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Benzerga S, Michaux C, Calvo Lasso De Lavega E, Staub T. La tuberculose le grand mime. Rev Med Interne 2019. [DOI: 10.1016/j.revmed.2019.10.308] [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]
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Duquenne J, Mabalukwa J, Calvo E, Michaux C, Staub T. [A disseminated strongyloidiasis in a non immunocompromised patient]. Rev Med Liege 2018; 73:383-386. [PMID: 30113779] [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] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Strongyloidiasis is a parasitosis mainly located in tropical and subtropical regions. Its European incidence is increasing due to population migration. The symptomatology is variable, largely depending on the host immune status. The diagnosis may be challenging as a specific inquiry is needed. The disseminated status, called hyperinfection syndrome, is a life-threatening disease that might occur in immunosuppressed patients. The patient's chances for a successful outcome depend on a quick and specific management. The treatment is based on anthelminthic agents such as ivermectine or albendazole for which the dosage will vary according to the infection type.
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Affiliation(s)
- J Duquenne
- Service de Médecine interne, Pneumologie, CHU Sart Tilman, Liège, Belgique
| | - J Mabalukwa
- Service de Médecine interne, ULB, Bruxelles, Belgique
| | - E Calvo
- Service d'Infectiologie, Centre Hospitalier du Luxembourg, Luxembourg
| | - C Michaux
- Service d'Infectiologie, Centre Hospitalier du Luxembourg, Luxembourg
| | - T Staub
- Service d'Infectiologie, Centre Hospitalier du Luxembourg, Luxembourg
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Hérault JP, Bernat A, Roye F, Michaux C, Schaeffer P, Bono F, Petitou M, Herbert JM. Pharmacokinetics of New Synthetic Heparin Mimetics. Thromb Haemost 2017. [DOI: 10.1055/s-0037-1613122] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
SummaryPharmacokinetics of oligosaccharides displaying various affinities for antithrombin (AT) allowed us to show that there was a close relationship between the plasma half-life of these antithrombotic oligosaccharides and their affinity for AT. Recently, we have described new heparin mimetics comprising an AT binding domain and a thrombin binding domain separated by a neutral methylated saccharide sequence. These compounds displayed strong anti-Xa and anti-IIA activities and, in contrast to heparin, escaped neutralisation by platelet factor 4. The aim of this work was to compare the pharmacokinetics of several of these heparin mimetics in rats. These compounds differed by their length, charge and affinity for AT (AT-binding domain). The results obtained indicate that the prolongation of the AT binding domain did not modify significantly their affinities for AT. However, an increase in the number of charges leads to a decrease in the half-life. When a methylated spacer was added in order to minimise the non-specific interactions to other proteins, half-lives of the heparin mimetic were in the same range than that of the pentasaccharide used as an AT binding domain.In conclusion, this study shows the influence of the charge of the oligosaccharides on their pharmacokinetics and underlines the importance of minimising their non-specific binding to plasma proteins in order to obtain compounds with predictive pharmacokinetics.
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Fischer A, Etienne V, Schmit JC, Arendt V, Staub T, Hemmer R, Michaux C, Gantenbein M, Chioti A. 1986-2016: 30 years of pregnancy outcomes surveillance in HIV-Positive women in Luxembourg. Eur J Public Health 2016. [DOI: 10.1093/eurpub/ckw167.028] [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: 10/20/2022] Open
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Michaux C, Roussel G, Lopes-Rodrigues M, Matagne A, Perpète E. Unravelling the mechanisms of a protein refolding process based on the association of detergents and co-solvents. J Pept Sci 2016; 22:485-91. [DOI: 10.1002/psc.2893] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Revised: 03/30/2016] [Accepted: 04/05/2016] [Indexed: 02/03/2023]
Affiliation(s)
- C. Michaux
- Laboratory of Physical Chemistry of Biomolecules, Chemistry Department; University of Namur; 61 rue de Bruxelles 5000 Namur Belgium
| | - G. Roussel
- Laboratory of Physical Chemistry of Biomolecules, Chemistry Department; University of Namur; 61 rue de Bruxelles 5000 Namur Belgium
| | - M. Lopes-Rodrigues
- Laboratory of Physical Chemistry of Biomolecules, Chemistry Department; University of Namur; 61 rue de Bruxelles 5000 Namur Belgium
| | - A. Matagne
- Laboratory of Enzymology and Protein Folding, Centre for Protein Engineering, Institut de Chimie B6; University of Liège; 7 Place du 20 août 4000 Liège Belgium
| | - E.A. Perpète
- Laboratory of Physical Chemistry of Biomolecules, Chemistry Department; University of Namur; 61 rue de Bruxelles 5000 Namur Belgium
