2024
Dual roles for a tick protein disulfide isomerase during the life cycle of the Lyme disease agent.
Tang X, Cui Y, Namarra U, Tian X, Rivas-Giorgi F, Fikrig E. Dual roles for a tick protein disulfide isomerase during the life cycle of the Lyme disease agent. MBio 2024, e0175424. PMID: 39470213, DOI: 10.1128/mbio.01754-24.Peer-Reviewed Original ResearchProtein disulfide isomeraseLyme disease agentDisulfide isomeraseBlood-feeding vectorsExtracellular pathogensGene expressionInvasion of host cellsThiol-disulfide oxidoreductasesDisease agentsGroup of enzymesStages of bacterial infectionVirulence factorsLife cycleChaperone activityMammalian hostsHost cellsBlood-feeding ticksIsomeraseMicrobial infectionsColonized ticksPathogensDiverse infectionsMicrobial invasionInfection of miceVector-borne diseases
2020
The Effects of A Mosquito Salivary Protein on Sporozoite Traversal of Host Cells
Chuang YM, Agunbiade TA, Tang XD, Freudzon M, Almeras L, Fikrig E. The Effects of A Mosquito Salivary Protein on Sporozoite Traversal of Host Cells. The Journal Of Infectious Diseases 2020, 224: 544-553. PMID: 33306099, PMCID: PMC8328219, DOI: 10.1093/infdis/jiaa759.Peer-Reviewed Original ResearchConceptsPassive immunizationCell traversal activityMosquito saliva proteinsMosquito salivary proteinsMosquito salivaNeutrophil chemotaxisProtein monoclonal antibodyProtective effectSporozoite glidingSporozoite infectivitySporozoite traversalMonoclonal antibodiesHost skinAnopheles mosquitoesProtein 1ImmunizationBlood mealSporozoitesSalivaMiceHost cellsSaliva proteinsSalivary proteinsAntiserumVertebrate hosts
2014
Anaplasma phagocytophilum surface protein AipA mediates invasion of mammalian host cells
Seidman D, Ojogun N, Walker NJ, Mastronunzio J, Kahlon A, Hebert KS, Karandashova S, Miller DP, Tegels BK, Marconi RT, Fikrig E, Borjesson DL, Carlyon JA. Anaplasma phagocytophilum surface protein AipA mediates invasion of mammalian host cells. Cellular Microbiology 2014, 16: 1133-1145. PMID: 24612118, PMCID: PMC4115035, DOI: 10.1111/cmi.12286.Peer-Reviewed Original ResearchConceptsGranulocytic anaplasmosisObligate intracellular bacteriumVivo infectionInfectionPhagocytophilum infectionTransmission feedingObligate intracellular pathogensInfected ticksIntracellular pathogensNon-phagocytic cellsIntracellular bacteriumHL-60 cellsHost cell invasionCell invasionAnaplasma phagocytophilumPeptide-specific antiserumOwn uptakeHost cellsAttractive targetInternalization stepMammalian cellsInvasion proteinsSurface proteinsCell morphotypesCells
2012
Anaplasma phagocytophilum Asp14 Is an Invasin That Interacts with Mammalian Host Cells via Its C Terminus To Facilitate Infection
Kahlon A, Ojogun N, Ragland SA, Seidman D, Troese MJ, Ottens AK, Mastronunzio JE, Truchan HK, Walker NJ, Borjesson DL, Fikrig E, Carlyon JA. Anaplasma phagocytophilum Asp14 Is an Invasin That Interacts with Mammalian Host Cells via Its C Terminus To Facilitate Infection. Infection And Immunity 2012, 81: 65-79. PMID: 23071137, PMCID: PMC3536139, DOI: 10.1128/iai.00932-12.Peer-Reviewed Original ResearchMeSH KeywordsAmino Acid SequenceAnaplasma phagocytophilumAnimalsBacterial Outer Membrane ProteinsBinding SitesCell AdhesionCell Line, TumorEhrlichiaEhrlichiosisGene Expression Regulation, BacterialGlutathione TransferaseHL-60 CellsHumansMembrane GlycoproteinsMembrane ProteinsMiceMolecular Sequence DataProtein BindingProtein Structure, TertiaryProteomeSequence Analysis, ProteinTranscription, GeneticUp-RegulationConceptsMammalian host cellsHost cellsReticulate cellsOuter membrane protein candidatesSurface proteinsOuter membrane protein AMembrane protein AA. phagocytophilum-infected ticksObligate intracellular bacteriumA. phagocytophilumGlutathione S-transferaseTranscriptional profilingSurface proteomeC-terminusAffinity purificationFamily AnaplasmataceaeProtein candidatesSelective biotinylationCellular invasionAsp14Transmission feedingAmino acidsS-transferaseIntracellular bacteriumP-selectin glycoprotein ligand-1Anaplasma phagocytophilum Outer Membrane Protein A Interacts with Sialylated Glycoproteins To Promote Infection of Mammalian Host Cells
