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Asaftei M, Lucidi M, Cirtoaje C, Holban AM, Charitidis CA, Yang F, Wu A, Stanciu GA, Sağlam Ö, Lazar V, Visca P, Stanciu SG. Fighting bacterial pathogens with carbon nanotubes: focused review of recent progress. RSC Adv 2023; 13:19682-19694. [PMID: 37396836 PMCID: PMC10308885 DOI: 10.1039/d3ra01745a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 06/13/2023] [Indexed: 07/04/2023] Open
Abstract
The fast and global spread of bacterial resistance to currently available antibiotics results in a great and urgent need for alternative antibacterial agents and therapeutic strategies. Recent studies on the application of nanomaterials as antimicrobial agents have demonstrated their potential for the management of infectious diseases. Among the diverse palette of nanomaterials currently used in biomedical applications, carbon nanotubes (CNTs) have gained massive interest given their many valuable properties, such as high thermal and electrical conductivity, tensile strength, flexibility convenient aspect ratio, and low fabrication costs. All these features are augmented by facile conjugation with functional groups. CNTs are currently available in many configurations, with two main categories being single-walled and multi-walled CNTs, depending on the number of rolled-up single-layer carbon atoms sheets making up the nanostructure. Both classes have been identified over the past years as promising antibacterial agents but the current level of understanding of their efficiency still harbors many pending questions. This mini-review surveys recent progress on the topic of antibacterial effects of CNTs and examines the proposed mechanisms of action(s) of different CNT typologies, placing the main focus on past studies addressing the antibacterial activity on Staphylococcus aureus and Escherichia coli, two prototypical Gram-positive and Gram-negative pathogens, respectively.
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Affiliation(s)
- Mihaela Asaftei
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest Romania
- Department of Microbiology, University of Bucharest Romania
| | - Massimiliano Lucidi
- Department of Science, Roma Tre University Rome 00146 Italy
- NBFC, National Biodiversity Future Center Palermo 90133 Italy
| | | | | | - Costas A Charitidis
- Research Lab of Advanced, Composite, Nano-Materials and Nanotechnology, School of Chemical Engineering, National Technical University of Athens Greece
| | - Fang Yang
- CIXI Institute for Biomedical Engineering, Ningbo Institute for Materials Technology and Engineering, Chinese Academy of Sciences China
| | - Aiguo Wu
- CIXI Institute for Biomedical Engineering, Ningbo Institute for Materials Technology and Engineering, Chinese Academy of Sciences China
| | - George A Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest Romania
| | - Özge Sağlam
- Department of Mechanical Engineering, İzmir University of Economics Turkey
| | - Veronica Lazar
- Department of Microbiology, University of Bucharest Romania
| | - Paolo Visca
- Department of Science, Roma Tre University Rome 00146 Italy
- Santa Lucia Foundation IRCCS Rome 00179 Italy
| | - Stefan G Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest Romania
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Lazar V, Oprea E, Ditu LM. Resistance, Tolerance, Virulence and Bacterial Pathogen Fitness-Current State and Envisioned Solutions for the Near Future. Pathogens 2023; 12:pathogens12050746. [PMID: 37242416 DOI: 10.3390/pathogens12050746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 05/16/2023] [Accepted: 05/19/2023] [Indexed: 05/28/2023] Open
Abstract
The current antibiotic crisis and the global phenomena of bacterial resistance, inherited and non-inherited, and tolerance-associated with biofilm formation-are prompting dire predictions of a post-antibiotic era in the near future. These predictions refer to increases in morbidity and mortality rates as a consequence of infections with multidrug-resistant or pandrug-resistant microbial strains. In this context, we aimed to highlight the current status of the antibiotic resistance phenomenon and the significance of bacterial virulence properties/fitness for human health and to review the main strategies alternative or complementary to antibiotic therapy, some of them being already clinically applied or in clinical trials, others only foreseen and in the research phase.
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Affiliation(s)
- Veronica Lazar
- Department of Botany and Microbiology, Faculty of Biology, University of Bucharest, 1-3 Portocalelor Street, 060101 Bucharest, Romania
| | - Eliza Oprea
- Department of Botany and Microbiology, Faculty of Biology, University of Bucharest, 1-3 Portocalelor Street, 060101 Bucharest, Romania
| | - Lia-Mara Ditu
- Department of Botany and Microbiology, Faculty of Biology, University of Bucharest, 1-3 Portocalelor Street, 060101 Bucharest, Romania
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Van LT, Hagiu I, Popovici A, Marinescu F, Gheorghe I, Curutiu C, Ditu LM, Holban AM, Sesan TE, Lazar V. Antimicrobial Efficiency of Some Essential Oils in Antibiotic-Resistant Pseudomonas aeruginosa Isolates. Plants 2022; 11:plants11152003. [PMID: 35956481 PMCID: PMC9370326 DOI: 10.3390/plants11152003] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 07/27/2022] [Accepted: 07/27/2022] [Indexed: 11/20/2022]
Abstract
Pseudomonas aeruginosa is a non-fermentative Gram-negative opportunistic pathogen, frequently encountered in difficult-to-treat hospital-acquired infections and also wastewaters. The natural resistance of this pathogen, together with the frequent occurrence of multidrug-resistant strains, make current antibiotic therapy inefficient in treating P. aeruginosa infections. Antibiotic therapy creates a huge pressure to select resistant strains in clinical settings but also in the environment, since high amounts of antibiotics are released in waters and soil. Essential oils (EOs) and plant-derived compounds are efficient, ecologic, and sustainable alternatives in the management of various diseases, including infections. In this study, we evaluated the antibacterial effects of four commercial essential oils, namely, tea tree, thyme, sage, and eucalyptus, on 36 P. aeruginosa strains isolated from hospital infections and wastewaters. Bacterial strains were characterized in terms of virulence and antimicrobial resistance. The results show that most strains expressed soluble pore toxin virulence factors such as lecithinase (89–100%) and lipase (72–86%). All P. aeruginosa strains were positive for alginate encoding gene and 94.44% for protease IV; most of the strains were exotoxin producers (i.e., 80.56% for the ExoS gene, 77.78% for the ExoT gene, while the ExoU gene was present in 38.98% of the strains). Phospholipase-encoding genes (plc) were identified in 91.67/86.11% of the cases (plcH/plcN genes). A high antibiotic resistance level was identified, most of the strains being resistant to cabapenems and cephalosporins. Cabapenem resistance was higher in hospital and hospital wastewater strains (55.56–100%) as compared to those in urban wastewater. The most frequently encountered encoding genes were for extended spectrum β-lactamases (ESBLs), namely, blaCTX-M (83.33% of the strains), blaSHV (80.56%), blaGES (52.78%), and blaVEB (13.89%), followed by carbapenemase-encoding genes (blaVIM, 8.33%). Statistical comparison of the EOs’ antimicrobial results showed that thyme gave the lowest minimum inhibitory concentrations (MIC) and minimum biofilm eradication concentrations (MBEC) in P. aeruginosa-resistant isolates, making this EO a competitive candidate for the development of efficient and ecologic antimicrobial alternatives.
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Affiliation(s)
- Luc Tran Van
- Microbiology & Immunology Department, Faculty of Biology, University of Bucharest, 77206 Bucharest, Romania; (L.T.V.); (A.P.); (F.M.); (I.G.); (L.M.D.); (A.-M.H.); (T.E.S.); (V.L.)
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 050657 Bucharest, Romania
| | - Ilinca Hagiu
- The Overlake Private School, 108th St., Redmond, WA 98053, USA;
| | - Adelina Popovici
- Microbiology & Immunology Department, Faculty of Biology, University of Bucharest, 77206 Bucharest, Romania; (L.T.V.); (A.P.); (F.M.); (I.G.); (L.M.D.); (A.-M.H.); (T.E.S.); (V.L.)
| | - Florica Marinescu
- Microbiology & Immunology Department, Faculty of Biology, University of Bucharest, 77206 Bucharest, Romania; (L.T.V.); (A.P.); (F.M.); (I.G.); (L.M.D.); (A.-M.H.); (T.E.S.); (V.L.)
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 050657 Bucharest, Romania
| | - Irina Gheorghe
- Microbiology & Immunology Department, Faculty of Biology, University of Bucharest, 77206 Bucharest, Romania; (L.T.V.); (A.P.); (F.M.); (I.G.); (L.M.D.); (A.-M.H.); (T.E.S.); (V.L.)
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 050657 Bucharest, Romania
| | - Carmen Curutiu
- Microbiology & Immunology Department, Faculty of Biology, University of Bucharest, 77206 Bucharest, Romania; (L.T.V.); (A.P.); (F.M.); (I.G.); (L.M.D.); (A.-M.H.); (T.E.S.); (V.L.)
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 050657 Bucharest, Romania
- Correspondence:
| | - Lia Mara Ditu
- Microbiology & Immunology Department, Faculty of Biology, University of Bucharest, 77206 Bucharest, Romania; (L.T.V.); (A.P.); (F.M.); (I.G.); (L.M.D.); (A.-M.H.); (T.E.S.); (V.L.)
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 050657 Bucharest, Romania
| | - Alina-Maria Holban
- Microbiology & Immunology Department, Faculty of Biology, University of Bucharest, 77206 Bucharest, Romania; (L.T.V.); (A.P.); (F.M.); (I.G.); (L.M.D.); (A.-M.H.); (T.E.S.); (V.L.)
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 050657 Bucharest, Romania
| | - Tatiana Eugenia Sesan
- Microbiology & Immunology Department, Faculty of Biology, University of Bucharest, 77206 Bucharest, Romania; (L.T.V.); (A.P.); (F.M.); (I.G.); (L.M.D.); (A.-M.H.); (T.E.S.); (V.L.)
| | - Veronica Lazar
- Microbiology & Immunology Department, Faculty of Biology, University of Bucharest, 77206 Bucharest, Romania; (L.T.V.); (A.P.); (F.M.); (I.G.); (L.M.D.); (A.-M.H.); (T.E.S.); (V.L.)
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 050657 Bucharest, Romania
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Lazar V, Holban AM, Curutiu C, Ditu LM. Modulation of Gut Microbiota by Essential Oils and Inorganic Nanoparticles: Impact in Nutrition and Health. Front Nutr 2022; 9:920413. [PMID: 35873448 PMCID: PMC9305160 DOI: 10.3389/fnut.2022.920413] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 06/07/2022] [Indexed: 11/13/2022] Open
Abstract
Microbiota plays a crucial role in human health and disease; therefore, the modulation of this complex and yet widely unexplored ecosystem is a biomedical priority. Numerous antibacterial alternatives have been developed in recent years, imposed by the huge problem of antibioresistance, but also by the people demand for natural therapeutical products without side effects, as dysbiosis, cyto/hepatotoxicity. Current studies are focusing mainly in the development of nanoparticles (NPs) functionalized with herbal and fruit essential oils (EOs) to fight resistant pathogens. This is due to their increased efficiency against susceptible, multidrug resistant and biofilm embedded microorganisms. They are also studied because of their versatile properties, size and possibility to ensure a targeted administration and a controlled release of bioactive substances. Accordingly, an increasing number of studies addressing the effects of functional nanoparticles and plant products on microbial pathogens has been observed. Regardless the beneficial role of EOs and NPs in the treatment of infectious diseases, concerns regarding their potential activity against human microbiota raised constantly in recent years. The main focus of current research is on gut microbiota (GM) due to well documented metabolic and immunological functions of gut microbes. Moreover, GM is constantly exposed to micro- and nano-particles, but also plant products (including EOs). Because of the great diversity of both microbiota and chemical antimicrobial alternatives (i.e., nanomaterials and EOs), here we limit our discussion on the interactions of gut microbiota, inorganic NPs and EOs. Impact of accidental exposure caused by ingestion of day care products, foods, atmospheric particles and drugs containing nanoparticles and/or fruit EOs on gut dysbiosis and associated diseases is also dissected in this paper. Current models developed to investigate mechanisms of dysbiosis after exposure to NPs/EOs and perspectives for identifying factors driving EOs functionalized NPs dysbiosis are reviewed.