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Hofstra LM, Sauvageot N, Albert J, Alexiev I, Garcia F, Struck D, Van de Vijver DAMC, Åsjö B, Beshkov D, Coughlan S, Descamps D, Griskevicius A, Hamouda O, Horban A, Van Kasteren M, Kolupajeva T, Kostrikis LG, Liitsola K, Linka M, Mor O, Nielsen C, Otelea D, Paraskevis D, Paredes R, Poljak M, Puchhammer-Stöckl E, Sönnerborg A, Staneková D, Stanojevic M, Van Laethem K, Zazzi M, Zidovec Lepej S, Boucher CAB, Schmit JC, Wensing AMJ, Puchhammer-Stockl E, Sarcletti M, Schmied B, Geit M, Balluch G, Vandamme AM, Vercauteren J, Derdelinckx I, Sasse A, Bogaert M, Ceunen H, De Roo A, De Wit S, Echahidi F, Fransen K, Goffard JC, Goubau P, Goudeseune E, Yombi JC, Lacor P, Liesnard C, Moutschen M, Pierard D, Rens R, Schrooten Y, Vaira D, Vandekerckhove LPR, Van den Heuvel A, Van Der Gucht B, Van Ranst M, Van Wijngaerden E, Vandercam B, Vekemans M, Verhofstede C, Clumeck N, Van Laethem K, Beshkov D, Alexiev I, Lepej SZ, Begovac J, Kostrikis L, Demetriades I, Kousiappa I, Demetriou V, Hezka J, Linka M, Maly M, Machala L, Nielsen C, Jørgensen LB, Gerstoft J, Mathiesen L, Pedersen C, Nielsen H, Laursen A, Kvinesdal B, Liitsola K, Ristola M, Suni J, Sutinen J, Descamps D, Assoumou L, Castor G, Grude M, Flandre P, Storto A, Hamouda O, Kücherer C, Berg T, Braun P, Poggensee G, Däumer M, Eberle J, Heiken H, Kaiser R, Knechten H, Korn K, Müller H, Neifer S, Schmidt B, Walter H, Gunsenheimer-Bartmeyer B, Harrer T, Paraskevis D, Hatzakis A, Zavitsanou A, Vassilakis A, Lazanas M, Chini M, Lioni A, Sakka V, Kourkounti S, Paparizos V, Antoniadou A, Papadopoulos A, Poulakou G, Katsarolis I, Protopapas K, Chryssos G, Drimis S, Gargalianos P, Xylomenos G, Lourida G, Psichogiou M, Daikos GL, Sipsas NV, Kontos A, Gamaletsou MN, Koratzanis G, Sambatakou H, Mariolis H, Skoutelis A, Papastamopoulos V, Georgiou O, Panagopoulos P, Maltezos E, Coughlan S, De Gascun C, Byrne C, Duffy M, Bergin C, Reidy D, Farrell G, Lambert J, O'Connor E, Rochford A, Low J, Coakely P, O'Dea S, Hall W, Mor O, Levi I, Chemtob D, Grossman Z, Zazzi M, de Luca A, Balotta C, Riva C, Mussini C, Caramma I, Capetti A, Colombo MC, Rossi C, Prati F, Tramuto F, Vitale F, Ciccozzi M, Angarano G, Rezza G, Kolupajeva T, Vasins O, Griskevicius A, Lipnickiene V, Schmit JC, Struck D, Sauvageot N, Hemmer R, Arendt V, Michaux C, Staub T, Sequin-Devaux C, Wensing AMJ, Boucher CAB, van de Vijver DAMC, van Kessel A, van Bentum PHM, Brinkman K, Connell BJ, van der Ende ME, Hoepelman IM, van Kasteren M, Kuipers M, Langebeek N, Richter C, Santegoets RMWJ, Schrijnders-Gudde L, Schuurman R, van de Ven BJM, Åsjö B, Kran AMB, Ormaasen V, Aavitsland P, Horban A, Stanczak JJ, Stanczak GP, Firlag-Burkacka E, Wiercinska-Drapalo A, Jablonowska E, Maolepsza E, Leszczyszyn-Pynka M, Szata W, Camacho R, Palma C, Borges F, Paixão T, Duque V, Araújo F, Otelea D, Paraschiv S, Tudor AM, Cernat R, Chiriac C, Dumitrescu F, Prisecariu LJ, Stanojevic M, Jevtovic D, Salemovic D, Stanekova D, Habekova M, Chabadová Z, Drobkova T, Bukovinova P, Shunnar A, Truska P, Poljak M, Lunar M, Babic D, Tomazic J, Vidmar L, Vovko T, Karner P, Garcia F, Paredes R, Monge S, Moreno S, Del Amo J, Asensi V, Sirvent JL, de Mendoza C, Delgado R, Gutiérrez F, Berenguer J, Garcia-Bujalance S, Stella N, de Los Santos I, Blanco JR, Dalmau D, Rivero M, Segura F, Elías MJP, Alvarez M, Chueca N, Rodríguez-Martín C, Vidal C, Palomares JC, Viciana I, Viciana P, Cordoba J, Aguilera A, Domingo P, Galindo MJ, Miralles C, Del Pozo MA, Ribera E, Iribarren JA, Ruiz L, de la Torre J, Vidal F, Clotet B, Albert J, Heidarian A, Aperia-Peipke K, Axelsson M, Mild M, Karlsson A, Sönnerborg A, Thalme A, Navér L, Bratt G, Karlsson A, Blaxhult A, Gisslén M, Svennerholm B, Bergbrant I, Björkman P, Säll C, Mellgren Å, Lindholm A, Kuylenstierna N, Montelius R, Azimi F, Johansson B, Carlsson M, Johansson E, Ljungberg B, Ekvall H, Strand A, Mäkitalo S, Öberg S, Holmblad P, Höfer M, Holmberg H, Josefson P, Ryding U. Transmission of HIV Drug Resistance and the Predicted Effect on Current First-line Regimens in Europe. Clin Infect Dis 2015; 62:655-663. [PMID: 26620652 PMCID: PMC4741360 DOI: 10.1093/cid/civ963] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Accepted: 11/06/2015] [Indexed: 11/13/2022] Open
Abstract
Transmitted human immunodeficiency virus drug resistance in Europe is stable at around 8%. The impact of baseline mutation patterns on susceptibility to antiretroviral drugs should be addressed using clinical guidelines. The impact on baseline susceptibility is largest for nonnucleoside reverse transcriptase inhibitors. Background. Numerous studies have shown that baseline drug resistance patterns may influence the outcome of antiretroviral therapy. Therefore, guidelines recommend drug resistance testing to guide the choice of initial regimen. In addition to optimizing individual patient management, these baseline resistance data enable transmitted drug resistance (TDR) to be surveyed for public health purposes. The SPREAD program systematically collects data to gain insight into TDR occurring in Europe since 2001. Methods. Demographic, clinical, and virological data from 4140 antiretroviral-naive human immunodeficiency virus (HIV)–infected individuals from 26 countries who