Search results for "Polymyxin"

showing 9 items of 9 documents

Human apolipoprotein A-I natural variants: molecular mechanisms underlying amyloidogenic propensity

2012

Human apolipoprotein A-I (apoA-I)-derived amyloidosis can present with either wild-type (Wt) protein deposits in atherosclerotic plaques or as a hereditary form in which apoA-I variants deposit causing multiple organ failure. More than 15 single amino acid replacement amyloidogenic apoA-I variants have been described, but the molecular mechanisms involved in amyloid-associated pathology remain largely unknown. Here, we have investigated by fluorescence and biochemical approaches the stabilities and propensities to aggregate of two disease-associated apoA-I variants, apoA-IGly26Arg, associated with polyneuropathy and kidney dysfunction, and apoA-ILys107-0, implicated in amyloidosis in severe…

ProteomicsProtein Foldinglcsh:MedicineProtein aggregationpolymyxinsBiochemistryProtein Structure SecondaryMiceProtein structureneutrophilsMolecular Cell Biologypolycyclic compoundslcsh:ScienceCellular Stress ResponsesMultidisciplinaryProtein StabilityAmyloidosisCiencias QuímicasfluorescenseCell biologymacrophagesBiochemistryToxicityMedicineProtein foldinglipids (amino acids peptides and proteins)medicine.symptomPolyneuropathyResearch ArticleProtein StructureMedicinaLipoproteinsImmunologyBiophysicsInflammationAmyloidogenic ProteinsBiologyProtein ChemistryMicrobiologyCell Lineprotein aggregationmacrophage activationmedicineAnimalsHumansoligomersProtein InteractionsBiologyInflammationamyloidosisApolipoprotein A-IMacrophageslcsh:RImmunityProteinsnutritional and metabolic diseasesmedicine.diseaseApolipoproteinsAmino Acid SubstitutionCell cultureinflammationCiencias Médicaslcsh:QClinical ImmunologyMutant ProteinspolyneuropathyProtein Multimerization
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Antibiotic treatment of infections caused by carbapenem-resistant Gram-negative bacilli: an international ESCMID cross-sectional survey among infecti…

2018

ESGAP, ESGBIS, ESGIE and the CRGNB treatment survey study group.

0301 basic medicineAcinetobacter baumanniiCarbapenemAntibioticsDrug ResistanceDrug resistanceTigecyclineAcinetobacter baumannii; Carbapenem; Carbapenem-resistant Gram-negative bacilli; Combination therapy; Enterobacteriaceae; Polymyxin; Pseudomonas aeruginosa; SurveyPolymyxin0302 clinical medicineSurveys and Questionnairespolycyclic compounds030212 general & internal medicineAcinetobacter baumannii; Carbapenem; Carbapenem-resistant Gram-negative bacilli; Combination therapy; Enterobacteriaceae; Polymyxin; Pseudomonas aeruginosa; Survey; Anti-Bacterial Agents; Carbapenems; Cross Infection; Cross-Sectional Studies; Drug Resistance Bacterial; Gram-Negative Bacteria; Gram-Negative Bacterial Infections; Hospitals; Humans; Microbial Sensitivity Tests; Surveys and QuestionnairesSurveyCarbapenemAcinetobacter baumannii; Carbapenem; Carbapenem-resistant Gram-negative bacilli; Combination therapy; Enterobacteriaceae; Polymyxin; Pseudomonas aeruginosa; Survey; Anti-Bacterial Agents; Carbapenems; Cross Infection; Cross-Sectional Studies; Drug Resistance Bacterial; Gram-Negative Bacteria; Gram-Negative Bacterial Infections; Hospitals; Humans; Microbial Sensitivity Tests; Surveys and Questionnaires; Microbiology (medical); Infectious DiseasesCross InfectionbiologyMicrobial Sensitivity TestCarbapenem-resistant Gram-negative bacilliBacterialantibiotic management carbapenem-resistant Gram-negative bacteriaGeneral MedicineHospitals3. Good healthAcinetobacter baumanniiAnti-Bacterial AgentsInfectious DiseasesPseudomonas aeruginosamedicine.drugHumanMicrobiology (medical)medicine.medical_specialtymedicine.drug_class030106 microbiologyMicrobial Sensitivity TestsFosfomycincarbapenem-resistant Gram-negative bacteria03 medical and health sciencesHospitalEnterobacteriaceaeInternal medicineAnti-Bacterial AgentDrug Resistance BacterialGram-Negative BacteriamedicineGram-Negative Bacterial InfectionHumansCombination therapyCross-Sectional Studiebusiness.industrybiochemical phenomena metabolism and nutritionbiology.organism_classificationbacterial infections and mycosesCross-Sectional StudiesCarbapenemsInfectious disease (medical specialty)Carbapenem-resistant gram-negative bacilli[SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologieantibiotic managementbusinessGram-Negative Bacterial InfectionsRifampicin
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The Efflux Pump MexXY/OprM Contributes to the Tolerance and Acquired Resistance of Pseudomonas aeruginosa to Colistin

