関連する実験動画
Updated: Mar 22, 2026

08:12
Identification of EGFR and RAS Inhibitors using Caenorhabditis elegans
Published on: October 5, 2020
3.4K
小分子RAS模倣剤は,RASとエフェクタタンパク質の結合を妨害し,シグナリングをブロックする
Sai Krishna Athuluri-Divakar1, Rodrigo Vasquez-Del Carpio1, Kaushik Dutta2
1Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, 1425 Madison Avenue, New York, NY 10029, USA; Department of Structural and Chemical Biology, Icahn School of Medicine at Mount Sinai, 1425 Madison Avenue, New York, NY 10029, USA.
Cell
|April 23, 2016
まとめ
新薬であるリゴセルチブは,RAS結合ドメイン (RBD) との相互作用を阻害することで,癌を誘発するRAS信号伝達を抑制する. この障害はRAS-RAF-MEKのような 重要な経路に影響を与え 様々な癌の治療戦略を 提供します
科学分野:
- 腫瘍学
- 分子生物学
- 薬物の発見
背景:
- RAS遺伝子変異はヒトの癌の20%から30%に共通する要因です.
- RAS腫瘍性タンパク質をターゲットにすることは,がん治療において重要な課題です.
- RASシグナリングは,RAS結合ドメイン (RBD) によるエフェクタタンパク質との相互作用に依存する.
研究 の 目的:
- RASシグナル伝達の潜在的阻害剤としてリゴサーチブを調査する.
- リゴサーチブがRASエフェクタ相互作用に影響を与えるメカニズムを決定する.
- 主要な腫瘍的経路を阻害するリゴサーチブの有効性を調べる
主な方法:
- ステリルベンジル硫黄を使用した in vitro 試験
- 効果タンパク質のRAS結合ドメイン (RBD) とのリゴサーチブの相互作用の分析
- RAS-RAF-MEKを含む下流信号経路の阻害の評価
主要な成果:
- RigosertibはRAFキナーゼのRBDに結合するRAS模倣剤として作用する.
- この結合はRAFとRASの相互作用を防止し,RAFの活性化とRAS-RAF-MEK経路を阻害する.
- リゴセルチブはRal- GDSとPI3KのRBDにも結合し,より広範な経路の阻害を示しています.
結論:
- Rigosertibは,RBDをターゲットにすることで,RASシグナル伝達を効果的に阻害します.
- この薬はRAS-RAF-MEK,Ral-GDS,PI3Kを含む複数の腫瘍信号伝達経路を妨害する.
- RASを標的としたリゴサーチブは,RAS誘発がんに対する有望な治療戦略です.
関連する概念動画
The Ras Gene
7.5K
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a...
Ras is a...
7.5K
Small GTPases - Ras and Rho
5.7K
Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
Three regulatory proteins control their activity:
5.7K
MAPK Signaling Cascades
9.1K
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
9.1K
Experimental RNAi
8.2K
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
8.2K
Interactions Between Signaling Pathways
7.8K
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...
7.8K
Receptor Tyrosine Kinases
20.5K
Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
20.5K