were newly diagnosed between 2008 and 2010 were analyzed. Evidence of TDR was defined using the WHO list for surveillance of drug resistance mutations. Prevalence of TDR was assessed over time by comparing the results to SPREAD data from 2002 to 2007. Baseline susceptibility to antiretroviral drugs was predicted using the Stanford HIVdb program version 7.0. Results. The overall prevalence of TDR did not change significantly over time and was 8.3% (95% confidence interval, 7.2%–9.5%) in 2008–2010. The most frequent indicators of TDR were nucleoside reverse transcriptase inhibitor (NRTI) mutations (4.5%), followed by nonnucleoside reverse transcriptase inhibitor (NNRTI) mutations (2.9%) and protease inhibitor mutations (2.0%). Baseline mutations were most predictive of reduced susceptibility to initial NNRTI-based regimens: 4.5% and 6.5% of patient isolates were predicted to have resistance to regimens containing efavirenz or rilpivirine, respectively, independent of current NRTI backbones. Conclusions. Although TDR was highest for NRTIs, the impact of baseline drug resistance patterns on susceptibility was largest for NNRTIs. The prevalence of TDR assessed by epidemiological surveys does not clearly indicate to what degree susceptibility to different drug classes is affected.
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Affiliation(s)
- L Marije Hofstra
- Luxembourg Institute of Health, Luxembourg.,Department of Virology, University Medical Center Utrecht, The Netherlands
| | | | - Jan Albert
- Karolinska Institute, Solna.,Karolinska University Hospital, Stockholm, Sweden
| | - Ivailo Alexiev
- National Center of Infectious and Parasitic Diseases, Sofia, Bulgaria
| | - Federico Garcia
- Complejo Hospitalario Universitario de Granada, Instituto de Investigación IBS Granada; on behalf of Cohorte de Adultos de la Red de Investigación en SIDA, Spain
| | | | | | | | - Danail Beshkov
- National Center of Infectious and Parasitic Diseases, Sofia, Bulgaria
| | | | - Diane Descamps
- AP-HP Groupe hospitalier Bichat-Claude Bernard, IAME INSERM UMR 1137, Université Paris Diderot Sorbonne Paris Cité, Paris, France
| | | | | | | | | | | | | | - Kirsi Liitsola
- Department of Infectious Diseases, National Institute for Health and Welfare, Helsinki, Finland
| | - Marek Linka
- National Reference Laboratory for HIV/AIDS, National Institute of Public Health, Prague, Czech Republic
| | - Orna Mor
- National HIV Reference Laboratory, Chaim Sheba Medical Center, Tel-Hashomer, Israel
| | | | - Dan Otelea
- National Institute for Infectious Diseases "Prof. dr. Matei Bals", Bucharest, Romania
| | | | | | - Mario Poljak
- Faculty of Medicine, Slovenian HIV/AIDS Reference Centre, University of Ljubljana, Slovenia
| | | | - Anders Sönnerborg
- Karolinska Institute, Solna.,Karolinska University Hospital, Stockholm, Sweden
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Damoiseaux C, Merveille AC, Krafft E, Da Costa AM, Gomart S, Jespers P, Michaux C, Clercx C, Verhoeven C, Mc Entee K. Effect of physiological determinants and cardiac disease on plasma adiponectin concentrations in dogs. J Vet Intern Med 2014; 28:1738-45. [PMID: 25311942 PMCID: PMC4895643 DOI: 10.1111/jvim.12433] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 06/10/2014] [Accepted: 07/14/2014] [Indexed: 11/27/2022] Open
Abstract
Background In humans, a high concentration of adiponectin is associated with a favorable cardiovascular risk profile whereas, in patients with heart failure (HF), a high concentration of adiponectin is associated with a less favorable prognosis. Hypothesis/Objectives To evaluate the physiological determinants of plasma adiponectin concentration in dogs and the influence of heart disease, myxomatous mitral valve disease (MMVD), and dilated cardiomyopathy (DCM). Animals One hundred and fourteen client‐owned dogs and 9 Beagles from the research colony of the Clinical Veterinary Unit of the University of Liège. Methods We prospectively measured circulating adiponectin concentration in healthy control dogs (n = 77), dogs with MMVD (n = 22) and dogs with DCM (n = 15) of various degrees of severity. Diagnosis was confirmed by Doppler echocardiography. Plasma adiponectin concentration was measured by a canine‐specific sandwich ELISA kit. Results An analysis of covariance showed an association between adiponectin concentration and age, neuter status, and heart disease. No association between adiponectin concentration and class of HF, sex, body condition score, body weight, circadian rhythm, or feeding was found. Plasma adiponectin concentration was negatively correlated with age (P = .001). Adiponectin was lower in neutered (P = .008) compared to intact dogs. Circulating adiponectin concentration was increased in dogs with DCM compared to healthy dogs (P = .018) and to dogs with MMVD (P = .014). Conclusions and Clinical Importance Age and neutering negatively influence circulating adiponectin concentration. Plasma adiponectin concentration increased in dogs with DCM. Additional research is required to investigate if this hormone is implicated in the pathophysiology of DCM and associated with clinical outcome.
