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Marchese G, Pittau B, Casu G, Peddio G, Spada G, Pira M, Deriu A, Portesani F, Pisu C, Lazzari P, Pani L. A comparison of continuous subcutaneous paliperidone infusion and repeated subcutaneous injection of risperidone free-base in rats. Eur Psychiatry 2020; 25:92-100. [DOI: 10.1016/j.eurpsy.2009.05.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2008] [Revised: 04/28/2009] [Accepted: 05/28/2009] [Indexed: 11/24/2022] Open
Abstract
AbstractIt is proposed that to achieve a therapeutic effect in schizophrenia patients, dopamine D2-receptor occupancy by antipsychotics within the striatum must exceed 60−65%. However, at high levels of D2-receptor occupancy, the risk of extrapyramidal symptoms (EPS) is increased. Following oral dosing of antipsychotics, peaks and troughs in plasma drug concentrations may be mirrored by fluctuations in D2-receptor occupancy. Paliperidone, a novel antipsychotic available as extended-release tablets (paliperidone ER), is the major active metabolite of risperidone and exhibits a plasma pharmacokinetic profile with reduced peak−trough fluctuations and consistent D2-receptor occupancy compared with conventional oral antipsychotic formulations. Using formulations that resemble those in clinical practice, this study provides a preclinical evaluation of the pharmacological properties of paliperidone ER and risperidone immediate-release formulation in terms of consistent antipsychotic efficacy over time and extrapyramidal symptom liability. Significant fluctuations in inhibition of d-amphetamine-induced hyperlocomotion were observed for repeated subcutaneous (SC) risperidone injections, whereas stable inhibitory efficacy was demonstrated during continuous SC paliperidone infusion. Similarly, significant fluctuations in latency on-bar were observed with repeated SC risperidone injections, whereas significantly lower latency on-bar was demonstrated following continuous SC paliperidone infusion. These results in an animal model suggest that although risperidone and paliperidone demonstrate similar pharmacologic effects, continuous administration of paliperidone achieves more stable antipsychotic efficacy with reduced motor impairment, akin to the effects observed with paliperidone ER in clinical studies.
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Abstract
The activity of lonidamine (a derivative of indazole-carboxylic acid and a new drug with a characteristic antitumor activity) was evaluated In non-small-cell lung cancer (NSCLC). Twenty-five patients with NSCLC with or without prior treatment received lonidamine at the dose of 450 mg/daily p.o. up to progression. Objective responses obtained were: 3 (12%) partial responses and 3 (12%) minor responses with a mean duration of 13.7 weeks for partial responses. Mean duration of treatment was 20 weeks (range 4-97+). During to the drug's characteristics, bone marrow toxicity was not observed; myalgia and mild testicular pain were the most significant side effects.
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Affiliation(s)
- A Contu
- Medical Oncology Dept, Civil Hospital, Sassari, Italy
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Brocca P, Rondelli V, Mallamace F, Di Bari MT, Deriu A, Lohstroh W, Del Favero E, Corti M, Cantu' L. Water response to ganglioside GM1 surface remodelling. Biochim Biophys Acta Gen Subj 2016; 1861:3573-3580. [PMID: 27155581 DOI: 10.1016/j.bbagen.2016.04.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 01/14/2016] [Revised: 04/20/2016] [Accepted: 04/27/2016] [Indexed: 11/17/2022]
Abstract
BACKGROUND Gangliosides are biological glycolipids participating in rafts, structural and functional domains of cell membranes. Their headgroups are able to assume different conformations when packed on the surface of an aggregate, more lying or standing. Switching between different conformations is possible, and is a collective event. Switching can be induced, in model systems, by concentration or temperature increase, then possibly involving ganglioside-water interaction. In the present paper, the effect of GM1 ganglioside headgroup conformation on the water structuring and interactions is addressed. METHODS Depolarized Rayleigh Scattering, Raman Scattering, Quasielastic Neutron Scattering and NMR measurements were performed on GM1 ganglioside solutions, focusing on solvent properties. RESULTS All used techniques agree in evidencing differences in the structure and dynamics of solvent water on different time-and-length scales in the presence of either GM1 headgroup conformations. CONCLUSIONS In general, all results indicate that both the structural properties of solvent water and its interactions with the sugar headgroups of GM1 respond to surface remodelling. The extent of this modification is much higher than expected and, interestingly, ganglioside headgroups seem to turn from cosmotropes to chaotropes upon collective rearrangement from the standing- to the lying-conformation. SIGNIFICANCE In a biological perspective, water structure modulation could be one of the physico-chemical elements contributing to the raft strategy, both for rafts formation and persistence and for their functional aspects. In particular, the interaction with approaching bodies could be favoured or inhibited or triggered by complex-sugar-sequence conformational switch. This article is part of a Special Issue entitled "Science for Life" Guest Editor: Dr. Austen Angell, Dr. Salvatore Magazù and Dr. Federica Migliardo.
