
科研|诱导肠上皮内的CD4+CD8αα+T细胞 - 知乎 - 知乎专栏
在小肠上皮细胞中含有CD4+ CD8+ T细胞受体(TCR)αβ T细胞的特殊细胞群 [称为双阳性的上皮内淋巴细胞(DPIEL)。 DP IEL起源于固有层CD4+ T细胞,包括但不仅限于Treg;与Tregs互补发挥调节功能并促进对饮食抗原的耐受性。 当到达上皮时,这些细胞通过下调 Thpok 、上调 Runx3 和 T-bet 重新激活CD8+T细胞,该过程部分依赖于 转化生长因子-β (TGFβ), 维甲酸, 干扰素-γ (IFN-γ)和IL-27的作用。 无菌(GF)小鼠中缺乏DPIELs,表明肠道微生物群是其分化所需 …
CD8aa marks T cells that are distinct from the conventional thymus-selected and MHC-restricted CD4+ or CD8ab+ T cells. Inconsistent with a coreceptor function, CD8aa decreases antigen sensitivity of the TCR, and it can be transiently or permanently expressed on T cells, regardless of the MHC restriction of the
选择CD8抗体时,CD8和CD8α有啥区别吗? - 搜狐
2021年12月17日 · CD8的组成形式一般都是CD8αα和CD8αβ,却不存在CD8ββ的形式,因为CD8β的表达需要CD8α的辅助,故CD8α 可以形成同源二聚体,但CD8β不能。 大多数的人外周T细胞CD8均为αβ异二聚体,NK细胞和一部分TCRγδ T细胞的CD8为αα同源二聚体。 回到我们平常用到的CD8抗体,无论是否标着CD8α,绝大多数都是结合CD8αα的,因为你可以从NK和TCRγδ T细胞是否表达就知道了,所以选择抗体的时候,不需要太过担心。 但是话又说回来,当你需 …
CD8αα and CD8αβ: truly different?: Trends in Immunology - Cell …
2002年4月1日 · CD8 is a coreceptor of T cells for the recognition of peptide–MHC (pMHC) on antigen-presenting cells. It exists in two forms: an αα homodimer and an αβ heterodimer. The different functions of these two forms have long been a mystery, although it is believed that the heterodimer has a stronger affinity than the homodimer for pMHC.
CD8αα Expression Marks Terminally Differentiated Human …
2013年8月6日 · Using a combination of Thymic Leukemia (TL) antigen tetramer, which directly binds CD8αα, anti-CD161, and anti-Vα7.2 antibodies we have been able for the first time to clearly define CD8αα expression on human CD8 T cells subsets.
cd8_百度百科
CD8分子是MHCI类限制性T细胞识别抗原的辅助受体,能够与 MHCI类分子 结合而辅助TCR识别其递呈的抗原,并增强 T细胞 与 抗原提呈细胞 (APC)或 靶细胞 之间的相互作用。 [1] [3] CD8分子最重要的功能是参与 TCR 识别 抗原 所产生的活化信号的转导过程。 CD8分子的胞内部分能结合 酪氨酸蛋白激酶 p56 lck。 p56 lck 激活后,可催化 CD3 胞内部分的免疫受体酪氨酸激活基序 (ITAM)中的一个 酪氨酸 残基 磷酸化,并在细胞内引发 钙离子 流,从而将 TCR 识别 抗原 所 …
Trimodal single-cell profiling reveals a novel pediatric CD8αα
2023年10月16日 · Moreover, we discovered a novel CD8αα + T cell subset lost with age that is epigenetically poised for rapid effector responses and has distinct inhibitory, costimulatory and tissue-homing...
CD8αα intraepithelial lymphocytes arise from two main thymic …
2017年5月22日 · TCRαβ + CD4 − CD8α + CD8β − intestinal intraepithelial lymphocytes (CD8αα IELs) are an abundant population of thymus-derived T cells that protect the gut barrier surface. We sought to better define...
CD8αα Expression Marks Terminally Differentiated Human CD8+ T …
CD8α is a cell surface glycoprotein that can be expressed either as a disulfide-linked heterodimer together with CD8β or as a homodimer. In contrast to CD8αβ, CD8αα is never expressed on naïve T cells but readily induced on strongly activated T cells (1).
CD8αα⁺ innate-type lymphocytes in the intestinal ... - PubMed
2014年9月18日 · Innate immune responses are critical for mucosal immunity. Here we describe an innate lymphocyte population, iCD8α cells, characterized by expression of CD8α homodimers. iCD8α cells exhibit innate functional characteristics such as …