The Role of CD4+ Memory T cell Subtypes in Periodontal Disease Recurrence

项目摘要 牙周病(PD)的复发是一种免疫学或治疗靶向性很差的疾病。 临床挑战。揭示长期免疫细胞的动态平衡和致病潜力 牙周组织对于揭示帕金森病复发的细胞驱动因素至关重要。这项提案的重点是 一种被忽视的与牙周相关的细胞室，即CD4+T记忆细胞(TM)，它很容易 识别微生物抗原，以便快速而有力地做出反应。为此，我们将使用一个新的 特征性复发性帕金森病小鼠模型和一种牙周T细胞浓缩方法。在这个模型中， 时间是识别疾病开始、消退和复发的关键变量。通过建立这一点 模型中，我们将能够定义“恢复的”基线，而不是“健康的”基线状态，这更多 临床上很准确。此外，它还允许定义多个复发发作如何逐渐影响复杂性 与周期相关的免疫网络。初步研究表明，CD_4~+T细胞在 由于不断增加的环境抗原暴露，出生后不久就会出现牙龈。当小鼠完全康复的时候 在结扎诱导的帕金森病中，帕金森病复发期间骨丢失速度加快。最耐人寻味的是，CD4+TM 帕金森病复发时，牙周组织中的亚型较丰富。牙周CD4+组织驻留记忆细胞 抑制外周血T细胞浸润所致的骨丢失。基于这些发现，我们将测试 帕金森病诱导的CD4+TM亚型的产生和持久性决定帕金森病的假说 复发。因此，通过抑制代谢检查点来定向消耗这些细胞将会增强 免疫调节反应，抑制帕金森病复发。有三个相互联系但又相互独立的 目的：1)研究牙周组织中CD4+TM细胞的时空发育。在这里， 重点将放在了解CD4+TM细胞的构成和病理生成上，以确定 它们在牙床免疫系统中的作用。2)阐明PD诱导的CD_4~+T细胞致病性。在这里，我们 将评估哪些CD4+TM亚型在术后保留了促炎和破骨细胞编程 警察。我们将对CD4+TM亚型进行转录转录比较，并用EX评估结果 体内功能检测，以验证其致病潜力。3)制定针对CD4+的干预策略 TM耗竭，以防止PD复发。在这里，我们将采用基于新陈代谢的策略来选择性地 清除帕金森病诱导的CD4+TM，加强调节性T细胞的浓缩，以防止帕金森病复发。这个 独立奖(PAR-22-041)将促进我的独立研究成长，并使我能够完成 我的长期职业目标是成为一名多产的独立牙周学和翻译科学家 相关领域主要关注慢性病的复发。

Project Summary The recurrence of periodontal disease (PD) is a poorly immunologically defined or therapeutically targeted clinical challenge. Uncovering the homeostatic and pathogenic potential of long-term immune cells in periodontal tissues is crucial to revealing the cellular drivers of PD recurrence. This proposal focuses on an overlooked periodontal-associated cellular compartment, CD4+ T memory cells (TM), which can readily recognize microbial antigens for a quick and robust response. For this purpose, we will utilize a newly characterized murine model of recurrent PD and a method for gingival T-cell enrichment. In this model, time is a critical variable for recognizing disease initiation, resolution, and recurrence. By establishing this model, we will be able to define a “recovered” baseline instead of a “healthy” baseline state, which is more clinically accurate. Also, it allows defining how multiple relapse episodes incrementally impact the complex periodontally-associated immune network. The preliminary studies revealed that CD4+ TM developed in the gingiva soon after birth due to increasing environmental antigenic exposure. While the mice fully recovered from ligature-induced PD, the bone loss rate accelerated during PD recurrence. Most intriguingly, CD4+ TM subtypes are enriched in the gingiva during PD recurrence. Gingival CD4+ tissue-resident memory cells induced bone loss when circulating T cell infiltration was inhibited. Based on these findings, we will test the hypothesis that the PD-induced generation and persistence of CD4+ TM subtypes determine PD recurrence. Thus, targeted depletion of these cells by inhibiting metabolic checkpoints will enhance immune-regulatory responses and inhibit PD recurrence. There are three interconnected but independent Aims: 1) To identify the spatiotemporal development of CD4+ TM cells in periodontal tissues. Here, the focus will be on understanding the constitutive and pathologic generation of CD4+ TM cells to determine their roles in the gingival immune landscape. 2) To elucidate PD-induced CD4+ TM pathogenicity. Here, we will evaluate which CD4+ TM subtypes retain pro-inflammatory and osteoclastogenic programming after PD. We will make transcriptomic comparisons between CD4+ TM subtypes and assess the findings with ex vivo functional assays to validate their pathogenic potential. 3) To develop an intervention strategy for CD4+ TM depletion to prevent PD recurrence. Here, we will employ a metabolic-based strategy to selectively deplete PD-induced CD4+ TM and enhance regulatory T cells enrichment to prevent PD recurrence. The independence award (PAR-22-041) will foster my independent research growth and allow me to accomplish my long-term career goal to become a productive, independent translational scientist in periodontology and related fields focused on chronic diseases’ recurrence.