Function of MVFR in Pseudomonas Aeruginosa Virulence
MVFR 在铜绿假单胞菌毒力中的作用
基本信息
- 批准号:8528902
- 负责人:
- 金额:$ 47.5万
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:2012
- 资助国家:美国
- 起止时间:2012-08-21 至 2015-07-31
- 项目状态:已结题
- 来源:
- 关键词:AcuteAnimal ModelAnimalsAnthranilic AcidsAnti-Infective AgentsAntibiotic ResistanceAntibioticsAttenuatedBacteriaBacterial InfectionsBenzamidesBenzimidazolesBindingBiochemicalBurn injuryBypassCellsChemicalsChronicCommunicationDNADNA BindingDataDevelopmentEmerging Communicable DiseasesFeedbackFigs - dietaryFundingGenerationsGenesGlossaryGoalsGram-Negative BacteriaGrowthHealthHospitalsHumanIncidenceInfectionIntensive Care UnitsLaboratoriesLeadLigand BindingLigandsLiquid ChromatographyMagnetic Resonance ImagingMammalsMediatingMetabolismMicrobeModelingMolecular GeneticsMolecular TargetMolecular WeightMulti-Drug ResistanceMusOperonOxidesPathogenesisPathway interactionsPlayPopulationPopulation DensityProcessProductionPropertyProtein RegionPseudomonas aeruginosaPublic HealthRefractoryRegulationRegulonRelapseResearchResistanceRoleSignal PathwaySignal TransductionSpectrometryStructureStructure-Activity RelationshipSystemTestingTextTherapeuticVirulenceVirulence FactorsWorkabsorptionantimicrobialantimicrobial drugbenzimidazolebiodefensecombatcommensal microbesdensitydrug discoverygenetic analysishigh throughput screeningimprovedin vivoinhibitor/antagonistinnovationinsightintercellular communicationiron oxidekillingsliquid chromatography mass spectrometrymutantnovelnovel strategiespathogenpressurepreventpromoterpublic health relevancequorum sensingsmall moleculetranscription factor
项目摘要
DESCRIPTION (provided by applicant): New approaches to antimicrobial drug discovery are urgently needed to combat untreatable infections caused by antibiotic resistant or persistent, antibiotic tolerant, bacteria. The long-term goal of this proposal is to develop novel therapy options that may prevent or reduce the complications of human bacterial acute and chronic or relapsing infections, and that could serve as alternatives or adjuncts to antibiotics. To achieve a paradigm shift in antimicrobial therapy, we propose to develop inhibitors of bacterial signaling pathways that control bacterial virulence and antibiotic tolerance mechanisms. Population density-dependent signaling, generally referred to as quorum sensing (QS), is one such mechanism. QS regulates multiple aspects of virulence. It is important for the development of acute infections and as recently discovered for the formation of antibiotic-tolerant cell populations, a process underlying pathogen persistence in chronic infections. This renewal application will test the hypothesis that novel inhibitors of QS, previously identified by us, can lead to the development of highly potent compounds with anti-infective activity in vivo. We will test this hypothesis by employing Pseudomonas aeruginosa, a recalcitrant Gram-negative bacterium that defies eradication by antibiotics and exemplifies current problematic pathogens in hospitals and intensive care units. In the last funding cycle, we demonstrated that P. aeruginosa pathogenesis can be disrupted in vivo by pharmacologically interfering with the multiple virulence factor regulator (MvfR) regulon, a component of QS circuitry that controls virulence and, as we recently discovered, the formation of antibiotic tolerant cells. We elucidated the mechanism of MvfR regulon activation and identified several small chemical compounds that inhibit the MvfR transcription factor and/or interfere with MvfR regulon activity in vivo. Using these chemical compounds, we will test our hypothesis through three Specific Aims: 1) To study the mechanisms of action of the candidate compounds using biochemical, mass spectrometric, and molecular genetic analyses. 2) To improve the most potent QS inhibitors through structure-activity relationship (SAR) studies. 3) To validate the in vivo efficacy of SAR-improved inhibitors in attenuating P. aeruginosa infection in suitable animal models. QS signaling circuits are evolutionarily conserved and play central roles in modulating virulence mechanisms in many different human pathogens. Therefore, by selectively interfering with QS, our data should yield paradigmatic insights that will be generally relevant for the development of new classes of anti-infectives that could limit development of multi-drug resistance and antibiotic tolerance in bacterial pathogens, while preserving beneficial commensal bacteria. Moreover, the study and inhibition of mechanisms involved in antibiotic tolerance could have a major impact on elucidating this unresolved phenomenon, as well as enabling the discovery of the first probe compounds targeted against antibiotic tolerant cells.
