2019
Severe Leptospirosis Features in the Spleen Indicate Cellular Immunosuppression Similar to That Found in Septic Shock
Duarte-Neto A, Croda J, Pagliari C, Soriano F, Nicodemo A, Duarte M. Severe Leptospirosis Features in the Spleen Indicate Cellular Immunosuppression Similar to That Found in Septic Shock. Frontiers In Immunology 2019, 10: 920. PMID: 31114579, PMCID: PMC6503108, DOI: 10.3389/fimmu.2019.00920.Peer-Reviewed Original ResearchConceptsSeptic shockLeptospirosis patientsSevere leptospirosisPulmonary hemorrhagePositive cellsRed pulpBacterial septic shockSeptic shock patientsCaspase-3-positive cellsImmune cell markersSpleen of patientsActive caspase-3 positive cellsSemi-quantitative scoreImmunomodulatory treatmentShock patientsCellular immunosuppressionIL-10Immunologic featuresImmunosuppressive stateMarked atrophyEndothelial activationControl spleensHistological featuresIntense infiltrationPlasma cells
2011
Heterologous expression of pathogen-specific genes ligA and ligB in the saprophyte Leptospira biflexaconfers enhanced adhesion to cultured cells and fibronectin
Figueira CP, Croda J, Choy HA, Haake DA, Reis MG, Ko AI, Picardeau M. Heterologous expression of pathogen-specific genes ligA and ligB in the saprophyte Leptospira biflexaconfers enhanced adhesion to cultured cells and fibronectin. BMC Microbiology 2011, 11: 129. PMID: 21658265, PMCID: PMC3133549, DOI: 10.1186/1471-2180-11-129.Peer-Reviewed Original ResearchConceptsHeterologous expressionL. biflexaFunctional genetic analysisCultured cellsPathogen-specific proteinsVirulence-associated phenotypesSaprophytic L. biflexaPathogenesis of leptospirosisImmunoglobulin-like proteinEukaryotic cellsKey virulence factorsExtracellular matrix componentsLeptospiral immunoglobulin-like (Lig) proteinsSurrogate hostLig geneLeptospira biflexa serovar patocMolecular basisReplicative plasmidGenetic analysisLig proteinsSurface localizationCell adhesionSurface proteinsVirulence factorsLigB
2008
Genome-Wide Transposon Mutagenesis in Pathogenic Leptospira Species
Murray GL, Morel V, Cerqueira GM, Croda J, Srikram A, Henry R, Ko AI, Dellagostin OA, Bulach DM, Sermswan RW, Adler B, Picardeau M. Genome-Wide Transposon Mutagenesis in Pathogenic Leptospira Species. Infection And Immunity 2008, 77: 810-816. PMID: 19047402, PMCID: PMC2632054, DOI: 10.1128/iai.01293-08.Peer-Reviewed Original ResearchConceptsTransposon mutagenesisTransposon mutantsGenome-wide transposon mutagenesisL. interrogansTransposon insertion sitesNovel virulence factorsEssential genesHypothetical genesGene functionGenome sequenceTransposon insertionGene disruptionGenetic manipulationDifferent genesGenetic analysisHeme biosynthesisPathogenic Leptospira speciesMutantsSequence analysisGenesVirulence factorsInsertional hot spotsLocation of insertionGenomeMutagenesis
2007
The terminal portion of leptospiral immunoglobulin-like protein LigA confers protective immunity against lethal infection in the hamster model of leptospirosis
Silva É, Medeiros MA, McBride AJ, Matsunaga J, Esteves GS, Ramos JG, Santos CS, Croda J, Homma A, Dellagostin OA, Haake DA, Reis MG, Ko AI. The terminal portion of leptospiral immunoglobulin-like protein LigA confers protective immunity against lethal infection in the hamster model of leptospirosis. Vaccine 2007, 25: 6277-6286. PMID: 17629368, PMCID: PMC1994161, DOI: 10.1016/j.vaccine.2007.05.053.Peer-Reviewed Original ResearchConceptsMajor public health problemRobust antibody responseGolden Syrian hamstersPublic health problemPotential intervention strategiesLethal inoculumSurface-exposed determinantsProtective immunityAntibody responseSterilizing immunityLethal infectionHamster modelVaccine candidatesSubunit vaccineCompanion animalsHealth problemsVeterinary diseasesSyrian hamstersLeptospiral immunoglobulin-like (Lig) proteinsLeptospira interrogansLeptospirosisL. interrogansIntervention strategiesVirulence factorsImmunoglobulin-like proteinLeptospira Immunoglobulin-Like Proteins as a Serodiagnostic Marker for Acute Leptospirosis