2020

The intrinsic resistance of Pseudomonas aeruginosa to polymyxins in part relies on the addition of 4-amino-4-deoxy-l-arabinose (Ara4N) molecules to the lipid A of lipopolysaccharide (LPS), through induction of operon arnBCADTEF-ugd (arn) expression. As demonstrated previously, at least three two-component regulatory systems (PmrAB, ParRS, and CprRS) are able to upregulate this operon when bacteria are exposed to colistin. In the present study, gene deletion experiments with the bioluminescent strain PAO1::lux showed that ParRS is a key element in the tolerance of P. aeruginosa to this last-resort antibiotic (i.e., resistance to early drug killing). Other loci of the ParR regulon, such as th…

medicine.drug_classOperonPolymyxinMutantMicrobial Sensitivity Testsmedicine.disease_causeMicrobiologyLipid A03 medical and health sciencesBacterial ProteinsMechanisms of ResistanceDrug Resistance BacterialmedicinePharmacology (medical)ComputingMilieux_MISCELLANEOUS030304 developmental biologyPharmacology0303 health sciencesColistin030306 microbiologyPseudomonas aeruginosaChemistryMembrane Transport ProteinsGene Expression Regulation BacterialAnti-Bacterial AgentsInfectious DiseasesRegulonPseudomonas aeruginosa[SDE]Environmental SciencesColistinlipids (amino acids peptides and proteins)EffluxGene DeletionBacterial Outer Membrane Proteinsmedicine.drugAntimicrobial Agents and Chemotherapy
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Isolation and partial characterization of antagonistic peptides produced by Paenibacillus sp. strain B2 isolated from the sorghum mycorrhizosphere.

2005

ABSTRACT Paenibacillus sp. strain B2, isolated from the mycorrhizosphere of sorghum colonized by Glomus mosseae , produces an antagonistic factor. This factor has a broad spectrum of activity against gram-positive and gram-negative bacteria and also against fungi. The antagonistic factor was isolated from the bacterial culture medium and purified by cation-exchange, reverse-phase, and size exclusion chromatography. The purified factor could be separated into three active compounds following characterization by amino acid analysis and by combined reverse-phase chromatography and mass spectrometry (liquid chromatography-mass spectrometry and mass spectrometry-mass spectrometry). The first com…

Polymyxin B1medicine.drug_classPolymyxinSize-exclusion chromatographyPeptideTripeptideMicrobial Sensitivity TestsGram-Positive BacteriaApplied Microbiology and BiotechnologyPeptides CyclicPlant RootsPaenibacillusFusariumAntibiosisGram-Negative BacteriamedicineEnvironmental MicrobiologyPolymyxinsThreonineSoil MicrobiologySorghumchemistry.chemical_classificationEcologyMolecular massbiologybiology.organism_classificationBiochemistrychemistryFood ScienceBiotechnologyApplied and environmental microbiology
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The major allergen of the Parietaria pollen contains an LPS-binding region with immuno-modulatory activity

