NF-kappaBは,炎症に関連したがんにおける腫瘍プロモーターとして機能する
Eli Pikarsky1, Rinnat M Porat, Ilan Stein
1Department of Pathology, Hadassah-Hebrew University Medical Center, Jerusalem 91120, Israel. peli@hadassah.org.il
Nature
|August 27, 2004
まとめ
慢性炎症は,がんの発症に寄与する. 核因子カッパB (NF-kappaB) の活性化は,炎症に関連した癌の進行に不可欠であり,予防のための潜在的な治療目標となっています.
科学分野:
- 腫瘍学 腫瘍学
- 免疫学 免疫学とは
- 肝臓病理学 肝臓病理学
背景:
- 慢性炎症はヒトがんの約20%に関連していますが,そのメカニズムは不明です.
- 核因子カッパB (NF-kappaB) の活性化は,腫瘍でしばしば見られる重要な炎症反応である.
- NF-kappaBが炎症とがんを結びつける役割については,さらなる解明が必要である.
研究 の 目的:
- 炎症に関連した肝細胞がんの発症におけるNF-kappaBの役割を調査する.
- NF-kappaBが慢性肝炎から肝がんへの進行における重要な媒介者かどうかを判断する.
主な方法:
- Mdr2-ノックアウトマウスを利用し,自発的なコレスタティック肝炎と肝細胞癌のモデルとなった.
- 肝炎と癌の進行をモニタリングし,腫瘍死滅因子アルファ (TNFalpha) によるNF-kappaBの活性化を評価した.
- NF-kappaBを阻害することで介入し,ヘパトサイト特異の誘導性イカッパB超抑制トランスゲンと,異なる疾患段階での抗TNFalpha治療を使用します.
主要な成果:
- 肝細胞におけるNF-kappaBの活性化は,TNFalpha.経由の炎症によって引き起こされた.
- 早期NF-kappaB抑制 (出生から7ヶ月) は,肝炎や早期の変異に影響を与えませんでした.
- 後期期のNF-kappaB抑制は,変形した肝細胞のアポトーシスにつながり,肝細胞がんの発症を予防しました.
結論:
- NF-kappaBは,炎症に関連したがんの進行に不可欠です.
- NF-kappaBを標的にすることは,慢性炎症性疾患におけるがん予防のための戦略を提供することができる.
- NF-kappaB阻害のタイミングは,腫瘍の進行を予防する治療効果にとって非常に重要です.
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