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関連する概念動画

Development of Immunocompetence01:22

Development of Immunocompetence

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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
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Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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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...
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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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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...
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Introduction to Innate and Adaptive Immunity01:21

Introduction to Innate and Adaptive Immunity

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The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
Innate immunity is the body's natural, nonspecific defense system that acts quickly to protect against pathogens. It incorporates physical barriers like skin and mucous membranes and cellular elements such as phagocytes and natural killer cells. This part of our immune system provides an immediate,...
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What is the Immune System?01:38

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Overview
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Functions of the Lymphatic and Immune System01:28

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The lymphatic system plays a crucial role in bolstering our immune system. It consists of a network of lymphoid organs, lymph, and lymphatic vessels that provide structural and functional support in safeguarding the body against pathogens such as viruses and bacteria.
The primary lymphoid organs, including the bone marrow and the thymus, serve as the maturation sites for lymphocytes. Secondary lymphoid organs, like the mucosa-associated lymphoid tissue, activate these lymphocytes and serve as...
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ヒトの免疫系が成熟するときに,全身の免疫活動が発生する.

Shuai He1, Chun-Ling Luo2, Tao Luo1

  • 1State Key Laboratory of Oncology in South China, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangdong Provincial Clinical Research Center for Cancer, Sun Yat-sen University Cancer Center, Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, P.R. China; Guangdong Provincial Key Laboratory of Organ Donation and Transplant Immunology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, P.R. China; Guangdong Provincial International Cooperation Base of Science and Technology (Organ Transplantation), The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, P.R. China.

Cell
|October 29, 2025
PubMed
まとめ

妊娠中 胎児の免疫細胞は活発で 広範囲に広がり 免疫機能が休眠状態にあるという 過去の考えに 異議を唱えます 研究者らは胎児の新種の耐性メカニズムと 免疫細胞の発達経路を発見しました

キーワード:
ARG1 についてPTGES3 PTGER4 についてT細胞受容体胎児の免疫造血幹細胞中性子妊娠3ヶ月目単細胞RNAシーケンシング組織内定の記憶T細胞

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科学分野:

  • 免疫学
  • 発達生物学
  • ゲノミクス

背景:

  • 第2 trimesterはヒトの免疫系の発達に不可欠です.
  • 過去の理解では 胎児の免疫静止状態と 限られた全身の活動が示唆されていました
  • 胎児におけるT細胞の発達と免疫耐性の役割については,さらなる解明が必要である.

研究 の 目的:

  • 免疫細胞の集団と,妊娠の第2 trimesterの間にその発展を包括的にプロファイリングする.
  • 胎児環境における免疫耐性のメカニズムを調査する.
  • 胎児における造血幹細胞 (HSC) の分布と分化の可能性を調査する.

主な方法:

  • 単細胞RNAシーケンシング (scRNA-seq) とT細胞受容体シーケンシング (TCR) が使用された.
  • 胎児と成人の臓器から採取した 321個の免疫細胞を分析した.
  • 細胞間通信分析と機能分析が行われました.

主要な成果:

  • ネイブT細胞成熟に関与する外血型CD4+T細胞のサブセットを特定する.
  • 臓器全体に広がった胎児記憶/活性化されたT細胞と 共有された組織内記憶クローンの発見は,全身の免疫活動を示唆している.
  • 2つの胎児の免疫耐性メカニズム:ARG1+中性子とPTGES3/PTGER4シグナル伝達経路を発見した.
  • 様々な臓器からの血球形成幹細胞 (HSC) の分散と分化が観察された.

結論:

  • 胎児の免疫システムは 静止状態のパラダイムとは対照的に 重要な組織的活動と複雑性を表しています
  • 胎児のT細胞発育と免疫耐性の新たな経路が特定されました.
  • 血液形成性幹細胞は胎児の発達において広範な分布と分化の可能性を示し,免疫系統の多様性に影響を与えます.