Mechanisms used by skin dendritic cells to induce regulatory T cells
皮肤树突状细胞诱导调节性 T 细胞的机制
基本信息
- 批准号:8892089
- 负责人:
- 金额:$ 24.9万
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:2014
- 资助国家:美国
- 起止时间:2014-07-15 至 2017-06-30
- 项目状态:已结题
- 来源:
- 关键词:Allergic DiseaseAntigen TargetingAntigen-Presenting CellsAntigensAppearanceAtopic DermatitisAwardCell physiologyCellsComprehensionContact DermatitisCutaneousData ReportingDendritic CellsDermalDevelopmentDietary FactorsDiseaseDominant-Negative MutationEnvironmental Risk FactorEvaluationEventFunctional disorderGenerationsGenetic EngineeringGenetic TranscriptionGoalsImmuneImmune responseImmune systemImmunologyIn SituIn VitroInflammationInflammatoryInflammatory ResponseIntestinesKnockout MiceKnowledgeLangerhans cellLeadLymphoid TissueMediatingMentorsMicroarray AnalysisModelingMolecularMolecular BiologyMonoclonal AntibodiesMusPathologyPemphigus VulgarisPhasePhenotypePlayPopulationPositioning AttributePsoriasisRegulatory T-LymphocyteRelative (related person)ReportingResearchRetinoic Acid ReceptorRoleSignal PathwaySignal TransductionSkinStagingSurfaceSystemT-LymphocyteTechniquesTestingTherapeuticTherapeutic InterventionThymus GlandTissuesTrainingTransforming Growth Factor betaTretinoinVitamin AVitamin DVitaminsWorkcareerdifferential expressionexperienceimmunoregulationimprovedin vivolangerinlymph nodesmouse langerinmouse modelnew therapeutic targetnovel strategiespreventprogramsreceptorresearch studyresponseskin disordertooltranscription factor
项目摘要
PROJECT SUMMARY
Cutaneous immune responses must be tightly controlled to prevent inflammatory and allergic
diseases, i.e., atopic dermatitis, psoriasis, contact dermatitis, and pemphigus vulgaris. Foxp3+
regulatory T cells (T regs) play a critical role in skin immunoregulation. T regs can be naturally
generated in the thymus, or can be induced de novo from CD4+ naïve T cells in the periphery by
antigen presenting cells, especially dendritic cells (DCs). The DC system is intricate and is
comprised of distinct subsets such as, skin migratory Langerhans cells, skin migratory classical
dermal DCs and CD103+ dermal DCs, and tissueresident DCs. The relative role of each of these
subsets in inducing T regs has been until now indeterminate. Using a novel approach that consists
of directing antigens to different subsets of DCs in vivo using monoclonal antibodies against
surface receptors, we have found strong evidence that not all DCs have the ability to induce
regulatory T cells, but instead skin migratory DC excel in this function. This observation leads to my
hypothesis that these subsets of skin migratory DC are intrinsically programmed by a set of
transcriptional factors to induce this type of response. Additionally, local environmental/dietary
factors are also described to play a role in the generation of T regs. For instance, the vitamin A
active compound retinoic acid, working in conjunction with TGFβ, is known to have a positive
impact in the induction of T regs in the intestinal track. Similarly, there is ample evidence in vitro
suggesting that Vitamin D acts on DCs and/or T cells for generation of a tolerogenic phenotype.
The contribution of the proposed research is expected to be: 1) the identification of DCintrinsic
signaling pathways that program subsets of skin migratory DC to the induction of T regs, 2) the
determination of the role of Vitamins, acting on DCs and/or T cells in vivo, for the generation of T
regs, and 3) the evaluation of the suppressive activity of induced Tregs in a mouse model of atopic
dermatitis. We are prepared to undertake the proposed research since we have all the necessary
tools for studying DC functions in vivo, as well as, ample experience with DC subsets. With my
mentors, I have planned the aims to achieve a comprehensive training in molecular biology
approaches and mouse genetic engineering during the K99 phase of the award. This project is of
particular relevance because in most skin inflammatory diseases the number of T regs is altered,
qualitatively and/or quantitatively, suggesting their role in the pathophysiology of the illness. A
detailed comprehension of the mechanisms of DCmediated T reg induction will help to understand
the events that lead to the appearance of skin disease. Also, this knowledge is likely to be
beneficial to the development new therapeutic targets to increase T reg, which in turn will lead to
improved treatment of inflammatory skin diseases and their complications.
项目摘要
必须严格控制皮肤免疫反应,以防止炎症和过敏
疾病,即特应性皮炎、牛皮癣、接触性皮炎和寻常型天疱疮。 福克斯p3+
调节性 T 细胞 (T regs) 在皮肤免疫调节中发挥着至关重要的作用。 T 规则可以是自然的
在胸腺中产生,或者可以从外周的 CD4+ 幼稚 T 细胞中重新诱导
抗原呈递细胞,尤其是树突状细胞 (DC)。 DC 系统非常复杂,并且
由不同的子集组成,例如皮肤迁移朗格汉斯细胞、皮肤迁移经典细胞
真皮 DC 和 CD103+ 真皮 DC 以及组织驻留 DC。 这些的相对作用
迄今为止,诱导 T reg 的子集仍不确定。 使用一种新颖的方法,包括
使用单克隆抗体在体内将抗原引导至 DC 的不同子集
表面受体,我们发现强有力的证据表明并非所有 DC 都具有诱导
调节性 T 细胞,但皮肤迁移 DC 擅长此功能。 这个观察导致我的
假设皮肤迁移 DC 的这些子集本质上是由一组
转录因子诱导这种类型的反应。 此外,当地环境/饮食
还描述了一些因素在 T reg 的产生中发挥作用。 例如,维生素 A
活性化合物视黄酸与 TGFβ 联合作用,已知具有积极作用
对肠道 T 调节蛋白诱导的影响。 同样,有充足的体外证据
表明维生素 D 作用于 DC 和/或 T 细胞,产生耐受性表型。
拟议研究的贡献预计为:1) DCintrinsic 的识别
将皮肤迁移 DC 子集编程为 T 调节器诱导的信号通路,2)
确定维生素在体内作用于 DC 和/或 T 细胞以产生 T 的作用
regs,以及3) 特应性小鼠模型中诱导性Tregs 抑制活性的评估
皮炎。 我们已准备好进行拟议的研究,因为我们拥有所有必要的条件
研究 DC 体内功能的工具,以及丰富的 DC 子集经验。 与我的
导师们,我已经计划了目标,以实现分子生物学方面的全面培训
K99 奖项阶段的方法和小鼠基因工程。 该项目是
特别相关,因为在大多数皮肤炎症性疾病中,T reg 的数量发生了改变,
定性和/或定量,表明它们在疾病的病理生理学中的作用。 一个
详细理解 DC 介导的 T reg 诱导机制将有助于理解
导致皮肤病出现的事件。 此外,这些知识很可能是
有利于开发新的治疗目标以增加 Treg,进而导致
改善炎症性皮肤病及其并发症的治疗。
项目成果
期刊论文数量(0)
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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Juliana Idoyaga其他文献
Juliana Idoyaga的其他文献
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{{ truncateString('Juliana Idoyaga', 18)}}的其他基金
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