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Affiliation(s)
- C Damoiseaux
- Department of Small Animal Clinical Sciences, Faculty of Veterinary Medicine, Université de Liège, Liège, Belgium
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Moula N, Philippe F, Antoine-Moussiaux N, Leroy P, Michaux C. Estimation of inbreeding rates and extinction risk of forty one Belgian chicken breeds in 2005 and 2010. Arch zootec 2014. [DOI: 10.4321/s0004-05922014000200018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Servat A, Herr J, Picard-Meyer E, Schley L, Harbusch C, Michaux C, Pir J, Robardet E, Engel E, Cliquet F. First isolation of a rabid bat infected with European bat lyssavirus in Luxembourg. Zoonoses Public Health 2013; 62:7-10. [PMID: 24373212 DOI: 10.1111/zph.12095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Indexed: 11/27/2022]
Abstract
Rabid bats are regularly reported in Europe, especially in countries that have implemented a bat surveillance network. In May 2013, bat rabies was evidenced for the first time in Luxembourg (southern city of Differdange). The rabies virus, an EBLV-1b strain, was diagnosed in a serotine bat that bit a 29-year-old male person while he was asleep. The man received rapidly a post-exposure RABV treatment and was put under strict medical supervision.
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Affiliation(s)
- A Servat
- French Agency for Food, Environmental and Occupational Health Safety (Anses), Nancy Laboratory for Rabies and Wildlife, WHO Collaborating Centre for Research and Management in Zoonoses Control, OIE Reference Laboratory for Rabies, European Union Reference Laboratory for Rabies, European Union Reference Laboratory for Rabies Serology. Technopôle Agricole et Vétérinaire, Malzéville, France
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Michaux C, Randrianasolo D, Vandenhende MA, Hessamfar M, Morlat P, Bonnet F. Purpura thrombotique thrombocytopénique induit par l’interféron chez une femme co-infectée par le VIH et le VHC. Rev Med Interne 2013; 34:773-5. [DOI: 10.1016/j.revmed.2013.03.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Revised: 02/26/2013] [Accepted: 03/08/2013] [Indexed: 11/26/2022]
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Abstract
The Mucha-Habermann disease is an inflammatory disease of the skin and is a variant of pityriasis lichenoides et varioliformis acuta. We describe the case of a 64-years-old woman who was admitted for erysipelas of the face. Despite treatment, evolution was marked by the appearance of a necrotising ulcerative area in the centre of the erysipelas associated with local oedema and headache. A skin biopsy revealed a pityriasis lichenoides et varioliformis acuta. Corticosteroids led to a rapid stabilisation of lesions, and after 6 months the patient shows only a small area of frontal hypopigmentation. The aetiology remains uncertain. There is no established standard treatment. We would like to draw attention of the medical and surgical specialists to this rare disease. The diagnosis should be considered in a necrotic lesion associated with rapid expansion of systemic and peripheral cutaneous signs. Diagnosis must be considered to avoid unnecessary debridement and extensive scars.
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Affiliation(s)
- F-X Lejuste
- Service de Chirurgie Plastique Reconstructrice et Esthétique, Centre Hospitalier de Luxembourg, Luxembourg, Luxembourg
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Moula N, Philippe FX, Antoine-Moussiaux N, Leroy P, Michaux C. Estimación de tasa de consanguinidad y riesgo de extinción en cuarenta y una razas Belgas de pollos en 2005 y 2010. ARCH ZOOTEC 2013. [DOI: 10.21071/az.v63i242.556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
En Bélgica, y generalmente en Europa, la posición dominante de estirpes comerciales altamente productivas, especializadas en la producción de carne o huevos, amenaza de extinción a las razas locales tradicionales. Se ha realizado, en 2005 y 2010, un seguimiento de las tasas de consanguinidad de razas de gallinas belgas. Unas cuarenta razas han sido consideradas. Las razas belgas de gallinas se encuentran abrumado-ramente en peligro de extinción a causa del escaso número de individuos en cada raza. Para cada una de las razas fueron considerados varios criterios: estado de riesgo, relación reproductores machos/reproductores hembra, tamaño efectivo de población, relación tamaño efectivo/tamaño actual y tasa de consanguinidad.