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Affiliation(s)
- P Brocca
- Dept. of Medical Biotechnologies and Traslational Medicine, University of Milano, LITA, Via Fratelli Cervi, 93, 20090 Segrate, Italy
| | - V Rondelli
- Dept. of Medical Biotechnologies and Traslational Medicine, University of Milano, LITA, Via Fratelli Cervi, 93, 20090 Segrate, Italy
| | - F Mallamace
- Dept. of Physics and Earth Sciences, University of Messina, Viale F. Stagno D'Alcontres, 31, 98166 Messina, Italy
| | - M T Di Bari
- Dept. of Physics and Earth Sciences, University of Parma, Parco Area delle Scienze, 7/A, 43124 Parma, Italy
| | - A Deriu
- Dept. of Physics and Earth Sciences, University of Parma, Parco Area delle Scienze, 7/A, 43124 Parma, Italy
| | - W Lohstroh
- Heinz Maier-Leibnitz Zentrum, Technische Universität München, Lichtenbergstraße 1, Garching, Germany
| | - E Del Favero
- Dept. of Medical Biotechnologies and Traslational Medicine, University of Milano, LITA, Via Fratelli Cervi, 93, 20090 Segrate, Italy
| | - M Corti
- Dept. of Medical Biotechnologies and Traslational Medicine, University of Milano, LITA, Via Fratelli Cervi, 93, 20090 Segrate, Italy
| | - L Cantu'
- Dept. of Medical Biotechnologies and Traslational Medicine, University of Milano, LITA, Via Fratelli Cervi, 93, 20090 Segrate, Italy
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Padula C, Chiapponi C, Dibari M, Deriu A, Sonvico F, Barbieri S, Ollivier J, Santi P. Single Layer Transdermal Film Containing Lidocaine: Water and Lidocaine Mobility Determined using Neutron Scattering. J Pharm Sci 2010; 99:4277-84. [DOI: 10.1002/jps.22152] [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: 11/08/2022]
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Filabozzi A, Deriu A, Di Bari MT, Russo D, Croci S, Di Venere A. Elastic incoherent neutron scattering as a probe of high pressure induced changes in protein flexibility. Biochim Biophys Acta 2009; 1804:63-7. [PMID: 19735743 DOI: 10.1016/j.bbapap.2009.08.025] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Revised: 08/26/2009] [Accepted: 08/31/2009] [Indexed: 10/20/2022]
Abstract
We report here the results of elastic incoherent neutron scattering experiments on three globular proteins (trypsin, lysozyme and beta-lactoglobulin) in different pressure intervals ranging from 1 bar to 5.5 kbar. A decrease of the mean square hydrogen fluctuations, u(2), has been observed upon increasing pressure. Trypsin and beta-lactoglobulin behave similarly while lysozyme shows much larger changes in u(2). This can be related to different steps in the denaturing processes and to the high propensity of lysozyme to form amyloids. Elastic incoherent neutron scattering has proven to be an effective microscopic technique for the investigation of pressure induced changes in protein flexibility.