描述(由申请人提供):迫切需要抗菌药物发现的新方法,以对抗由抗生素耐药或持久性抗生素耐药细菌引起的无法治疗的感染。这项提议的长期目标是开发新的治疗方案,以预防或减少人类细菌急性、慢性或复发性感染的并发症,并可作为抗生素的替代品或辅助手段。为了实现抗菌治疗的范式转变,我们建议开发控制细菌毒力和抗生素耐受性机制的细菌信号通路抑制剂。种群密度相关的信号,通常被称为群体感应(QS),就是这样一种机制。QS调节多个方面的毒力。它对急性感染的发展和最近发现的抗生素耐受细胞群的形成很重要,这是慢性感染中病原体持续存在的一个过程。这一更新申请将验证我们之前发现的新型QS抑制剂可以导致体内抗感染活性的高效化合物的开发的假设。我们将采用铜绿假单胞菌来检验这一假设,铜绿假单胞菌是一种顽固性革兰氏阴性细菌,无法被抗生素根除,是目前医院和重症监护病房中存在问题的病原体的典型。在上一个资助周期中,我们证明了铜绿假单胞菌的发病机制可以通过药物干扰多毒力因子调节(MvfR)调控而在体内被破坏,MvfR是QS电路的一个组成部分,控制毒力,正如我们最近发现的那样,抗生素耐受细胞的形成。我们阐明了MvfR调控子激活的机制,并在体内鉴定了几种抑制MvfR转录因子和/或干扰MvfR调控子活性的小化合物。使用这些化合物,我们将通过三个具体目标来验证我们的假设:1)使用生化,质谱和分子遗传学分析来研究候选化合物的作用机制。2)通过构效关系(SAR)研究,改进最有效的QS抑制剂。3)在合适的动物模型上验证sar改良抑制剂减毒铜绿假单胞菌感染的体内效果。QS信号通路是进化保守的,在许多不同的人类病原体的毒力机制调节中发挥核心作用。因此,通过选择性地干扰QS,我们的数据应该产生典型的见解,这将与开发新型抗感染药物普遍相关,这些抗感染药物可以限制细菌病原体中多药耐药和抗生素耐受性的发展,同时保留有益的共生细菌。此外,抗生素耐受机制的研究和抑制可能对阐明这一尚未解决的现象产生重大影响,并使发现针对抗生素耐受细胞的第一个探针化合物成为可能。
项目成果
期刊论文数量(15)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(1)
A quorum sensing small volatile molecule promotes antibiotic tolerance in bacteria.
群体感应小挥发性分子可促进细菌的抗生素耐受性。
- DOI:10.1371/journal.pone.0080140
- 发表时间:2013
- 期刊:
- 影响因子:3.7
- 作者:Que,Yok-Ai;Hazan,Ronen;Strobel,Benjamin;Maura,Damien;He,Jianxin;Kesarwani,Meenu;Panopoulos,Panagiotis;Tsurumi,Amy;Giddey,Marlyse;Wilhelmy,Julie;Mindrinos,MichaelN;Rahme,LaurenceG
- 通讯作者:Rahme,LaurenceG
Considerations and caveats in anti-virulence drug development.
- DOI:10.1016/j.mib.2016.06.001
- 发表时间:2016-10
- 期刊:
- 影响因子:5.4
- 作者:Maura D;Ballok AE;Rahme LG
- 通讯作者:Rahme LG
A method for high throughput determination of viable bacteria cell counts in 96-well plates.
