関連する実験動画
Updated: Jun 23, 2026

16:27
Strategies for Study of Neuroprotection from Cold-preconditioning
Published on: September 3, 2010
サイトカイン誘発信号ネットワークは,信号の強度よりもダイナミックレンジを優先します
Kevin A Janes1, H Christian Reinhardt, Michael B Yaffe
1Koch Institute for Integrative Cancer Research, Center for Cell Decision Processes, Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Cell
|October 30, 2008
まとめ
細胞の信号伝達経路は,信号の強度だけでなく,ダイナミックレンジを通じて情報を伝達します. このダイナミックレンジを理解することは,細胞アポトーシスを予測し,ネットワーク応答のシグナル伝達における壊滅的な障害を回避するために不可欠です.
科学分野:
- セルラー・シグナリング
- システム生物学 システム生物学
- アポトーシスの調節
背景:
- 信号ネットワークは刺激に反応しますが,下流の細胞応答への伝播は不明です.
- 細胞の運命を予測するには,信号状態がどのように伝達されるかを理解する必要があります.
研究 の 目的:
- 信号分子の漸進的な活性化が,信号の強さとダイナミックレンジに基づいてアポトーシスを制御する方法をモデル化するために.
- 信号伝達におけるダイナミックレンジの役割とその細胞応答への影響を特定する.
- 信号ネットワークの故障を分析するための計算技術を開発する.
主な方法:
- 信号ネットワークの活性化とアポトーシスの計算モデリング.
- 信号の入力・出力関係とダイナミックレンジの分析.
- 障害メカニズム調査のための"モデル・ブレイクポイント分析"の開発と適用.
- 特定されたキナーゼの役割の実験的検証.
主要な成果:
- 信号入力と応答出力の間の線形関係で,均一なダイナミックレンジ分布により,細胞アポトーシスが最もよく予測されます.
- 非線形化された信号と圧縮されたダイナミックレンジは,刺激特有の予測の失敗を招いた.
- モデル・ブレイクポイント分析では,アクト,ERK,MK2キナーゼの活性がアポトーシスにおける新しい時間および刺激特異的な役割を特定しました.
- ダイナミックレンジは,信号の強さよりも,細胞の運命を決定する潜在的に大きな要因として浮上した.
結論:
- ダイナミックレンジは,信号伝達と細胞運命を決定する際に重要な,しばしば見過ごされる要因です.
- モデル・ブレイクポイント分析は,シグナルメカニズムを解析し,重要な規制点を特定するための強力なツールです.
- ダイナミックレンジの理解は,さまざまな刺激に対する細胞反応の正確な予測に不可欠です.
関連する概念動画
Intracellular Signaling Cascades
Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
Intracellular Signaling Cascades
Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
Interactions Between Signaling Pathways
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Amplifying Signals via Enzymatic Cascade
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
Diversity in Cell Signaling Responses
The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity.
Graded and Abrupt Responses
Some signaling systems generate...
Graded and Abrupt Responses
Some signaling systems generate...
The JAK-STAT Signaling Pathway
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...

