The immunomodulatory role of Ankyrin repeat containing effectors expressed by Coxiella burnetii
The immunomodulatory role of Ankyrin repeat containing effectors expressed by Coxiella burnetii
批准号:
9815034
负责人:
JAMES Evans SAMUEL
金额:
$22.44万
依托单位国家:
美国
项目类别:
财政年份:
2019
资助国家:
美国
项目状态:
已结题
起止时间:
2019-06-20 至 2021-05-31
关键词:
AgonistAmino AcidsAnkyrin RepeatAttenuatedBacteriaBindingBiological AssayBone MarrowC57BL/6 MouseC57BL/6N MouseCD14 geneCell LineCell NucleusCellsChIP-seqComplementCoxiella burnetiiDataDiseaseEctopic ExpressionEpitopesGene ExpressionGeneticGenetic TranscriptionGoalsGrowthHela CellsImmune EvasionImpairmentIn VitroIndividualInfectionInflammatory ResponseInhalationInnate Immune ResponseKineticsLeadMapsMediatingModelingMolecularNuclearNuclear TranslocationPathogenicityPathway interactionsPhenotypePhosphorylationProcessProtein BiosynthesisProteinsPublishingQ FeverRNA InterferenceRoleSCID MiceSignal PathwaySignal TransductionSystemTNF geneTestingVirulenceVirulence FactorsVirulentZoonosesbaseexperimental studygenetic predictorsimmunoregulationin vivoinhibitor/antagonistknock-downknockout genemacrophagemonocytemutantp65pathogenpathogenic bacteriaresponsesingle-cell RNA sequencingtissue/cell culturetooltranscription factor
中文摘要
白纹伊蚊可引起人畜共患热病,主要存在于单核细胞/巨噬细胞内。
操纵其先天免疫反应。白纹伊蚊需要从头开始合成蛋白质和蛋白质。
功能性转录因子IVB分泌调控系统(T4BSS)调节真核生物转录。
核因子-κB因子(NF-κB)是天然免疫反应的关键监管机构。
包括沙门氏菌在内的病原体可以传递含有Ank的真核型抗体效应器,从而劫持了NF-κB。
信令。C、C、B、C、C、G、A、C、F、A、G、C、A、C、C、A、C、B、C、F、G、G、C、A、C、C、F、G、G、C、A、C、F、G、T、C、F、G、T、C、N、C、F、G、T、G、D、C、F、G
-K)。实验发现:1)AnkK和AnkC显著促进了C.
抑制核因子-κB依赖的蛋白基因的表达,以及(2)血管紧张素转换酶基因或血管紧张素转换酶基因的异位表达。
HEK293/hTLR4-MD2-CD14+细胞可阻断核内核因子-κB的积聚。这是主要的研究焦点。
在这项新的提案中,预计将从机械上确定C.Kburnetii的两个效应器,即AnkK和AnkC,如何发挥作用。
调节核因子-κB,以进一步促进细胞内信号的存活和复制。
完成以下具体目标:1.确定安卡拉和安卡拉对中国的贡献比例。
卡氏杆菌的毒力。最有效的假说是卡氏杆菌、AnkK和AnkC促进了这种病毒的产生。
病原菌通过调节核因子-κB的激活来增强毒力。为了测试这一点,我们预计不会产生这种病毒。
白纹伊蚊和南美白纹伊蚊(NM II)菌株K::TN和突变体C::TN的互补作用
研究其在组织中的表型及p65核转位基因的表达。
细胞培养。为了更好地研究体内生长和救援,我们将继续采用SCID小鼠/新城疫II病毒感染。
模型。在使用CyA易位检测之后,我们将测试T4型细胞分泌系统。
要求。此外,我们还将生成ΔDOTA、ΔAnkK、ΔAnkC和AnkC基因敲除以及它们的基因敲除。
在强毒白纹伊蚊(NM I)中补充毒株,以感染C57BL/6N小鼠,并确定。
AnkK基因和AnkC基因在体内对细菌毒力的相对贡献率。
在白纹伊蚊感染过程中,依赖于AnkK/AnkC的κB的抑制机制。
该假说的工作原理是,在最具典范的Nf-κB中,AnkC与东道主和目标进行互动。
P65的途径是或潜在地消耗P65,以阻止其主要的核转位。我们将不会消耗P65。
宿主细胞需要调查KNM II基因K::TN和KNKC::TN突变体的生长和救援能力。我们将继续检查。
基因的表达、磷酸化和降解以及它们各自组成成分的状态。
NF-κB途径在稳定表达EGFP标记的AnkK和AnkC的THP-1细胞系中被发现。
宿主结合蛋白合作伙伴(S),将继续与稳定的THP-1细胞一起进行下拉检测(gfp-teltrap)。
表达绿色荧光蛋白-AnkK基因和基因-AnkC基因的目的是为了确定C-AnkC基因或AnkC基因是否驱动了基因的调制。
宿主对p65依赖的基因在感染细胞中的表达,我们将不再进行scRNA-seq和p65/芯片的检测。
SEQ是一种实验。
英文摘要
C. burnetii causes the zoonotic disease Q fever and resides within monocytes/macrophages
manipulating innate immune response. C. burnetii requires de novo protein synthesis and a
