2018
Circadian Rhythms Influence the Severity of Sepsis in Mice via a TLR2-Dependent, Leukocyte-Intrinsic Mechanism
Heipertz EL, Harper J, Lopez CA, Fikrig E, Hughes ME, Walker WE. Circadian Rhythms Influence the Severity of Sepsis in Mice via a TLR2-Dependent, Leukocyte-Intrinsic Mechanism. The Journal Of Immunology 2018, 201: ji1701677. PMID: 29760192, PMCID: PMC9351006, DOI: 10.4049/jimmunol.1701677.Peer-Reviewed Original ResearchConceptsImmune cellsZT 19C57BL/6 miceWorse outcomesTLR2 agonist lipoteichoic acidCircadian rhythmTLR2 knockout miceFemale C57BL/6 miceMale C57BL/6 miceSeverity of sepsisBone marrow chimerasTLR2-dependent mechanismIL-6 productionTLR2-DependentSepsis severityCecal ligationSepsis phenotypesSepsisC57BL/6 cellsSimilar outcomesMiceMouse cecumLipoteichoic acidMurine macrophagesCLP
2011
Dengue Virus Capsid Protein Binds Core Histones and Inhibits Nucleosome Formation in Human Liver Cells
Colpitts TM, Barthel S, Wang P, Fikrig E. Dengue Virus Capsid Protein Binds Core Histones and Inhibits Nucleosome Formation in Human Liver Cells. PLOS ONE 2011, 6: e24365. PMID: 21909430, PMCID: PMC3164731, DOI: 10.1371/journal.pone.0024365.Peer-Reviewed Original ResearchConceptsDENV infectionDENV CHuman liver cellsDengue virusLiver cellsDengue virus infectionTime-dependent mannerSpecific antiviralsVirus infectionInfectionAlters levelsSerious human diseasesInteresting new roleViral RNANuclear presenceMature virus particlesVirus particlesHuman diseasesFlaviviral replicationCellsCellular responsesCapsid proteinStructural proteinsVaccine
2010
A Paradoxical Role for Neutrophils in the Pathogenesis of West Nile Virus
Bai F, Kong KF, Dai J, Qian F, Zhang L, Brown CR, Fikrig E, Montgometry R. A Paradoxical Role for Neutrophils in the Pathogenesis of West Nile Virus. The Journal Of Infectious Diseases 2010, 202: 1804-1812. PMID: 21050124, PMCID: PMC3053000, DOI: 10.1086/657416.Peer-Reviewed Original ResearchConceptsWest Nile virusPolymorphonuclear leukocytesWNV infectionNile virusHigh viremiaViral clearanceEarly deathEarly infectionControl groupProtective roleBiphasic responseInnate immunityViral pathogenesisInfectionMiceViremiaPathogenesisParadoxical roleEfficient replicationVirusCXCL1CXCL2ChemokinesCXCR2Neutrophils
2008
Extrinsic incubation periods for horizontal and vertical transmission of West Nile virus by Culex pipiens pipiens (Diptera: Culicidae).
