces cerevisiae. Eur J Biochem 1995; 233:520-30. [PMID: 7588797 DOI: 10.1111/j.1432-1033.1995.520_2.x] [Citation(s) in RCA: 98] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We report here that the open reading frame YKL248, previously identified during the systematic sequencing of yeast chromosome XI [Purnelle B., Skala, J., Van Dijck, L. & Goffeau, A. (1992) Yeast 8, 977-986] encodes UDP-glucose pyrophosphorylase (UGPase), the enzyme which catalyses the reversible formation of UDP-Glc from glucose 1-phosphate and UTP. Proof for this function come from sequence alignment of the YKL248 product with UGPase of other species, from complementation studies of an Escherichia coli galU mutant deficient in UGPase activity, and from overexpression studies. In particular, the amino acid sequence motifs involved in the binding of glucose 1-phosphate and UDP-Glc are entirely conserved between the yeast, bovine, human and potato tuber UGPases, and multi-copy expression of YKL248 resulted in a 40-fold increase in UGPase activity. This gene was, therefore, renamed UGP1. Gene disruption at the UGP1 locus in a diploid strain, followed by tetrad analysis, showed that UGPase is essential for cell viability. Functional analysis of UGP1 was, therefore, carried out by generating strains in which UGPase could be either overexpressed or depleted. This was done by generating haploid strains carrying either UGP1 on a multicopy vector or the chromosomal deletion of UGP1, and rescued by a vector bearing the wild-type gene under the control of the glucose-repressible galactose-inducible promoter. The effects of overproducing UGPase on the cell metabolism and morphology were carbon-source dependent. On glucose medium, the 40-fold increase of UGPase activity was restricted to a twofold increase in the concentration of glycogen and UDP-Glc, with no significant effect on growth. In contrast, on galactose, the 40-fold increase in UGPase activity was accompanied by several effects, including a threefold reduction of the growth rate, a 3-5-fold increase in the concentrations of UDP-Glc, UDP-Gal and galactose 1-phosphate, a higher sensitivity to calcofluor white and an increase in the degree of protein glycosylation. Depletion of UGPase activity was performed by transferring the mutant strains from galactose to glucose medium. Unexpectedly, growth of these mutants on glucose was as efficient as that of the control, although the mutants contained only 5-10% wild-type UGPase activity, and a growth defect could never been obtained, even after serial transfers of the mutants to a 10% glucose medium. However, the 10-fold reduction of UGPase activity induced a multi-budding pattern, a higher resistance to zymolyase, a slight increase in the calcofluor sensitivity and a decrease in the cell-wall beta-glucan content. All these alterations, induced by manipulating the UGP1 gene, are discussed in the context of the strategic position of UDP-Glc in yeast metabolism.
Collapse
Affiliation(s)
- J M Daran
- Centre de Bioingenierie Gilbert Durand, URA CNRS 544, Toulouse, France
| | | | | | | | | |
Collapse
|
31
|
Donner C, Rypens F, Paquet V, Cohen E, Delneste D, van Regemorter N, Vamos E, Avni F, Rodesch F. Cordocentesis for rapid karyotype: 421 consecutive cases. Fetal Diagn Ther 1995; 10:192-9. [PMID: 7639943 DOI: 10.1159/000264235] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [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: 01/26/2023]
Abstract
Between October 1985 and December 1993, 421 patients underwent fetal blood sampling for rapid karyotyping (426 samplings, 5 twin pregnancies). The aim of the study was to evaluate cordocentesis in terms of results, complications and additional information in this specific indication especially in case of abnormal pregnancy sonogram. The fetal loss rate possibly related to fetal blood sampling was 1.9%. Abnormal sonograms represented 91% of rapid karyotype indications. Chromosomal abnormalities were found in 9.5% of abnormal sonograms and in 16.9% of fetal structural anomalies (37 cases). The commonest chromosomal abnormality was trisomy 21 (11 cases). In conclusion, cordocentesis is a safe and reliable method for rapid karyotyping although it is associated with more risks than in other indications (congenital infections). The high rate of chromosomal abnormalities pleaded for ultrasonographic screening in a population usually not investigated by cytogenetic studies.