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Affiliation(s)
- Veronica Lazar
- Department of Botany and Microbiology, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - Alina-Maria Holban
- Department of Botany and Microbiology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- Laboratory of Microbiology, Research Institute of the University of Bucharest, Bucharest, Romania
- *Correspondence: Alina-Maria Holban
| | - Carmen Curutiu
- Department of Botany and Microbiology, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - Lia Mara Ditu
- Department of Botany and Microbiology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- Laboratory of Microbiology, Research Institute of the University of Bucharest, Bucharest, Romania
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Lazar V, Holban AM, Curutiu C, Chifiriuc MC. Modulation of Quorum Sensing and Biofilms in Less Investigated Gram-Negative ESKAPE Pathogens. Front Microbiol 2021; 12:676510. [PMID: 34394026 PMCID: PMC8359898 DOI: 10.3389/fmicb.2021.676510] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [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: 03/05/2021] [Accepted: 06/30/2021] [Indexed: 01/20/2023] Open
Abstract
Pathogenic bacteria have the ability to sense their versatile environment and adapt by behavioral changes both to the external reservoirs and the infected host, which, in response to microbial colonization, mobilizes equally sophisticated anti-infectious strategies. One of the most important adaptive processes is the ability of pathogenic bacteria to turn from the free, floating, or planktonic state to the adherent one and to develop biofilms on alive and inert substrata; this social lifestyle, based on very complex communication networks, namely, the quorum sensing (QS) and response system, confers them an increased phenotypic or behavioral resistance to different stress factors, including host defense mechanisms and antibiotics. As a consequence, biofilm infections can be difficult to diagnose and treat, requiring complex multidrug therapeutic regimens, which often fail to resolve the infection. One of the most promising avenues for discovering novel and efficient antibiofilm strategies is targeting individual cells and their QS mechanisms. A huge amount of data related to the inhibition of QS and biofilm formation in pathogenic bacteria have been obtained using the well-established gram-positive Staphylococcus aureus and gram-negative Pseudomonas aeruginosa models. The purpose of this paper was to revise the progress on the development of antibiofilm and anti-QS strategies in the less investigated gram-negative ESKAPE pathogens Klebsiella pneumoniae, Acinetobacter baumannii, and Enterobacter sp. and identify promising leads for the therapeutic management of these clinically significant and highly resistant opportunistic pathogens.
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Affiliation(s)
- Veronica Lazar
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- The Research Institute of the University of Bucharest, Bucharest, Romania
| | - Alina Maria Holban
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- The Research Institute of the University of Bucharest, Bucharest, Romania
| | - Carmen Curutiu
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- The Research Institute of the University of Bucharest, Bucharest, Romania
| | - Mariana Carmen Chifiriuc
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- The Research Institute of the University of Bucharest, Bucharest, Romania
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Bechtel S, Lazar V, Albuisson E, Schwan R, Laprévote V, Bernardin F, Schwitzer T. Assessment of neuropsychological impairments in regular cannabis users. Encephale 2021; 48:132-138. [PMID: 34092379 DOI: 10.1016/j.encep.2021.02.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 01/11/2021] [Accepted: 02/01/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND Cannabis is the most widely used illicit drug in the world. It is responsible for cognitive dysfunction of memory, speed of information processing, attention, and executive functions. Cognitive performance depends on the level of study, tolerance, and duration of abstinence from cannabis use. This study analyses cognitive function in a large population of regular cannabis consumers taking into account level of education. METHODS A battery of neuropsychological tests using the Cambridge Neuropsychological Test Automated Battery was performed on a population of 58 cannabis users categorized into two groups according to their level of education with a threshold of 12 years of study, and 25 non-users. RESULTS In Attention Switching Task percent correct trials, significant differences were found between the group of cannabis smokers with less than 12 years of study and the non-smoker group (P=0.022), and between the cannabis users with more than 12 years of study and the non-smoker group (P=0.008). A significantly lower performance in the Rapid Visual Information Processing (Mean latency, Probability of hit, Total hits, Total misses, Correct rejections) was found in the cannabis users with less than 12 years of study compared with the non-user group. CONCLUSION In our population, chronic cannabis users presented divided and sustained attention and working memory disorders. Rapid Visual Information Processing performance may be influenced by education level in cannabis smokers.
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Affiliation(s)
- S Bechtel
- Pôle hospitalo-universitaire de psychiatrie d'adultes du Grand Nancy, centre psychothérapique de Nancy, 1, rue du Docteur Archambault, 54521 Laxou, France
| | - V Lazar
- Pôle hospitalo-universitaire de psychiatrie d'adultes du Grand Nancy, centre psychothérapique de Nancy, 1, rue du Docteur Archambault, 54521 Laxou, France
| | - E Albuisson
- Unité de méthodologie, DRCI, BIOBASE, département MPI, data management et statistique UMDS, CHRU-Nancy, 54000 Nancy, France; Université de Lorraine, Faculté de Médecine, Département du Grand Est de Recherche en Soins Primaires : DEGERESP, 54000 Nancy, France; CNRS, IECL, université de Lorraine, 54000 Nancy, France
| | - R Schwan
- Pôle hospitalo-universitaire de psychiatrie d'adultes du Grand Nancy, centre psychothérapique de Nancy, 1, rue du Docteur Archambault, 54521 Laxou, France; Maison des addictions, CHRU Nancy, Nancy, France; IADI, U1254, INSERM, Université de Lorraine, CHRU de Nancy Brabois, Nancy, France
| | - V Laprévote
- Pôle hospitalo-universitaire de psychiatrie d'adultes du Grand Nancy, centre psychothérapique de Nancy, 1, rue du Docteur Archambault, 54521 Laxou, France; Inserm U1114, fédération de médecine translationnelle de Strasbourg, département de psychiatrie, centre hospitalier régional universitaire de Strasbourg, 67000 Strasbourg, France
| | - F Bernardin
- Pôle hospitalo-universitaire de psychiatrie d'adultes du Grand Nancy, centre psychothérapique de Nancy, 1, rue du Docteur Archambault, 54521 Laxou, France; Inserm U1114, fédération de médecine translationnelle de Strasbourg, département de psychiatrie, centre hospitalier régional universitaire de Strasbourg, 67000 Strasbourg, France
| | - T Schwitzer
- Pôle hospitalo-universitaire de psychiatrie d'adultes du Grand Nancy, centre psychothérapique de Nancy, 1, rue du Docteur Archambault, 54521 Laxou, France; IADI, U1254, INSERM, Université de Lorraine, CHRU de Nancy Brabois, Nancy, France.
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Marinas IC, Oprea E, Buleandra M, Bleotu C, Badea IA, Anastasiu P, Lazar V, Gardus ID, Chifiriuc MC. Chemical, Antimicrobial, Antioxidant and Anti-proliferative Features of the Essential Oil Extracted from the Invasive Plant Solidago canadensis L. Rev Chim 2020. [DOI: 10.37358/rc.20.7.8243] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The essential oil from inflorescences of S. canadensis L. (Goldenrod) obtained by hidrodistillation was analysed by gas chromatography-mass spectrometry and it was qualitatively and quantitatively tested against Gram-positive and Gram-negative bacteria and fungi. The samples were also subjected to screening for their possible antioxidant activity by using DPPH assay and the influence on intracellular ROS (reactive oxygen species). The main components identified were a-pinene, germacrene D, and limonene. The tested microbial strains proved to be susceptible to S. canadensis essential oil which exhibited good anti-biofilm activity, inhibiting the adhesion to the inert and cellular substrate, decreasing the Acinetobacter baumannii adhesion index to 17.52% and changing the adherence pattern. Goldenrod essential oil showed good free-radical scavenging activity, but it increased the production of free radicals in Hep-2 tumor cells.
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Iancu AV, Gurau G, Dumitru C, Baroiu L, Chifiriuc MC, Lazar V, Arbune M, Coman G, Draganescu M. The Role of Cytokine in the Diagnosis and Monitoring of Patients with Systemic Infections. Rev Chim 2020. [DOI: 10.37358/rc.20.7.8263] [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: 11/20/2022]
Abstract
Sepsis is an immunologic disorder with a high rate of mortality which is caused by the exacerbation of the inflammatory response. The purpose of this study was to characterise the etiologic spectrum and the profile of the most significant pro-inflammatory and anti-inflammatory citokines in patients with sistemic infections, by analysing the relationship between the type of etiologic agents and the intensity of the inflammatory response. The study was carried out on a number of 33 patients with systemic infections who were hospitalized in the �Saint Parascheva �Infectious Diseases Clinic Hospital in Galati, Romania. The intensity of the inflammatory response was higher in the sepsis with Gram-negative Bacilli (BGN) as compared to the systemic infections produced by Gram-positive Cocci (CGP). In the case of the patients with bacterial etiology (CGP and BGN) there was evidence of an increase levels of analysed cytokines (TNF-a, IL-1, IL-4, IL-6, IL-10), while the fungal etiology was correlated with high serum concentrations of TNF-a. The levels of IL-4 and IL-6 were similar in all patients with systemic infections, regardless of their etiology. The Klebsiella pneumoniae sepsis has led to the occurrennce of high serum levels both in the case of pro-inflammatory and anti-inflammatory citokines. The obtained results outline the necessity of monitoring pro-inflammatory and anti- inflammatory cytokines in sepsis, which might provide clues about the intensity of the generalized inflammatory reaction, representing not only an important diagnosis criteria but also a useful guide in the therapeutic methods chosen and the monitoring of these severe infections.
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Gheorghe I, Cristea VC, Marutescu L, Popa M, Murariu C, Trusca BS, Borcan E, Ghita MC, Lazar V, Chifiriuc MC. Resistance and Virulence Features in Carbapenem-resistant Acinetobacter baumannii Community Acquired and Nosocomial Isolates in Romania. Rev Chim 2019. [DOI: 10.37358/rc.19.10.7584] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We aimed to identify the virulence and antimicrobial resistance features in Carbapenem Resistant Acinetobacter baumannii (CRAB) strains isolated from hospital settings and compare them with those isolated in the same period of time from community acquired (CA) infections in Bucharest, south of Romania. A total number of 93 A. baumannii strains were isolated in majority from hospitalized patients and from CA infections. The resistance and virulence mechanisms of the strains were characterized by phenotypic and genotypic methods. The antibiotic resistance profiles in H and CA A. baumannii isolates revealed high percentages of carbapenem-resistance in both H and CA isolates. The ciprofloxacin resistance was found very closed in both types of isolates (84%/83.33%). CRAB H and CA isolates revealed the intrinsec carbapenemase OXA-51and the acquired carbapenemases OXA-23, OXA-24, IMP,and VIM-2. The blaOXA-23 gene was identified in different plasmid types (GR2-Aci1, GR6-pACICU2). rep135040, p3S18 and Aci6 in H A. baumannii isolates. The most frequently expressed virulence factor was lipase and DN-ase. OXA-51-like alleles corresponding to the two main sequence groups were identified as blaOXA66 (63.63% of the isolates) and respectively, blaOXA-69 (38.39%) and revealed the corresponding type of ompAand csuE sequence grouping.
AphA6 (24%/16.6%), AphA1 (16%/16.6%) and aadB (9.3%/5.5%) genes were responsible for aminoglycosides resistance. Our survey revealed a high drug resistance in A. baumannii isolates. Different plasmid groups containing CRAB isolates may facilitate the blaOXA23 dissemination.
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Solomon B, Callejo A, Bar J, Berchem G, Bazhenova L, Saintigny P, Raymond E, Girard N, Sulaiman R, Bresson C, Wunder F, Lee J, Raynaud J, Rubin E, Young B, Lazar V, Felip E, Onn A, Leyland-Jones B, Kurzrock R. Survival prolongation by rationale innovative genomics (SPRING): An international WIN consortium phase I study exploring safety and efficacy of avelumab, palbociclib, and axitinib in advanced non-small cell lung cancer (NSCLC) with integrated genomic and transcriptomic correlates. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz260.096] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Lazar V, Ditu LM, Pircalabioru GG, Picu A, Petcu L, Cucu N, Chifiriuc MC. Gut Microbiota, Host Organism, and Diet Trialogue in Diabetes and Obesity. Front Nutr 2019; 6:21. [PMID: 30931309 PMCID: PMC6424913 DOI: 10.3389/fnut.2019.00021] [Citation(s) in RCA: 101] [Impact Index Per Article: 20.2] [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: 12/19/2017] [Accepted: 02/13/2019] [Indexed: 12/12/2022] Open
Abstract
The gastrointestinal tract with its microbiota is a complex, open, and integrated ecosystem with a high environmental exposure. It is widely accepted that the healthy gut microbiotais essential for host homeostasis and immunostasis, harboring an enormous number and variety of microorganisms and genes tailored by hundreds of exogenous and intrinsic host factors. The occurrence of dysbiosis may contribute to host vulnerability and progression to a large spectrum of infectious and non-communicable diseases, including diabetes and obesity, two metabolic disorders that are showing an endemic trend nowadays. There is an urgent need to develop efficient strategies to prevent and treat metabolic disorders such as diabetes and obesity which are often associated with serious complications. In this paper, we give an overview on the implications of gut microbiota in diabesity, with a focus on the triangle gut microbiota—diet-host metabolism and on the way to manipulate the gut microbial ecosystem toward achieving novel diagnosis and predictive biomarkers with the final goal of reestablishing the healthy metabolic condition. The current research data regarding the precision/personalized nutrition suggest that dietary interventions, including administration of pre-, pro-, and syn-biotics, as well as antibiotic treatment should be individually tailored to prevent chronic diseases based on the genetic background, food and beverage consumption, nutrient intake, microbiome, metabolome, and other omic profiles.