Anderson J, Main A, Delroux K, Fikrig E. Extrinsic incubation periods for horizontal and vertical transmission of West Nile virus by Culex pipiens pipiens (Diptera: Culicidae). Journal Of Medical Entomology 2008, 45: 445-51. PMID: 18533438, DOI: 10.1603/0022-2585(2008)45[445:eipfha]2.0.co;2.Peer-Reviewed Original ResearchConceptsWest Nile virusInfection rateVertical transmissionNile virusMinimal infection rateHighest minimum infection rateVertical transmission rateMinimum infection rateWNV 1Extrinsic incubation periodDay 13Day 16Extrinsic incubationMembrane feederCulex pipiens pipiens L.Horizontal transmission ratesInitiation of amplificationFirst bloodmealVirusSurvival of virusesMiceFemalesHamstersHorizontal transmissionWNVExtrinsic Incubation Periods for Horizontal and Vertical Transmission of West Nile Virus by Culex pipiens pipiens (Diptera: Culicidae)
Anderson JF, Main AJ, Delroux K, Fikrig E. Extrinsic Incubation Periods for Horizontal and Vertical Transmission of West Nile Virus by Culex pipiens pipiens (Diptera: Culicidae). Journal Of Medical Entomology 2008, 45: 445-451. DOI: 10.1093/jmedent/45.3.445.Peer-Reviewed Original ResearchConceptsWest Nile virusInfection rateVertical transmissionNile virusMinimal infection rateHighest minimum infection rateVertical transmission rateMinimum infection rateWNV 1Extrinsic incubation periodDay 13Day 16Extrinsic incubationMembrane feederHorizontal transmission ratesCulex pipiens pipiens L.Initiation of amplificationFirst bloodmealVirusSurvival of virusesMiceFemalesHamstersHorizontal transmissionWNV
2007
c-Jun NH2-Terminal Kinase 2 Inhibits Gamma Interferon Production during Anaplasma phagocytophilum Infection
Pedra JH, Mattner J, Tao J, Kerfoot SM, Davis RJ, Flavell RA, Askenase PW, Yin Z, Fikrig E. c-Jun NH2-Terminal Kinase 2 Inhibits Gamma Interferon Production during Anaplasma phagocytophilum Infection. Infection And Immunity 2007, 76: 308-316. PMID: 17998313, PMCID: PMC2223674, DOI: 10.1128/iai.00599-07.Peer-Reviewed Original ResearchConceptsIFN-gamma productionA. phagocytophilum infectionPhagocytophilum infectionIFN-gammaJnk2-null miceNatural killer T cellsA. phagocytophilumKiller T cellsIFN-gamma releaseIFN-gamma secretionGamma interferon productionT cell agonistsAnaplasma phagocytophilum infectionT cellsEarly eradicationGamma interferonInterferon productionInfectionC-Jun NH2-terminal kinase-2Inhibitory effectElevated levelsMiceAnaplasma phagocytophilumPhagocytophilumKinase 2
2005
Effects of Anaplasma phagocytophilum on Host Cell Ferritin mRNA and Protein Levels
Carlyon JA, Ryan D, Archer K, Fikrig E. Effects of Anaplasma phagocytophilum on Host Cell Ferritin mRNA and Protein Levels. Infection And Immunity 2005, 73: 7629-7636. PMID: 16239567, PMCID: PMC1273867, DOI: 10.1128/iai.73.11.7629-7636.2005.Peer-Reviewed Original ResearchConceptsFerritin protein levelsProtein levelsHL-60 cellsA. phagocytophilumAnaplasma phagocytophilumSerum-opsonized zymosanHuman granulocytic anaplasmosisA. phagocytophilum infectionInfected HL-60 cellsTime-dependent mannerObligate intracellular bacteriumFerritin levelsInfected miceA. phagocytophilum-infected miceMajor intracellular iron storage proteinFerritin heavy chainHuman promyelocytic HL-60 cellsNADPH oxidase assemblyNeutrophilsPromyelocytic HL-60 cellsMRNA expressionPhagocytophilum infectionIntracellular pathogensGranulocytic anaplasmosisIntracellular bacterium
2004
OspC facilitates Borrelia burgdorferi invasion of Ixodes scapularis salivary glands