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Affiliation(s)
- A Filabozzi
- Università di Roma Tor Vergata, Dipartimento di Fisica and CNISM, Roma, Italy.
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Francesca N, Peters J, Russo D, Barbieri S, Chiapponi C, Cupane A, Deriu A, Di Bari MT, Farhi E, Gerelli Y, Mariani P, Paciaroni A, Rivasseau C, Schirò G, Sonvico F. IN13 Backscattering Spectrometer at ILL: Looking for Motions in Biological Macromolecules and Organisms. ACTA ACUST UNITED AC 2008. [DOI: 10.1080/10448630802474083] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Gerelli Y, Barbieri S, Di Bari MT, Deriu A, Cantù L, Brocca P, Sonvico F, Colombo P, May R, Motta S. Structure of self-organized multilayer nanoparticles for drug delivery. Langmuir 2008; 24:11378-11384. [PMID: 18816016 DOI: 10.1021/la801992t] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The combined use of cryo-TEM, dynamic light scattering, and small-angle X-ray and neutron scattering techniques allows a detailed structural model of complex pharmaceutical preparations of soybean lecithin/chitosan nanoparticles used as drug vectors to be worked out. Charge-driven self-organization of the lipid(-)/polysaccharide(+) vesicles occurs during rapid injection, under mechanical stirring, of an ethanol solution of soybean lecithin into a chitosan aqueous solution. We conclude that beyond the charge inversion region of the phase diagram, i.e., entering the redissolution region, the initial stages of particle formation are likely to be affected by a re-entrant condensation effect at the nanoscale. This behavior resembles that at the mesoscale which is well-known for polyion/amphiphile systems. Close to the boundary of the charge inversion region, nanoparticle formation occurs under a maximum condensation condition at the nanoscale and the complexation-aggregation process is driven toward a maximum multilamellarity. Interestingly, the formulation that maximizes vesicle multilamellarity corresponds to that displaying the highest drug loading efficiency.
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Affiliation(s)
- Y Gerelli
- Dipartimento di Fisica, Università degli Studi di Parma, Italy
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Albanese G, Carbucicchio M, Deriu A. Substitution of Fe3+ by Al3+ in the trigonal sites of M-type hexagonal ferrites. ACTA ACUST UNITED AC 2008. [DOI: 10.1007/bf02894778] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Di Bari M, Gerelli Y, Sonvico F, Deriu A, Cavatorta F, Albanese G, Colombo P, Fernandez-Alonso F. Dynamics of lipid–saccharide nanoparticles by quasielastic neutron scattering. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2007.08.006] [Citation(s) in RCA: 8] [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: 10/23/2022]
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Deriu A, Branca G, Molicotti P, Pintore G, Chessa M, Tirillini B, Paglietti B, Mura A, Sechi LA, Fadda G, Zanetti S. In vitro activity of essential oil of Myrtus communis L. against Helicobacter pylori. Int J Antimicrob Agents 2007; 30:562-3. [PMID: 17851047 DOI: 10.1016/j.ijantimicag.2007.07.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2007] [Revised: 07/13/2007] [Accepted: 07/18/2007] [Indexed: 01/01/2023]
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Albanese G, Deriu A, Ghezzi C. Rayleigh scattering of Mössbauer γ-rays in the amorphous polymer polymethyl methacrylate. ACTA ACUST UNITED AC 2007. [DOI: 10.1007/bf02743440] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ortu S, Felis G, Marzotto M, Deriu A, Molicotti P, Sechi L, Dellaglio F, Zanetti S. Identification and functional characterization of Lactobacillus strains isolated from milk and Gioddu, a traditional Sardinian fermented milk. Int Dairy J 2007. [DOI: 10.1016/j.idairyj.2007.02.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Sonvico F, Cagnani A, Rossi A, Motta S, Di Bari MT, Cavatorta F, Alonso MJ, Deriu A, Colombo P. Formation of self-organized nanoparticles by lecithin/chitosan ionic interaction. Int J Pharm 2006; 324:67-73. [PMID: 16973314 DOI: 10.1016/j.ijpharm.2006.06.036] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2006] [Revised: 06/23/2006] [Accepted: 06/26/2006] [Indexed: 10/24/2022]
Abstract
In this work the production of auto-assembled nanoparticles obtained by the mixing of chitosan and lecithin is presented. The size and surface charge of the nanoparticles were studied as function of the weight ratio between components, the viscosity of the polysaccharide and the pH of the colloidal suspension. In order to elucidate the structure of nanoparticles, micro-FT-IR and elastic neutron scattering experiments have been performed. Results evidenced a strong electrostatic interaction between components and a structure that is neither that of homogeneous spheres nor of coated unilamellar vesicles. Preliminary encapsulation experiments with progesterone, as model lipophilic drug, showed good encapsulation efficiencies.