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Affiliation(s)
- Veronica Lazar
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania.,Earth, Environmental and Life Sciences Section, Research Institute of the University of Bucharest, University of Bucharest, Bucharest, Romania
| | - Lia-Mara Ditu
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania.,Earth, Environmental and Life Sciences Section, Research Institute of the University of Bucharest, University of Bucharest, Bucharest, Romania
| | - Gratiela G Pircalabioru
- Earth, Environmental and Life Sciences Section, Research Institute of the University of Bucharest, University of Bucharest, Bucharest, Romania
| | - Ariana Picu
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania.,National Institute for Diabetes, Nutrition and Metabolic Diseases Prof. Dr. N. Paulescu, Bucharest, Romania
| | - Laura Petcu
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania.,National Institute for Diabetes, Nutrition and Metabolic Diseases Prof. Dr. N. Paulescu, Bucharest, Romania
| | - Natalia Cucu
- Fundeni Clinical Institute, Bucharest, Romania.,Department of Genetics, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - Mariana Carmen Chifiriuc
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania.,Earth, Environmental and Life Sciences Section, Research Institute of the University of Bucharest, University of Bucharest, Bucharest, Romania
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12
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Abstract
Although consumption of quality drinking water should be available to anyone, without any risk, in reality, for the people living in poor countries, safe water sources are often not an option. In order to eliminate the risk of disease, people prefer to use bottled water, or even bottle beverages, considering them uncontaminated, sterile products. However, the evidence showed that some microbial species belonging to autochthonous water microbiota or even pathogenic species may contaminate and could, in certain conditions, multiply beyond measure in the bottled products. Sometimes, although the bottled water or beverages meet the quality requirements, still, they could be responsible by some water- or food-borne diseases. This chapter presents the main microbial contaminants of these products and the associated risk for waterborne/food-borne diseases.
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Affiliation(s)
- Carmen Curutiu
- Faculty of Biology, University of Bucharest, Bucharest, Romania,Research Institute of the University of Bucharest (ICUB), Bucharest, Romania
| | - Florin Iordache
- Institute of Cellular Biology and Pathology Nicolae Simionescu, Bucharest, Romania,Department of Biochemistry, University of Agronomic Sciences and Veterinary Medicine, Bucharest, Romania
| | - Petruta Gurban
- Stefan S. Nicolau Institute of Virology of Romanian Academy, Bucharest, Romania
| | - Veronica Lazar
- Faculty of Biology, University of Bucharest, Bucharest, Romania,Research Institute of the University of Bucharest (ICUB), Bucharest, Romania
| | - Mariana Carmen Chifiriuc
- Faculty of Biology, University of Bucharest, Bucharest, Romania,Research Institute of the University of Bucharest (ICUB), Bucharest, Romania
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13
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Curutiu C, Iordache F, Lazar V, Pisoschi AM, Pop A, Chifiriuc MC, Hoban AM. Impact of Pseudomonas aeruginosa quorum sensing signaling molecules on adhesion and inflammatory markers in endothelial cells. Beilstein J Org Chem 2018; 14:2580-2588. [PMID: 30410619 PMCID: PMC6204754 DOI: 10.3762/bjoc.14.235] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [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: 08/02/2018] [Accepted: 09/19/2018] [Indexed: 01/20/2023] Open
Abstract
Pseudomonas aeruginosa relies on the quorum sensing (QS) signaling system as a central regulator mechanism of virulence expression that contributes to the formation and maintenance of biofilms and tolerance to conventional antimicrobials. QS Signaling molecules (QSSMs) may be recognized and may function also within the host cells, being potentially involved in the progression of the infectious process. In this study we evaluate the expression of adhesion and inflammatory molecules in endothelial cells treated with P. aeruginosa QSSMs, in order to bring new insights on the mechanisms involved in the interaction of P. aeruginosa with host cells during the infectious process. Endothelial cells were stimulated with 20 µM of main P. aeruginosa QSSMs (OdDHL = N-(3-oxododecanoyl)-L-homoserine lactone, C4HSL = N-butyryl-L-homoserine lactone, PQS = 2-heptyl-3-hydroxy-4(1H)-quinolone and HHQ = 2-heptyl-4-quinolone). Adherence to endothelial cells, inert substratum and biofilm formation was evaluated. The expression of adhesion molecules (VE-cadherin, PECAM-1, ICAM-1, and P-selectin) and inflammatory response molecules (IL-1β, IL-6, TNFα, TGFβ, and eNOS) was assessed by qRT-PCR and flow cytometry. Our results showed that bacterial adherence to inert substratum and biofilm were decreased in the presence of all tested QSSMs. The adherence index of PAO1 laboratory strain to host cells was decreased between 10-40% in the presence of QSSMs, as compared to untreated control. Expression of eukaryotic cells adhesion molecules ICAM-1 and P-selectin was stimulated by QSSMs, whereas VE-cadherin and PECAM-1 levels were increased only by C4HSL. The inflammatory response of endothelial cells was also modulated, as observed by the modified expression of IL-1β (for C4HSL, PQS and HHQ), IL-6 (for C4HSL and HHQ), TNFα (for C4HSL and HHQ), TGFβ, and eNOS factors. Our results demonstrate that the main pseudomonadal QSSMs differentially modulate endothelial cells adhesion and proinflammatory cytokine expression. These observations provide new insights in the mechanisms by which different QSSMs activate endothelial cells and modulate the infectious process, and support the importance of recent studies aiming to develop anti-QS therapeutic strategies to fight against P. aeruginosa infections.
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Affiliation(s)
- Carmen Curutiu
- University of Bucharest, Faculty of Biology, Department of Microbiology-Immunology, Bucharest, Romania.,Research Institute of the University of Bucharest, Romania
| | - Florin Iordache
- University of Agronomical Sciences and Veterinary Medicine, Faculty of Veterinary Medicine, Bucharest, Romania.,Institute of Cellular Biology and Pathology Nicolae Simionescu of Romanian Academy, Romania
| | - Veronica Lazar
- University of Bucharest, Faculty of Biology, Department of Microbiology-Immunology, Bucharest, Romania.,Research Institute of the University of Bucharest, Romania
| | - Aurelia Magdalena Pisoschi
- University of Agronomical Sciences and Veterinary Medicine, Faculty of Veterinary Medicine, Bucharest, Romania
| | - Aneta Pop
- University of Agronomical Sciences and Veterinary Medicine, Faculty of Veterinary Medicine, Bucharest, Romania
| | - Mariana Carmen Chifiriuc
- University of Bucharest, Faculty of Biology, Department of Microbiology-Immunology, Bucharest, Romania.,Research Institute of the University of Bucharest, Romania
| | - Alina Maria Hoban
- University of Bucharest, Faculty of Biology, Department of Microbiology-Immunology, Bucharest, Romania.,Research Institute of the University of Bucharest, Romania
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14
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Spatz A, Lazar V, Rubin E, Lach K, Wang H, Papadakis A, Moscona R, Jimenez P, Kasymjanova G, Cohen V, Agulnik J, Kempen L. MA21.09 Differential Gene Expression in Tumor and Normal Tissue Reveals New Insights in the Biology of Non-Small Cell Lung Carcinoma. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.498] [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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15
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Sima F, Stratakos AC, Ward P, Linton M, Kelly C, Pinkerton L, Stef L, Gundogdu O, Lazar V, Corcionivoschi N. A Novel Natural Antimicrobial Can Reduce the in vitro and in vivo Pathogenicity of T6SS Positive Campylobacter jejuni and Campylobacter coli Chicken Isolates. Front Microbiol 2018; 9:2139. [PMID: 30245680 PMCID: PMC6137164 DOI: 10.3389/fmicb.2018.02139] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [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: 05/09/2018] [Accepted: 08/21/2018] [Indexed: 01/17/2023] Open
Abstract
Human campylobacteriosis is considered one of the most common foodborne diseases worldwide with poultry identified as the main source of infection accounting for 50-80% of human cases. Highly virulent Campylobacter spp., positive for the Type VI secretion system (T6SS), which have an increased ability to adhere to and invade the host gastrointestinal epithelium are highly prevalent in poultry. Multidrug resistant strains of bacteria are rapidly evolving and therefore, new antimicrobials to supplement animal feed that are able to control Campylobacter species, are in great need. The work presented herein indicates that a novel phenolic antimicrobial, Auranta 3001, is able to reduce the adhesion and invasion of human intestinal epithelial cells (HCT-8) by two T6SS positive chicken isolates, C. jejuni RC039 (p < 0.05) and C. coli RC013 (p < 0.001). Exposure of C. jejuni RC039 and C. coli RC013 to Auranta 3001 downregulated the expression of hcp and cetB genes, known to be important in the functionality of T6SS. Furthermore, the reduced adhesion and invasion is associated with a significant decrease in bacterial motility of both isolates (p < 0.05-p < 0.001) in vitro. Most importantly our in vivo results show that Auranta 3001 is able to reduce cecum colonization levels from log 8 CFU/ml to log 2 CFU/ml for C. jejuni RC039 and from log 7 CFU/ml to log 2 CFU/ml for C. coli RC013. In conclusion, this novel antimicrobial is able to reduce the pathogenic properties of T6SS campylobacters in vitro and also to decrease colonization in vivo.
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Affiliation(s)
- Filip Sima
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast, United Kingdom
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- Auranta, NovaUCD, Dublin, Ireland
| | - Alexandros Ch. Stratakos
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast, United Kingdom
- Auranta, NovaUCD, Dublin, Ireland
| | | | - Mark Linton
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast, United Kingdom
| | - Carmel Kelly
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast, United Kingdom
| | - Laurette Pinkerton
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast, United Kingdom
| | - Lavinia Stef
- School of Animal Science and Biotechnology, Banat University of Animal Sciences and Veterinary Medicine – King Michael I of Romania, Timisoara, Romania
| | - Ozan Gundogdu
- London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Veronica Lazar
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - Nicolae Corcionivoschi
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast, United Kingdom
- School of Animal Science and Biotechnology, Banat University of Animal Sciences and Veterinary Medicine – King Michael I of Romania, Timisoara, Romania
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16
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Sima F, Stratakos AC, Ward P, Linton M, Kelly C, Pinkerton L, Stef L, Gundogdu O, Lazar V, Corcionivoschi N. A Novel Natural Antimicrobial Can Reduce the in vitro and in vivo Pathogenicity of T6SS Positive Campylobacter jejuni and Campylobacter coli Chicken Isolates. Front Microbiol 2018; 9:2139. [PMID: 30245680 DOI: 10.3389/fmicb.2018.02139/full] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 08/21/2018] [Indexed: 05/27/2023] Open
Abstract
Human campylobacteriosis is considered one of the most common foodborne diseases worldwide with poultry identified as the main source of infection accounting for 50-80% of human cases. Highly virulent Campylobacter spp., positive for the Type VI secretion system (T6SS), which have an increased ability to adhere to and invade the host gastrointestinal epithelium are highly prevalent in poultry. Multidrug resistant strains of bacteria are rapidly evolving and therefore, new antimicrobials to supplement animal feed that are able to control Campylobacter species, are in great need. The work presented herein indicates that a novel phenolic antimicrobial, Auranta 3001, is able to reduce the adhesion and invasion of human intestinal epithelial cells (HCT-8) by two T6SS positive chicken isolates, C. jejuni RC039 (p < 0.05) and C. coli RC013 (p < 0.001). Exposure of C. jejuni RC039 and C. coli RC013 to Auranta 3001 downregulated the expression of hcp and cetB genes, known to be important in the functionality of T6SS. Furthermore, the reduced adhesion and invasion is associated with a significant decrease in bacterial motility of both isolates (p < 0.05-p < 0.001) in vitro. Most importantly our in vivo results show that Auranta 3001 is able to reduce cecum colonization levels from log 8 CFU/ml to log 2 CFU/ml for C. jejuni RC039 and from log 7 CFU/ml to log 2 CFU/ml for C. coli RC013. In conclusion, this novel antimicrobial is able to reduce the pathogenic properties of T6SS campylobacters in vitro and also to decrease colonization in vivo.
