一个表观遗传沉默通路控制T助手2细胞谱系的承诺
Rhys S Allan1, Elina Zueva, Florence Cammas
1Institut Curie Research Center, 26 rue d’Ulm, 75248 Paris Cedex 05, France.
Nature
|July 6, 2012
概括
SUV39H1H3K9me3HP1α通路通过沉默T辅助1 (TH1) 基因来维持T辅助2 (TH2) 细胞的稳定性. 这种途径的损失促进TH1反应,并加剧过敏性喘.
科学领域:
- 免疫学 免疫学 免疫学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 纯粹的CD4+T细胞分化为专门的T辅助 (TH) 子集 (TH1,TH2,TH17,Treg),这对免疫至关重要.
- 表观遗传机制调节TH细胞分化,但它们在血统稳定中的作用尚不清楚.
- SUV39H1H3K9me3HP1α通路参与通过异性染色素形成的转录沉默.
研究的目的:
- 研究SUV39H1H3K9me3HP1α通路在维持T助手2 (TH2) 谱系稳定性的作用.
- 确定这种途径是否会影响TH2细胞与其他细胞系的结合.
主要方法:
- 研究的TH2细胞缺少SUV39H1或HP1α.
- 评估了基因组修饰 (H3K9me3,H3K9ac) 和HP1α在TH1基因位置的结合.
- 在诱导分化条件下分析了TH1和TH2细胞的基因表达.
- 利用TH2驱动过敏喘的小鼠模型来评估体内相关性.
主要成果:
- SUV39H1 缺乏症会影响H3K9的三甲基化/乙化比,并降低TH2细胞中沉默的TH1基因促进体的HP1α结合.
- 在TH1诱导培养上,SUV39H1或HP1α缺乏TH2细胞异常表达TH1基因.
- 在体内,SUV39H1的抑制或丧失将T细胞的反应转移到TH1上,并减少过敏喘病理.
结论:
- SUV39H1H3K9me3HP1α通路对于通过表观遗传沉默TH1位点来维持TH2谱系稳定性至关重要.
- 这一途径代表了TH2细胞介导的炎症性疾病 (如过敏性喘) 的潜在治疗标.
相关概念视频
Lineage Commitment
Commitment is the process whereby stem cells:
T Cell Types and Functions
When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
T Cell Activation and Clonal Selection
T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
Naive T cells that have not yet encountered an antigen express two primary CD...
TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
B Cell Activation and Differentiation
The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
Epigenetic Regulation
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...