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Hommell-Fontaine J, Isaac S, Passot G, Bancel B, Michaux C, Gilly FN, Glehen O, Berger F. Mésothéliome malin péritonéal traité par chirurgie de cytoréduction et chimiohyperthermie intrapéritonéale : étude des facteurs pronostiques dans une série unicentrique. Ann Pathol 2012. [DOI: 10.1016/j.annpat.2012.09.042] [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: 10/27/2022]
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Hanset R, Michaux C. On the genetic determinism of muscular hypertrophy in the Belgian White and Blue cattle breed. II. Population data. ACTA ACUST UNITED AC 2012; 17:369-86. [PMID: 22879214 DOI: 10.1186/1297-9686-17-3-369] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Roussel G, Matagne A, De Bolle X, Perpète E, Michaux C. Purification, refolding and characterization of the trimeric Omp2a outer membrane porin from Brucella melitensis. Protein Expr Purif 2012; 83:198-204. [DOI: 10.1016/j.pep.2012.04.003] [Citation(s) in RCA: 10] [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] [Received: 01/04/2012] [Revised: 03/29/2012] [Accepted: 04/02/2012] [Indexed: 10/28/2022]
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Gomez N, Matheeussen V, Damoiseaux C, Tamborini A, Merveille AC, Jespers P, Michaux C, Clercx C, De Meester I, Mc Entee K. Effect of heart failure on dipeptidyl peptidase IV activity in plasma of dogs. J Vet Intern Med 2012; 26:929-34. [PMID: 22594653 DOI: 10.1111/j.1939-1676.2012.00942.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2011] [Revised: 02/27/2012] [Accepted: 04/02/2012] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND In congestive heart failure (HF), plasma B-type natriuretic peptide (BNP) seems devoid of biological effectiveness. BNP(1-32) could be truncated into BNP(3-32) by dipeptidyl peptidase IV (DPP4), and BNP(3-32) has reduced biological activities. HYPOTHESIS Increased DPP4 activity is associated with pathophysiology of HF. ANIMALS One hundred twenty-eight client-owned dogs and 9 experimental Beagles from the Clinical Veterinary Unit of the University of Liège. METHODS We prospectively measured plasma DPP4 activity in 5 groups of dogs: normal growing dogs (n = 21), normal adult dogs (n = 60), healthy Beagle (n = 9), dogs with myxomatous mitral valve disease (n = 35), and dogs with dilated cardiomyopathy (n = 12). The final diagnosis and the severity of HF were determined by Doppler echocardiography. Plasma DPP4 activity was measured kinetically by a fluorimetric method. RESULTS In growing dogs, DPP4 activity was higher than in adults (P < .001) and inversely correlated with age (r = -0.57, P < .01). In adults, DPP4 activity increased linearly with body weight (r = 0.39, P < .01), but there was no influence of age or sex. No effect of the circadian rhythm was noted. DPP4 activity was significantly higher in HF ISACHC I (16.3 ± 1.14 U/L) compared with healthy adults (12.4 ± 0.65 U/L, P < .05) and HF ISACHC III (11.0 ± 1.50 U/L, P < .05). Mean DPP4 activity in ISACHC II was 15.1 ± 1.4 U/L. CONCLUSION AND CLINICAL IMPORTANCE We did not find evidence that plasma DPP4 activity is responsible for the "BNP resistance" in overt congestive HF, but it may be implicated in early stages.
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Affiliation(s)
- N Gomez
- Laboratory of Physiology, Faculty of Medicine, Université de Liège, Liège, Belgium
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Rakotoarivelo RA, Labourré G, Wille H, Michaux C, Vandenhende MA, Lacoste D, Bernard N, Morlat P, Bonnet F. Réactions paradoxales sous antituberculeux chez des patients non infectés par le VIH : une difficulté diagnostique et thérapeutique. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.03.184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zoa-Mboé A, Michaux C, Detilleux JC, Kebers C, Farnir FP, Leroy PL. Effects of parity, breed, herd-year, age, and month of kidding on the milk yield and composition of dairy goats in Belgium. J Anim Breed Genet 2011; 114:201-13. [DOI: 10.1111/j.1439-0388.1997.tb00506.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kafidi N, Leroy P, Michaux C, François A. Relationship between milk production and current calving interval in Belgian Black and White breed1. J Anim Breed Genet 2011. [DOI: 10.1111/j.1439-0388.1992.tb00388.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Cerón-Carrasco JP, Requena A, Perpète EA, Michaux C, Jacquemin D. Theoretical study of the tautomerism in the one-electron oxidized guanine-cytosine base pair. J Phys Chem B 2011; 114:13439-45. [PMID: 20883043 DOI: 10.1021/jp101711z] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Ionizing radiation on DNA mainly generates one-electron oxidized guanine-cytosine base pair (G(+·):C), and in the present paper we study all possible tautomers of G(+·):C by using ab initio approaches. Our calculations reveal that the tautomeric equilibrium follows a peculiar path, characterized by a stepwise mechanism: first the proton in the central hydrogen bond N1(G)-H1-N3(C) migrates from guanine to cytosine, and then the cytosine cation releases one proton from its amino group. During this second step, water acts as a proton acceptor, localizing the positive charge on one of the water molecules interacting with the guanine radical. In agreement with experimental findings, the computed energy barriers show that the deprotonation of the cytosine cation is the speed-limiting step in the tautomeric equilibrium. The influence of the number of water molecules incorporated in the theoretical model is analyzed in detail. The evolution of electronic properties along the reaction path is also discussed on the basis of partial atomic charges and spin density distributions. This work demonstrates that water indeed plays a crucial role in the tautomeric equilibra of base pairs.
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Affiliation(s)
- J P Cerón-Carrasco
- Departamento de Química Física Facultad de Química, Universidad de Murcia, Campus de Espinardo, 30100 Murcia, Spain.
