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相关概念视频

cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
Immunoglobulin-like Cell Adhesion Molecules01:31

Immunoglobulin-like Cell Adhesion Molecules

Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
T Cell Activation and Clonal Selection01:22

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...
Immunological Memory01:23

Immunological Memory

Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature is...

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Imaging Effector Memory T cells in the Ear After Induction of Adoptive DTH
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在T细胞记忆中对CaMKII的作用.

J D Bui1, S Calbo, K Hayden-Martinez

  • 1Department of Biology and Cancer Center, University of California, San Diego, La Jolla 92093-0687, USA.

Cell
|February 29, 2000
PubMed
概括

/卡尔莫杜林酶II (CaMKII) 在T细胞分化中起着关键作用. 转基因小鼠显示,CaMKII影响T细胞记忆形成和胸细胞存活,影响适应性免疫力.

科学领域:

  • 免疫学 免疫学 免疫学
  • 分子生物学分子生物学
  • 细胞生物学 细胞生物学

背景情况:

  • /卡尔莫杜林酶II (CaMKII) 对于T细胞功能至关重要.
  • 了解CaMKII在T细胞激活和分化中的作用对于免疫学至关重要.
  • 之前的研究已将CaMKII与各种细胞过程相关联,但它在T细胞记忆发育中的特定作用需要进一步阐明.

研究的目的:

  • 研究/卡尔莫杜林激酶II (CaMKII) 在T细胞分化和记忆形成中的作用.
  • 分析部分不依赖的CaMKII突变体对胸细胞发育和T细胞群的影响.

主要方法:

  • 产生表达CaMKIIgammaB (T287D) 的部分独立突变的转基因小鼠.
  • 胸腺大小和胸细胞群的分析 (双阳性,DP).
  • 用各种标准评估二级淋巴体器官中T细胞记忆表型.
  • 在抗原刺激分裂后,在野生型T细胞中评估CaMKII活性.

主要成果:

  • 转基因小鼠的胸腺大小增加了1.5到2倍,这与增强的双阳性 (DP) 胸细胞寿命有关.
  • 在二级淋巴体器官中观察到抗原依赖的T细胞记忆表型的显著增加.
  • 野生型T细胞在多轮抗原刺激分裂后获得了不依赖的CaMKII活性.

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  • 这些发现表明,CAMKII参与产生真实的记忆T细胞.

    • 结论:

    • CaMKII是T细胞分化的关键调节者,特别是在获得记忆表型时.
    • 在T细胞激活和分裂后,CaMKII活动可以变得独立于,从而有助于记忆细胞的形成.
    • 这项研究提出,CaMKII控制了T细胞中激活诱导的细胞分化的独特途径.