12 results on '"Pulcini, E"'
Search Results
2. L’amore coniugale: riflessioni su un sentimento moderno a partire da Rousseau
- Author
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Pulcini, E.
- Subjects
amore, Rousseau - Published
- 2017
3. Meta(l)morfosi
- Author
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Braidotti, R., Fimiani, M, Kurotschka, V., Pulcini, E, Gender Studies, Universiteit Utrecht, and Afd Media, Data & Citizenship
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Taverne ,Overig maatschappelijk onderzoek ,Literary theory, analysis and criticism ,Specialized histories (international relations, law) ,International (not English) ,Culturele activiteiten - Published
- 2004
4. An open-label, proof-of-concept study assessing the effects of bromelain-based enzymatic debridement on biofilm and microbial loads in patients with venous leg ulcers and diabetic foot ulcers.
- Author
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Snyder RJ, Singer AJ, Dove CR, Heisler S, Petusevsky H, James G, deLancey Pulcini E, Yaakov AB, Rosenberg L, Grant E, and Shoham Y
- Subjects
- Humans, Biofilms, Bromelains pharmacology, Bromelains therapeutic use, Debridement methods, Wound Healing, Proof of Concept Study, Diabetes Mellitus, Diabetic Foot therapy
- Abstract
Background: Most chronic wounds contain biofilm, and debridement remains the centerpiece of treatment. Enzymatic debridement is an effective tool in removing nonviable tissue, however, there is little evidence supporting its effect on planktonic and biofilm bacteria., Objective: This study evaluated the effects of a novel BBD agent on removal of nonviable tissue, biofilm, and microbial loads in patients with chronic ulcers., Materials and Methods: Twelve patients with DFU or VLU were treated with up to 8 once-daily applications of BBD and then followed for an additional 2 weeks. Punch biopsy specimens were collected and analyzed for biofilm, and fluorescence imaging was used to measure bacterial load., Results: Ten patients completed treatment, and 7 achieved complete debridement within a median of 2 applications (range, 2-8). By the end of the 2-week follow-up period, the mean ± SD reduction in wound area was 35% ± 38. In all 6 patients who were positive for biofilm at baseline, the biofilm was reduced to single individual or no detected microorganisms by the end of treatment. Red fluorescence for Staphylococcus aureus decreased from a mean of 1.09 cm² ± 0.58 before treatment to 0.39 cm² ± 0.25 after treatment. BBD was safe and well tolerated., Conclusion: Preliminary data suggest that BBD is safe and that it can be used to effectively debride DFU and VLU, reduce biofilm and planktonic bacterial load, and promote reduction in wound size.
- Published
- 2023
- Full Text
- View/download PDF
5. Phenotypic Modulation of Biofilm Formation in a Staphylococcus epidermidis Orthopedic Clinical Isolate Grown Under Different Mechanical Stimuli: Contribution From a Combined Proteomic Study.
- Author
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Bottagisio M, Barbacini P, Bidossi A, Torretta E, deLancey-Pulcini E, Gelfi C, James GA, Lovati AB, and Capitanio D
- Abstract
One of the major causes of prosthetic joint failure is infection. Recently, coagulase negative Staphylococcus epidermidis has been identified as an emergent, nosocomial pathogen involved in subclinical prosthetic joint infections (PJIs). The diagnosis of PJIs mediated by S. epidermidis is usually complex and difficult due to the absence of acute clinical signs derived from the host immune system response. Therefore, analysis of protein patterns in biofilm-producing S. epidermidis allows for the examination of the molecular basis of biofilm formation. Thus, in the present study, the proteome of a clinical isolate S. epidermidis was analyzed when cultured in its planktonic or sessile form to examine protein expression changes depending on culture conditions. After 24 h of culture, sessile bacteria exhibited increased gene expression for ribosomal activity and for production of proteins related to the initial attachment phase, involved in the capsular polysaccharide/adhesin, surface associated proteins and peptidoglycan biosynthesis. Likewise, planktonic S. epidermidis was able to aggregate after 24 h, synthesizing the accumulation associate protein and cell-wall molecules through the activation of the YycFG and ArlRS, two component regulatory pathways. Prolonged culture under vigorous agitation generated a stressful growing environment triggering aggregation in a biofilm-like matrix as a mechanism to survive harsh conditions. Further studies will be essential to support these findings in order to further delineate the complex mechanisms of biofilm formation of S. epidermidis and they could provide the groundwork for the development of new drugs against biofilm-related infections, as well as the identification of novel biomarkers of subclinical or chronic infections mediated by these emerging, low virulence pathogens., (Copyright © 2020 Bottagisio, Barbacini, Bidossi, Torretta, deLancey-Pulcini, Gelfi, James, Lovati and Capitanio.)