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Affiliation(s)
- F Sonvico
- Dipartimento Farmaceutico, Università degli Studi di Parma, Viale G.P. Usberti 27/a, 43100 Parma, Italy
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Di Bari M, Deriu A, Albanese G, Cavatorta F. QENS investigation of the dynamics of starch saccharides. Phys Chem Chem Phys 2005; 7:1241-4. [PMID: 19791339 DOI: 10.1039/b502001h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present here quasi-elastic neutron scattering results on D20 hydrated samples of amylose, one of the main saccharide components of starch. Two different sample hydrations (h = 0.5 and 1.0 g D2O (g dry amylose)-1 have been investigated in the temperature range 170 to 350 K. Below 260 K only an elastic contribution is present in the spectra, while a quasi-elastic component shows up above this temperature. The elastic incoherent structure factor (EISF) associated with this component changes considerably with increasing temperature. For the sample with hydration h = 0.5 the confinement volume increases by a factor of four in going from 300 to 350 K, and the proportion of hydrogen involved in the confined diffusion motion increases as well from 30 to 55%. Similar effects are observed at the higher hydration investigated. The observed dynamics can be associated with the known plasticising role of water in polysaccharides.
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Affiliation(s)
- M Di Bari
- Dipartimento di Fisica, Università di Parma, Parma, Italy
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Zanetti S, Sechi LA, Molicotti P, Cannas S, Bua A, Deriu A, Carta A, Paglietti G. In vitro activity of new quinoxalin 1,4-dioxide derivatives against strains of Mycobacterium tuberculosis and other mycobacteria. Int J Antimicrob Agents 2005; 25:179-81. [PMID: 15664491 DOI: 10.1016/j.ijantimicag.2004.11.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Natali F, Relini A, Gliozzi A, Rolandi R, Cavatorta P, Deriu A, Fasano A, Riccio P. Protein–membrane interaction: effect of myelin basic protein on the dynamics of oriented lipids. Chem Phys 2003. [DOI: 10.1016/s0301-0104(03)00255-6] [Citation(s) in RCA: 17] [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: 11/26/2022]
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Spizzo F, Angeli E, Bisero D, Da Re A, Ronconi F, Vavassori P, Bergenti I, Deriu A, Hoell A. Small-angle neutron scattering measurements with polarised neutrons on Fe–Ag magnetic granular systems. J Appl Crystallogr 2003. [DOI: 10.1107/s0021889803000657] [Citation(s) in RCA: 4] [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: 11/10/2022] Open
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Zanetti S, Deriu A, Manzara S, Cattani P, Mura A, Molicotti P, Fadda G, Sechi LA. A molecular method for the recovery and identification of enteric virus in shellfish. New Microbiol 2003; 26:157-62. [PMID: 12737197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
In this paper we report the results of an investigation into the presence of enteric viruses in shellfish from the waters around Sardinia. Twenty two samples of shellfish were examined using a rapid and sensitive technique to concentrate and detect viral RNA in shellfish tissues. After recovery of viral particles, RNA was extracted, transcribed into cDNA and amplified using "nested PCR". Testing with enterovirus-specific RT-PCR produced positive results in over 13% of specimens. The virus detection procedure appears to be effective. In some circumstances it could be a better test of water quality than conventional monitoring techniques.