高吞吐量测定96孔板中可行细菌计数的一种方法。
- DOI:10.1186/1471-2180-12-259
- 发表时间:2012-11-13
- 期刊:
- 影响因子:4.2
- 作者:Hazan R;Que YA;Maura D;Rahme LG
- 通讯作者:Rahme LG
Molecular Insights into Function and Competitive Inhibition of Pseudomonas aeruginosa Multiple Virulence Factor Regulator.
- DOI:10.1128/mbio.02158-17
- 发表时间:2018-01-16
- 期刊:
- 影响因子:6.4
- 作者:Kitao T;Lepine F;Babloudi S;Walte F;Steinbacher S;Maskos K;Blaesse M;Negri M;Pucci M;Zahler B;Felici A;Rahme LG
- 通讯作者:Rahme LG
Assessing Pseudomonas aeruginosa Persister/antibiotic tolerant cells.
- DOI:10.1007/978-1-4939-0473-0_54
- 发表时间:2014
- 期刊:
- 影响因子:0
- 作者:Hazan R;Maura D;Que YA;Rahme LG
- 通讯作者:Rahme LG
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LAURENCE G RAHME其他文献
LAURENCE G RAHME的其他文献
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{{ truncateString('LAURENCE G RAHME', 18)}}的其他基金
A comprehensive investigation of Pseudomonas quorum sensing regulatory relationships and the consequences on quorum sensing inhibitors in complex communities
复杂群落中假单胞菌群体感应调控关系及其对群体感应抑制剂影响的全面研究
- 批准号:
10716869 - 财政年份:2023
- 资助金额:
$ 47.5万 - 项目类别:
Predictive Approaches and Technology Development for Identification of Susceptibility to Multiple Independent Infections in Trauma Patients
识别创伤患者多重独立感染易感性的预测方法和技术开发
- 批准号:
10455798 - 财政年份:2021
- 资助金额:
$ 47.5万 - 项目类别:
Molecular and Metabolic inter-kingdom actions of a bacterial quorum sensing signal in promotion of host tolerance/resilience.
细菌群体感应信号在促进宿主耐受性/弹性方面的分子和代谢界间作用。
- 批准号:
10080028 - 财政年份:2018
- 资助金额:
$ 47.5万 - 项目类别:
Molecular and Metabolic inter-kingdom actions of a bacterial quorum sensing signal in promotion of host tolerance/resilience.
细菌群体感应信号在促进宿主耐受性/弹性方面的分子和代谢界间作用。
- 批准号:
10326383 - 财政年份:2018
- 资助金额:
$ 47.5万 - 项目类别:
Interruption of Signaling-Mediated Bacterial Persistent Infections
中断信号介导的细菌持续感染
- 批准号:
8510253 - 财政年份:2013
- 资助金额:
$ 47.5万 - 项目类别:
Interruption of Signaling-Mediated Bacterial Persistent Infections
中断信号介导的细菌持续感染
- 批准号:
9033070 - 财政年份:2013
- 资助金额:
$ 47.5万 - 项目类别:
Interruption of Signaling-Mediated Bacterial Persistent Infections
中断信号介导的细菌持续感染
- 批准号:
8627544 - 财政年份:2013
- 资助金额:
$ 47.5万 - 项目类别:
Interruption of Signaling-Mediated Bacterial Persistent Infections
中断信号介导的细菌持续感染
- 批准号:
9247131 - 财政年份:2013
- 资助金额:
$ 47.5万 - 项目类别:
Function of MVFR in Pseudomonas aeruginosa virulence
MVFR 在铜绿假单胞菌毒力中的作用
- 批准号:
7613448 - 财政年份:2006
- 资助金额:
$ 47.5万 - 项目类别:
Function of MVFR in Pseudomonas aeruginosa virulence
MVFR 在铜绿假单胞菌毒力中的作用
- 批准号:
7796681 - 财政年份:2006
- 资助金额:
$ 47.5万 - 项目类别:
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