2013

Background The major allergens in Parietaria pollen, Par j 1 and Par j 2, have been identified as lipid transfer proteins. The family of the Par j 1 allergens is composed of two isoforms, which differ by the presence of a 37 amino acid peptide (Par37) exclusive to the Par j 1.0101 isoform. The goal of this study was to elucidate the biological properties of the Par37 peptide. Methods In silico analysis, spectrofluorimetric experiments and in vitro cell culture assays were used to identify the biological properties of Par37. In addition, a mouse model of sensitization was used to study the influence of Par37 in the murine immune response. Results In silico analysis predicted that Par37 displ…

LipopolysaccharidesGene isoformParietariaIn silicoMolecular Sequence DataImmunologySettore BIO/11 - Biologia MolecolarePeptideBiologyAntibodiesInterferon-gammaMiceIn vivoAnimalsHumansImmunologic FactorsImmunology and AllergyAmino Acid SequencePlant ProteinsPolymyxin Bchemistry.chemical_classificationanimal modelallergens; animal models; environment; pollens.Allergensbiology.organism_classificationIn vitroAmino acidParietariachemistryBiochemistryLeukocytes MononuclearCytokinesPollenpollens.FemalePeptidesenvironmentSequence AlignmentPlant lipid transfer proteinsSpleenallergenProtein Binding
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Pharmacological characterisation of a new model of antigen-induced pulmonary late-phase reaction in the conscious guinea pig which uses additional po…

1996

The aim of the present study was to develop a new model of allergic late-phase reaction in the airways of conscious guinea pigs (GPs) and to characterise it by pharmacological intervention. GPs were pretreated with cyclophosphamide and sensitized with ovalbumin (OA) in Al(OH)3. Weekly inhalations of polymyxin B were performed before and during sensitization and continued throughout the study period. Under cover of 10 mg/kg i.p. mepyramine all GPs still exhibited a pronounced immediate reaction (IR), peaking during the first 15 min after OA. Nine out of 15 GPs demonstrated, during screening, a reproducible (twice) second phase (late phase reaction (LPR)] of decreased airflow and tidal volume…

Malemedicine.medical_specialtyOvalbuminGuinea PigsImmunologyMepyramineGuinea pigInternal medicineAdministration InhalationmedicineAnimalsHypersensitivity DelayedAntigensSensitizationPolymyxin BPyrilaminePharmacologyInhalationbiologyChemistryAzepinesTriazolesAsthmaAnti-Bacterial AgentsDisease Models AnimalOvalbuminEndocrinologymedicine.anatomical_structureMethylprednisoloneHistamine H1 Antagonistsbiology.proteinPolymyxin BGlucocorticoidmedicine.drugJournal of Lipid Mediators and Cell Signalling
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Drug resistance patterns of bacteria isolated from patients with nosocomial pneumonia at Tehran hospitals during 2009-2011

2013

Introduction: Nosocomial pneumonia remains an important cause of mortality and morbidity worldwide. Surveillance programs play an important role in the identification of common etiologic agents and local patterns of antimicrobial resistance. Methodology: In this study we determined the frequency and antimicrobial susceptibility of pathogens isolated from patients with nosocomial pneumonia during 2009 to 2011. Results: A total of 642 bacteria were isolated from 516 suspected samples. Acinetobacter baumannii (21.1%, n = 136), was the commonest isolated pathogen followed by Pseudomonas aeruginosa (17.4%, n = 112) , Staphylococcus aureus (15.8%, n = 102) and enterococci (8.4% n = 54). The most …