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Vandenhende M, Michaux C, Bentaberry F, Lacoste D, Bernard N, Morlat P, Bonnet F. Anakinra et syndrome de Schnitzler. Rev Med Interne 2010. [DOI: 10.1016/j.revmed.2010.10.182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Labouré G, Wille H, Rakotoarivelo R, Michaux C, Vandenhende MA, Bernard N, Lacoste D, Milpied N, Morlat P, Bonnet F. Une LLC à se taper la tête…. Rev Med Interne 2010. [DOI: 10.1016/j.revmed.2010.10.313] [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: 10/18/2022]
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Michaux C, Vandenhende MA, Bernard N, Lacoste D, Bonnet F, Morlat P. Une réaction paradoxale sous traitement antituberculeux. Rev Med Interne 2010. [DOI: 10.1016/j.revmed.2010.03.231] [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: 10/19/2022]
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24
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Vandenhende MA, Michaux C, Morlat P, Bonnet F. Angio-œdème par hyperactivité des kininogénases. Difficultés de prise en charge thérapeutique. Rev Med Interne 2010. [DOI: 10.1016/j.revmed.2010.03.121] [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: 10/19/2022]
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Michaux C, Sichem-Reynaert R, Peeters G, Hanset R. Plasma growth hormone (GH) level in double-muscled and conventional bulls during the first year of life1. ACTA ACUST UNITED AC 2010. [DOI: 10.1111/j.1439-0388.1981.tb00343.x] [Citation(s) in RCA: 2] [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: 12/01/2022]
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Michaux C, Beckers JF, de Fonseca M, Hanset R. Plasma insulin level in double-muscled and conventional bulls during the first year of life1. ACTA ACUST UNITED AC 2010. [DOI: 10.1111/j.1439-0388.1981.tb00354.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Dogné JM, Wouters J, Rolin S, Michaux C, Pochet L, Durant F, Delarge J, Masereel B. Design, synthesis and biological evaluation of a sulfonylcyanoguanidine as thromboxane A2 receptor antagonist and thromboxane synthase inhibitor. J Pharm Pharmacol 2010; 53:669-80. [PMID: 11370706 DOI: 10.1211/0022357011775992] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Abstract
The synthesis and the structure of N-isopropyl-N′-[2-(3′-methylphenylamino)-5-nitrobenzenesulfonyl] urea (14) was drawn from two thromboxane A2 receptor antagonists structurally related to torasemide. Compound 14 showed an IC50 value of 22 nm for the thromboxane A2 (TXA2) receptor of human washed platelets. Compound 14 prevented platelet aggregation induced by arachidonic acid (0.6 mm) and U-46619 (1 μm) with an IC50 value of 0.45 and 0.15 μm, respectively. Moreover, 14 relaxed the rat isolated aorta and guinea-pig trachea precontracted by U-46619, a TXA2 agonist. Its efficacy (IC50) was 20.4 and 5.47 nm, respectively. Finally, 14 (1 μm) completely inhibited TXA2 synthase of human platelets. The pKa value and the crystallographic data of 14 were determined and used to propose an interaction model between the TXA2 antagonists related to torasemide and their receptor.
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Affiliation(s)
- J M Dogné
- Department of Pharmacy, University of Namur, Belgium
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Lacassie S, Michaux C, Pedeboscq S, Louis I, Vandenhende M, Roger-Schmeltz J, Bernard N, Mercie P, Hessamfar M, Bonnet F, Morlat P, Pometan JP. Impact de la non observance au ritonavir, utilisé comme « booster » des antiprotéases du VIH, sur la réponse virologique au traitement. Rev Med Interne 2009. [DOI: 10.1016/j.revmed.2009.10.293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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33
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Deti K, Vandenhende M, Dauchy F, Michaux C, Geffard S, Lazaro E, Cazanave C, Bruyand M, Roger-Schmeltz J, Bonnet F, Chene G, Morlat P. Incidence et facteurs de risque de l’insuffisance rénale chronique chez les patients infectés par le VIH : étude de cohorte de 2613 patients (2004–2008). Rev Med Interne 2009. [DOI: 10.1016/j.revmed.2009.10.077] [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: 10/20/2022]
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Geneviève M, Vandenhende MA, Bernard N, Michaux C, Combe C, Lacoste D, Bonnet F, Morlat P. Une néphropathie lupique liée à un DICV d’évolution favorable sous immunoglobulines intraveineuses. Rev Med Interne 2009. [DOI: 10.1016/j.revmed.2009.10.357] [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: 10/20/2022]
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Cerón-Carrasco JP, Requena A, Zúñiga J, Michaux C, Perpète EA, Jacquemin D. Intermolecular Proton Transfer in Microhydrated Guanine−Cytosine Base Pairs: a New Mechanism for Spontaneous Mutation in DNA. J Phys Chem A 2009; 113:10549-56. [DOI: 10.1021/jp906551f] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
| | | | | | - C. Michaux
- Laboratorie de Chimie Biologique Structurale, Facultés Universitaires Notre-Dame de la Paix, Rue de Bruxelles, 61, 5000 Namur, Belgium
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Cerón-Carrasco JP, Requena A, Michaux C, Perpète EA, Jacquemin D. Effects of Hydration on the Proton Transfer Mechanism in the Adenine−Thymine Base Pair. J Phys Chem A 2009; 113:7892-8. [DOI: 10.1021/jp900782h] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
| | | | - C. Michaux
- Laboratorie de Chimie Biologique Structurale, Facultés Universitaires Notre-Dame de la Paix Rue de Bruxelles, 61. 5000 Namur, Belgium
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Vandenhende M, Loizeau C, Michaux C, Lacoste D, Bernard N, Papaioannou G, Bonnet F, Morlat P. Le foramen ovale perméable, une complication méconnue des cardiopathies carcinoïdes. Rev Med Interne 2009. [DOI: 10.1016/j.revmed.2009.03.276] [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: 10/20/2022]
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38