functional Type IVB Secretion System (T4BSS) to modulate host the eukaryotic transcription
factor Nuclear Factor-κB (NF-κB) signaling an essential regulator of innate response. Multiple
pathogens including C. burnetii deliver eukaryotic-type Ank-containing effectors to hijack NF-κB
signaling. C. burnetii Nine Mile isolate encodes 5 Ank-containing effectors (AnkA, -C, -F, -G, and
-K). Experiments found that 1) AnkK and AnkC significantly contributes to C. burnetii’s ability to
inhibit NF-κB dependent gene expression and 2) ectopic expression of AnkK or AnkC in
HEK293/hTLR4-MD2-CD14 cells blocks accumulation of NF-κB in the nucleus. The central focus
of this proposal is to determine mechanistically how the C. burnetii effectors, AnkK and AnkC,
modulate NF-κB to promote intracellular survival and replication. The central hypothesis by
accomplishing the following specific aims: 1. Determine the contribution of AnkK and -C to
C. burnetii’s virulence. The working hypothesis is that C. burnetii AnkK and AnkC promotes
pathogen virulence by modulating NF-κB activation. To test this, we will generate
complementation strains of C. burnetii NM II (NM II) ankK::Tn and ankC::Tn mutants and
investigate in vitro growth rescue and p65 nuclear translocation for phenotype rescue in tissue
culture cells. To investigate in vivo growth rescue, we will employ the SCID mice/NM II infection
model. Employing CYA-translocation assays, we will then test Type 4 secretion system
requirement. Furthermore, we will generate ΔdotA, ΔAnkK, and ΔAnkC gene knockouts and their
complementation strains in virulent C. burnetii NM I (NM I) to infect C57Bl/6N mice and determine
the relative contribution of AnkK and AnkC to bacterial virulence in vivo. 2. Determine the
mechanism of AnkK/AnkC-dependent NF-κB inhibition during C. burnetii infection. The
working hypothesis is C. burnetii AnkK or AnkC interacts with host targets in the canonical NF-κB
pathway or potentially sequesters p65 to block its nuclear translocation. We will deplete p65 in
host cells to investigate growth rescue of NM II ankK::Tn and ankC::Tn mutants. We will examine
expression, phosphorylation and degradation status of individual components of the canonical
NF-κB pathway in stable THP-1 cell lines expressing eGFP-tagged AnkK and AnkC. To identify
host-binding partner(s), pull down assays (GFP-trap) will be performed with THP-1 stable cells
expressing eGFP-AnkK and –AnkC. To determine C. burnetii AnkK or AnkC driven modulation of
host p65-dependent gene expression in infected cells, we will perform scRNA-seq and p65/ChIP-
seq experiments.
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