- Published
- 2020
- Full Text
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6. Searching for Bacterial Biofilm in Recurrent Cholangitis in Primary Sclerosing Cholangitis: A Case Presentation and Introduction of an Unexplored Disease Mechanism.
- Author
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Choi AY, Jalikis F, Westerhoff M, Boukhar S, Pulcini E, Damman C, and Yu L
- Abstract
Inflammation and fibrosis of the bile ducts are the defining pathological characteristics of primary sclerosing cholangitis (PSC). A previously unexplored mechanism for recurrent cholangitis, one of PSC's most common presentations, is bacterial colonization of the biliary epithelium in the form of biofilm, which may confer resistance to antibiotics and host phagocytic machinery. The aim of the current study was to assess whether bacteria could be seen on the liver explant and whether they organized in the form of biofilm. An explanted PSC liver from a 60-year-old male who suffered from recurrent cholangitis was formalin-fixed, paraffin-embedded and Gram stained. The specimens were observed under light microscopy. Neither bacteria nor biofilm were detected. We did not detect bacteria or biofilm in the liver explant of a single PSC patient with recurrent cholangitis using standard light microscopy. We suspect this may be in part due to techniques related to tissue preservation and microscopy., Competing Interests: The authors have no conflict of interests related to this publication.
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- 2018
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7. Asiatic acid and corosolic acid enhance the susceptibility of Pseudomonas aeruginosa biofilms to tobramycin.
- Author
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Garo E, Eldridge GR, Goering MG, DeLancey Pulcini E, Hamilton MA, Costerton JW, and James GA
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- Bacterial Proteins physiology, Ciprofloxacin pharmacology, Drug Synergism, Microbial Sensitivity Tests, Pentacyclic Triterpenes, Pseudomonas aeruginosa physiology, Anti-Bacterial Agents pharmacology, Biofilms drug effects, Pseudomonas aeruginosa drug effects, Tobramycin pharmacology, Triterpenes pharmacology
- Abstract
Asiatic acid and corosolic acid are two natural products identified as biofilm inhibitors in a biofilm inhibition assay. We evaluated the activities of these two compounds on Pseudomonas aeruginosa biofilms grown in rotating disk reactors (RDRs) in combination with tobramycin and ciprofloxacin. To determine the ruggedness of our systems, the antibiotic susceptibilities of these biofilms were assessed with tobramycin and ciprofloxacin. The biofilm bacteria produced in the RDR were shown to display remarkable tolerance to 10 mug/ml of ciprofloxacin, thus mimicking the tolerance observed in recalcitrant bacterial infections. These studies further demonstrate that a nonmucoid strain of P. aeruginosa can form a biofilm that tolerates ciprofloxacin at clinically relevant concentrations. Neither asiatic acid nor corosolic acid reduced the viable cell density of P. aeruginosa biofilms. However, both compounds increased the susceptibility of biofilm bacteria to subsequent treatment with tobramycin, suggesting asiatic acid and corosolic acid to be compounds that potentiate the activity of antibiotics. A similar statistical interaction was observed between ciprofloxacin and subsequent treatment with tobramycin.
- Published
- 2007
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8. Isolation of potentially pathogenic Escherichia coli O157:H7 from the Ganges River.