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Affiliation(s)
- Filip Sima
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast, United Kingdom
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- Auranta, NovaUCD, Dublin, Ireland
| | - Alexandros Ch Stratakos
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast, United Kingdom
- Auranta, NovaUCD, Dublin, Ireland
| | | | - Mark Linton
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast, United Kingdom
| | - Carmel Kelly
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast, United Kingdom
| | - Laurette Pinkerton
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast, United Kingdom
| | - Lavinia Stef
- School of Animal Science and Biotechnology, Banat University of Animal Sciences and Veterinary Medicine - King Michael I of Romania, Timisoara, Romania
| | - Ozan Gundogdu
- London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Veronica Lazar
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - Nicolae Corcionivoschi
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast, United Kingdom
- School of Animal Science and Biotechnology, Banat University of Animal Sciences and Veterinary Medicine - King Michael I of Romania, Timisoara, Romania
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17
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Lazar V, Ditu LM, Pircalabioru GG, Gheorghe I, Curutiu C, Holban AM, Picu A, Petcu L, Chifiriuc MC. Aspects of Gut Microbiota and Immune System Interactions in Infectious Diseases, Immunopathology, and Cancer. Front Immunol 2018; 9:1830. [PMID: 30158926 PMCID: PMC6104162 DOI: 10.3389/fimmu.2018.01830] [Citation(s) in RCA: 295] [Impact Index Per Article: 49.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 07/24/2018] [Indexed: 12/12/2022] Open
Abstract
The microbiota consists of a dynamic multispecies community of bacteria, fungi, archaea, and protozoans, bringing to the host organism a dowry of cells and genes more numerous than its own. Among the different non-sterile cavities, the human gut harbors the most complex microbiota, with a strong impact on host homeostasis and immunostasis, being thus essential for maintaining the health condition. In this review, we outline the roles of gut microbiota in immunity, starting with the background information supporting the further presentation of the implications of gut microbiota dysbiosis in host susceptibility to infections, hypersensitivity reactions, autoimmunity, chronic inflammation, and cancer. The role of diet and antibiotics in the occurrence of dysbiosis and its pathological consequences, as well as the potential of probiotics to restore eubiosis is also discussed.
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Affiliation(s)
- Veronica Lazar
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- Earth, Environmental and Life Sciences Section, Research Institute of the University of Bucharest, Bucharest, Romania
| | - Lia-Mara Ditu
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- Earth, Environmental and Life Sciences Section, Research Institute of the University of Bucharest, Bucharest, Romania
| | - Gratiela Gradisteanu Pircalabioru
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- Earth, Environmental and Life Sciences Section, Research Institute of the University of Bucharest, Bucharest, Romania
| | - Irina Gheorghe
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- Earth, Environmental and Life Sciences Section, Research Institute of the University of Bucharest, Bucharest, Romania
| | - Carmen Curutiu
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- Earth, Environmental and Life Sciences Section, Research Institute of the University of Bucharest, Bucharest, Romania
| | - Alina Maria Holban
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- Earth, Environmental and Life Sciences Section, Research Institute of the University of Bucharest, Bucharest, Romania
| | - Ariana Picu
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- National Institute for Diabetes, Nutrition and Metabolic Diseases Prof. Dr. N. Paulescu, Bucharest, Romania
| | - Laura Petcu
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- National Institute for Diabetes, Nutrition and Metabolic Diseases Prof. Dr. N. Paulescu, Bucharest, Romania
| | - Mariana Carmen Chifiriuc
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Bucharest, Romania
- Earth, Environmental and Life Sciences Section, Research Institute of the University of Bucharest, Bucharest, Romania
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18
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Zalaru C, Dumitrascu F, Draghici C, Tarcomnicu I, Tatia R, Moldovan L, Chifiriuc MC, Lazar V, Marinescu M, Nitulescu MG, Ferbinteanu M. Synthesis, spectroscopic characterization, DFT study and antimicrobial activity of novel alkylaminopyrazole derivatives. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.11.073] [Citation(s) in RCA: 5] [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: 10/18/2022]
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19
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Mitache MM, Curutiu C, Gheorghe I, Lazar V, Bucur M, Bleotu C, Cochior D, Rusu E, Chifiriuc CM. Phenotypic, Biochemical and Genotypic Charcaterisation of Some Factors Involved in the Virulence and Survival of Bacteria Isolated from Food and Food Processing Surfaces. Rev Chim 2018. [DOI: 10.37358/rc.18.1.6055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Species of the Enterobacteriaceae family are frequently involved in various gastrointestinal infectious diseases, including food poisoning that without proper treatment and medical supervision can be fatal for some patients, particularly for those with weak immune systems. Therefore we proposed to characterize the virulence factors of some strains from the Enterobacteriaceae family isolated from food and food processing surfaces at the phenotypic and genotypic level in order to assess the microbiological risk for the public health. The strains were identified using conventional biochemical methods. The expression of virulence soluble markers and the ability of the enterobacterial strains to adhere to the inert and cellular substrate were investigated. At the genetic level the presence of some genes involved in adhesion and virulence was also investigated by PCR. The tested strains revealed a different adherence capacity to the inert and cellular substrata and also ability to develop biofilms. Regarding enzymatic factors, esculin hydrolysis with the production of esculetin as an iron chelating agent and the casein hydrolysing protease were mostly expressed. The results proved that Enterobacteriaceae strains isolated from food could represent a microbiological risk factor for consumers� health, contributing also to the setting up of the reservoir virulence and resistance genes.
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20
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Sadik O, Ditu LM, Gheorghe I, Gradisteanu Pircalabioru G, Bleotu C, Banu O, Merezeanu N, Lupu AC, Lazar V, Chifiriuc MC. Adherence and Biofilm Formation in Candida albicans Strains Isolated from Different Infection Sites in Hospitalized Patients. Rev Chim 2018. [DOI: 10.37358/rc.17.12.5988] [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: 11/20/2022]
Abstract
Adherence of Candida albicans to the cellular and inert substratum contributes to its commensal status, but also plays an essential role in the development of fungal infections, particularly in hospitalized and immunodepressed patients. This study evaluated the adherence capacity and biofilm formation of 109 C. albicans strains isolated from upper respiratory tract secretions, wound secretions, urine culture, blood culture and stool culture taken from patients hospitalized for cardiovascular surgery. The strains were originally identified as C. albicans, based on their morphological characteristics and then confirmed by the Vitek II automatic system. All tested strains adhered to the cellular substratum, the isolates from stool culture, urine and thrush secretion exhibiting the most intensive adhesion capacity, the predominant adherence pattern being the aggregative one. Patient age and gender did not exhibit a significant influence on the adhesion process. The strains with the highest biofilm production capacity were the ones isolated from respiratory tract secretions and urine cultures. Statistically significant correlations could be established among a high number of yeast cells adhered to HeLa cells and i) the aggregative adherence pattern and ii) the moderate to high capacity to form biofilms on the inert substratum. These results could suggest the implication of common fungal structures in the colonization of inert and cellular substrata, while the elucidation of the molecular mechanisms involved in these processes could bring an important benefit to the appropriate management of fungal infections, depending on the isolation source.
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21
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Trușcă BS, Gheorghe I, Marutescu L, Curutiu C, Marinescu F, Ghiță CM, Borcan E, Țuică L, Minciuna V, Gherghin HE, Chifiriuc MC, Lazar V. Beta-lactam and quinolone resistance markers in uropathogenic strains isolated from renal transplant recipients. REV ROMANA MED LAB 2017. [DOI: 10.1515/rrlm-2017-0033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Abstract
Our objectives were to investigate the extended-spectrum beta-lactamases (ESBLs) and carbapenemases (CR) genetic determinants and to assess the association between ESBL production and quinolone resistance in bacterial strains isolated from renal transplant recipients with urinary tract infections. Material and methods: A number of 30 isolates were recovered from urine specimens of patients with renal transplant from October 2015 to March 2016. The isolates were analyzed for ESBL production using double disc synergy test and for CR production by the Hodge test. Phenotypically confirmed isolates were screened by PCR for the identification of ESBL, CR and fluoroquinolone resistance genes. Results: The 30 clinical bacterial strains isolated from urinary tract infections in renal transplant recipients were identified as Klebsiella pneumoniae (17), Pseudomonas aeruginosa (7), Morganella morganii (2), Escherichia coli (2), Edwardsiella tarda (1) and Enterobacter cloacae (1). Out of them, 22 isolates were ESBL producers and 20 multi-drug resistant (MDR) (i.e., 13 K. pneumoniae and 7 P. aeruginosa strains). More than half of the ESBL clinical strains (14/22, 63.63%) revealed at least one ESBL gene, the most frequent being blaCTX-M type (18/22, 81.81%), either alone (4/22, 18.18%) or in combination with another ESBL gene (17/22, 77.27%), followed by blaTEM (13/22, 59.09%). The blaOXA-48 was present in 10 isolates (33.33%). The most frequent association of ESBLs and CR genes (5/14, 35.71%) was revealed by blaCTX-M- blaTEM - blaOXA-48, encountered particularly among K. pneumoniae isolates (4/17, 23.52%). The qnrB gene was identified in five strains, i.e. one P. aeruginosa ESBL isolate (expressing the blaCTX-M gene) and four K. pneumoniae ESBL isolates (harboring the blaCTX-M - blaTEM genes combination). Conclusions: The uropathogenic strains isolated from renal transplant recipients exhibited high rates of MDR and beta-lactam resistance. The selective pressure exerted by quinolones could enable uropathogenic bacteria to acquire resistance to this class of antibiotics.
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Affiliation(s)
- Bianca-Simona Trușcă
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest , Romania
| | - Irina Gheorghe
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest , Romania
| | - Luminita Marutescu
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest , Romania
- Research Institute of the University of Bucharest -ICUB, Romania
| | - Carmen Curutiu
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest , Romania
- Research Institute of the University of Bucharest -ICUB, Romania
| | - Florica Marinescu
- National Institute for Research and Development in Environmental Protection, Bucuresti , Romania
| | | | | | | | | | | | - Mariana Carmen Chifiriuc
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest , Romania
- Research Institute of the University of Bucharest -ICUB, Romania
| | - Veronica Lazar
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest , Romania
- Research Institute of the University of Bucharest -ICUB, Romania
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22
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Nica IC, Stan MS, Popa M, Chifiriuc MC, Pircalabioru GG, Lazar V, Dumitrescu I, Diamandescu L, Feder M, Baibarac M, Cernea M, Maraloiu VA, Popescu T, Dinischiotu A. Development and Biocompatibility Evaluation of Photocatalytic TiO₂/Reduced Graphene Oxide-Based Nanoparticles Designed for Self-Cleaning Purposes. Nanomaterials (Basel) 2017; 7:E279. [PMID: 28925946 PMCID: PMC5618390 DOI: 10.3390/nano7090279] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 09/11/2017] [Accepted: 09/14/2017] [Indexed: 11/16/2022]
Abstract
Graphene is widely used in nanotechnologies to amplify the photocatalytic activity of TiO₂, but the development of TiO₂/graphene composites imposes the assessment of their risk to human and environmental health. Therefore, reduced graphene oxide was decorated with two types of TiO₂ particles co-doped with 1% iron and nitrogen, one of them being obtained by a simultaneous precipitation of Ti3+ and Fe3+ ions to achieve their uniform distribution, and the other one after a sequential precipitation of these two cations for a higher concentration of iron on the surface. Physico-chemical characterization, photocatalytic efficiency evaluation, antimicrobial analysis and biocompatibility assessment were performed for these TiO₂-based composites. The best photocatalytic efficiency was found for the sample with iron atoms localized at the sample surface. A very good anti-inhibitory activity was obtained for both samples against biofilms of Gram-positive and Gram-negative strains. Exposure of human skin and lung fibroblasts to photocatalysts did not significantly affect cell viability, but analysis of oxidative stress showed increased levels of carbonyl groups and advanced oxidation protein products for both cell lines after 48 h of incubation. Our findings are of major importance by providing useful knowledge for future photocatalytic self-cleaning and biomedical applications of graphene-based materials.