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Affiliation(s)
- S Zanetti
- Dipartimento di Scienze Biomediche, Sezione di Microbiologia Sperimentale e Clinica, Università degli Studi di Sassari, Italy
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Sechi LA, Deriu A, Falchi MP, Fadda G, Zanetti S. Distribution of virulence genes in Aeromonas spp. isolated from Sardinian waters and from patients with diarrhoea. J Appl Microbiol 2002; 92:221-7. [PMID: 11849349 DOI: 10.1046/j.1365-2672.2002.01522.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.4] [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: 11/20/2022]
Abstract
AIMS To characterize 46 isolates of different Aeromonas spp. strains (26 Aeromonas hydrophila, 13 Aeromonas sobria and 7 Aeromonas salmonicida) isolated from coastal water and clinical sources in Sardinia, Italy. METHODS AND RESULTS The isolates were analysed for the production of the following virulence properties: slime, haemolysin, gelatinase and protease production, and adhesion to eucaryotic epithelial cells. The presence of known virulence genes: A. hydrophila cytolytic enterotoxin gene AHCYTOEN; type IV pilus gene Tap; Bundle forming pilus genes BfpA and BfpG were investigated using polymerase chain reaction (PCR). In addition the enterobacterial repetitive intergenic consensus sequences (ERIC)-PCR fingerprinting was used to further differentiate the strains. CONCLUSIONS This study confirms the presence of virulent Aeromonas strains in the Mediterranean sea. The study also found a greater prevalence of haemolysin, protease and gelatinase production, as well as a higher adhesion capacity, among strains isolated from patients with diarrhoea. SIGNIFICANCE AND IMPACT OF THE STUDY This is the first time that Aeromonads have been isolated and characterized from Sardinian waters and from patients with diarrhoea in Sardinia. This study adds to our knowledge of the ecology of this micro-organism and may in the future help prevent infections both in fish and in humans.
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Affiliation(s)
- L A Sechi
- Dipartimento di Scienze Biomediche, Sezione di Microbiologia Sperimentale e Clinica, Università di Sassari, v.le S. Pietro 43/b, 07100 Sassari, Italy.
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Deriu A, Sechi LA, Molicotti P, Spanu ML, Zanetti S. Virulence genes in halophilic Vibrio spp. isolated in common mussels. New Microbiol 2002; 25:93-6. [PMID: 11837398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Twenty-five Vibrio strains belonging to nine different species, isolated in common mussels, were examined for the presence of different virulence genes: ctxA, tcpA, toxR, toxS, ace, zot and vpi previously found in pathogenic Vibrio cholerae strains. Our results suggest that there is a wide dissemination of Vibrio cholerae virulence genes among the various Vibrio species tested. This finding raises the question of whether a different approach should be taken to study "environmental" Vibrio strains.
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Affiliation(s)
- A Deriu
- Dipartimento di Scienze Biomediche, Sezione di Microbiologia Sperimentale e Clinica, Università degli Studi di Sassari, Italy
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Abstract
We have used the elastic neutron scattering technique to investigate the dynamics of the two main saccharidic components of starch: amylose and amylopectin. The measurements were carried out in the temperature range of 20 to 320 K and at different hydration levels from the dry state up to 0.47 g saccharide/g D(2)O. In the dry samples, the atomic dynamics is harmonic up to approximately 300 K. In the hydrated samples a "glass-like" transition leading to an anharmonic dynamics is observed. The onset of the anharmonicity occurs at temperatures that increase from approximately 180 K to 260 K upon decreasing hydration from 0.5 to 0.1 g saccharide/g D(2)O. This behavior is qualitatively similar to that observed in hydrated globular proteins, but quantitative differences are present. Assuming a simple asymmetric double-well potential model, the temperature and hydration dependence of the transition have been described in terms of few physical parameters.