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Michaux C, Wouters J, Jacquemin D, Perpète EA. A theoretical investigation of microhydration of cationic amino acids. Chem Cent J 2009. [DOI: 10.1186/1752-153x-3-s1-p50] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Vandenhende M, Michaux C, Lacoste D, Bernard N, Bonnet F, Maugein J, Morlat P. Un « lâcher de ballons » facilement curable : une nocardiose pulmonaire. Rev Med Interne 2009. [DOI: 10.1016/j.revmed.2009.03.330] [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: 10/20/2022]
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Lariviere JM, Michaux C, Farnir F, Detilleux J, Verleyen V, Leroy P. Reproductive Performance of the Ardennaise Chicken Breed under Traditional and Modern Breeding Management Systems. ACTA ACUST UNITED AC 2009. [DOI: 10.3923/ijps.2009.446.451] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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41
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Michaux C, Parrens M, Lacoste D, Bentaberry F, Pellegrin J, Bernard N, Neau D, Mercié P, de Mascarel A, Morlat P, Bonnet F. Maladie de Hodgkin et VIH, étude anatomopathologie et immunohistochimique. Rev Med Interne 2008. [DOI: 10.1016/j.revmed.2008.10.233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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42
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Michaux C, Fieschi C, Bassez G, Prinseau J, Baglin A, Hanslik T. Hypogammaglobulinémie symptomatique dans la maladie de Steinert. Rev Med Interne 2008. [DOI: 10.1016/j.revmed.2008.10.152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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43
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Kahn V, Michaux C, Greib C, Caubet C, Pellegrin JL, Viallard JF, Duffau P. Une polymyosite toxique. Rev Med Interne 2007. [DOI: 10.1016/j.revmed.2007.03.235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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44
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Lorléac'H A, Greib C, Michaux C, Viallard J, Pellegrin J, Duffau P. Enthésopathie pelvienne, bursite trochantérienne et maladie de Horton. Rev Med Interne 2007. [DOI: 10.1016/j.revmed.2007.03.291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Lejeune JP, Franck T, Gangl M, Schneider N, Michaux C, Deby-Dupont G, Serteyn D. Plasma concentration of insulin-like growth factor I (IGF-I) in growing Ardenner horses suffering from juvenile digital degenerative osteoarthropathy. Vet Res Commun 2007; 31:185-95. [PMID: 17216321 DOI: 10.1007/s11259-006-3385-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/20/2005] [Indexed: 11/26/2022]
Abstract
Degenerative osteoarthropathy resulting in a reduced active lifespan was observed in Ardenner horses. In the context of joint biology, insulin-like growth factor I (IGF-I) is a potential candidate to affect the anabolism of cartilage matrix molecules. A group of 30 Ardenner horses reared under standardized conditions from weaning were evaluated periodically from 15 to 28 months of age to detect the early manifestations of the disease. At the end of this period, horses were classified in two pathological groups related to the degree of interphalangeal degenerative osteoarthropathy based on clinical and radiographic evaluations: healthy (46.7%) and pathological (53.3%) horses. Seven sequential blood samples were taken from each horse (during the evaluation period) to study the variation of IGF-I plasma concentration. We tested the variations of the IGF-I plasma concentration during growth, and the effect of sex and of pathological classes. Significant variations were observed during the research period, with a maximum value corresponding to spring and a minimum in autumn. A significant reduction of the IGF-I plasma concentration was also observed in the pathological horses (433.5 +/- 19.5 ng/ml) compared to the healthy horses (493.9 +/- 18.2 ng/ml). An alteration in the level of this growth factor could induce a disregulation of the mechanisms involved in the local control of joint and bone tissue development.
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Affiliation(s)
- J-Ph Lejeune
- Centre Européen du Cheval, Mont-le-Soie, Vielsalm.
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Poncelet L, Deltenre P, Coppens A, Michaux C, Coussart E. Brain stem auditory potentials evoked by clicks in the presence of high-pass filtered noise in dogs. Res Vet Sci 2006; 80:167-74. [PMID: 16002109 DOI: 10.1016/j.rvsc.2005.05.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2004] [Revised: 03/09/2005] [Accepted: 05/03/2005] [Indexed: 10/25/2022]
Abstract
This study evaluates the effects of a high-frequency hearing loss simulated by the high-pass-noise masking method, on the click-evoked brain stem-evoked potentials (BAEP) characteristics in dogs. BAEP were obtained in response to rarefaction and condensation click stimuli from 60 dB normal hearing level (NHL, corresponding to 89 dB sound pressure level) to wave V threshold, using steps of 5 dB in eleven 58 to 80-day-old Beagle puppies. Responses were added, providing an equivalent to alternate polarity clicks, and subtracted, providing the rarefaction-condensation potential (RCDP). The procedure was repeated while constant level, high-pass filtered (HPF) noise was superposed to the click. Cut-off frequencies of the successively used filters were 8, 4, 2 and 1 kHz. For each condition, wave V and RCDP thresholds, and slope of the wave V latency-intensity curve (LIC) were collected. The intensity range at which RCDP could not be recorded (pre-RCDP range) was calculated. Compared with the no noise condition, the pre-RCDP range significantly diminished and the wave V threshold significantly increased when the superposed HPF noise reached the 4 kHz area. Wave V LIC slope became significantly steeper with the 2 kHz HPF noise. In this non-invasive model of high-frequency hearing loss, impaired hearing of frequencies from 8 kHz and above escaped detection through click BAEP study in dogs. Frequencies above 13 kHz were however not specifically addressed in this study.
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Affiliation(s)
- L Poncelet
- Anatomy and Embryology, Faculty of Medicine, Free University of Brussels, 808 route de Lennik, B-1070 Bruxelles, Belgium.
