6533b828fe1ef96bd1288fef
RESEARCH PRODUCT
Different behavior of myeloperoxidase in two rodent amoebic liver abscess models.
Andrea Cruz-baqueroVíctor Rivera-aguilarRosa Adriana Jarillo-lunaManuel Gutiérrez-mezaJudith Pacheco-yépezÁNgel Miliar-garcíaLuz María Cárdenas JaramilloRafael Campos-rodríguezsubject
0301 basic medicineMalePathologyNeutrophilslcsh:MedicineGene ExpressionPathology and Laboratory MedicineWhite Blood Cells0302 clinical medicineAnimal CellsCricetinaeMedicine and Health SciencesAmoebaslcsh:ScienceImmune ResponseDisease ResistanceMammalsProtozoansMice Inbred BALB CMultidisciplinaryAmoebic liver abscessbiologyChemistryAnimal ModelsLiverExperimental Organism SystemsMyeloperoxidaseHost-Pathogen InteractionsVertebratesLiver Abscess AmebicHamstersmedicine.symptomCellular TypesResearch Articlemedicine.medical_specialtyImmune CellsImmunologyMouse ModelsResearch and Analysis MethodsRodentsMicrobiologyLesionEntamoeba Histolytica03 medical and health sciencesEntamoeba histolyticaModel OrganismsSigns and SymptomsIn vivoDiagnostic MedicineParasite GroupsmedicineGeneticsAnimalsAmoebiasisTrophozoitesPeroxidaseInflammationBlood Cellslcsh:ROrganismsBiology and Life SciencesCell Biologybiology.organism_classificationmedicine.diseaseIn vitroParasitic ProtozoansDisease Models Animal030104 developmental biologyAmniotesbiology.proteinlcsh:QParasitologyLeukocyte ElastaseApicomplexa030215 immunologyLiver abscessdescription
The protozoan Entamoeba histolytica is the etiological agent of amoebiasis, which can spread to the liver and form amoebic liver abscesses. Histological studies conducted with resistant and susceptible models of amoebic liver abscesses (ALAs) have established that neutrophils are the first cells to contact invasive amoebae at the lesion site. Myeloperoxidase is the most abundant enzyme secreted by neutrophils. It uses hydrogen peroxide secreted by the same cells to oxidize chloride ions and produce hypochlorous acid, which is the most efficient microbicidal system of neutrophils. In a previous report, our group demonstrated that myeloperoxidase presents amoebicidal activity in vitro. The aim of the current contribution was to analyze in vivo the role of myeloperoxidase in a susceptible (hamsters) and resistant (Balb/c mice) animal models of ALAs. In liver samples of hamsters and mice inoculated intraportally with Entamoeba histolytica trophozoites, the number of neutrophils in ALAs was determined by enzymatic activity. The presence of myeloperoxidase was observed by staining, and its expression and activity were quantified in situ. A significant difference existed between the two animal models in the number of neutrophils and the expression and activity of myeloperoxidase, which may explain the distinct evolution of amoebic liver abscesses. Hamsters and mice were treated with an MPO inhibitor (4-aminobenzoic acid hydrazide). Hamsters treated with ABAH showed no significant differences in the percentage of lesions or in the percentage of amoebae damaged compared with the untreated hamsters. ABAH treated mice versus untreated mice showed larger abscesses and a decreased percentage of damaged amoebae in these lesion at all stages of evolution. Further studies are needed to elucidate the host and amoebic mechanisms involved in the adequate or inadequate activation and modulation of myeloperoxidase.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-09-12 | PloS one |