Croda J, Ramos JG, Matsunaga J, Queiroz A, Homma A, Riley LW, Haake DA, Reis MG, Ko AI. Leptospira Immunoglobulin-Like Proteins as a Serodiagnostic Marker for Acute Leptospirosis. Journal Of Clinical Microbiology 2007, 45: 1528-1534. PMID: 17360842, PMCID: PMC1865864, DOI: 10.1128/jcm.02344-06.Peer-Reviewed Original ResearchConceptsSerodiagnostic markerDays of illnessLarge disease burdenLeptospira immunoglobulin-like proteinAcute infectionClinical presentationAcute leptospirosisIgM antibodiesAntibody responseDisease burdenPutative virulence determinantsIgM enzymeTimely diagnosisSevere formHealthy individualsMicroagglutination testPatientsUrban outbreaksHigh mortalityInfectious diseasesPathogenic serovarsLeptospirosisImmunosorbent assaySerumSpecific markersMonoclonal Antibodies Against LipL32, The Major Outer Membrane Protein of Pathogenic Leptospira Production, Characterization, and Testing in Diagnostic Applications
Fernandes C, Seixas FK, Coutinho ML, Vasconcellos F, Seyffert N, Croda J, McBride AJ, Ko AI, Dellagostin OA, Aleixo J. Monoclonal Antibodies Against LipL32, The Major Outer Membrane Protein of Pathogenic Leptospira Production, Characterization, and Testing in Diagnostic Applications. Monoclonal Antibodies In Immunodiagnosis And Immunotherapy 2007, 26: 35-41. PMID: 17316084, DOI: 10.1089/hyb.2006.033.Peer-Reviewed Original ResearchConceptsMembrane proteinsNative proteinMajor Outer Membrane ProteinOuter membrane lipoproteinOuter Membrane ProteinOuter membrane proteinsOuter membraneMembrane lipoproteinWide antigenic diversityBacterial cellsLeptospiral cellsIntact bacteriaProteinProtein enzyme-linked immunosorbent assayAntigenic diversityPolymerase chain reaction amplificationHeat-treated cellsMonoclonal antibodiesRecombinant formChain reaction amplificationEnzyme-linked immunosorbent assayFluorescein isothiocyanateCellsMurine monoclonal antibodiesPathogenic Leptospira
2003
Pathogenic Leptospira species express surface‐exposed proteins belonging to the bacterial immunoglobulin superfamily
Matsunaga J, Barocchi MA, Croda J, Young TA, Sanchez Y, Siqueira I, Bolin CA, Reis MG, Riley LW, Haake DA, Ko AI. Pathogenic Leptospira species express surface‐exposed proteins belonging to the bacterial immunoglobulin superfamily. Molecular Microbiology 2003, 49: 929-946. PMID: 12890019, PMCID: PMC1237129, DOI: 10.1046/j.1365-2958.2003.03619.x.Peer-Reviewed Original ResearchConceptsLig proteinsMammalian cell invasionLambda phage clonesLipoprotein signal peptideYersinia pseudotuberculosis invasinSurface-exposed proteinsBacterial immunoglobulin-like domainImmunoglobulin-like domainsHost cell attachmentLeptospira speciesImmunocytochemical electron microscopySurface-expressed proteinsDomain proteinsSaprophytic Leptospira speciesDomain repeatsLeptospiral pathogenesisRNA transcript expressionSignal peptideLig geneLigB genesHost infectionExpression libraryPathogenic Leptospira speciesTandem repeatsBacterial immunoglobulin
2001
Leptospiral Proteins Recognized during the Humoral Immune Response to Leptospirosis in Humans
Guerreiro H, Croda J, Flannery B, Mazel M, Matsunaga J, Reis M, Levett P, Ko A, Haake D. Leptospiral Proteins Recognized during the Humoral Immune Response to Leptospirosis in Humans. Infection And Immunity 2001, 69: 4958-4968. PMID: 11447174, PMCID: PMC98588, DOI: 10.1128/iai.69.8.4958-4968.2001.Peer-Reviewed Original ResearchConceptsHumoral immune responseImmune responseNatural infectionLeptospiral proteinsInfection-associated antigenConvalescent-phase seraPositive reactionConvalescent phaseHumoral responseHealthy individualsHuman leptospirosisControl individualsVaccine designImmunodominant antigensQuantitative immunoblot analysisTwo-dimensional immunoblotsProtein antigensPathogenic leptospiral strainsGenus LeptospiraInfectionAntigenLeptospirosisSerumImmunodominant proteinsPatients