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Gbangboche AB, Youssao AKI, Senou M, Adamou-Ndiaye M, Ahissou A, Farnir F, Michaux C, Abiola FA, Leroy PL. Examination of non-genetic factors affecting the growth performance of djallonke sheep in soudanian zone at the Okpara breeding farm of Benin. Trop Anim Health Prod 2006; 38:55-64. [PMID: 17405629 DOI: 10.1007/s11250-006-4231-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [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: 10/24/2022]
Abstract
A study was carried out at the Okpara breeding farm in Benin. Records on 558 lambs of the Djallonke sheep breed, born from 1997 to 2000, were used to determine the weekly growth curve from birth up to 119 days of age. Non-genetic factors affecting lamb weights at birth and at 30, 60, 90 and 120 days and average daily gains from 0 to 30 days, from 0 to 60 days, from 0 to 90 days and from 0 to 120 days were investigated. A linear model comprising the fixed effects of birth season, birth year, parity number of ewe and sex of lambs was used for analysis of variance by least squares. All fixed effects were significant for weight at 30 and 60 days and average daily gains at 30 days, with the exception of the parity of the ewe for birth weight, weight and average daily gain at 90 days. All fixed effects tended to cancel out for weight and average daily gains by 120 days. Lambs born in the dry season were the heaviest. Single lambs and male lambs were heavier than twins and females. Lambs from ewes of 3rd and 4th parity were heavier, with higher, average daily gains.
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Affiliation(s)
- A B Gbangboche
- Université de Liège, Faculté de Médecine Vétérinaire, Département des Productions Animales, Liège, Belgium.
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Bruylants G, Wouters J, Michaux C. Differential Scanning Calorimetry in Life Science: Thermodynamics, Stability, Molecular Recognition and Application in Drug Design. Curr Med Chem 2005; 12:2011-20. [PMID: 16101501 DOI: 10.2174/0929867054546564] [Citation(s) in RCA: 247] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
All biological phenomena depend on molecular recognition, which is either intermolecular like in ligand binding to a macromolecule or intramolecular like in protein folding. As a result, understanding the relationship between the structure of proteins and the energetics of their stability and binding with others (bio)molecules is a very interesting point in biochemistry and biotechnology. It is essential to the engineering of stable proteins and to the structure-based design of pharmaceutical ligands. The parameter generally used to characterize the stability of a system (the folded and unfolded state of the protein for example) is the equilibrium constant (K) or the free energy (deltaG(o)), which is the sum of enthalpic (deltaH(o)) and entropic (deltaS(o)) terms. These parameters are temperature dependent through the heat capacity change (deltaCp). The thermodynamic parameters deltaH(o) and deltaCp can be derived from spectroscopic experiments, using the van't Hoff method, or measured directly using calorimetry. Along with isothermal titration calorimetry (ITC), differential scanning calorimetry (DSC) is a powerful method, less described than ITC, for measuring directly the thermodynamic parameters which characterize biomolecules. In this article, we summarize the principal thermodynamics parameters, describe the DSC approach and review some systems to which it has been applied. DSC is much used for the study of the stability and the folding of biomolecules, but it can also be applied in order to understand biomolecular interactions and can thus be an interesting technique in the process of drug design.
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Affiliation(s)
- G Bruylants
- Molecular and Biomolecular Engineering, Université Libre de Bruxelles, Belgium
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Abstract
The design of selective COX-2 inhibitors is a new approach to obtain potent, anti-inflammatory drugs but with less side effects. Several families of such inhibitors were reported in literature. In this review, the drug design processes used to understand their binding mode and the origin of selectivity of these compounds are described.
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Affiliation(s)
- C Michaux
- Laboratory of Molecular and Structural Chemistry, Facultés Universitaires N.-D. de la Paix, 61 rue de Bruxelles, B-5000 Namur, Belgium.
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Diez M, Michaux C, Jeusette I, Baldwin P, Istasse L, Biourge V. Evolution of blood parameters during weight loss in experimental obese Beagle dogs. J Anim Physiol Anim Nutr (Berl) 2004; 88:166-71. [PMID: 15059242 DOI: 10.1111/j.1439-0396.2003.00474.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [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: 12/01/2022]
Abstract
The effects of weight loss on hormonal and biochemical blood parameters were measured monthly [carnitine, creatinine, urea, free T4 (fT4), total T4 (TT4), plasma alkaline phosphatases (ALP), aspartate aminotransferase (AST), alanine aminotransferase (ALT), potassium and total proteins] or bimonthly [cholesterol, triglycerides, non-esterified fatty acids (NEFA), insulin-like growth factor I (IGF-I), glucose, insulin] in eight obese Beagles dogs fed either a high protein dry diet, DP (crude protein 47.5%, on dry matter basis) or a commercial high fibre diet, HF (crude protein 23.8%, crude fibre 23.3%). The dogs were allotted to two groups according to sex and body weight (BW) and they were respectively fed with the DP or the control HF diet during 12-26 weeks, until they reach their optimal BW. The plasma basal triglycerides and cholesterol concentrations were decreased by the two diets but the difference was only significant for the DP diet. The plasma mean NEFA concentration increased regularly over the period with the HF diet, without significant difference between the two diets. No effect of diet or weight loss was observed on plasma carnitine, urea, creatinine, ALP, AST, ALT, potassium, TT4, FT4, IGF-I, glucose and insulin. Weight loss induced a decrease in fT4 plasma concentration (p < 0.001). The high protein diet allowed a safe weight loss.
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Affiliation(s)
- M Diez
- Animal Nutrition Unit, Animal Production Department, Faculty of Veterinary Medicine, University of Liege, Liege, Belgium.
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