Acinetobacter baumanniiSettore MED/07 - Microbiologia E Microbiologia ClinicaPenicillanic AcidDrug resistanceIranmedicine.disease_causechemistry.chemical_compoundLevofloxacinDrug Resistance Multiple BacterialPrevalenceRespiratory Tract InfectionsPolymyxin BCross InfectionbiologyCeftriaxoneGeneral MedicineHospitalsAcinetobacter baumanniiAnti-Bacterial AgentsInfectious DiseasesPiperacillin Tazobactam Drug CombinationPseudomonas aeruginosaCeftriaxonemedicine.drugMethicillin-Resistant Staphylococcus aureusStaphylococcus aureusMicrobial Sensitivity TestsMicrobiologyTazobactamMicrobiologyAntibiotic resistanceAcinetobacter baumanniiiVirologymedicinePneumonia BacterialHumansTehran hospitalsGram-Positive Bacterial InfectionsPiperacillindrug resistancebusiness.industryPseudomonas aeruginosanosocomial pneumoniaSputumbiochemical phenomena metabolism and nutritionbacterial infections and mycosesbiology.organism_classificationchemistrynosocomial pneumonia; drug resistance; Acinetobacter baumanniii; Pseudomonas aeruginosa; Tehran hospitalsLinezolidParasitologybusinessGram-Negative Bacterial Infections
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Double copies of blaKPC-3::Tn4401a on an IncX3 plasmid in Klebsiella pneumoniae successful clone ST512 from Italy

2015

ABSTRACT A carbapenem-resistant sequence type 512 (ST512) Klebsiella pneumoniae carbapenemase 3 (KPC-3)-producing K. pneumoniae strain showing a novel variant plasmid content was isolated in Palermo, Italy, in 2014. ST512 is a worldwide successful clone associated with the spread of bla KPC genes located on the IncFIIk pKpQIL plasmid. In our ST512 strain, the bla KPC-3 gene was unusually located on an IncX3 plasmid, whose complete sequence was determined. Two copies of bla KPC-3 ::Tn 4401a caused by intramolecular transposition events were detected in the plasmid.