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Affiliation(s)
- Ionela Cristina Nica
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Miruna S Stan
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Marcela Popa
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 060101 Bucharest, Romania.
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Mariana Carmen Chifiriuc
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 060101 Bucharest, Romania.
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Gratiela G Pircalabioru
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 060101 Bucharest, Romania.
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Veronica Lazar
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 060101 Bucharest, Romania.
| | - Iuliana Dumitrescu
- National R&D Institute for Textiles and Leather Bucharest (INCDTP), 16 Lucretiu Patrascanu, 030508 Bucharest, Romania.
| | - Lucian Diamandescu
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Marcel Feder
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Mihaela Baibarac
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Marin Cernea
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Valentin Adrian Maraloiu
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Traian Popescu
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Anca Dinischiotu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
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Mihailescu IN, Bociaga D, Popescu-Pelin G, Stan GE, Duta L, Socol G, Chifiriuc MC, Bleotu C, Lazar V, Husanu MA, Zgura I, Miculescu F, Negut I, Hapenciuc C. Optimized silicon reinforcement of carbon coatings by pulsed laser technique for superior functional biomedical surfaces fabrication. Biofabrication 2017; 9:025029. [PMID: 28462910 DOI: 10.1088/1758-5090/aa7076] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We report on the fabrication of silicon-reinforced carbon (C:Si) structures by combinatorial pulsed laser deposition to search for the best design for a new generation of multi-functional coated implants. The synthesized films were characterized from the morphological, structural, compositional, mechanical and microbiological points of view. Scanning electron microscopy revealed the presence, on top of the deposited layers, of spheroid particulates with sizes in the micron range. No micro-cracks or delaminations were observed. Energy dispersive x-ray spectroscopy and grazing incidence x-ray diffraction pointed to the existence of a C to Si compositional gradient from one end of the film to the other. Raman investigation revealed a relatively high sp3 hybridization of up to 80% at 40-48 mm apart from the edge with higher C content. Si addition was demonstrated to significantly increase C:Si film bonding to the substrate, with values above the ISO threshold for coatings to be used in high-loading biomedical applications. Surface energy studies pointed to an increase in the hydrophilic character of the deposited structures along with Si content up to 52 mN m-1. In certain cases, the Si-reinforced C coatings elicited an antimicrobial biofilm action. The presence of Si was proven to be benign to HEp-2 cells of human origin, without interfering with their cellular cycle. On this basis, reliable C:Si structures with good adherence to the substrate and high efficiency against microbial biofilms can be developed for implant coatings and other advanced medical devices.
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Affiliation(s)
- I N Mihailescu
- National Institute for Lasers, Plasma and Radiation Physics, 077125 Magurele, Romania
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Holban AM, Bleotu C, Chifiriuc MC, Lazar V. Phenotypic and Genetic Evaluation of the Influence of Pseudomonas aeruginosa Culture Fractions on the Human Mesenchymal Stem Cells Viability, Apoptotic Pathways and Cytokine Profile. Curr Stem Cell Res Ther 2017; 12:175-180. [PMID: 26496886 DOI: 10.2174/1574888x10666151026114817] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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: 05/25/2015] [Revised: 08/03/2015] [Accepted: 09/18/2015] [Indexed: 11/22/2022]
Abstract
The objective of this study was to investigate the effects of P. aeruginosa PAO1 cellular and soluble culture fractions on human mesenchymal stem cells (MSCs) death signaling pathways and cytokine profile. The bone marrow isolated MSCs, incubated for different periods of time with one of the three P. aeruginosa PAO1 culture fractions, i.e. low density whole cultures, heat inactivated bacterial cultures sediments and sterile supernatants, were submitted to the following assays: i) fluorescence microscopy evaluation of cellular morphology and viability; ii) bax, caspase 9, relA and bcl-2 genes expression analysis by qRT-PCR; and iii) quantification of the level of IL-1β, IL-6, IL-8 and IL-10 cytokines released in the MSCs supernatants determined by ELISA. Results were statistically analyzed using the GraphPad In Stat software. The PAO1 whole cultures exhibited the most relevant influences, impacting on MSCs morphology and viability, interfering with apoptotic pathways and significantly stimulating the production of IL-1β and IL-10, while decreasing the production of IL-6 and IL-8. The culture supernatants increased the production of IL-1β and reduced the secretion of all other tested cytokines, while heat-inactivated bacterial cells significantly stimulated both IL-1β and IL-10 production. These data could suggest that in vivo, the fate of P. aeruginosa infection depends on the proportion between different bacterial culture fractions (i.e. the number of viable bacterial cells, the number of dead cells and the amount of bacterial soluble products accumulated locally) that could be influenced by the initial infective dose, by the host defense mechanisms, and also by the administered antimicrobial treatment that may thus interfere with the evolution and magnitude of the induced lesions.
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Affiliation(s)
- Alina Maria Holban
- Department of Microbiology and Immunology, Faculty of Biology, University of Bucharest, Intrarea Portocalelor 1-3, 060101, Sector 6, Bucharest, Romania
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25
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Abd-Elsalam KA, Alghuthaymi MA, Andreeva DV, Armentano I, Bejenaru C, Bejenaru LE, Benfeito S, Boelter JF, Borges F, Brandelli A, Caplan DM, Caplan ME, Chifiriuc MC, Curutiu C, Czobor I, Deng X, Ditu LM, Duran N, El-Baz AF, El-Tras WF, Fernandes C, Florea DA, Fonseca A, Fortunati E, Garrido EM, Garrido J, Garrigós MC, Gheorghe I, Ghoora MD, Grumezescu AM, Hashim AF, Holban AM, Iordache F, Jaczynski J, Juárez N, Kailasa SK, Kenny JM, Kobayashi RK, Kollath A, Konur O, Lazar V, Leys C, Lopes NA, Luksiene Z, Mateescu L, Mehta VN, Meireles A, Mogoşanu GD, Nakazato G, Nikiforov AY, Oliveira C, Oporto GS, Padmanabh PR, Pathak J, Puglia D, Ramos M, Richa, Rodríguez-Hernández J, Said-Galiev E, Sakudo A, Seabra AB, Simões M, Singh V, Sinha RP, Sonker AS, Sorour NM, Srividya N, Tayel AA, Valdés A, Wu HF, Zhong T. List of Contributors. Food Preservation 2017:xv-xxi. [DOI: 10.1016/b978-0-12-804303-5.00024-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Georgescu M, Chifiriuc M, Marutescu L, Gheorghe I, Lazar V, Bolocan A, Bertesteanu S. Bioactive Wound Dressings for the Management of Chronic Wounds. CURR ORG CHEM 2016. [DOI: 10.2174/1385272820666160510171040] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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27
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Delcaru C, Alexandru I, Podgoreanu P, Grosu M, Stavropoulos E, Chifiriuc MC, Lazar V. Microbial Biofilms in Urinary Tract Infections and Prostatitis: Etiology, Pathogenicity, and Combating strategies. Pathogens 2016; 5:pathogens5040065. [PMID: 27916925 PMCID: PMC5198165 DOI: 10.3390/pathogens5040065] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [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: 08/26/2016] [Accepted: 11/28/2016] [Indexed: 02/07/2023] Open
Abstract
Urinary tract infections (UTIs) are one of the most important causes of morbidity and health care spending affecting persons of all ages. Bacterial biofilms play an important role in UTIs, responsible for persistent infections leading to recurrences and relapses. UTIs associated with microbial biofilms developed on catheters account for a high percentage of all nosocomial infections and are the most common source of Gram-negative bacteremia in hospitalized patients. The purpose of this mini-review is to present the role of microbial biofilms in the etiology of female UTI and different male prostatitis syndromes, their consequences, as well as the challenges for therapy.
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Affiliation(s)
- Cristina Delcaru
- Earth, Environmental and Life Sciences Section-ICUB, Research Institute of the University of Bucharest, University of Bucharest, Bucharest 060101, Romania.
| | - Ionela Alexandru
- Iancului Private Laboratory, Bucharest 060101, Romania.
- Department of Microbiology & Immunology, Faculty of Biology, University of Bucharest, Bucharest 060101, Romania.
| | - Paulina Podgoreanu
- Iancului Private Laboratory, Bucharest 060101, Romania.
- Department of Microbiology & Immunology, Faculty of Biology, University of Bucharest, Bucharest 060101, Romania.
| | - Mirela Grosu
- Department of Microbiology & Immunology, Faculty of Biology, University of Bucharest, Bucharest 060101, Romania.
| | - Elisabeth Stavropoulos
- Earth, Environmental and Life Sciences Section-ICUB, Research Institute of the University of Bucharest, University of Bucharest, Bucharest 060101, Romania.
| | - Mariana Carmen Chifiriuc
- Earth, Environmental and Life Sciences Section-ICUB, Research Institute of the University of Bucharest, University of Bucharest, Bucharest 060101, Romania.
- Department of Microbiology & Immunology, Faculty of Biology, University of Bucharest, Bucharest 060101, Romania.
| | - Veronica Lazar
- Earth, Environmental and Life Sciences Section-ICUB, Research Institute of the University of Bucharest, University of Bucharest, Bucharest 060101, Romania.
- Department of Microbiology & Immunology, Faculty of Biology, University of Bucharest, Bucharest 060101, Romania.
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Nica IC, Stan MS, Dinischiotu A, Popa M, Chifiriuc MC, Lazar V, Pircalabioru GG, Bezirtzoglou E, Iordache OG, Varzaru E, Dumitrescu I, Feder M, Vasiliu F, Mercioniu I, Diamandescu L. Innovative Self-Cleaning and Biocompatible Polyester Textiles Nano-Decorated with Fe-N-Doped Titanium Dioxide. Nanomaterials (Basel) 2016; 6:nano6110214. [PMID: 28335342 PMCID: PMC5245744 DOI: 10.3390/nano6110214] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 11/03/2016] [Accepted: 11/07/2016] [Indexed: 11/21/2022]
Abstract
The development of innovative technologies to modify natural textiles holds an important impact for medical applications, including the prevention of contamination with microorganisms, particularly in the hospital environment. In our study, Fe and N co-doped TiO2 nanoparticles have been obtained via the hydrothermal route, at moderate temperature, followed by short thermal annealing at 400 °C. These particles were used to impregnate polyester (PES) materials which have been evaluated for their morphology, photocatalytic performance, antimicrobial activity against bacterial reference strains, and in vitro biocompatibility on human skin fibroblasts. Microscopic examination and quantitative assays have been used to evaluate the cellular morphology and viability, cell membrane integrity, and inflammatory response. All treated PES materials specifically inhibited the growth of Gram-negative bacilli strains after 15 min of contact, being particularly active against Pseudomonas aeruginosa. PES fabrics treated with photocatalysts did not affect cell membrane integrity nor induce inflammatory processes, proving good biocompatibility. These results demonstrate that the treatment of PES materials with TiO2-1% Fe–N particles could provide novel biocompatible fabrics with short term protection against microbial colonization, demonstrating their potential for the development of innovative textiles that could be used in biomedical applications for preventing patients’ accidental contamination with microorganisms from the hospital environment.
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Affiliation(s)
- Ionela Cristina Nica
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Miruna Silvia Stan
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Anca Dinischiotu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Marcela Popa
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 60101 Bucharest, Romania.
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Mariana Carmen Chifiriuc
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 60101 Bucharest, Romania.
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Veronica Lazar
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 60101 Bucharest, Romania.
