Altered hyaluronan deposition by bronchial epithelial cells contributes to inflammation during respiratory syncytial virus infection
支气管上皮细胞改变的透明质酸沉积导致呼吸道合胞病毒感染期间的炎症
基本信息
- 批准号:10612065
- 负责人:
- 金额:$ 9.43万
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:2022
- 资助国家:美国
- 起止时间:2022-05-01 至 2024-04-30
- 项目状态:已结题
- 来源:
- 关键词:AcuteAdhesionsAdhesivesAlveolusAttenuatedBindingBiological AssayBiological ModelsCell Culture TechniquesCell LineCellsChildChildhoodCoculture TechniquesDataDepositionEpithelial CellsExtracellular MatrixFibroblastsFutureGenesHospitalizationHumanHyaluronanImmuneImmune responseInfectionInflammationInflammation MediatorsInflammatoryInflammatory ResponseKnowledgeLaboratoriesLeukocytesLower Respiratory Tract InfectionLungMediatingModelingModificationMolecularMorbidity - disease rateMucous body substanceNeutrophil ActivationObstructionOligonucleotidesPathologicPlayPositioning AttributeProductionProteinsPulmonary InflammationReportingRespiratory DiseaseRespiratory Syncytial Virus InfectionsRespiratory TherapyRespiratory syncytial virusRoleShapesSiteSmall Interfering RNASourceStromal CellsStructure of parenchyma of lungSubmucosaSupportive careTNF geneTechniquesTestingTherapeutic InterventionUp-RegulationVaccinesViral PathogenesisViral Respiratory Tract InfectionVirus DiseasesWhite Blood Cell Count procedureWorkacute infectionairway inflammationairway obstructionbronchial epitheliumcell injuryexperimental studyin vivoinhibitorknock-downleukocyte activationmortalityneutrophilnew therapeutic targetnovelnovel therapeutic interventionnovel therapeuticspathogenic viruspharmacologicrecruitrespiratory virusresponse to injurysmall hairpin RNA
项目摘要
PROJECT SUMMARY / ABSTRACT
Lower respiratory tract infections commonly caused by respiratory syncytial virus (RSV) are a leading cause of
hospitalizations and mortality worldwide in young children. Despite many years of study, the mainstay of
treatment remains supportive care and currently no RSV specific treatment or vaccine is available. The cells
that line the airways, otherwise known as bronchial epithelial cells (BECs), are the primary target for RSV
infection. Infection of the BECs with RSV leads to subsequent BEC damage, obstruction of the lower airways
with cellular debris and mucous, and the establishment of airway inflammation by recruitment of immune cells
such as neutrophils into the peribronchial space. Recent studies from our laboratory have demonstrated that
RSV infection of stromal cells such as lung fibroblasts leads to the establishment of an extracellular matrix
(ECM) that is enriched with hyaluronan (HA) which promotes the accumulation and activation of leukocytes in
ex vivo cell culture models. Furthermore, we found that the increased HA accumulation following RSV infection
was more closely associated with the fibroblast cell layer and displayed greater modification with heavy chains
(HC) which has been described in other studies to enhance the ECM’s ability to become sticky for
inflammatory cells and promotes the inflammatory response in the lung. The formation of HC-HA is the result
of the enzymatic activity of tumor necrosis factor stimulated gene 6 (TSG-6), which is not normally expressed
in healthy lung tissue, but is induced in response to injury. In our previous work with lung fibroblasts, we have
shown that TSG-6 is upregulated during RSV infection and blocking its induction with siRNA decreased the
amount of HC-HA that was formed and decreased the accumulation of leukocytes. Despite being the primary
target of RSV infection, no studies exist that have evaluated the effects of RSV infection on BEC production of
HA or TSG-6 induced HC-HA formation despite the important role that HC-HA plays in promoting lung
inflammation. Our laboratory both has expertise in the characterization of HA matrices and access to primary
human BECs from well-characterized pediatric donors placing our group in a unique position to evaluate the
contribution of BEC derived HC-HA to the inflammatory response following RSV infection. We hypothesize that
RSV infection of BECs leads to increased production and accumulation of HA which will in turn promote the
accumulation and activation of neutrophils in an ex vivo human cell culture model system. Additionally, we will
test the hypothesis that RSV infection of BECs will induce the expression of TSG-6 thereby promoting the
formation of HC-HA and further drive the accumulation and activation of neutrophils in our model system. We
will pharmacologically block the formation of HC-HA enriched ECMs and also block the induction of TSG-6
during RSV infection in order to establish whether the increased accumulation of the neutrophils is HC-HA
dependent. If true, characterizing the importance of HC-HA produced by BECs may lead to novel targets for
therapeutic intervention during acute RSV infections and may be applicable to other respiratory viruses.
