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In-vitro Mutagenesis01:16

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To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
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Mice have long served as models for studying human biology and pathology because of their phylogenetic and physiological similarity with humans. They are also easy to maintain and breed in the laboratory, and hence, many inbred strains are now available for research. Studies on mice have contributed immeasurably to our understanding of cancer biology.
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Antigens Involved in Adaptive Immunity01:26

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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
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MHCクラスIIの分子が欠けているマウスは

D Cosgrove1, D Gray, A Dierich

  • 1Laboratoire de Génétique Moléculaire des Eucaryotes du CNRS, Unité 184 de Biologie Moléculaire de Génie Génétique de l'INSERM, Faculté de Médecine, Strasbourg, France.

Cell
|September 6, 1991
PubMed
まとめ
この要約は機械生成です。

主要ヒストコンパティビリティ複合体II級分子が欠けているマウスは,CD4+T細胞の減少とB細胞の反応の低下を示し,いくつかの役割を確認するが,リンパ球の微分化の新しい側面を明らかにする.

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科学分野:

  • 免疫学 免疫学とは
  • 分子生物学は分子生物学である.
  • 遺伝学 遺伝学とは

背景:

  • メジャー・ヒストコンパティビリティ・コンプレックス (MHC) クラスIIの分子は,T細胞の活性化と免疫反応に不可欠です.
  • T細胞とB細胞の分化におけるMHCクラスIIの正確な役割を理解することは,免疫学にとって不可欠です.

研究 の 目的:

  • 遺伝子組み換えマウスを用いてTおよびBリンパ球の分化におけるMHCクラスIIの分子機能を調査する.
  • 免疫細胞集団と機能に対するMHCクラスII欠乏症の影響を明らかにする.

主な方法:

  • MHCクラスII抗原が欠けている遺伝子組み換えマウスの生成.
  • ,リンパ節,胸腺におけるTおよびBリンパ球集団のフローサイトメトリー分析.
  • B細胞の分化と抗体生成の評価.

主要な成果:

  • 周辺リンパ性臓器からCD4+Tリンパ球がほぼ完全に除去される.
  • 甲状腺にCD4単一陽性細胞が存在するが,成熟した甲状腺細胞ではない.
  • 正常なB細胞数とプラズマ細胞への微分化ですが,生殖中心が欠落し,IgG1の生産が低下したなどの異常があります.
  • T依存抗原に対する完全な無反応.

結論:

  • MHCクラスII分子は,周辺組織におけるCD4+T細胞の発達および/または維持に不可欠である.
  • B細胞は,MHCクラスII欠乏症のマウスで分化することができるが,その機能は,特にT依存反応において,著しく低下している.
  • これらの発見は,MHCクラスIIの既定の役割を確認しますが,リンパ球の発達と免疫におけるMHCクラスIIの欠如の予期せぬ結果を強調しています.