Regulation of memory T cell trafficking by core 2 O-glycan synthesis

项目总结/摘要 抗原经历的记忆T细胞构成免疫细胞的多样性、异质性群体， 在整个生命过程中产生的各种病原体，疫苗，过敏原，自身抗原和其他 环境因素事实上，随着年龄的增长，新的幼稚T细胞的产生减少，记忆T细胞减少。 人口占主导地位的剧目。因此，调节各种功能的基本机制 记忆T细胞群与多种疾病和病理状况具有广泛的相关性， 疫苗设计、免疫治疗方案以及炎症或自身免疫性疾病的治疗或预防 紊乱虽然在循环中记忆性CD 8+和CD 4 + T细胞的形成和分化具有一定的生物学意义， 已经被广泛表征，记忆T细胞主动归巢和浸润组织的能力， 它们表现出的效应子功能还不太清楚。我们最近发现记忆性CD 8 + T细胞 需要选择素配体的翻译后O-连接的糖基化，用于运输到和浸润非 淋巴组织此外，我们确定了核心2 O-聚糖的从头合成仅限于 记忆性T细胞，并且可以以抗原非依赖性方式调节。然而，基本的分子 调节记忆性CD 8+和CD 4 + T细胞核心2 O-聚糖合成和运输的机制 感染的特征尚待充分确定。具体来说，我们将1）确定不同的CD 8 + T细胞群是否 有能力合成核心2 O-聚糖并运输到非淋巴组织中，2）定义分子 和调节记忆性CD 8 + T细胞中核心2 O-聚糖合成的转录机制，和3） 确定记忆性CD 4 + T细胞是否需要核心2 O-聚糖合成，以运输到非淋巴组织中， 急性或慢性病毒感染。因此，我们研究的总体目标将是识别和表征 调节不同记忆T细胞群的运输机制以及如何增强这种机制 (for宿主保护）或抑制（用于过敏或自身免疫）。

PROJECT SUMMARY/ABSTRACT Antigen-experienced memory T cells constitute a diverse, heterogeneous population of immune cells that is generated throughout life in response to a variety of pathogens, vaccines, allergens, self-antigens and other environment factors. In fact, as we age, generation of new naïve T cells diminishes and memory T cell populations dominate the repertoire. Thus, the basic mechanisms that regulate the functions of diverse memory T cell populations has broad relevance for a variety of diseases and pathological conditions including vaccine designs, immunotherapy protocols and treatment or prevention of inflammatory or autoimmune disorders. Although the formation and differentiation of memory CD8+ and CD4+ T cells in the circulation has been extensively characterized, the capacity for memory T cells to actively home to and infiltrate tissues where they exhibit their effector functions is less understood. We have recently discovered that memory CD8+ T cells require post-translational O-linked glycosylation of selectin ligands for trafficking to and infiltrating non- lymphoid tissues. Furthermore, we identified that de novo synthesis of core 2 O-glycans is restricted to memory T cells and can be regulated in an antigen-independent manner. However, the basic molecular mechanisms regulating core 2 O-glycan synthesis and trafficking of memory CD8+ and CD4+ T cells during infections are yet to be fully characterized. Specifically, we will 1) determine if different CD8+ T cell populations have the capacity to synthesize core 2 O-glycans and traffic into non-lymphoid tissues, 2) define the molecular and transcriptional mechanisms that regulate core 2 O-glycan synthesis in memory CD8+ T cells, and 3) determine if memory CD4+ T cells require core 2 O-glycan synthesis to traffic into non-lymphoid tissues during either acute or chronic viral infections. Thus, the overall goal of our study will be to identify and characterize the mechanisms regulating the trafficking of diverse memory T cell populations and how this can be enhanced (for host protection) or inhibited (for allergies or autoimmunity).