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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...
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...
B Cell Activation and Differentiation01:24

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...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...

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Accessing Early Differentiation of Virus-Specific Follicular Helper CD4+ T Cell in Acute LCMV-Infected Mice
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CLV3p-FLS2シグナル伝達による幹細胞誘発免疫

Horim Lee1, Ok-Kyong Chah, Jen Sheen

  • 1Department of Molecular Biology and Center for Computational and Integrative Biology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, USA.

Nature
|April 19, 2011
PubMed
まとめ
この要約は機械生成です。

発芽アピカルメリスタム (SAM) の植物幹細胞は,先天的な免疫を持っています. CLAVATA3ペプチド (CLV3p) は,FLS2経由で病原体に対する耐性を活性化させ,植物の発達と防御における二重の役割を明らかにする.

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Generation of Multivirus-specific T Cells to Prevent/treat Viral Infections after Allogeneic Hematopoietic Stem Cell Transplant
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Expanding Cytotoxic T Lymphocytes from Umbilical Cord Blood that Target Cytomegalovirus, Epstein-Barr Virus, and Adenovirus
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科学分野:

  • 植物生物学 植物生物学
  • 分子遺伝学 分子遺伝学
  • 免疫学 免疫学とは

背景:

  • アピカルメリステム (SAM) 幹細胞を撃ち,植物器官を再生する.
  • SAM免疫は,病気のない植物の再生に不可欠ですが,十分に理解されていません.
  • CLAVATA3ペプチド (CLV3p) は,SAM幹細胞の恒常性を調節する.

研究 の 目的:

  • SAM免疫の基礎となる分子機構を調査する.
  • CLV3pが植物防御に作用するかどうかを判断する.
  • CLV3pと既知の免疫経路の相互作用を探求する.

主な方法:

  • アラビドプシス・タリアナ モデルシステム.
  • CLV3pシグナル伝達経路の分析.
  • FLS2受容体キナーゼの関与を調査した.
  • CLV1およびCLV2受容体の経路を研究した.

主要な成果:

  • CLV3pは,FLS2.2経由で免疫信号伝達と病原体抵抗を誘発する.
  • CLV3p-FLS2シグナリングは,CLV1/CLV2幹細胞経路とは独立しています.
  • このシグナリングは,FLS2媒介の成長抑制から切り離されている.
  • FLS2は,SAM内の内生的なCLV3pを感知し,自己/非自己の差別に挑戦します.

結論:

  • CLV3pは,植物の発達と免疫における二重の役割を担っています.
  • 植物ペプチドと受容体キナーゼのシグナル伝達が,発達と防衛のために共進化した.
  • 強化されたSAM免疫は,植物における不死性の維持のための戦略かもしれません.