Collapse
Affiliation(s)
- C Donner
- Department of Obstetrics and Gynecology, Hôpital Erasme, Université Libre de Bruxelles, Belgium
| | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Paquet V, Myint M, Roque C, Soucaille P. Partitioning of pristinamycins in aqueous two-phase systems: A first step toward the development of antibiotic production by extractive fermentation. Biotechnol Bioeng 1994; 44:445-51. [DOI: 10.1002/bit.260440407] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
33
|
Loubiere P, Gros E, Paquet V, Lindley ND. Kinetics and physiological implications of the growth behaviour of Eubacterium limosum on glucose/methanol mixtures. ACTA ACUST UNITED AC 1992. [DOI: 10.1099/00221287-138-5-979] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
34
|
Paquet V, Croux C, Goma G, Soucaille P. Purification and characterization of the extracellular alpha-amylase from Clostridium acetobutylicum ATCC 824. Appl Environ Microbiol 1991; 57:212-8. [PMID: 8967771 PMCID: PMC182687 DOI: 10.1128/aem.57.1.212-218.1991] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.8] [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: 02/03/2023] Open
Abstract
The extracellular alpha-amylase (1,4-alpha-D-glucanglucanohydrolase; EC 3.2.1.1) from Clostridium acetobutylicum ATCC 824 was purified to homogeneity by anion-exchange chromatography (mono Q) and gel filtration (Superose 12). The enzyme had an isoelectric point of 4.7 and a molecular weight of 84,000, as estimated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. It was a monomeric protein, the 19-amino-acid N terminus of which displayed 42% homology with the Bacillus subtilis saccharifying alpha-amylase. The amino acid composition of the enzyme showed a high number of acidic and hydrophobic residues and only one cysteine residue per mole. The activity of the alpha-amylase was not stimulated by calcium ions (or other metal ions) or inhibited by EDTA, although the enzyme contained seven calcium atoms per molecule. alpha-Amylase activity on soluble starch was optimal at pH 5.6 and 45 degrees C. The alpha-amylase was stable at an acidic pH but very sensitive to thermal inactivation. It hydrolyzed soluble starch, with a Km of 3.6 g . liter-1 and a Kcat of 122 mol of reducing sugars . s-1 . mol-1. The alpha-amylase showed greater activity with high-molecular-weight substrates than with low-molecular-weight maltooligosaccharides, hydrolyzed glycogen and pullulan slowly, but did not hydrolyze dextran or cyclodextrins. The major end products of maltohexaose degradation were glucose, maltose, and maltotriose; maltotetraose and maltopentaose were formed as intermediate products. Twenty seven percent of the glucoamylase activity generally detected in the culture supernatant of C. acetobutylicum can be attributed to the alpha-amylase.
Collapse
Affiliation(s)
- V Paquet
- Département de Génie Biochimique et Alimentaire, Centre National de la Recherche Scientifique Unité Associée 544, Toulouse, France
| | | | | | | |
Collapse
|
35
|
Croux C, Paquet V, Goma G, Soucaille P. Purification and characterization of acidolysin, an acidic metalloprotease produced by Clostridium acetobutylicum ATCC 824. Appl Environ Microbiol 1990; 56:3634-42. [PMID: 2082818 PMCID: PMC185045 DOI: 10.1128/aem.56.12.3634-3642.1990] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [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: 12/30/2022] Open
Abstract
Acidolysin an extracellular protease produced by Clostridium acetobutylicum ATCC 824 was purified to homogeneity by anion-exchange chromatography with a recovery of 91%. The enzyme was a monomeric protein with a molecular weight of 44,000 as estimated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and an acidic isoelectric point of 3.3. Acidolysin was very sensitive to metal-chelating agents and phosphoramidon and was unaffected by sulfhydryl reagents. It was shown to be a calcium- and zinc-containing protease. It exhibited optimal activity against Azocoll at pH 5 and 45 degrees C. It was stable at low pH and heat labile above 50 degrees C. It exhibited specificity toward peptide bonds formed by the amino group of hydrophobic amino acids (isoleucine, leucine, and phenylalanine) and its NH2-terminal amino acid sequence showed a high degree of similarity with that of Bacillus subtilis neutral metalloprotease A. Acidolysin is the first phosphoramidon-sensitive, acidic zinc metalloprotease reported.
Collapse
Affiliation(s)
- C Croux
- Département de Génie Biochimique et Alimentaire, UA-Centre National de la Recherche Scientifique no. 544, Institut National des Sciences Appliquées, Toulouse, France
| | | | | | | |
Collapse
|
36
|
|
37
|
Aussenegg F, Gilly H, Paquet V. Fabry-perot etalon with evaporated schott glass as a spacer-layer. Appl Opt 1973; 12:2241-2242. [PMID: 20125767 DOI: 10.1364/ao.12.002241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
|