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Affiliation(s)
- M Di Bari
- Dipartimento di Fisica, Università di Parma and Istituto Nazionale per la Fisica della Materia, Parco Area delle Scienze 7/A, I-43100, Parma, Italy
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Abstract
Bacteria of the genus Vibrio include harmless aquatic strains as well as strains capable of causing epidemics of cholera and human intestinal diseases. Some of these species may show resistance to different antibiotics including cefotaxime, tetracycline and chloramphenicol. The susceptibility to different antibiotics was tested using 40 Vibrio alginolyticus, eight V. parahaemolyticus and six V. vulnificus strains isolated in the coastal waters of Northern Sardinia (Italy). The frequency of resistance to beta-lactams was unexpectedly high. More than 80% of Vibrio isolates were resistant to ampicillin and 2.5% of V. alginolyticus were resistant to ceftazidime and cefotetan. Forty percent of V. alginolyticus and three V. vulnificus isolates gave a positive nitrocefin test. PCR was also performed using selected primers chosen for having common sequences of bla(TEM) and bla(SHV) genes.
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Affiliation(s)
- S Zanetti
- Dipartimento di Scienze Biomediche, Università degli studi di Sassari, Viale S. Pietro 43b, 07100, Sassari, Italy.
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Zanetti S, Deriu A, Volterra L, Falchi MP, Molicotti P, Fadda G, Sechi L. Virulence factors in Vibrio alginolyticus strains isolated from aquatic environments. Ann Ig 2000; 12:487-91. [PMID: 11235505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
In a microbiological monitoring carried out in various aquatic environment of Sardinia Island (Italy) Vibrio alginolyticus with different virulence phenotypes appeared widely spread. Hemolysis, hemoagglutination and protease production might be together particularly in strains isolated from polluted environments. Adherence capacities to two epithelial cells (Hep-2 and Caco-2) available in laboratory were widely spread in the examined bacterial strains. The adhesion degree was influenced by the utilized cellular clone. The lack of a correspondence between adhesion capacity and more traditional virulence tests do not permit its replacement at screening level.
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Affiliation(s)
- S Zanetti
- Dip. di Scienze Biomediche, Sez. Microbiologia Sperimentale e Clinica, Università di Sassari
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Sechi LA, Duprè I, Deriu A, Fadda G, Zanetti S. Distribution of Vibrio cholerae virulence genes among different Vibrio species isolated in Sardinia, Italy. J Appl Microbiol 2000; 88:475-81. [PMID: 10747228 DOI: 10.1046/j.1365-2672.2000.00982.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The members of the genus Vibrio include harmless aquatic strains as well as strains capable of causing epidemics of cholera. Diarrhoea caused by Vibrio cholerae is attributed to cholerae enterotoxin (CT) codified by the ctx operon and regulated by a number of virulence genes such as toxT, toxR and toxS. Fifty-two Vibrio strains were isolated from different aquatic environments in and around Sardinia and searched by PCR for the presence of ctxA, zot, ace, toxR, toxS, toxT, tcpA and vpi virulence genes in the genomes of the isolates. The toxR operon was found in 27 Vibrio alginolyticus strains out of 42 analysed, in three out of four V. cholerae non-O1 strains and in three Vibrio parahaemolyticus isolates. A positive amplification for the virulence pathogenic island (vpi) was produced by five V. alginolyticus strains. Finally, the ace expected amplification fragment was found in two V. alginolyticus isolates whereas the amplification with zot primers produced the expected fragment in one V. alginolyticus isolate. Differentiation of these strains with a PCR fingerprinting technique revealed no association between the presence of virulence genes and a particular fingerprinting pattern. Although most Vibrio species are considered non-pathogenic or only potentially harmful to humans, the finding of V. cholerae virulence genes in other members of the genus Vibrio, and the recent reports of the creation and evolution of pandemic strains of V. cholerae, may give a new perspective to the significance of these results.
