ケモカイン駆動のポジティブなフィードバック・ループがリンパ性毛皮を組織します
K M Ansel1, V N Ngo, P L Hyman
1Department of Microbiology and Immunology, University of California San Francisco, 94143, USA.
Nature
|August 5, 2000
まとめ
B-リンパ球化学吸引剤 (BLC) とその受容体CXCR5は,B細胞をリンパ節と臓の両方のリンパ性毛細部に誘導するのに不可欠です. この相互作用は,これらの重要な免疫構造の発達と維持に不可欠です.
科学分野:
- 免疫学 免疫学とは
- 細胞生物学 細胞生物学
- 発達生物学 発達生物学について
背景:
- リンパ卵泡は,免疫反応のためのB細胞の重要なコンパートメントです.
- CXCキモカイン受容体-5 (CXCR5) は,B細胞が胞の葉っぱに移動するのを媒介することが知られている.
- リンパ節B細胞領域へのB細胞のホーミングメカニズムについては,さらなる定義が必要である.
研究 の 目的:
- B-リンパ球化学吸引剤 (BLC) とCXCR5が,B細胞がリンパ節の卵泡に寄与する役割を解明する.
- リンパ性臓器の発達におけるBLCの機能を調査する.
- 卵泡のホメオスタシスに関与する規制的フィードバックループを理解するために.
主な方法:
- 遺伝子標的のマウスを利用して,B細胞ホーミングとリンパ性臓器の発達を研究した.
- BLCとCXCR5のシグナル伝達に反応するB細胞の移住パターンを分析した.
- B細胞におけるリンパ毒素α1β2の発現を調査した.
主要な成果:
- BLCとCXCR5は,B細胞がリンパ節と胞の両方に向くために不可欠です.
- BLCはリンパ節とペイヤー斑の発達に重要な役割を果たします.
- BLCはB細胞リンフォトキシンα1β2を誘導し,卵泡の発達と恒常性のためにポジティブなフィードバックループを作成します.
結論:
- BLCとCXCR5は,リンパ性卵泡内のB細胞の局所化に不可欠です.
- BLC媒介のポジティブなフィードバックループは,卵泡の構造と機能を維持するために不可欠です.
- これらのメカニズムを理解することで,免疫システムの発達と調節に関する洞察が得られます.
関連する概念動画
Positive and Negative Feedback Loops
Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires maintaining an internal dynamic equilibrium:
Cell Signaling Feedback Loops
Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
Lymphoid Cells and Tissues
Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
Lymphoid cells consist of various types of immune system cells. These include B and T lymphocytes, which are responsible for producing antibodies and killing infected cells, respectively. Dendritic cells act as messengers between the innate and adaptive...
Lymphoid cells consist of various types of immune system cells. These include B and T lymphocytes, which are responsible for producing antibodies and killing infected cells, respectively. Dendritic cells act as messengers between the innate and adaptive...
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 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...
Naive T cells that have not yet encountered an antigen express two primary CD...
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...
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...