transposonsequence analysispolymerase chain reactionDrug ResistanceGene DosageSettore MED/42 - Igiene Generale E Applicatabacterial proteinbeta-Lactamaseopen reading framecarbapenemasePlasmidminocyclineplasmid DNAmeropenemPharmacology (medical)geneticscolistincefpodoximeceftazidime610 Medicine & healthCarbapenemBacterialpolymyxin Btimentingene expression regulationbacteriumKlebsiella pneumoniae carbapenemase 3 producing Klebsiella pneumoniae3. Good healthantiinfective agentmicrobial sensitivity testKlebsiella pneumoniaeItalypriority journaltigecyclineMultipleclone (Java method)cefotaxime030106 microbiologyKlebsiella pneumoniae carbapenemase 3tobramycinMicrobial Sensitivity Testsgentamicinpiperacillin plus tazobactamchemistryGene dosageArticleMicrobiology03 medical and health sciencesComplete sequenceClone CellOpen Reading FramesertapenemBacterial Proteinsmultidrug resistanceextensively drug resistant bacteriumAnti-Bacterial AgentcefepimePharmacologylevofloxacinmicrobiologycefoxitinbiochemical phenomena metabolism and nutritionbacterial infections and mycosesVirologyAnti-Bacterial Agents; Bacterial Proteins; Carbapenems; Clone Cells; Drug Resistance Multiple Bacterial; Gene Dosage; Italy; Klebsiella Infections; Klebsiella pneumoniae; Microbial Sensitivity Tests; Open Reading Frames; Plasmids; beta-Lactamases; DNA Transposable Elements; Gene Expression Regulation Bacterial; Pharmacology (medical); Pharmacology; Infectious Diseasesantibiotic sensitivityClone CellsKlebsiella InfectionsceftriaxoneCarbapenemsbacterial genetics0301 basic medicinemolecular cloningSettore MED/07 - Microbiologia E Microbiologia ClinicaKlebsiella pneumoniaeTransposition (music)Drug Resistance Multiple Bacterialpolycyclic compoundsgenetic screeningcell clonecarbapenem derivativeKlebsiella infectionunclassified drugAnti-Bacterial AgentsInfectious Diseasesbacterial genePlasmidsenzymologydoripenemBiologyminimum inhibitory concentrationbeta-Lactamasesbeta lactamaseMechanisms of ResistanceciprofloxacinAmikacin; aztreonam; carbapenemase; cefepime; cefotaxime; cefoxitin; cefpodoxime; ceftazidime; ceftriaxone; ciprofloxacin; colistin; cotrimoxazole; doripenem; doxycycline; ertapenem; gentamicin; imipenem; Klebsiella pneumoniae carbapenemase 3; levofloxacin; meropenem; minocycline; piperacillin plus tazobactam; plasmid DNA; polymyxin B; tigecycline; timentin; tobramycin; unclassified drug; antiinfective agent; bacterial protein; beta lactamase; carbapenem derivative; transposon antibiotic sensitivity; Article; bacterial gene; bacterial genetics; bacterial strain; bacterium; bacterium detection; bacterium isolation; Escherichia coli; extensively drug resistant bacterium; gene dosage; genetic screening; Italy; Klebsiella pneumoniae; Klebsiella pneumoniae carbapenemase 3 producing Klebsiella pneumoniae; minimum inhibitory concentration; molecular cloning; nonhuman; polymerase chain reaction; priority journal; sequence analysis; cell clone; chemistry; drug effects; enzymology; gene expression regulation; genetics; isolation and purification; Klebsiella infection; Klebsiella pneumoniae; metabolism; microbial sensitivity test; microbiology; multidrug resistance; open reading frame; plasmid; transposon Anti-Bacterial Agents; Bacterial Proteins; beta-Lactamases; Carbapenems; Clone Cells; DNA Transposable Elements; Drug Resistance Multiple Bacterial; Gene Dosage; Gene Expression Regulation Bacterial; Italy; Klebsiella Infections; Klebsiella pneumoniae; Microbial Sensitivity Tests; Open Reading Frames; Plasmidsplasmidbacterium isolationEscherichia coliGeneAmikacinbacterium detectionnonhumandoxycyclineisolation and purificationGene Expression Regulation Bacterialbiology.organism_classificationbacterial straincotrimoxazoleOpen reading frameDNA Transposable Elementdrug effectsDNA Transposable Elementsmetabolismaztreonamimipenem
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Impact of a new bio-pesticide produced by Paenibacillus sp. strain B2 on the genetic structure and density of soil bacterial communities

2007

The effect of paenimyxin, a new biopesticide produced by Paenibacillus sp. strain B2, on the density of soil bacterial communities was assessed by colony counting and by 16S rDNA and nirK quantitative polymerase chain reaction (PCR). Paenimyxin had a negative effect on the bacterial colony-forming unit (CFU) number, which was significantly reduced 2 and 4 days after treatment. The effect of paenimyxin on cultivatable bacteria was negligible 7 days after treatment. Approximately 107 16S rDNA sequences per gram of soil (dry weight) were detected by quantitative PCR in all samples. Paenimyxin did not affect the quantification of 16S rDNA or of the denitrifying bacterial community. In addition,…

[SDV]Life Sciences [q-bio]QUANTITATIVE POLYMERASE CHAIN REACTIONMicrobiologyBIOPESTICIDE03 medical and health sciencesPaenibacillusDenitrifying bacteriaDry weightRNA Ribosomal 16SPAENIMYXINDNA Ribosomal SpacerFood sciencePolymyxinsPesticidesSoil Microbiology030304 developmental biology0303 health sciencesbiologyStrain (chemistry)Bacteria030306 microbiologyGeneral MedicineSequence Analysis DNAbiology.organism_classification16S ribosomal RNADNA Fingerprinting3. Good healthBiopesticideMicrobial population biologySOIL DEOXYRIBONUCLEIC ACIDInsect Science[SDE]Environmental SciencesAgronomy and Crop ScienceBacteria
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