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Affiliation(s)
- L A Sechi
- Dipartimento di Scienze Biomediche, Sezione di Microbiologia Sperimentale e Clinica, Università degli studi di Sassari, Sassari, Italy.
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Zanetti S, Deriu A, Duprè I, Sanguinetti M, Fadda G, Sechi LA. Differentiation of Vibrio alginolyticus strains isolated from Sardinian waters by ribotyping and a new rapid PCR fingerprinting method. Appl Environ Microbiol 1999; 65:1871-5. [PMID: 10223972 PMCID: PMC91269 DOI: 10.1128/aem.65.5.1871-1875.1999] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/1998] [Accepted: 02/01/1999] [Indexed: 11/20/2022] Open
Abstract
We investigated the usefulness of a novel PCR fingerprinting technique, based on the specific amplification of genomic regions, to differentiate 30 Vibrio alginolyticus strains isolated in Sardinian waters. The different profiles obtained were scanned and analyzed by a computer program in order to determine genetic relationships. The results were then compared with the patterns obtained by ribotyping with HindIII, KpnI, and XbaI restriction enzymes. PCR fingerprinting could differentiate the strains analyzed into 12 different patterns, whereas ribotyping with XbaI, which produced the highest number of patterns, generated only 7 different profiles. This study revealed the superior discriminative power of the proposed technique for the differentiation of related V. alginolyticus strains and the potential use of PCR fingerprinting in epidemiological studies.
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Affiliation(s)
- S Zanetti
- Dipartimento di Scienze Biomediche, Sezione di Microbiologia Sperimentale e Clinica, Università degli studi di Sassari, 07100 Sassari, Italy
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Deriu A. High-resolution neutron spectroscopy of biological materials. Acta Crystallogr A 1996. [DOI: 10.1107/s0108767396097784] [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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Albanese G, Cavatorta F, Deriu A, Rupprecht A. Reyleigh scattering of Mössbauer radiation in hyaluronate oriented fibres. ACTA ACUST UNITED AC 1996. [DOI: 10.1007/bf02458920] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Andreani C, Filabozzi A, Menzinger F, Desideri A, Deriu A, Di Cola D. Dynamics of hydrogen atoms in superoxide dismutase by quasielastic neutron scattering. Biophys J 1995; 68:2519-23. [PMID: 7647254 PMCID: PMC1282161 DOI: 10.1016/s0006-3495(95)80434-0] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.9] [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] Open
Abstract
The low energy dynamic of the enzyme Cu,Zn superoxide dismutase have been investigated by means of quasielastic neutron scattering in the temperature range 4-320 K. Below 200 K the scattering is purely elastic, while above this temperature a pronounced decrease in the elastic intensity is observed, together with the onset of a small quasielastic component. This behavior is similar to that previously observed in other more flexible globular proteins, and can be attributed to transitions between slightly different conformational substates of the protein tertiary structure. The presence of only a small quasielastic component, whose intensity is < or = 25% of the total spectrum, is related to the high structural rigidity of this protein.