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Gratiela G Pircalabioru
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Eugenia Bezirtzoglou
- Department of Agricultural Development, Democritus University of Thrace, 67100 Xanthi, Greece.
| | - Ovidiu G Iordache
- National R & D Institute for Textiles and Leather Bucharest (INCDTP), 16 Lucretiu Patrascanu, 030508 Bucharest, Romania.
| | - Elena Varzaru
- National R & D Institute for Textiles and Leather Bucharest (INCDTP), 16 Lucretiu Patrascanu, 030508 Bucharest, Romania.
| | - Iuliana Dumitrescu
- National R & D Institute for Textiles and Leather Bucharest (INCDTP), 16 Lucretiu Patrascanu, 030508 Bucharest, Romania.
| | - Marcel Feder
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Florin Vasiliu
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Ionel Mercioniu
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Lucian Diamandescu
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
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Ciubuca BM, Saviuc CM, Chifiriuc MC, Lazar V. Microbial Resistance to Natural Compounds: Challenges for Developing Novel Alternatives to Antibiotics. CURR ORG CHEM 2016. [DOI: 10.2174/1385272820666160510165625] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Ditu LM, Lazar V, Grumezescu A, Holban A. Biopolymers Tailored For Intelligent Scaffolding and Drug Delivery. CURR ORG CHEM 2016. [DOI: 10.2174/1385272820666160511103622] [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: 11/22/2022]
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31
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Lazar V, Saviuc CM, Chifiriuc MC. Periodontitis and Periodontal Disease - Innovative Strategies for Reversing the Chronic Infectious and Inflammatory Condition by Natural Products. Curr Pharm Des 2016; 22:230-7. [PMID: 26561076 DOI: 10.2174/138161282202151221124307] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2015] [Accepted: 11/11/2015] [Indexed: 11/22/2022]
Abstract
Oral microbiota of the mouth is the most diverse microbial community in the human body and plays a decisive role in the emergence and evolution of gingival pathology, contributing as well to the host general health condition, based on complex interactions established between the microbial community members and the host. A specific shift in the quantity and diversity of the microbial community developed on dental and mucosal surfaces, could lead to the occurrence of chronic inflammation mediated by the overproduction of pro-inflammatory cytokines. The mechanical treatment and current medication efficiency for the periodontal disease is limited in time due to the rapid plaque forming. Also, the antimicrobial treatment is limited by the sessile growth of the microorganisms, resulting in a poor biofilm penetration by biocides or antibiotics. In line with that, the attention of the scientific community shifted to ethnopharmacology as a complementary, or alternative therapeutic option for fighting infections with resistant bacteria. The vegetal and bee products are an important source of bioactive compounds, acting as harmless antimicrobials and periodontal inflammation suppressors. Vegetable bioproducts have been proven to exhibit multiple antipathogenic effects, such as microbicidal activity, virulence attenuation, and synergistic effects between the components found in the complex vegetal matrixes, or with conventional biocides, as well as immunomodulatory effects. The purpose of this review is to highlight the importance of vegetable products as a possible complementary treatment for periodontitis and their potential for the development of innovative therapeutic strategies.
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Affiliation(s)
| | - Crina-Maria Saviuc
- University of Bucharest, Faculty of Biology, Department of Botany-Microbiology, Research Institute of the University of Bucharest-ICUB, Splaiul Independentei 91-95 Sector 5, cod 76201, Bucuresti, Romania.
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Stan MS, Nica IC, Dinischiotu A, Varzaru E, Iordache OG, Dumitrescu I, Popa M, Chifiriuc MC, Pircalabioru GG, Lazar V, Bezirtzoglou E, Feder M, Diamandescu L. Photocatalytic, Antimicrobial and Biocompatibility Features of Cotton Knit Coated with Fe-N-Doped Titanium Dioxide Nanoparticles. Materials (Basel) 2016; 9:ma9090789. [PMID: 28773913 PMCID: PMC5457061 DOI: 10.3390/ma9090789] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 08/29/2016] [Accepted: 09/01/2016] [Indexed: 11/16/2022]
Abstract
Our research was focused on the evaluation of the photocatalytic and antimicrobial properties, as well as biocompatibility of cotton fabrics coated with fresh and reused dispersions of nanoscaled TiO₂-1% Fe-N particles prepared by the hydrothermal method and post-annealed at 400 °C. The powders were characterized by X-ray diffraction (XRD), Mössbauer spectroscopy and X-ray photoelectron spectroscopy. The textiles coated with doped TiO₂ were characterized by scanning electron microscopy and energy dispersive X-ray analyses, and their photocatalytic effect by trichromatic coordinates of the materials stained with methylene blue and coffee and exposed to UV, visible and solar light. The resulting doped TiO₂ consists of a mixture of prevailing anatase phase and a small amount (~15%-20%) of brookite, containing Fe3+ and nitrogen. By reusing dispersions of TiO₂-1% Fe-N, high amounts of photocatalysts were deposited on the fabrics, and the photocatalytic activity was improved, especially under visible light. The treated fabrics exhibited specific antimicrobial features, which were dependent on their composition, microbial strain and incubation time. The in vitro biocompatibility evaluation on CCD-1070Sk dermal fibroblasts confirmed the absence of cytotoxicity after short-term exposure. These results highlight the potential of TiO₂-1% Fe-N nanoparticles for further use in the development of innovative self-cleaning and antimicrobial photocatalytic cotton textiles. However, further studies are required in order to assess the long-term skin exposure effects and the possible particle release due to wearing.
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Affiliation(s)
- Miruna Silvia Stan
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Ionela Cristina Nica
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Anca Dinischiotu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Elena Varzaru
- National R&D Institute for Textiles and Leather Bucharest (INCDTP), 16 Lucretiu Patrascanu, 030508 Bucharest, Romania.
| | - Ovidiu George Iordache
- National R&D Institute for Textiles and Leather Bucharest (INCDTP), 16 Lucretiu Patrascanu, 030508 Bucharest, Romania.
| | - Iuliana Dumitrescu
- National R&D Institute for Textiles and Leather Bucharest (INCDTP), 16 Lucretiu Patrascanu, 030508 Bucharest, Romania.
| | - Marcela Popa
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 60101 Bucharest, Romania.
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Mariana Carmen Chifiriuc
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 60101 Bucharest, Romania.
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Gratiela G Pircalabioru
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 60101 Bucharest, Romania.
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Veronica Lazar
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 60101 Bucharest, Romania.
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Eugenia Bezirtzoglou
- Department of Agricultural Development, Democritus University of Thrace, 67100 Xanthi, Greece.
| | - Marcel Feder
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Lucian Diamandescu
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
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Holban AM, Chifiriuc MC, Lazar V. Recognition and Impact of Host-derived Molecules on Bacterial Cell-to-cell Signalling Pathways. Med Chem 2016; 11:610-7. [PMID: 25741882 DOI: 10.2174/1573406411666150305113146] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Revised: 02/27/2015] [Accepted: 02/28/2015] [Indexed: 11/22/2022]
Abstract
Microbe-host signalling is now a well accepted concept and an intensively studied research field. Although some of the observed bacterial phenotypes are attributed to host-recognition and inter-kingdom signalling, most of them are not relying on a proved molecular mechanism. Recent progress revealed some recognition and signalling pathways for host molecules in bacterial cells, which try to explain their modulatory effect on growth and virulence. Since the current knowledge on the field is poor and debatable, the purpose of this paper is to review and discuss the research performed in order to elucidate the ways by which microbial cells recognize and decode the host molecule signals.
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Affiliation(s)
| | | | - Veronica Lazar
- University of Bucharest, Faculty of Biology, Department of Botanic-Microbiology, Ale. Portocalelor 1-3, 60101, Bucharest, Romania.
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Rădulescu M, Holban AM, Mogoantă L, Bălşeanu TA, Mogoșanu GD, Savu D, Popescu RC, Fufă O, Grumezescu AM, Bezirtzoglou E, Lazar V, Chifiriuc MC. Fabrication, Characterization, and Evaluation of Bionanocomposites Based on Natural Polymers and Antibiotics for Wound Healing Applications. Molecules 2016; 21:E761. [PMID: 27294905 PMCID: PMC6273619 DOI: 10.3390/molecules21060761] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 06/03/2016] [Accepted: 06/06/2016] [Indexed: 12/31/2022] Open
Abstract
The aim of our research activity was to obtain a biocompatible nanostructured composite based on naturally derived biopolymers (chitin and sodium alginate) loaded with commercial antibiotics (either Cefuroxime or Cefepime) with dual functions, namely promoting wound healing and assuring the local delivery of the loaded antibiotic. Compositional, structural, and morphological evaluations were performed by using the thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and fourier transform infrared spectroscopy (FTIR) analytical techniques. In order to quantitatively and qualitatively evaluate the biocompatibility of the obtained composites, we performed the tetrazolium-salt (MTT) and agar diffusion in vitro assays on the L929 cell line. The evaluation of antimicrobial potential was evaluated by the viable cell count assay on strains belonging to two clinically relevant bacterial species (i.e., Escherichia coli and Staphylococcus aureus).
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Affiliation(s)
- Marius Rădulescu
- Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania.
| | - Alina Maria Holban
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania.
- Microbiology Immunology Department, Faculty of Biology, University of Bucharest, 1-3 Portocalelor Lane, Sector 5, 77206 Bucharest, Romania.
- Research Institute of the University of Bucharest, Life, Environmental and Earth Sciences, Spl. Independentei 91-95, 0500088 Bucharest, Romania.
| | - Laurențiu Mogoantă
- Research Center for Microscopic Morphology and Immunology, University of Medicine and Pharmacy of Craiova, PetruRares Street, No. 2, 200349 Craiova, Romania.
| | - Tudor-Adrian Bălşeanu
- Research Center for Clinical and Experimental Medicine, University of Medicine and Pharmacy of Craiova 2 PetruRareş Street, 200349 Craiova, Romania.
| | - George Dan Mogoșanu
- Department of Pharmacognosy & Phytotherapy, Faculty of Pharmacy, University of Medicine and Pharmacy of Craiova, PetruRares Street, No. 2, 200349 Craiova, Romania.
| | - Diana Savu
- Department of Life and Environmental Physics, "HoriaHulubei" National Institute of Physics and Nuclear Engineering, Magurele, 077125 Bucharest, Romania.
| | - Roxana Cristina Popescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania.
- Department of Life and Environmental Physics, "HoriaHulubei" National Institute of Physics and Nuclear Engineering, Magurele, 077125 Bucharest, Romania.
| | - Oana Fufă
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania.
- Lasers Department, National Institute for Laser, Plasma and Radiation Physics, Magurele, 077125 Bucharest, Romania.
| | - Alexandru Mihai Grumezescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania.
| | - Eugenia Bezirtzoglou
- Laboratory of Microbiology, Biotechnology and Hygiene, Department of Food Science and Technology, Faculty of Agricultural Development, Democritus University of Thrace, 68200 Orestiada, Greece.
| | - Veronica Lazar
- Microbiology Immunology Department, Faculty of Biology, University of Bucharest, 1-3 Portocalelor Lane, Sector 5, 77206 Bucharest, Romania.
| | - Mariana Carmen Chifiriuc
- Microbiology Immunology Department, Faculty of Biology, University of Bucharest, 1-3 Portocalelor Lane, Sector 5, 77206 Bucharest, Romania.
- Research Institute of the University of Bucharest, Life, Environmental and Earth Sciences, Spl. Independentei 91-95, 0500088 Bucharest, Romania.
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Georgescu M, Gheorghe I, Curutiu C, Lazar V, Bleotu C, Chifiriuc MC. Virulence and resistance features of Pseudomonas aeruginosa strains isolated from chronic leg ulcers. BMC Infect Dis 2016; 16 Suppl 1:92. [PMID: 27169367 PMCID: PMC4890939 DOI: 10.1186/s12879-016-1396-3] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [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: 01/27/2016] [Accepted: 01/27/2016] [Indexed: 11/29/2022] Open
Abstract
Background The purpose of this study was to evaluate the virulence profiles of Pseudomonas aeruginosa clinical strains recently isolated from patients hospitalized for chronic leg ulcers in the Dermatology Department of Central Military Emergency University Hospital “Carol Davila”, Bucharest, Romania. Methods The phenotypic screening evaluated eight soluble virulence factors (haemolysins, lecithinase, lipase, caseinase, gelatinase, amylase, DNase, aesculin hydrolysis), as well as adherence ability (Cravioto adapted method) and invasion capacity on HeLa cells (gentamicin protection assay). Seven virulence genes encoding for protease IV, 3 exoenzymes (exoS, exoT, exoU), two phospholipases plcH- haemolytic phospholipase C and plcN- non-haemolytic phospholipase C) and alginate were investigated by PCR. Results The pore forming toxins and enzymes were expressed in variable proportions, the majority of the tested strains producing beta haemolysin (92.3 %), lipase (76.9 %) and lecithinase (61.5 %). The most frequent virulence genes detected in the analyzed strains were the ExoT (100 %) and AlgD (92.3 %) genes, genes codifying for phospholipases (84.6 % each of them) and for protease IV (61.5 %). Conclusions This study reveals that correlating virulence profiles and infection clinical outcome is very useful for setting up efficient preventive and therapeutic procedures for hospitalized patients with chronic leg ulcers and positive P. aeruginosa cultures.
