リポカリン24p3の細胞表面受容体は,選択的にアポトーシスと鉄の吸収を媒介する
Laxminarayana R Devireddy1, Claude Gazin, Xiaochun Zhu
1Howard Hughes Medical Institute, Programs in Gene Function and Expression and Molecular Medicine, University of Massachusetts Medical School, Worcester, MA 01605, USA.
Cell
|December 27, 2005
まとめ
24p3受容体 (24p3R) は,細胞のアポトーシスと鉄のレベルを調節する. BCR-ABLオンコタンパク質は24p3Rを阻害するが,イマチニブはそれを回復させ,がん細胞のアポトーシスを誘発する.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- がん研究 がん研究
背景:
- マウスのリポカリン24p3タンパク質は,アポプトーシスと鉄の輸送に関与しています.
- 24p3 (24p3R) の細胞表面受容体は以前は特徴づけられていなかった.
研究 の 目的:
- 24p3細胞表面受容体 (24p3R) をクローンし,特徴づけること.
- 鉄輸送とアポトーシスにおける24p3Rの役割を調査する.
- 24p3R,BCR-ABLオンコタンパク質とイマチニブ治療の関係を探求する.
主な方法:
- 24p3R遺伝子のクローニング.
- 鉄の吸収とアポトーシスを評価するための細胞ベースの測定法.
- 24p3,鉄,BCR-ABL.に対する反応における遺伝子発現の分析.
- BCR-ABLを発現する細胞をイマチニブで治療する.
主要な成果:
- エクトピック24p3R発現により,細胞はリガンド鉄の含有量に基づいて鉄のレベルとアポトーシスを制御することができます.
- 鉄が充満した24p3は細胞内鉄を増やし,鉄が不足した24p3はビムとアポトーシスを誘発する.
- BCR-ABLは24p3を活性化し,24p3Rを抑制し,24p3.3に対する抵抗を引き起こす.
- イマチニブはBCR-ABLを阻害し,BCR-ABL ((+) 細胞における24p3R発現とアポトーシスを誘導する.
結論:
- 細胞内鉄調節は,新しいアポプトシス経路の重要な構成要素である.
- この経路は,BCR-ABL誘発の骨髄増殖性疾患に関連しています.
- 24p3Rを標的にすることは,BCR-ABLに関連したがんに対する潜在的な治療戦略を提供します.
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