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Drosophila melanogaster as a model host for Vibrio cholerae

Drosophila melanogaster as a model host for Vibrio cholerae
黑腹果蝇作为霍乱弧菌的模型宿主
批准号：
7429665
负责人：
PAULA I WATNICK
金额：
$41.45万
依托单位：
BOSTON CHILDREN'S HOSPITAL
依托单位国家：
美国
项目类别：
财政年份：
2007
资助国家：
美国
项目状态：
已结题
起止时间：
2007-06-01 至 2011-05-31
来源：
https://reporter.nih.gov/project-details/7429665
关键词：
Adenylate CyclaseApoptosisApoptoticArthropod VectorsArthropodsAttenuatedAttenuated Live Virus VaccineBacteriaBacterial ToxinsBiologyCalcium-Activated Potassium ChannelCessation of lifeCholeraCholera ToxinCholera VaccineDevelopmentDiarrheaDiseaseDrosophila genusDrosophila melanogasterEmerging Communicable DiseasesEnvironmentEnzymesEpidemicEpithelial CellsEpitheliumFecesFutureGastrointestinal tract structureGenesGenetic ScreeningGenetic TranscriptionGenetic screening methodGenomeGlycosphingolipidsHomologous GeneHumanImmuneImmune responseImmune systemInfectionInflammatoryIngestionInsectaIntegration Host FactorsIntestinesLifeLightMammalian CellMediatingModelingMorbidity - disease rateNatural ImmunityNumbersOrganismPeptide SynthesisPersonal SatisfactionPhagocytosisPhenotypePhosphorusPlayPotassium ChannelPredispositionProductionProteinsReactive Oxygen SpeciesReportingResearch PersonnelResistanceRoleSignal PathwayStudy modelsTestingVibrio choleraeVirulence FactorsVirus DiseasesWorkantimicrobial peptidebasebiodefensecaspase-8flyhalophilic bacteriaimprovedmutantnovel therapeuticspathogenprogramsresearch studyresponsevector

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DESCRIPTION (provided by applicant): Vibrio cholerae, a gram-negative halophilic bacterium found in aquatic environments is the causative agent of the epidemic and deadly diarrheal disease cholera. We have previously shown that ingestion of pathogenic strains of V. cholerae by Drosophila melanogaster results in lethal infection. This infection is dependent on cholera toxin expression by the bacterium as well as on the presence of wild-type levels of adenylyl cyclase, Gsa, and Ca2+-activated K+ channels in the fly. These findings support the conclusion that cholera toxin is the primary virulence factor in both human and Drosophila infection and acts by a similar mechanism in both of these organisms. Based on these results, we hypothesize that the fly may be a useful and practical model host in which to identify host factors that impact the course of V. cholerae infection. To this end, we have initiated a forward genetic screen to identify Drosophila mutants whose susceptibility ty. These experiments will lay the ground work for future studies using the fly as a model to identify novel therapeutics for cholera, modulators of the immune response to V. cholerae, and factors that influence the susceptibility of the mammalian host to V. cholerae infection. We propose to complete the following specific aims: Specific Aim 1: Completion of a genetic screen to identify host proteins that impact the susceptibility of Drosophila melanogaster to V. cholerae infection. Specific Aim 2: To establish intestinal apoptosis as a factor in the susceptibility of Drosophila to V. cholerae infection and to identify the Drosophila signaling pathways that modulate intestinal apoptosis. Specific Aim 3: To identify Vibrio cholerae factors those are responsible for stimulation of the apoptotic response.
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