Pal U, Yang X, Chen M, Bockenstedt LK, Anderson JF, Flavell RA, Norgard MV, Fikrig E. OspC facilitates Borrelia burgdorferi invasion of Ixodes scapularis salivary glands. Journal Of Clinical Investigation 2004, 113: 220-230. PMID: 14722614, PMCID: PMC311436, DOI: 10.1172/jci19894.Peer-Reviewed Original ResearchMeSH KeywordsActinsAnimalsAntigens, BacterialBacterial Outer Membrane ProteinsBorrelia burgdorferiDisease Models, AnimalEnzyme-Linked Immunosorbent AssayGenetic VectorsImmunoglobulin Fab FragmentsIxodesLipoproteinsLyme DiseaseMiceMice, SCIDMicroscopy, ConfocalModels, GeneticPlasmidsRecombinant ProteinsReverse Transcriptase Polymerase Chain ReactionSalivary GlandsSpirochaetalesTime FactorsUp-RegulationConceptsTick salivary glandsWild-type B. burgdorferiArthropod vectorsWild-type spirochetesTransmission of spirochetesB. burgdorferiMajor surface lipoproteinMammalian hostsGene expressionSalivary glandsOspC geneSurface lipoproteinsSalivary gland colonizationInfectious cloneOuter surface protein CGland colonizationSurface protein CTick gutMutantsOspCUnfed ticksInvasionCritical stepBorrelia burgdorferiSpirochetes
2001
Salp25D, an Ixodes scapularis Antioxidant, Is 1 of 14 Immunodominant Antigens in Engorged Tick Salivary Glands
Das S, Banerjee G, DePonte K, Marcantonio N, Kantor F, Fikrig E. Salp25D, an Ixodes scapularis Antioxidant, Is 1 of 14 Immunodominant Antigens in Engorged Tick Salivary Glands. The Journal Of Infectious Diseases 2001, 184: 1056-1064. PMID: 11574922, DOI: 10.1086/323351.Peer-Reviewed Original ResearchAmino Acid SequenceAnimalsAntigensAntioxidantsCattleCloning, MolecularConsensus SequenceEnzyme-Linked Immunosorbent AssayFemaleGene LibraryGlutathione PeroxidaseGuinea PigsHumansImmunoglobulin GInsect ProteinsIxodesMiceMice, Inbred C3HMolecular Sequence DataNematodaRabbitsRNA, MessengerSalivary GlandsSequence Homology, Amino AcidSpecies SpecificityTime Factors
2000
Gamma Interferon Dominates the Murine Cytokine Response to the Agent of Human Granulocytic Ehrlichiosis and Helps To Control the Degree of Early Rickettsemia
Akkoyunlu M, Fikrig E. Gamma Interferon Dominates the Murine Cytokine Response to the Agent of Human Granulocytic Ehrlichiosis and Helps To Control the Degree of Early Rickettsemia. Infection And Immunity 2000, 68: 1827-1833. PMID: 10722570, PMCID: PMC97354, DOI: 10.1128/iai.68.4.1827-1833.2000.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsBacteremiaConcanavalin ACytokinesDisease ProgressionDose-Response Relationship, DrugEhrlichiosisEnzyme-Linked Immunosorbent AssayFemaleHL-60 CellsHumansImmunoglobulin GInterferon-gammaMiceMice, Inbred C3HNeutrophilsReverse Transcriptase Polymerase Chain ReactionRickettsiaSpleenTime FactorsT-LymphocytesConceptsIFN-gamma-deficient miceHuman granulocytic ehrlichiosisIFN-gamma levelsDay 8Cytokine responsesIFN-gammaGamma interferonCells/HGE bacteriaGranulocytic ehrlichiosisIFN-gamma-independent mechanismMurine cytokine responsesTime pointsAgent of HGEMore IFN-gammaC3H/HeNLess interleukin-4IFN-gamma responsesMurine infection modelLater time pointsObligate intracellular bacteriumTh1 phenotypeC57BL/6 miceDNA burdenImmunocompetent mice
1998
Prevention of Borrelia burgdorferi transmission in guinea pigs by tick immunity.
Nazario S, Das S, de Silva AM, Deponte K, Marcantonio N, Anderson JF, Fish D, Fikrig E, Kantor FS. Prevention of Borrelia burgdorferi transmission in guinea pigs by tick immunity. American Journal Of Tropical Medicine And Hygiene 1998, 58: 780-5. PMID: 9660463, DOI: 10.4269/ajtmh.1998.58.780.Peer-Reviewed Original Research
1997
Protective and Arthritis-Resolving Activity in Sera of Mice Infected with Borrelia burgdorferi
Barthold S, Feng S, Bockenstedt L, Fikrig E, Feen K. Protective and Arthritis-Resolving Activity in Sera of Mice Infected with Borrelia burgdorferi. Clinical Infectious Diseases 1997, 25: s9-s17. PMID: 9233658, DOI: 10.1086/516166.Peer-Reviewed Original ResearchConceptsImmune serumSyringe challengePassive protective activitySerum of miceArthritis resolutionHost-adapted spirochetesImmunocompetent miceJoint tissuesTissue transplantsProtective activityImmunodominant regionMiceSerumInfectionBorrelia burgdorferiB. burgdorferiRecombinant formBurgdorferiSpirochetesTissueChallenge inoculationCarditisTransplantSpirochetemiaAntigenTemporal pattern of Borrelia burgdorferi p21 expression in ticks and the mammalian host.