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Affiliation(s)
- Mihaela Georgescu
- Dermatology Department, Central University Emergency Military Hospital Dr Carol Davila, Bucharest, Romania.,Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - Irina Gheorghe
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania.,Research Institute of the University of Bucharest -ICUB, Bucharest, Romania
| | - Carmen Curutiu
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania.,Research Institute of the University of Bucharest -ICUB, Bucharest, Romania
| | - Veronica Lazar
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania.,Research Institute of the University of Bucharest -ICUB, Bucharest, Romania
| | - Coralia Bleotu
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania. .,Ștefan S Nicolau Institute of Virology, Romanian Academy, 030304, Bucharest, Romania.
| | - Mariana-Carmen Chifiriuc
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania.,Research Institute of the University of Bucharest -ICUB, Bucharest, Romania
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Popa M, Hussien MD, Cirstea A, Grigore R, Lazar V, Bezirtzoglou E, Chifiriuc MC, Sakizlian M, Stavropoulou E, Bertesteanu S. Insights on Metal Based Dental Implants and their Interaction with the Surrounding Tissues. Curr Top Med Chem 2016; 15:1614-21. [PMID: 25877088 DOI: 10.2174/1568026615666150414144033] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Revised: 02/17/2015] [Accepted: 02/28/2015] [Indexed: 11/22/2022]
Abstract
At present, the use of dental implants is a very common practice as tooth loss is a frequent problem and can occur as a result of disease or trauma. An implant is usually made of biocompatible materials that do not cause rejection reactions and allow the implant union with the respective bone. To achieve this goal, the implant surface may have different structures and coatings, generally used to increase the adherence of the implant to the bone and to decrease the risk of the periimplantar inflammatory reactions. This review gives some insights of the metal based materials used for dental implants, their limits, improvement strategies as well as the pathophysiology, diagnosis, treatment and prevention of periimplantary diseases.
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Affiliation(s)
| | | | | | | | | | - Eugenia Bezirtzoglou
- Democritus University of Thrace Faculty of Agricultural Development, Department of Food Science and Technology Laboratory of Microbiology, Biotechnology and Hygiene, 68200-Orestiada, Greece.
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Mihai MM, Holban AM, Giurcaneanu C, Popa LG, Oanea RM, Lazar V, Chifiriuc MC, Popa M, Popa MI. Microbial biofilms: impact on the pathogenesis of periodontitis, cystic fibrosis, chronic wounds and medical device-related infections. Curr Top Med Chem 2016; 15:1552-76. [PMID: 25877092 DOI: 10.2174/1568026615666150414123800] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 12/12/2014] [Accepted: 01/12/2015] [Indexed: 11/22/2022]
Abstract
The majority of chronic infections are associated with mono- or polymicrobial biofilms, having a significant impact on the patients' quality of life and survival rates. Although the use of medical devices revolutionized health care services and significantly improved patient outcomes, it also led to complications associated with biofilms and to the emergence of multidrug resistant bacteria. Immunocompromised patients, institutionalized or hospitalized individuals, elderly people are at greater risk due to life-threatening septic complications, but immunocompetent individuals with predisposing genetic or acquired diseases can also be affected, almost any body part being able to shelter persistent biofilms. Moreover, chronic biofilm-related infections can lead to the occurrence of systemic diseases, as in the case of chronic periodontitis, linked to atherosclerosis, cardiovascular disease and diabetes. The more researchers discover, new unknown issues add up to the complexity of biofilm infections, in which microbial species establish relationships of cooperation and competition, and elaborate phenotypic differentiation into functional, adapted communities. Their interaction with the host's immune system or with therapeutic agents contributes to the complex puzzle that still misses a lot of pieces. In this comprehensive review we aimed to highlight the microbial composition, developmental stages, architecture and properties of medical biofilms, as well as the diagnostic tools used in the management of biofilm related infections. Also, we present recently acquired knowledge on the etiopathogenesis, diagnosis and treatment of four chronic diseases associated with biofilm development in tissues (chronic periodontitis, chronic lung infection in cystic fibrosis, chronic wounds) and artificial substrata (medical devices-related infections).
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Affiliation(s)
| | | | | | | | | | | | - Mariana Carmen Chifiriuc
- Department of Microbiology, Faculty of Biology, University of Bucharest, 1-3 Portocalelor Lane, 060101 Bucharest, Romania.
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Pop CS, Hussien MD, Popa M, Mares A, Grumezescu AM, Grigore R, Lazar V, Chifiriuc MC, Sakizlian M, Bezirtzoglou E, Bertesteanu S. Metallic-based micro and nanostructures with antimicrobial activity. Curr Top Med Chem 2016; 15:1577-82. [PMID: 25877091 DOI: 10.2174/1568026615666150414125015] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 01/30/2015] [Accepted: 02/14/2015] [Indexed: 11/22/2022]
Abstract
The spectacular progress of research in the nanotechnology field led to the achievement of important knowledge of materials at the atomic and molecular scale and the extent of the use of nanoparticles in the design of medical products, ecological processes, cosmetics and other biotechnological applications. One of the current focuses of the medical applications of nanotechnology is the development of new strategies to inhibit the activity of different microorganisms. The purpose of this review was to present the antimicrobial activity of metal cations in micro- and nanoparticulate forms and the dependence of this biological activity on shape, size and physico-chemical conditions.
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Affiliation(s)
| | | | | | | | | | | | | | - Mariana Carmen Chifiriuc
- University of Bucharest, Faculty of Biology, Department of Botanics and Microbiology, Ale.Portocalelor 1-3, 60101 Bucharest, Romania.
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Marinas IC, Oprea E, Chifiriuc MC, Badea IA, Buleandra M, Lazar V. Chemical Composition and Antipathogenic Activity ofArtemisia annuaEssential Oil from Romania. Chem Biodivers 2015; 12:1554-64. [DOI: 10.1002/cbdv.201400340] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Indexed: 01/28/2023]
Affiliation(s)
- Ioana C. Marinas
- University of Bucharest, Faculty of Biology, Microbiology Department, 1 – 3 Portocalilor Way, RO‐060101 Bucharest; Research Institute of the University of Bucharest‐ICUB, 91 – 95 Spl. Independentei, RO‐Bucharest
| | - Eliza Oprea
- University of Bucharest, Faculty of Chemistry, Department of Organic Chemistry, Biochemistry and Catalysis, 4 – 12 Regina Elisabeta, RO‐030018 Bucharest, (phone: +4021‐305‐1462; fax: +4021‐412‐0140)
| | - Mariana Carmen Chifiriuc
- University of Bucharest, Faculty of Biology, Microbiology Department, 1 – 3 Portocalilor Way, RO‐060101 Bucharest; Research Institute of the University of Bucharest‐ICUB, 91 – 95 Spl. Independentei, RO‐Bucharest
| | - Irinel Adriana Badea
- University of Bucharest, Faculty of Chemistry, Department of Analytical Chemistry, 4 – 12 Regina Elisabeta, RO‐030018 Bucharest
| | - Mihaela Buleandra
- University of Bucharest, Faculty of Chemistry, Department of Analytical Chemistry, 4 – 12 Regina Elisabeta, RO‐030018 Bucharest
| | - Veronica Lazar
- University of Bucharest, Faculty of Biology, Microbiology Department, 1 – 3 Portocalilor Way, RO‐060101 Bucharest; Research Institute of the University of Bucharest‐ICUB, 91 – 95 Spl. Independentei, RO‐Bucharest
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Bleotu C, Chifiriuc MC, Pircalabioru G, Berteşteanu ŞVG, Grigore R, Ruta SM, Lazar V. Significance of serum antibodies against HSP 60 and HSP 70 for the diagnostic of infectious diseases. Virulence 2015; 5:828-31. [PMID: 25483863 DOI: 10.4161/21505594.2014.973800] [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] [Indexed: 12/20/2022] Open
Abstract
Heat shock proteins (HSP) represent important antigenic targets for the immune response, playing an important role in the pathology and infectious diseases control. The purpose of this work was to investigate the levels of HSP60 and HSP70 specific antibodies in the bloodstream of patients with different bacterial infections and cancer, in order to evaluate their potential role as diagnosis markers of different infectious diseases. Detection of specific anti-HSP 60 and HSP 70 serum levels was performed by ELISA. Statistical analysis of data by multivariate logistic regression was performed using GraphPadPrism software and statistical tests based on chi-square and Student t-test. High levels of anti-HSP60 were found in patients with localized infections, while the levels of anti- HSP70 were higher in the group with generalized infections. The serum levels of both anti-HSP 60 and anti-HSP70 were significantly increased in patients with Gram-negative bacterial infections, as compared with patients harbouring infections produced by Gram-positive and fungal strains, demonstrating their potential use as additional diagnosis and prognosis markers in infections with this etiology.
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Affiliation(s)
- Coralia Bleotu
- a Faculty of Biology ; Research Institute of the University of Bucharest; University of Bucharest ; Bucharest , Romania
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Bertesteanu S, Chifiriuc MC, Grumezescu AM, Printza AG, Marie-Paule T, Grumezescu V, Mihaela V, Lazar V, Grigore R. Biomedical applications of synthetic, biodegradable polymers for the development of anti-infective strategies. Curr Med Chem 2015; 21:3383-90. [PMID: 24606501 DOI: 10.2174/0929867321666140304104328] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2013] [Revised: 12/15/2013] [Accepted: 12/19/2013] [Indexed: 11/22/2022]
Abstract
The emergence of antibiotic resistance in microbial strains is representing one of the major threats to public health worldwide, due to the decreased or total cancelling of the available antibiotics effectiveness, correlated with the slow development of novel antibiotics. Due to their excellent biodegradability and biocompatibility, the synthetic polymers could find a lot of biomedical applications, such as the development of biomaterials with optimized properties and of drug delivery systems. This review is focusing on the applications of synthetic, biodegradable polymers for the improvement of antiinfective therapeutic and prophylactic agents (i.e., antimicrobial and anti-inflammatory agents and vaccines) activity, as well as for the design of biomaterials with increased biocompatibility and resistance to microbial colonization.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Raluca Grigore
- University of Bucharest, Faculty of Biology, Microbiology Department, Ale. Portocalelor 1-3, 60101, Bucharest, Romania.
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Rodon J, Soria JC, Berger R, Batist G, Tsimberidou A, Bresson C, Lee JJ, Rubin E, Onn A, Schilsky RL, Miller WH, Eggermont AM, Mendelsohn J, Lazar V, Kurzrock R. Challenges in initiating and conducting personalized cancer therapy trials: perspectives from WINTHER, a Worldwide Innovative Network (WIN) Consortium trial. Ann Oncol 2015; 26:1791-8. [PMID: 25908602 DOI: 10.1093/annonc/mdv191] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [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: 01/06/2015] [Accepted: 04/13/2015] [Indexed: 12/11/2022] Open
Abstract
Advances in 'omics' technology and targeted therapeutic molecules are together driving the incorporation of molecular-based diagnostics into the care of patients with cancer. There is an urgent need to assess the efficacy of therapy determined by molecular matching of patients with particular targeted therapies. WINTHER is a clinical trial that uses cutting edge genomic and transcriptomic assays to guide treatment decisions. Through the lens of this ambitious multinational trial (five countries, six sites) coordinated by the Worldwide Innovative Networking Consortium for personalized cancer therapy, we discovered key challenges in initiation and conduct of a prospective, omically driven study. To date, the time from study concept to activation has varied between 19 months at Gustave Roussy Cancer Campus in France to 30 months at the Segal Cancer Center, McGill University (Canada). It took 3+ years to be able to activate US sites due to national regulatory hurdles. Access to medications proposed by the molecular analysis remains a major challenge, since their availability through active clinical trials is highly variable over time within sites and across the network. Rules regarding the off-label use of drugs, or drugs not yet approved at all in some countries, pose a further challenge, and many biopharmaceutical companies lack a simple internal mechanism to supply the drugs even if they wish to do so. These various obstacles should be addressed to test and then implement precision medicine in cancer.