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Affiliation(s)
- C Andreani
- Dipartimento di Fisica, Università di Roma Tor Vergata, Italy
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Middendorf HD, Di Cola D, Cavatorta F, Deriu A, Carlile CJ. Water dynamics in charged and uncharged polysaccharide gels by quasi-elastic neutron scattering. Biophys Chem 1994; 53:145-53. [PMID: 17020843 DOI: 10.1016/0301-4622(94)00085-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/1994] [Revised: 01/20/1995] [Accepted: 03/01/1995] [Indexed: 11/28/2022]
Abstract
Using a microeV neutron spectrometer we have studied the mobility of water in gels formed by two polysaccharides: agarose and hyaluronic acid. Agarose is a nearly uncharged polysaccharide; its gels are fairly stiff, quasi-random networks of fibre bundles. Hyaluronic acid is a highly charged polysaccharide capable of retaining large amounts of water in entangled meshworks with unusual rheological properties. We have analysed sets of quasi-elastic lineshapes broadened by two proton populations with different degrees of freedom. The resulting microscopic mobility parameters and their temperature dependence reveal a complex behaviour. The overall effect of the biopolymer network is to increase translational as well as rotational relaxation times, but the changes observed are not dramatic and cannot fully account for the strikingly different macroscopic properties of these gels. Local electrostatic interactions (over 3 to 20 A) do not appear to influence significantly the rheological behaviour.
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Affiliation(s)
- H D Middendorf
- Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK
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Krupianskiĭ IF, Albaneze D, Gol'danskiĭ VI, Gorbunova IV, Deriu A, Zhuravleva TV, Kavatorta F, Kurinov IV, Suzdalev IP. [Study of the dynamics of human serum albumin by coherent Rayleigh dispersion of Mossbauer radiation]. Mol Biol (Mosk) 1992; 26:1389-96. [PMID: 1491680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The measurements of angle dependencies of total and elastic Rayleigh scattering of Mossbauer radiation intensities have been performed for human serum albumin (HSA) with hydration degrees h = 0.13 and h = 0.4. The extended model was developed for calculating the inelastic intensity of Rayleigh scattering. Original data for HSA and published data on met-Mb were fitted within the frame of this model. The best agreement with experiment was obtained when two types of intraglobular motions were taken into account: individual motions of small side-chain groups and cooperative (mechanical) motions of segments (most probable alpha-helices). Long-range correlated motions are essential at low hydration degree. The possibilities of application of the coherent version of RSMS technique are described.
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Contu A, Marenco G, Pani P, Meloni M, Deriu A, Ortu S, Olmeo N, Schintu GM, Daniotti S. [Preventive role of pirenzepine in gastric damage during cytostatic therapy. A controlled randomized double-blind study with placebo]. Minerva Dietol Gastroenterol 1989; 35:269-72. [PMID: 2695862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Steroids and cytostatic drugs have an undoubtedly damaging action on the gastroduodenal mucosa. The action of pirenzepine was compared with that of the placebo in preventing the gastroduodenal lesions brought on by antiblastic therapy. Sixty patients were separated into two random group under double blind conditions and received 100 mg/die/os of pirenzepine or equivalent placebo for a continuous period of 12 weeks. Antiblastic drugs were administered at the same time. Final endoscopic control and symptomatological findings showed a statistically significant different in favour of the pirenzepine-treated group as early as the 6th week of treatment. No side-effects attributable to pirenzepine were reported.
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Tondi M, Carboni F, Deriu A, Manca S, Mastropaolo C. Intermittent therapy with clobazam for simple febrile convulsions. Dev Med Child Neurol 1987; 29:830-1. [PMID: 3691985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Albanese G, Deriu A, Ugozzoli F, Vignali C. Molecular dynamics of agarose gels investigated by NMR and rayleigh scattering of Mössbauer radiation. ACTA ACUST UNITED AC 1987. [DOI: 10.1007/bf02458064] [Citation(s) in RCA: 5] [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: 10/24/2022]
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Deriu A, Ugozzoli F. Computer program for the evaluation of radial distribution functions in Rayleigh scattering of Mössbauer radiation experiments. J Appl Crystallogr 1985. [DOI: 10.1107/s0021889885009943] [Citation(s) in RCA: 3] [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: 11/10/2022] Open
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