早期のT細胞系統のコミットメントチェックポイントは,転写因子Bcl11bbに依存する
Long Li1, Mark Leid, Ellen V Rothenberg
1Division of Biology 156-29, California Institute of Technology, Pasadena, CA 91125, USA.
まとめ
亜鉛指の転写因子Bcl11bは,Tリンパ球の系統のコミットメントに不可欠です. この転写因子は,自然殺人細胞の潜在能力を抑制し,T細胞発達の過程で幹細胞遺伝子を静止するために不可欠です.
科学分野:
- ヘマトポエーシス (血液形成) とは
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
背景:
- Tリンパ球系統への血液形成前駆体結合の調節体は,依然としてほとんど不明である.
- T系統へのコミットメントには,代替的な細胞運命を抑制すること (自然殺菌体,骨髄体,樹状体) と幹細胞の自己再生機能が含まれます.
研究 の 目的:
- Tリンパ球系統に関与する規制者を特定する.
- T細胞発達の重要な段階におけるBcl11bの役割を明らかにする.
主な方法:
- 血液形成細胞におけるBcl11bの発現パターンを研究した.
- マウスモデルを使用して,T系統へのコミットメントのためにBcl11bの必要性を評価しました.
- Bcl11bを操作した際の自然殺虫剤と幹細胞機能に関連する遺伝子発現の変化を分析した.
主要な成果:
- Bcl11bは,T細胞特異の転写因子で,系統結合直前に発現する.
- Bcl11bは,マウスのT系統へのコミットメントに不可欠です.
- Bcl11bは,天然キラー細胞に関連した遺伝子を積極的に抑制する.
- Bcl11bは,コミットメント中に幹細胞および前祖細胞の調節遺伝子をダウンレギュレーションします.
結論:
- Bcl11bは,Tリンパ球の系統のコミットメントを媒介する重要なレギュレータです.
- Bcl11bは,他の細胞の潜在能力を抑制し,コミットメントの段階での祖先細胞の特徴を静止することによって機能します.
関連する概念動画
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...
Lineage Commitment
Commitment is the process whereby stem cells:
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 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...
The Intrinsic Apoptotic Pathway
Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...