- Author
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Hamner S, Broadaway SC, Mishra VB, Tripathi A, Mishra RK, Pulcini E, Pyle BH, and Ford TE
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- Escherichia coli O157 growth & development, Escherichia coli O157 pathogenicity, Public Health, Sorbitol analysis, Escherichia coli O157 isolation & purification, Rivers microbiology
- Abstract
Escherichia coli serotype O157:H7 was detected among bacteria collected from the Ganges River. O157:H7 isolates tested positive for stx(1), stx(2), and eae gene sequences. Identification of potentially pathogenic isolates from extensively used source water indicates that O157:H7 may be a significant but as yet underacknowledged public health concern in India.
- Published
- 2007
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9. The study of left ventricular diastolic function by Doppler echocardiography: the essential for the clinician.
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Faggiano P, Vizzardi E, Pulcini E, Maffeo D, Fracassi F, Nodari S, and Dei Cas L
- Abstract
An abnormal diastolic function of left ventricle represents the main pathophysiological mechanism responsible for different clinical states such as restrictive cardiomyopathy, infiltrative myocardial disease and, specially, diastolic heart failure (also called heart failure with preserved systolic function), which is present in a large number of patients with a clinical picture of pulmonary congestion.Although the invasive approach, through cardiac catheterization allowing the direct measurement of left ventricular filling pressure, myocardial relaxation and compliance, is considered the gold standard for the identification of diastolic dysfunction, several noninvasive methods have been proposed for the study of left ventricular diastolic function.Doppler echocardiography represents an excellent noninvasive technique to fully characterize the diastolic function in health and disease.
- Published
- 2007
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10. Biofilms: sensing and signaling.
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Pulcini E
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- Bacterial Adhesion, Bacterial Physiological Phenomena, Bacterial Proteins genetics, Drug Resistance, Microbial, Humans, Polysaccharides, Bacterial physiology, Biofilms classification, Biofilms growth & development
- Abstract
Biofilms are a community of surface-attached microorganisms that can have far-reaching effects. Biofilms are costly to industry and affect human health in a variety of ways. Research is only now beginning to discern the complexities of biofilm formation.
- Published
- 2001
11. Induction of a heat shock factor 1-dependent stress response alters the cytotoxic activity of hsp90-binding agents.
- Author
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Bagatell R, Paine-Murrieta GD, Taylor CW, Pulcini EJ, Akinaga S, Benjamin IJ, and Whitesell L
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- 3T3 Cells, Animals, Antibiotics, Antineoplastic metabolism, Benzoquinones, Cell Transformation, Viral, DNA-Binding Proteins biosynthesis, DNA-Binding Proteins genetics, HSP90 Heat-Shock Proteins antagonists & inhibitors, Heat Shock Transcription Factors, Heat-Shock Response physiology, Humans, Lactams, Macrocyclic, Lactones metabolism, Lactones pharmacology, Macrolides, Mice, Mice, Inbred BALB C, Mice, Knockout, Mice, SCID, Papillomaviridae, Quinones metabolism, Quinones pharmacology, Rifabutin analogs & derivatives, Rifabutin metabolism, Rifabutin pharmacology, Transcription Factors, Transcriptional Activation drug effects, Xenograft Model Antitumor Assays, Antibiotics, Antineoplastic pharmacology, DNA-Binding Proteins physiology, HSP90 Heat-Shock Proteins metabolism, Heat-Shock Response drug effects
- Abstract
In addition to its classic role in the cellular stress response, heat shock protein 90 (Hsp90) plays a critical but less well appreciated role in regulating signal transduction pathways that control cell growth and survival under basal, nonstress conditions. Over the past 5 years, the antitumor antibiotics geldanamycin and radicicol have become recognized as selective Hsp90-binding agents (HBA) with a novel ability to alter the activity of many of the receptors, kinases, and transcription factors involved in these cancer-associated pathways. As a consequence of their interaction with Hsp90, however, these agents also induce a marked cellular heat shock response. To study the mechanism of this response and assess its relevance to the anticancer action of the HBA, we verified that the compounds could activate a reporter construct containing consensus binding sites for heat shock factor 1 (HSF1), the major transcriptional regulator of the vertebrate heat shock response. We then used transformed fibroblasts derived from HSF1 knock-out mice to show that unlike conventional chemotherapeutics, HBA increased the synthesis and cellular levels of heat shock proteins in an HSF1-dependent manner. Compared with transformed fibroblasts derived from wild-type mice, HSF1 knock-out cells were significantly more sensitive to the cytotoxic effects of HBA but not to doxorubicin or cisplatin. Consistent with these in vitro data, we found that systemic administration of an HBA led to marked increases in the level of Hsp72 in both normal mouse tissues and human tumor xenografts. We conclude that HBA are useful probes for studying molecular mechanisms regulating the heat shock response both in cells and in whole animals. Moreover, induction of the heat shock response by HBA will be an important consideration in the clinical application of these drugs, both in terms of modulating their cytotoxic activity as well as monitoring their biological activity in individual patients.
