関連する実験動画
Updated: Jun 21, 2026

06:32
Isolation, Enrichment, and Maintenance of Medulloblastoma Stem Cells
Published on: September 2, 2010
消化管腫瘍の成長におけるヘッジホッグ・リガンド刺激に対する広範な要求
David M Berman1, Sunil S Karhadkar, Anirban Maitra
1Department of Molecular Biology and Genetics and Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
Nature
|October 2, 2003
まとめ
エッジホッグ (Hh) 信号経路は,ゴーリン症候群とは異なり,多くの消化管がんの成長を促します. この経路をサイクロパミンなどのアンタゴニストで標的にすることは,これらの致命的な悪性腫瘍の治療に有望であることが示されています.
科学分野:
- 腫瘍学 腫瘍学
- 分子生物学は分子生物学である.
- 癌のシグナリング
背景:
- ヘッジホッグ (Hh) 信号伝達経路は,様々な組織における腫瘍発生に関与しています.
- ゴーリン症候群と散発的な突然変異は,Hhシグナル伝達を活性化し,特定のがんを引き起こす.
研究 の 目的:
- 消化管の腫瘍におけるHh経路活動の役割を調査する.
- これらのがんにおけるHh経路活性化のメカニズムを決定する.
- Hh経路阻害の治療の可能性を評価する.
主な方法:
- 多様な消化管腫瘍サンプルにおけるHh経路の活性分析.
- サイクロパミン (Hh経路の抗体) による治療 in vitro および in vivo.
- Hhリガンドトランスクリプトの検出 (ソニック・ヘッジホッグ,インド・ヘッジホッグ).
- Hh 中和化抗体と外因的なHh リガンド効果の評価.
主要な成果:
- Hh経路の活性が増加したのは食道,胃,胆道,臓の腫瘍では観察されたが,大腸がんでは観察されなかった.
- サイクロパミンは,腫瘍細胞の増殖をインビトロで抑制し,異種移植腫瘍のサイズをインビヴォで減少させた.
- これらの消化器がんにおけるHh経路の活性化は,突然変異ではなく,内生的なHhリガンド発現によって引き起こされる.
- Hhリガンド発現は,トランスクリプト分析と機能分析によって確認されました.
結論:
- ヘッジホッグのシグナル伝達経路は,一般的な消化道悪性腫瘍の重要なサブセットの成長の重要な原動力である.
- ゴーリン症候群で見られる変異とは異なり,Hh経路のリガンド依存活性化がこれらのがんの鍵です.
- サイクロパミンなどの薬剤を用いたHh経路の阻害は,これらの致死性がんに対する潜在的な治療戦略を表しています.
関連する概念動画
Hedgehog Signaling Pathway
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
Regulation of Angiogenesis and Blood Supply
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
Hedgehog Signaling Pathway
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
Cadherins in Tissue Organization
The cadherins are a superfamily of cell adhesion molecules comprising over 180 variants, with specific tissues expressing a particular combination of cadherin types. Cadherins generally exhibit homophilic binding; i.e., cadherins on one cell bind to cadherins of the same or closely related type on another cell. Thus, cells of the same type have a specific affinity to bind to each other and sort themselves into clusters to form tissues.
Cell Sorting During Development
Cell sorting plays an...
Cell Sorting During Development
Cell sorting plays an...
Role Of Notch Signalling In Intestinal Stem Cell Renewal
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...