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Affiliation(s)
- J Rodon
- Vall D'Hebron Institute of Oncology and Universitat Autonoma de Barcelona, Barcelona, Spain
| | - J C Soria
- Gustave Roussy Cancer Campus Grand Paris, Villejuif, France
| | - R Berger
- Oncology Institute, Chaim Sheba Medical Center, Tel-Hashomer, Israel
| | - G Batist
- Segal Cancer Center, Jewish General Hospital Mcgill University, Montreal Quebec Consortium de Recherche en Oncologie Clinique, Quebec, Canada
| | - A Tsimberidou
- The University of Texas MD Anderson Cancer Center, Houston, USA
| | | | - J J Lee
- The University of Texas MD Anderson Cancer Center, Houston, USA
| | - E Rubin
- The National Institute of Biotechnology in the Negev, Ben Gurion University, Beer-Sheva, Israel
| | - A Onn
- Oncology Institute, Chaim Sheba Medical Center, Tel-Hashomer, Israel
| | - R L Schilsky
- American Society of Clinical Oncology (ASCO), Alexandria
| | - W H Miller
- Segal Cancer Center, Jewish General Hospital Mcgill University, Montreal Quebec Consortium de Recherche en Oncologie Clinique, Quebec, Canada
| | - A M Eggermont
- Gustave Roussy Cancer Campus Grand Paris, Villejuif, France
| | - J Mendelsohn
- The University of Texas MD Anderson Cancer Center, Houston, USA
| | - V Lazar
- Gustave Roussy Cancer Campus Grand Paris, Villejuif, France
| | - R Kurzrock
- Center for Personalized Cancer Therapy, UC San Diego-Moores Cancer Center, La Jolla, USA
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Gheorghe I, Novais Â, Grosso F, Rodrigues C, Chifiriuc MC, Lazar V, Peixe L. Snapshot on carbapenemase-producing Pseudomonas aeruginosa and Acinetobacter baumannii in Bucharest hospitals reveals unusual clones and novel genetic surroundings for blaOXA-23. J Antimicrob Chemother 2015; 70:1016-20. [PMID: 25630639 DOI: 10.1093/jac/dku527] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES The present study was designed to provide a snapshot on carbapenemase-producing Pseudomonas aeruginosa (n=11) and Acinetobacter baumannii (n=7) isolates in hospitalized patients (November 2011, January-March 2012) from two main hospitals in Bucharest, south Romania. METHODS Clonality among isolates was established by PFGE, MLST and Fourier transform infrared spectroscopy. Carbapenemases were screened by the Blue-Carba test, PCR and sequencing. Transferability of blaOXA-23 was tested by conjugation and plasmid typing (number, size and identity) was assessed by S1-PFGE, replicon typing, hybridization and PCR mapping. RESULTS All P. aeruginosa isolates carried chromosomally located blaVIM-2, associated with a common class 1 integron (aacA7-blaVIM-2) or an atypical configuration (aacA7-blaVIM-2-dfrB5-tniC). These isolates belonged to unusual lineages; mostly ST233 disseminated in one hospital unit, with ST364 and ST1074 also being detected. A. baumannii isolates carried blaOXA-23 in Tn2008, which was found truncating a TnaphA6 transposon located in a common 60 kb GR6 (aci6) pABKp1-like conjugative plasmid in highly related CC92 clones (ST437, ST764 and ST765), where CC stands for clonal complex. CONCLUSIONS Our results show the spread of VIM-2-producing P. aeruginosa and OXA-23-producing A. baumannii clinical isolates in two hospitals from Bucharest and highlight a peculiar population structure in this Eastern European country. Also, we demonstrate the dissemination of a common and conjugative aci6 pABKp1-like plasmid scaffold in different A. baumannii clones and we report the first known identification of Tnaph6-carrying pACICU2-like plasmids in Europe.
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Affiliation(s)
- Irina Gheorghe
- Department of Microbiology, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - Ângela Novais
- UCIBIO/REQUIMTE, Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Filipa Grosso
- UCIBIO/REQUIMTE, Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Carla Rodrigues
- UCIBIO/REQUIMTE, Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | | | - Veronica Lazar
- Department of Microbiology, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - Luísa Peixe
- UCIBIO/REQUIMTE, Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
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Bilcu M, Grumezescu AM, Oprea AE, Popescu RC, Mogoșanu GD, Hristu R, Stanciu GA, Mihailescu DF, Lazar V, Bezirtzoglou E, Chifiriuc MC. Efficiency of vanilla, patchouli and ylang ylang essential oils stabilized by iron oxide@C14 nanostructures against bacterial adherence and biofilms formed by Staphylococcus aureus and Klebsiella pneumoniae clinical strains. Molecules 2014; 19:17943-56. [PMID: 25375335 PMCID: PMC6271200 DOI: 10.3390/molecules191117943] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 10/22/2014] [Accepted: 10/29/2014] [Indexed: 12/11/2022] Open
Abstract
Biofilms formed by bacterial cells are associated with drastically enhanced resistance against most antimicrobial agents, contributing to the persistence and chronicization of the microbial infections and to therapy failure. The purpose of this study was to combine the unique properties of magnetic nanoparticles with the antimicrobial activity of three essential oils to obtain novel nanobiosystems that could be used as coatings for catheter pieces with an improved resistance to Staphylococcus aureus and Klebsiella pneumoniae clinical strains adherence and biofilm development. The essential oils of ylang ylang, patchouli and vanilla were stabilized by the interaction with iron oxide@C14 nanoparticles to be further used as coating agents for medical surfaces. Iron oxide@C14 was prepared by co-precipitation of Fe+2 and Fe+3 and myristic acid (C14) in basic medium. Vanilla essential oil loaded nanoparticles pelliculised on the catheter samples surface strongly inhibited both the initial adherence of S. aureus cells (quantified at 24 h) and the development of the mature biofilm quantified at 48 h. Patchouli and ylang-ylang essential oils inhibited mostly the initial adherence phase of S. aureus biofilm development. In the case of K. pneumoniae, all tested nanosystems exhibited similar efficiency, being active mostly against the adherence K. pneumoniae cells to the tested catheter specimens. The new nanobiosystems based on vanilla, patchouli and ylang-ylang essential oils could be of a great interest for the biomedical field, opening new directions for the design of film-coated surfaces with anti-adherence and anti-biofilm properties.
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Affiliation(s)
- Maxim Bilcu
- Microbiology Department, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Aleea Portocalelor No. 1-3, 060101 Bucharest, Romania.
| | - Alexandru Mihai Grumezescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street No. 1-7, 011061 Bucharest, Romania.
| | - Alexandra Elena Oprea
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street No. 1-7, 011061 Bucharest, Romania.
| | - Roxana Cristina Popescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street No. 1-7, 011061 Bucharest, Romania.
| | - George Dan Mogoșanu
- Department of Pharmacognosy & Phytotherapy, Faculty of Pharmacy, University of Medicine and Pharmacy of Craiova, 2 Petru Rareş Street, 200349 Craiova, Romania.
| | - Radu Hristu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania.
| | - George A Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania.
| | - Dan Florin Mihailescu
- Microbiology Department, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Aleea Portocalelor No. 1-3, 060101 Bucharest, Romania.
| | - Veronica Lazar
- Microbiology Department, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Aleea Portocalelor No. 1-3, 060101 Bucharest, Romania.
| | - Eugenia Bezirtzoglou
- Laboratory of Microbiology, Biotechnology and Hygiene, Department of Food Science and Technology, Faculty of Agricultural Development, Democritus University of Thrace, 68200 Orestiada, Greece.
| | - Mariana Carmen Chifiriuc
- Microbiology Department, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Aleea Portocalelor No. 1-3, 060101 Bucharest, Romania.
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Ditu LM, Chifiriuc MC, Bezirtzoglou E, Marutescu L, Bleotu C, Pelinescu D, Mihaescu G, Lazar V. Immunomodulatory effect of non-viable components of probiotic culture stimulated with heat-inactivated Escherichia coli and Bacillus cereus on holoxenic mice. Microb Ecol Health Dis 2014; 25:23239. [PMID: 25317114 PMCID: PMC4172693 DOI: 10.3402/mehd.v25.23239] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 05/05/2014] [Accepted: 06/16/2014] [Indexed: 12/31/2022]
Abstract
Background Competition of probiotic bacteria with other species from the intestinal microbiota involves different mechanisms that occur regardless of probiotics’ viability. The objective of this paper was to assess the cytokine serum levels in holoxenic mice after oral administration of non-viable components (NVC) of Enterococcus faecium probiotic culture stimulated with heat-inactivated Escherichia coli and Bacillus cereus in comparison to NVC of unstimulated E. faecium probiotic culture. Methods Probiotic E. faecium CMGb 16 culture, grown in the presence of heat-inactivated cultures of E. coli and B. cereus CMGB 102, was subsequently separated into supernatant (SN) and heat-inactivated cellular sediment (CS) fractions by centrifugation. Each NVC was orally administered to holoxenic mice (balb C mouse strain), in three doses, given at 24 hours. Blood samples were collected from the retinal artery, at 7, 14, and 21 days after the first administration of the NVC. The serum concentrations of IL-12 and tumor necrosis factor-alpha (TNF-α) interleukins were assessed by ELISA method. Results After the oral administration of SN component obtained from the probiotic culture stimulated with heat-inactivated cultures of B. cereus CMGB 102 and E. coli O28, the serum concentrations of IL-12 were maintained higher in the samples collected at 7 and 14 days post-administration. No specific TNF-α profile could be established, depending on stimulated or non-stimulated probiotic culture, NVC fraction, or harvesting time. Conclusion The obtained results demonstrate that non-viable fractions of probiotic bacteria, stimulated by other bacterial species, could induce immunostimulatory effects mediated by cytokines and act, therefore, as immunological adjuvants.
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Affiliation(s)
- L M Ditu
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - M C Chifiriuc
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - E Bezirtzoglou
- Laboratory of Microbiology, Biotechnology and Hygiene, Department of Food Science and Technology, Faculty of Agricultural Development, Democritus University of Thrace, Orestiada, Greece
| | - L Marutescu
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - C Bleotu
- Institute of Virology 'St. Nicolau', Bucharest, Romania
| | - D Pelinescu
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - G Mihaescu
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - V Lazar
- Microbiology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania
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Gheorghe I, Chifiriuc M, Cotar A, Lazar V. Extended-spectrum Beta-lactamase Production in Pseudomonas aeruginosa and Acinetobacter baumannii Strains: Epidemiology, Molecular Characterization and Novel Proteomics-based Diagnostic Tools. CURR PROTEOMICS 2014. [DOI: 10.2174/157016461102140917122103] [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: 11/22/2022]
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Chifiriuc M, Grumezescu A, Lazar V, Bolocan A, Triaridis S, Grigore R, Bertesteanu S. Contribution of Antimicrobial Peptides to the Development of New and Efficient Antimicrobial Strategies. CURR PROTEOMICS 2014. [DOI: 10.2174/157016461102140917121943] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Grumezescu V, Holban AM, Grumezescu AM, Socol G, Ficai A, Vasile BS, Truscă R, Bleotu C, Lazar V, Chifiriuc CM, Mogosanu GD. Usnic acid-loaded biocompatible magnetic PLGA-PVA microsphere thin films fabricated by MAPLE with increased resistance to staphylococcal colonization. Biofabrication 2014; 6:035002. [PMID: 24722318 DOI: 10.1088/1758-5082/6/3/035002] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Due to their persistence and resistance to the current therapeutic approaches, Staphylococcus aureus biofilm-associated infections represent a major cause of morbidity and mortality in the hospital environment. Since (+)-usnic acid (UA), a secondary lichen metabolite, possesses antimicrobial activity against Gram-positive cocci, including S. aureus, the aim of this study was to load magnetic polylactic-co-glycolic acid-polyvinyl alcohol (PLGA-PVA) microspheres with UA, then to obtain thin coatings using matrix-assisted pulsed laser evaporation and to quantitatively assess the capacity of the bio-nano-active modified surface to control biofilm formation by S. aureus, using a culture-based assay. The UA-loaded microspheres inhibited both the initial attachment of S. aureus to the coated surfaces, as well as the development of mature biofilms. In vitro bioevalution tests performed on the fabricated thin films revealed great biocompatibility, which may endorse them as competitive candidates for the development of improved non-toxic surfaces resistant to S. aureus colonization and as scaffolds for stem cell cultivation and tissue engineering.
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Affiliation(s)
- V Grumezescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street no 1-7, 011061 Bucharest, Romania. Lasers Department, Plasma and Radiation Physics, National Institute for Lasers, PO Box MG-36, Bucharest-Magurele, Romania
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Chifiriuc M, Grumezescu A, Grumezescu V, Bezirtzoglou E, Lazar V, Bolocan A. Biomedical Applications of Natural Polymers for Drug Delivery. CURR ORG CHEM 2014. [DOI: 10.2174/138527281802140129104525] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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