Das S, Barthold SW, Giles SS, Montgomery RR, Telford SR, Fikrig E. Temporal pattern of Borrelia burgdorferi p21 expression in ticks and the mammalian host. Journal Of Clinical Investigation 1997, 99: 987-995. PMID: 9062357, PMCID: PMC507907, DOI: 10.1172/jci119264.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsAntibodies, BacterialAntigens, BacterialAntigens, SurfaceArthritis, InfectiousBacterial Outer Membrane ProteinsBacterial ProteinsBacterial VaccinesBorrelia burgdorferi GroupElectrophoresis, Gel, Pulsed-FieldEnzyme-Linked Immunosorbent AssayFemaleFlagellinFluorescent Antibody Technique, IndirectGene Expression Regulation, BacterialHumansImmunizationImmunization, PassiveImmunoblottingIxodesLipoproteinsLyme DiseaseMiceMice, Inbred C3HPlasmidsPolymerase Chain ReactionRecombinant ProteinsRNA, MessengerTime FactorsConceptsInfected miceHumoral responseLate-stage Lyme diseaseMarkers of infectionCourse of diseaseMurine Lyme borreliosisB. burgdorferiB. burgdorferi infectionHuman humoral responseIxodes dammini ticksBurgdorferi-infected miceLyme arthritisActive immunizationMammalian hostsPassive transferBurgdorferi infectionC3H miceMurine infectionDay 14P21 antibodyP21 expressionLyme borreliosisLyme diseaseMiceInfection
1993
Long-term study of cell-mediated responses to Borrelia burgdorferi in the laboratory mouse
de Souza MS, Smith AL, Beck DS, Terwilliger GA, Fikrig E, Barthold SW. Long-term study of cell-mediated responses to Borrelia burgdorferi in the laboratory mouse. Infection And Immunity 1993, 61: 1814-1822. PMID: 8478071, PMCID: PMC280770, DOI: 10.1128/iai.61.5.1814-1822.1993.Peer-Reviewed Original ResearchConceptsT cell responsesDelayed-type hypersensitivity responseVigorous T cell responseRecipient C3H miceCell-mediated responsesAntigen-specific proliferationBorrelia burgdorferi infectionB cell mitogensAntigen-specific assaysLaboratory miceAdoptive transferImmune dysfunctionHypersensitivity responseResistant miceLymphocyte proliferationLymphoid organsBurgdorferi infectionC3H miceInterleukin-2Prostaglandin productionB cellsDiminished numberLyme borreliosisImpaired proliferationLong-term studies
1987
Epidemiology of American Cutaneous Leishmaniasis Due to Leishmania braziliensis brasiliensis
Jones T, Johnson W, Barretto A, Lago E, Badaro R, Cerf B, Reed S, Netto E, Tada M, Franca F, Wiese K, Golightly L, Fikrig E, Costa J, Cuba C, Marsden P. Epidemiology of American Cutaneous Leishmaniasis Due to Leishmania braziliensis brasiliensis. The Journal Of Infectious Diseases 1987, 156: 73-83. PMID: 3598227, DOI: 10.1093/infdis/156.1.73.Peer-Reviewed Original ResearchConceptsPrimary lesionMucosal diseaseCutaneous leishmaniasisFive-year prospective studyLeishmania braziliensis braziliensisYears of ageAmerican cutaneous leishmaniasisAntimony therapyAnnual incidenceSkin testingProspective studyRecent lesionsSkin testSkin lesionsEndemic areasPatientsLesionsDiseaseMost diseasesLeishmaniasisYearsTherapyEpidemiologyPrevalenceIncidence