Ojogun N, Kahlon A, Ragland SA, Troese MJ, Mastronunzio JE, Walker NJ, VieBrock L, Thomas RJ, Borjesson DL, Fikrig E, Carlyon JA. Anaplasma phagocytophilum Outer Membrane Protein A Interacts with Sialylated Glycoproteins To Promote Infection of Mammalian Host Cells. Infection And Immunity 2012, 80: 3748-3760. PMID: 22907813, PMCID: PMC3486060, DOI: 10.1128/iai.00654-12.Peer-Reviewed Original ResearchConceptsMammalian host cellsHuman granulocytic anaplasmosisHost cellsHL-60 cellsA. phagocytophilum organismsExtracellular domainP-selectin glycoprotein-1Outer Membrane Protein ASialylated glycoproteinsA. phagocytophilum infectionA. phagocytophilum-infected ticksN-terminal regionMembrane protein AObligate intracellular bacteriumAmino acids 19HGA patientsPhagocytophilum infectionInfectionTransmission feedingGlutathione S-transferaseGranulocytic anaplasmosisIntracellular bacteriumGlycoprotein 1Anaplasma phagocytophilumA. phagocytophilum
2006
Mechanisms of evasion of neutrophil killing by Anaplasma phagocytophilum
Carlyon JA, Fikrig E. Mechanisms of evasion of neutrophil killing by Anaplasma phagocytophilum. Current Opinion In Hematology 2006, 13: 28-33. PMID: 16319684, DOI: 10.1097/01.moh.0000190109.00532.56.Peer-Reviewed Original ResearchConceptsApoptosis differentiation programMitochondrial membrane integrityA. phagocytophilumCaspase-3 activationBacterium altersMolecular machineryVacuolar membraneTranscription factorsDifferentiation programMammalian hostsSecretory vesiclesAnaplasma phagocytophilumCytoplasmic compartmentGene expressionPromoter activityAntiapoptotic genesNADPH oxidase assemblyOxidase assemblyNeutrophil gene expressionHost cellsBacterial uptakeNADPH oxidase componentsMechanisms of evasionMembrane integrityCytochrome b558
2005
Early Transcriptional Response of Human Neutrophils to Anaplasma phagocytophilum Infection
Sukumaran B, Carlyon JA, Cai JL, Berliner N, Fikrig E. Early Transcriptional Response of Human Neutrophils to Anaplasma phagocytophilum Infection. Infection And Immunity 2005, 73: 8089-8099. PMID: 16299303, PMCID: PMC1307096, DOI: 10.1128/iai.73.12.8089-8099.2005.Peer-Reviewed Original ResearchConceptsEarly transcriptional responseTranscriptional responseGene expressionHost cell gene expressionComprehensive DNA microarray analysisA. phagocytophilum infectionDNA microarray analysisObligate intracellular pathogensCell gene expressionCFLAR geneTNFSF10 geneA. phagocytophilum-infected neutrophilsCytoskeletal remodelingVesicular transportTranscriptional profilesHost pathwaysMicroarray analysisAntiapoptotic genesPromyelocytic cell lineDifferential expressionPhagocytophilum infectionHost cellsGenesHuman neutrophilsIntracellular pathogens
2003
Invasion and survival strategies of Anaplasma phagocytophilum
Carlyon JA, Fikrig E. Invasion and survival strategies of Anaplasma phagocytophilum. Cellular Microbiology 2003, 5: 743-754. PMID: 14531890, DOI: 10.1046/j.1462-5822.2003.00323.x.Peer-Reviewed Original ResearchConceptsAnaplasma phagocytophilumA. phagocytophilumHuman granulocytic ehrlichiosisHostile intracellular environmentTick-borne zoonosisObligate intracellular bacteriumHost neutrophilsNeutrophil adhesionInnate immunityPolymorphonuclear leucocytesAetiological agentGranulocytic ehrlichiosisIntracellular bacteriumNeutrophilsMicrobicidal activityPhagocytophilumHost cellsProteolytic compoundsAcidic lysosomesBacteria-containing phagosomesKey playersLeucocytesImmunityEhrlichiosisPhagocytes
1998
The agent of Human Granulocytic Ehrlichiosis resides in an endosomal compartment.
Webster P, IJdo JW, Chicoine LM, Fikrig E. The agent of Human Granulocytic Ehrlichiosis resides in an endosomal compartment. Journal Of Clinical Investigation 1998, 101: 1932-1941. PMID: 9576758, PMCID: PMC508780, DOI: 10.1172/jci1544.Peer-Reviewed Original ResearchConceptsEndocytic pathwayLysosomal membrane glycoproteins lamp-1Membrane-bound compartmentsMannose-6-phosphate receptorInfected host cellsHL-60 cellsEndosomal compartmentsVacuole membraneLAMP-1Host cellsHGE bacteriaVacuolesTransferrin receptorColloidal gold particlesCompartmentsPathwayCytoplasmic vacuolesCellsAgent of HGEReceptorsOrganismsLow pHHuman granulocytic ehrlichiosisBacteriaHGE agent