项目总结/摘要
通常由呼吸道合胞病毒(RSV)引起的下呼吸道感染是呼吸道感染的主要原因。
住院率和死亡率。尽管经过多年的研究,
治疗仍然是支持性护理,目前没有RSV特异性治疗或疫苗可用。细胞
气管上皮细胞(BEC)是RSV的主要靶细胞
感染RSV感染BEC导致随后的BEC损伤,下呼吸道阻塞
与细胞碎片和粘液,并通过募集免疫细胞建立气道炎症
如中性粒细胞进入支气管周围空间。我们实验室最近的研究表明,
RSV感染基质细胞如肺成纤维细胞导致细胞外基质的建立
(ECM)富含透明质酸(HA),可促进白细胞的积累和激活,
离体细胞培养模型。此外,我们发现RSV感染后HA积累增加,
与成纤维细胞层更紧密相关,并显示出更大的重链修饰
(HC)这在其他研究中已经被描述为增强ECM的能力,
炎症细胞,并促进肺部的炎症反应。HC-HA的形成是
肿瘤坏死因子刺激基因6(TSG-6)的酶活性,该基因通常不表达
在健康的肺组织中,但在对损伤的反应中被诱导。在我们以前对肺成纤维细胞的研究中,
表明TSG-6在RSV感染期间上调,用siRNA阻断其诱导降低了TSG-6的表达。
HC-HA的形成量,并减少白细胞的积累。尽管是主要的
RSV感染的靶点,目前还没有研究评估RSV感染对BEC生产的影响,
HA或TSG-6诱导HC-HA形成,尽管HC-HA在促进肺功能方面起重要作用,
炎症我们的实验室在HA基质的表征方面具有专业知识,
来自特征良好的儿科供体的人BEC使我们的小组处于一个独特的位置,以评估
BEC衍生的HC-HA对RSV感染后炎症反应的贡献。我们假设
BEC的RSV感染导致HA的产生和积累增加,这反过来将促进BEC的生长。
在离体人细胞培养模型系统中的嗜中性粒细胞的积累和活化。此外,我们将
测试RSV感染BEC将诱导TSG-6表达从而促进BEC表达的假设。
在我们的模型系统中,HC-HA的形成和进一步驱动嗜中性粒细胞的积累和活化。我们
将阻断富含HC-HA的ECM的形成,并且还阻断TSG-6的诱导
为了确定嗜中性粒细胞的积累增加是否是HC-HA
依赖。如果这是真的,那么描述由BEC产生的HC-HA的重要性可能会导致新的靶点,
急性RSV感染期间的治疗干预,并可能适用于其他呼吸道病毒。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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STEPHEN R REEVES其他文献
STEPHEN R REEVES的其他文献
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{{ truncateString('STEPHEN R REEVES', 18)}}的其他基金
Altered hyaluronan deposition by bronchial epithelial cells contributes to inflammation during respiratory syncytial virus infection
支气管上皮细胞改变的透明质酸沉积导致呼吸道合胞病毒感染期间的炎症
- 批准号:
10418432 - 财政年份:2022
- 资助金额:
$ 9.43万 - 项目类别:
Airway epithelial regulation of fibroblast hyaluronan and versican production in asthmatic airway inflammation
哮喘气道炎症中成纤维细胞透明质酸和多功能蛋白聚糖产生的气道上皮调节
- 批准号:
9975887 - 财政年份:2017
- 资助金额:
$ 9.43万 - 项目类别:
Airway epithelial regulation of fibroblast hyaluronan and versican production in asthmatic airway inflammation
哮喘气道炎症中成纤维细胞透明质酸和多功能蛋白聚糖产生的气道上皮调节
- 批准号:
9385687 - 财政年份:2017
- 资助金额:
$ 9.43万 - 项目类别:
Airway epithelial regulation of fibroblast hyaluronan and versican production in asthmatic airway inflammation
哮喘气道炎症中成纤维细胞透明质酸和多功能蛋白聚糖产生的气道上皮调节
- 批准号:
10208933 - 财政年份:2017
- 资助金额:
$ 9.43万 - 项目类别:
Postnatal Intermittent Hypoxia and Respiration: Potenti*
产后间歇性缺氧和呼吸:电位*
- 批准号:
7077585 - 财政年份:2005
- 资助金额:
$ 9.43万 - 项目类别:
Postnatal Intermittent Hypoxia and Respiration: Potenti*
产后间歇性缺氧和呼吸:电位*
- 批准号:
7248678 - 财政年份:2005
- 资助金额:
$ 9.43万 - 项目类别:
Postnatal Intermittent Hypoxia and Respiration: Potenti*
产后间歇性缺氧和呼吸:电位*
- 批准号:
6883771 - 财政年份:2005
- 资助金额:
$ 9.43万 - 项目类别:
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