- Published
- 2000
12. The physical association of multiple molecular chaperone proteins with mutant p53 is altered by geldanamycin, an hsp90-binding agent.
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Whitesell L, Sutphin PD, Pulcini EJ, Martinez JD, and Cook PH
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- Animals, Benzoquinones, Carrier Proteins drug effects, Cell Line, Peptidyl-Prolyl Isomerase F, HSP70 Heat-Shock Proteins drug effects, Humans, Intramolecular Oxidoreductases, Lactams, Macrocyclic, Mice, Molecular Chaperones metabolism, Peptidylprolyl Isomerase drug effects, Phosphoproteins drug effects, Prostaglandin-E Synthases, Rats, Transcriptional Activation, Tumor Cells, Cultured, Tumor Suppressor Protein p53 genetics, Tumor Suppressor Protein p53 metabolism, Carrier Proteins metabolism, Cyclophilins, Enzyme Inhibitors pharmacology, HSP70 Heat-Shock Proteins metabolism, HSP90 Heat-Shock Proteins, Mutation, Peptidylprolyl Isomerase metabolism, Phosphoproteins metabolism, Quinones pharmacology, Tumor Suppressor Protein p53 drug effects
- Abstract
Wild-type p53 is a short-lived protein which turns over very rapidly via selective proteolysis in the ubiquitin-proteasome pathway. Most p53 mutations, however, encode for protein products which display markedly increased intracellular levels and are associated with positive tumor-promoting activity. The mechanism by which mutation leads to impairment of ubiquitination and proteasome-mediated degradation is unknown, but it has been noted that many transforming p53 mutants are found in stable physical association with molecular chaperones of the hsp70 class. To explore a possible role for aberrant chaperone interactions in mediating the altered function of mutant p53 and its intracellular accumulation, we examined the chaperone proteins which physically associate with a temperature-sensitive murine p53 mutant. In lysate prepared from A1-5 cells grown under mutant temperature conditions, hsp70 coprecipitated with p53Val135 as previously reported by others, but in addition, other well-recognized elements of the cellular chaperone machinery, including hsp90, cyclophilin 40, and p23, were detected. Under temperature conditions favoring wild-type p53 conformation, the coprecipitation of chaperone proteins with p53 was lost in conjunction with the restoration of its transcriptional activating activity. Chaperone interactions similar to those demonstrated in A1-5 cells under mutant conditions were also detected in human breast cancer cells expressing two different hot-spot mutations. To examine the effect of directly disrupting chaperone interactions with mutant p53, we made use of geldanamycin (GA), a selective hsp90-binding agent which has been shown to alter the chaperone associations regulating the function of unliganded steroid receptors. GA treatment of cells altered heteroprotein complex formation with several different mutant p53 species. It increased p53 turnover and resulted in nuclear translocation of the protein in A1-5 cells. GA did not, however, appear to restore wild-type transcriptional activating activity to mutant p53 proteins in either A1-5 cells or human breast cancer cell lines.
- Published
- 1998
- Full Text
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